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- Creator:
- McCuen, Brett A.
- Description:
- We present a comprehensive statistical analysis of high-frequency transient-large-amplitude (TLA) magnetic perturbation events that occurred at 12 high-latitude ground magnetometer stations throughout solar cycle 24 from 2009 to 2019. TLA signatures are defined as one or more second-timescale dB/dt interval with magnitude ≥ 6 nT/s within an hour event window. This study characterizes high-frequency TLA events based on their spatial and temporal behavior as well as relation to auroral substorms, geomagnetic storm phases and nighttime geomagnetic disturbance events events (GMD). We show that TLA events occur primarily at nighttime and solely in the high-latitude region above 60 degrees geomagnetic latitude. The largest TLA events occurred more often in the declining phase of the solar cycle when solar wind velocity was higher and ring current activity was lower, suggesting association to high-speed flows caused by coronal holes and subsequent corotating interaction regions reaching Earth. TLA perturbations often occurred preceding or within the most extreme nighttime geomagnetic disturbance (GMD) events with 5-10 minute timescales, but the TLA intervals were often even more localized than the ~300 km effective radius of GMDs: occurring at only some of the stations at which GMDs occurred. We show that TLA-related GMD events can result from dipolarization fronts in the magnetotail and fast flows toward Earth and are closely temporally associated to poleward boundary intensifications (PBI) and auroral streamers. The highly localized behavior and connection to the most extreme GMD events suggests that TLA intervals are a ground manifestation of the features within rapid and complex ionospheric structures that can drive GICs.
- Keyword:
- geomagnetic field, high frequency, space weather, transient-large-amplitude, TLA, high frequency dB/dt, dB/dt search algorithm
- Citation to related publication:
- McCuen, B. A., Moldwin, M. B., Engebretson, M. J., Weygand, J. G., Nishimura, Y. (2023). A Statistical Analysis of High-frequency Transient-Large-Amplitude Geomagnetic Disturbance. [To be submitted to] Journal of Geophysical Research: Space Physics
- Discipline:
- Science
-
- Creator:
- Zhang, Yingxiao MI and Steiner, Allison MI
- Description:
- Atmospheric aerosols are emitted from both natural and anthropogenic sources, and they play an important role in climate, impacting solar radiation and cloud formation. Compared to other types of aerosol particles, primary biological aerosol particles (PBAP, e.g., fungal spores, bacteria, pollen, virus, etc.) are relatively understudied. However, they are linked to adverse health effects and have the potential to influence ice nucleation at higher temperatures. Anemophilous (or wind-driven) pollen is one of the important PBAP, impacts cloud properties under some conditions, and triggers allergic diseases such as allergic rhinitis (also known as hay fever) and asthma. Because pollen emission is closely associated with environmental drivers, the climatic change could influence pollen emission and consequently the incidence of allergic disease. Using CMIP6 model data, our research projects continental-scale changes in pollen emissions at the end of the century, considering the effects of temperature, precipitation, CO2, and future vegetation distribution change. While prior studies have evaluated single types of pollen, we use a mechanistic model to comprehensively simulate total pollen across the United States from all sources. Similar to previous single-source pollen studies, our simulations suggest that pollen season duration will lengthen, and pollen emission will increase in the future, but in addition, we identify new synergies between different pollen types that can influence the maximum daily pollen. Our work highlights that the changes of overlap between pollen seasons of different vegetation taxa can magnify or mitigate the impacts of climate change, which addresses the importance to study all pollen emissions comprehensively. Given pollen is one of the most common triggers of seasonal allergies, our findings also provide information to evaluate global health conditions in the future. In this study, all of the pollen emission data are written in NetCDF files.
- Keyword:
- Pollen emission change, Climate change, Public health, Vegetation land cover change, and CO2 effects
- Citation to related publication:
- Zhang, Y. and Steiner, A. “Projected climate-driven changes in pollen emission season length and magnitude over the continental United States”, under review in Nature Communication, 2022. and yingxz. (2022). steiner-lab/pecm: PECM2.0 (2.0). Zenodo. https://doi.org/10.5281/zenodo.5874177
- Discipline:
- Science
-
- Creator:
- Vani Archaeological Survey
- Description:
- The site of Sakakile (“Place of Beads”) lies 3 km upstream of the village of Sulori, on and around a small promontory on the left bank of the river, formed by a bend in the river and oriented southwest-northeast. This low and level promontory must always have made for a convenient crossing place, and there is now a log bridge running from the right bank of the river to the downstream end of the promontory. South of the promontory is a hill oriented east west from which much of the pottery found on the promontory appears to have eroded. The region around the river crossing is divided topographically into three distinct areas: Kvabiskari (“Place of the Cave/Gorge”), located downstream of the crossing and on the right (north) bank of the river; Sakakile, located on the promontory upstream of the crossing and on the left (south) bank of the river; and Likheti, located upstream of and uphill from Sakakile. Luka Dvalishvili, a resident of Sulori and the owner of the plot of land on the promontory, found a hoard of approximately 700 coins (including a silver Croesid) at Sakakile in the 1970s. At more or less the same time, another local farmer named Generi Paikidze found a bronze axe head here as well. After these chance finds, the Vani excavation team opened up two trenches on northern slope of the hill south of the river, where it slopes down to the low, level promontory of Sakakile. The excavations revealed a mixed assemblage of ceramics eroded from the hill south of the promontory, dating from the 8th-1st century B.C. (Iron Age, Classical, and Hellenistic). The only in-situ pottery assemblage was excavated on the hilltop and dates to the 6th-4th century B.C. Northeast of the hill, in the area where the bronze axe head was supposedly found (dated to the 7th century B.C.), the cobblestone foundation of an apsidal structure was excavated, along with clay tiles and metal implements. The excavation report concludes that occupation on the site began in the 7th-6th century, while the period of most intensive development was the 5th-4th century B.C. We recorded the locations of two trenches from the previous excavations and collected pottery from the eroding northern slope of the hill that forms the southern boundary of the promontory.
- Keyword:
- Iron Age, Late Hellenistic, Hoard, Settlement, and Stray Find
- Citation to related publication:
- In 1984, a chance find of a bronze axe was reported from the area known as Sakakile. In the following year, the Vani excavation team began excavations on the northern slope of the hill south of the river. In 1990 a hoard of 607 coins was found in the village of Sulori. A brief survey of the are was conducted in 2008., Lordkipanidze, O. 1986. Argonavtika da dzveli kolkheti [Argonautics and ancient Colchis]. Tbilisi. pp. 82-83. (In Georgian.), Lordkipanidze, O. D., R. V. Puturidze, D. D. Kacharava, V. A Tolordava, M. S. Pirtskhalava, A. M Chqonia, N. N. Matiashvili, D. V. Akhvlediani, G. Sh. Naridze, and G. A. Inauri. 1987. Raboty Vanskoi ekspeditsii [Work of the Vani archaeological expedition]. Polevye arkheologicheskiye issledovaniya v 1984-85 godakh [Field archaeological investigations in 1984-85]. Tbilisi. pp. 54-55. (In Russian.), Inauri, G. 1990a. Arkheologicheskiye razvedki v s. Sulori [Archaeological explorations in the village of Sulori]. Prichernomorye v VII-V vv. do n. e. Pismennye istochniki i arkheologiya. Materialy V Mezhdunarodnogo simpoziuma po drevnei istorii Prichernomorya. Vani – 1987 [The Black Sea littoral in the 7th-5th centuries B.C. Literary sources and archaeology (Problem of authenticity). Materials of the 5th International symposium dedicated to the problems of the ancient history of the Black Sea littoral. Vani – 1987]. Tbilisi. pp. 276-279. (In Russian.), Inauri, G. 1990b. Le territoire de Vani. Un compte rendu des recherches archéologiques. Le Pont-Euxin vu par les grecs. Sources écrites et archéologique. Symposium de Vani (Colchide), Septembre-Octobre 1987, Otar Lordkipanidze et Pierre Lévêque, ed. Tea Khartchilava et Evelyne Geny. Centre de Recherches d’Histoire Ancienne, Vol. 100. Paris: Annales Littéraires de l’Université de Besançon. pp. 249-252. (In French.), Lébanidzé, L. 1999. Le trésor monétaire de Sulori. La Mer Noire zone de contacts. Actes du VIIe Sympsium de Vani (Colchide) – 26-30.IX.1994. Paris. p. 155-158., Lordkipanidze, Otar. 2002. Dzeli kartuli civilizaciis sataveebtan [The sources of ancient Georgian civilization]. Tbilisi. pp. 206-7. (In Georgian.), and Kharabadze, S. 2008. “Vanis Qveq’nis” Arqeologiuri Ruk’a (dzv.ts. VIII – akh.ts. III ss.). (Archaeological Map of the Vani Land, 8th Century BC – 3rd Century AD). Tsardgenilia Doqt’oris Ak’ademiuri Khariskhis Mosap’oveblad. Saqartvelos T’eqnik’uri Universit’et’i. Tbilisi, 0175, Saqartvelo. Seqt’emberi. p. 20. (In Georgian with an English summary.)
- Discipline:
- Science and Humanities
-
- Creator:
- Bradshaw, Lisa, Vernon, Julianne, Schmidt, Thomas, James, Timothy, Zhang, Jianzhi, Archbold, Hilary, Cadigan, Ken, Wolfe, John P., and Goldberg, Deborah E.
- Description:
- This is the experimental data referenced in our manuscript entitled "Influence of CUREs on STEM retention depends on demographic identities." The dataset comprises csv files with results from student surveys given to students enrolled in Biology 173 from Fall 2015 through Fall 2019 as well as institutional data of their course grades and cumulative GPA at the time they enrolled in Biology 173, and graduation and major data for student who had graduated by 2021. The survey questions used in the analysis and the IRB consent form are also included as pdfs.
- Keyword:
- undergraduate research, STEM retention, CURE, introductory biology laboratory, and education research
- Citation to related publication:
- Bradshaw, L., Vernon J., Schmidt T., James T., Zhang J., Archbold H., Cadigan K., Wolfe J.P. & Goldberg D. 2023. Research article: Influence of CUREs on STEM retention depends on demographic identities. J Microbiol Biol Educ (accepted)
- Discipline:
- Science
-
- Creator:
- Salaree, Amir, Spica, Zack, and Huang, Yihe
- Description:
- The items in this bundle are supporting videos to a study of subsea seismo-acoustics carried out regarding an earthquake in the Persian Gulf. The main data used in the study is a diver's recording of the acoustic waves from the earthquake. The epicenter and topography data used in this study are publicly available as cited in the README.txt file.
- Keyword:
- Seismo-acoustics, Persian Gulf, Divers’ Microphones, Seismic Hazard, Early Warning
- Discipline:
- Science
-
- Creator:
- Limon, Garrett C.
- Description:
- The work guides the processing of CAM6 data for use in machine learning applications. We also provide workflow scripts for training both random forests and neural networks to emulate physic s schemes from the data, as well as analysis scripts written in both Python and NCL in order to process our results.
- Keyword:
- Machine Learning, Climate Modeling, and Physics Emulation
- Citation to related publication:
- Limon, G. C., Jablonowski, C. (2022) Probing the Skill of Random Forest Emulators for Physical Parameterizations via a Hierarchy of Simple CAM6 Configurations [Pre Print]. ESSOAr. https://10.1002/essoar.10512353.1
- Discipline:
- Engineering and Science
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Resources for Training Machine Learning Algorithms Using CAM6 Simple Physics Packages
User Collection
- Creator:
- Limon, Garrett
- Description:
- The collection contains the code and the data used to train machine learning algorithms to emulate simplified physical parameterizations within the Community Atmosphere Model (CAM6). CAM6 is the atmospheric general circulation model (GCM) within the Community Earth System Model (CESM) framework, developed by the National Center for Atmospheric Research (NCAR). GCMs are made up of a dynamical core, responsible for the geophysical fluid flow calculations, and physical parameterization schemes, which estimate various unresolved processes. Simple physics schemes were used to train both random forests and neural networks in the interest of exploring the feasibility of machine learning techniques being used in conjunction with the dynamical core for improved efficiency of future climate and weather models. The results of the research show that various physical forcing tendencies and precipitation rates can be effectively emulated by the machine learning models.
- Keyword:
- Machine Learning, Climate Modeling, and Physics Emulators
- Discipline:
- Science and Engineering
2Works -
- Creator:
- Limon, Garrett C.
- Description:
- The data represents weekly output from three 60-year CAM6 model runs. The output includes state (.h0. files) and tendency (.h1. files) fields for three difference model configurations of increasing complexity. State fields include temperature, surface pressure, specific humidity, among others; while tendencies include temperature tendencies, specific humidity tendencies, as well as precipitation rates. Using the state variables at a given time step, machine learning techniques can be trained to predict the following tendency field, which can then be applied to the state variables to provide the state at the next physics time step of the model.
- Keyword:
- Machine Learning, Climate Modeling, and Physics Emulation
- Citation to related publication:
- Limon, G. C., Jablonowski, C. (2022) Probing the Skill of Random Forest Emulators for Physical Parameterizations via a Hierarchy of Simple CAM6 Configurations [Preprint]. ESSOAr. https://10.1002/essoar.10512353.1
- Discipline:
- Engineering and Science
-
Realm 3: Tumulus Excavations
User Collection
- Creator:
- Galaty, Michael
- Description:
- The PASH Data Collection is comprised of Five data “realms”: 1) Survey and site data, 2) Settlement excavations, 3) Tumulus (burial mound) survey and excavations, 4) Artifact analysis, and 5) Geological data. All databases, field notebooks, unit and profile drawings, photographs, photo descriptions, radiocarbon dates, and geophysical survey data related to the tumuli excavations have been made available in PASH Deep Blue Data Realm 3., Total size of all files: approximately 2 gigabytes Chapter(s) linked to: Eight Abbreviations: “T” = tumulus, as in T099; “S” = site, as in S006, The excavation methods employed by PASH at tumuli replicate those employed at settlements. Natural stratigraphy was followed where possible, and arbitrary stratigraphic levels were defined when necessary. Arbitrary stratigraphic levels at tumuli often exceeded the 10 cm interval used at settlements, due to the large number of large rocks that needed to be removed. Due to the numerous rocks, not all mound fill was screened; rather, we screened every third bucket through quarter-inch mesh. By contrast, all soil from features was screened. Soil was sampled for flotation and water screening from every level and feature, but unlike samples from settlements, it has not been processed and analyzed. Each tumulus, being roughly circular, was divided into quadrants along the cardinal directions, and 1-m baulks between quadrants were defined. Quadrants were excavated separately by level. Sometimes quadrants were excavated concurrently. Tumulus unit/level/feature designations are therefore preceded by tumulus (T000) and quadrant (Q000) numbers. Artifact provenience was recorded down to levels and features, with important in situ artifacts sometimes being mapped into level/feature drawings along x-y-z axes. Strata and artifacts were measured cm below surface using a dumpy level. All levels and features were drawn and photographed, individually and by quadrant. , In each mound we followed natural stratigraphy whenever and wherever possible. However, given the steep downward curves of many strata, following the slopes of mound surfaces, this was not always possible. Thus, it is likely that some levels combine artifacts from different mound strata. To control partially for this difficulty, quadrant levels were often subdivided into separate units on the interior or the exterior of mounds (designated “collections units” or CUs). Mound and grave architecture, when present, was left in place until fully defined and documented and then removed if necessary. Baulks were drawn in profile and photographed and removed en masse at the end of each excavation., and Prior to excavation, all mounds surveyed in Shtoj and Shkrel were mapped and fully documented. The state of preservation (present day and projected into the future) of each mound was recorded (from poor to excellent, and from fully safe to critically endangered). Given that so many mounds in both regions were already damaged or had been destroyed, or were actively threatened, we decided to excavate mounds that were (1) already completely removed (T-085), (2) damaged by agricultural activities (T-052), (3) going to be removed by a landowner (despite legal prohibitions) (T-088), and (4) previously looted or excavated (T-099). We did not want to excavate seemingly intact, undamaged mounds. Our tumulus excavations can therefore be aptly described as “rescue” excavations.
- Keyword:
- archaeology
- Discipline:
- Science and Humanities
5Works -
Realm 2: Settlement Excavations
User Collection
- Creator:
- Galaty, Michael
- Description:
- The PASH Data Collection is comprised of Five data “realms”: 1) Survey and site data, 2) Settlement excavations, 3) Tumulus (burial mound) survey and excavations, 4) Artifact analysis, and 5) Geological data. All databases, field notebooks, unit and profile drawings, photographs, photo descriptions, radiocarbon dates, and geophysical survey data related to the settlement excavations have been made available in PASH Realm 2. and The excavations we conducted at Kodër Boks, Zagorë, and Gajtan were designed to gather as much data as possible, as quickly as possible. They were composed of test pits (“units,” i.e., sondages), primarily 1x1 m in size, occasionally larger, positioned based on the results of field surveys and systematic surface collections of artifacts, but also with reference to prior excavations (at Zagorë and Gajtan) and geophysical data (collected at Gajtan). Excavations followed natural stratigraphy where possible; when such strata were not present, we excavated in 10-cm arbitrary levels. Artifact provenience was recorded down to levels and features, with important in situ artifacts sometimes being mapped into level/feature drawings along x-y-z axes. When identified, archaeological features (e.g., pits, floors, walls, etc.) were excavated separately from levels. Excavators organized forms and accompanying journal entries by “level” and “feature” for each unit. Each level and feature was drawn and photographed. Artifacts were bagged together by level and type. Radiocarbon samples were wrapped in tin foil and bagged separately. Soil samples were taken from each level using the “pinch” method. Upon completion, a profile wall of each unit was photographed, and, in some cases, drawn. Artifacts (with the exception of metal) were washed in water, dried on racks in the sun, and sorted and labeled in the PASH field laboratory. They were analyzed in preliminary fashion first in the field by PASH staff and later by experts.
- Keyword:
- archaeology
- Discipline:
- Science and Humanities
3Sub-collections0Works -
Realm 4: Artifact Analysis
User Collection
- Creator:
- Galaty, Michael
- Description:
- The PASH Data Collection is comprised of Five data “realms”: 1) Survey and site data, 2) Settlement excavations, 3) Tumulus (burial mound) survey and excavations, 4) Artifact analysis, and 5) Geological data. All databases, drawings, photographs, photo descriptions, radiocarbon dates, and analytical data related to artifacts, ecofacts, and human remains have been made available in PASH Deep Blue Data Realm 4. Each artifact dataset will include all or some of the following: - Database files: CSV, Excel, PDF, Word; - Photos: Jpeg; - Drawings: PDF Total size of all files: approximately 10 gigabytes. See individual records or readme for linked chapters. and All artifacts found in the course of survey and excavation were brought to a museum facility in Shkodër (at the Hotel Meteor, on the Shkodër-Koplik road). They were cleaned, labeled, drawn, photographed, and described. Artifact descriptions were entered into one of three databases: pottery, chipped stone, and small finds. Each artifact was assigned a unique identifying number containing locational information. Pottery numbers typically begin with a tract or other collection unit (e.g., grid square in a site-surface collection) identifier, followed by a sequence number if more than one potsherd or ceramic was located in a tract or unit. Lithics and other small finds were assigned a GT number (GT-001, GT-002, etc.; GT being the Albanian acronym for Small Find). During a study season held in December 2014, artifacts were analyzed in more detail by specialists, each of whom produced a lengthier description of pottery, chipped stone, or small finds. A subset of ceramic and groundstone samples was retained for petrographic and chemical analysis. Finally, all seeds and wood charcoal recovered through flotation and all animal bones were analyzed. Human remains from Tumulus 99 were subjected to Strontium-isotope and aDNA analysis.
- Keyword:
- archaeology
- Discipline:
- Humanities and Science
6Works -
Realm 1: Field Survey and Site Collections
User Collection
- Creator:
- Galaty, Michael
- Description:
- The PASH Data Collection is comprised of Five data “realms”: 1) Survey and site data, 2) Settlement excavations, 3) Tumulus (burial mound) survey and excavations, 4) Artifact analysis, and 5) Geological data. All databases, field notebooks, paper maps, GIS files, photographs, and photo descriptions related to the intensive survey, of tracts and tumuli, and the collection of sites have been made available in PASH Deep Blue Data Realm 1 (this sub-collection)., Over the course of five years, 11 field teams (Teams A–K) surveyed 2530 tracts in Shkrel and Shtoj, covering 16.1 km2. Survey data were eventually collapsed into six geographic zones (1–6). All tracts were surveyed using standard Mediterranean survey methods. For each tract (recorded consecutively by team letter and a number, e.g. A-001, A-002, etc.), surveyors walked at 15-m intervals and counted all tile/brick, ceramic fragments, and small finds. We conducted a full-coverage survey, meaning that all land forms—including fields, hills, and terraces—in each survey zone were surveyed, unless the landowner objected or the vegetation was so dense as to render survey impossible. Each tract was photographed and a GPS point at the center of the tract was obtained. Photos and photo descriptions were maintained in separate databases by each team. Information about tracts was recorded by hand in notebooks by team leaders. This included data about a tract’s soil, geology, ground cover (plants growing in the tract, crops planted in the field), associated structures, associated archaeological features (including tumuli), informant testimony, visibility, and, most critically, artifact counts. , and Realm 1 is divided into two sub-collections: Survey Data and Site Data. Both sub-collections are organized by data type. Survey data includes Tract photos and Photologs, Survey maps, Spatial data files, and a Collection Unit (CU) survey database. Site Data includes the Site database, Site documentation, Site photos and Photologs, and Spatial data files.
- Keyword:
- archaeology
- Discipline:
- Science and Humanities
2Sub-collections0Works -
Realm 5: Geological Data
User Collection
- Creator:
- Galaty, Michael
- Description:
- The PASH Data Collection is comprised of Five data “realms”: 1) Survey and site data, 2) Settlement excavations, 3) Tumulus (burial mound) survey and excavations, 4) Artifact analysis, and 5) Geological data. All of the geological data from cores and auger holes have been made available in PASH Deep Blue Data Realm 5. , Much of the work conducted by PASH took place on a geomorphic feature we call the Shtoj alluvial fan. Geological research was done along the distal margins of the Shtoj alluvial fan in the fringing freshwater wetlands of Shkodër Lake. Field reconnaissance in 2010 consisted of drilling twelve 5-cm diameter auger holes across the fan to a maximum depth of 4.8 m. A composite sediment sample was collected every 0.3 m during drilling. Between 2012 and 2014, sediment cores were taken at four wetland locations on the southeastern shore of Shkodër Lake. North-south trending core locations were selected following results of samples collected during the 2010 reconnaissance and are 1 km east of the Shkodër Lake shoreline. Twenty-two cores, ranging in length from 0.24 m to 0.87 m, were taken from four sites using a 6.3-cm diameter polycarbonate piston corer. , and (See readme in Geological Data record for full documentation; Chapter linked to: Chapter Two).
- Keyword:
- archaeology
- Discipline:
- Science and Humanities
1Works -
- Creator:
- University of Michigan Museum of Paleontology and CTEES
- Description:
- Reconstructed CT slices for Right innominate (acetabulum region) of Remingtonocetus domandaensis (University of Michigan Museum of Paleontology catalog number GSP-UM 3408) as a series of TIFF images. Raw projections are not included in this dataset. The reconstructed slice data from the scan are offered here as a series of unsigned 16-bit integer TIFF images. The upper left corner of the first image (*_0000.tif) is the XYZ origin.
- Keyword:
- Paleontology, Fossil, CT, Remingtonocetidae, UMMP, University of Michigan Museum of Paleontology, Eocene, and Geological Survey of Pakistan (GSP)
- Discipline:
- Science
-
- Creator:
- University of Michigan Museum of Paleontology and CTEES
- Description:
- Reconstructed CT slices for phalanx (pathological) of phytosaur (University of Michigan Museum of Paleontology catalog number UMMP VP 13838) as a series of TIFF images. Raw projections are not included in this dataset. The reconstructed slice data from the scan are offered here as a series of unsigned 16-bit integer TIFF images. The upper left corner of the first image (*_0000.tif) is the XYZ origin.
- Keyword:
- Paleontology, Fossil, CT, Phytosauria, UMMP, University of Michigan Museum of Paleontology, Triassic, and e06c6866-4cba-4532-2a68-d8e3357a674e
- Discipline:
- Science
-
- Creator:
- Lehman John T
- Description:
- Data were collected while developing a management plan for eliminating nuisance algal blooms in a chain of reservoirs along the Huron River in southeastern Michigan. Federal funding was provided by both the U.S. EPA and the USDA. The river-reservoir system is used for municipal drinking water, wastewater disposal, irrigation, industrial processes, hydroelectric generation, sport fishing, and recreation. The impoundments episodically developed surface scums of cyanobacteria, contained microcystin toxins, and emitted foul odors including hydrogen sulfide. Past management strategy had focused on external phosphorus loading but failed to prevent nuisance conditions. Data collection and analysis pointed to the overwhelming role of internal nutrient loading and resulted in a series of whole lake experiments that destratified Ford Lake during summer and eliminated the nuisance conditions.
- Keyword:
- Eutrophication, Limnology, and Nuisance Algae
- Citation to related publication:
- Ferris JA, Lehman JT. 2007. Interannual variation in diatom bloom dynamics: roles of hydrology, nutrient limitation, sinking, and whole lake manipulation. Water Res. 41:2551-2562., Ferris JA, Lehman JT. 2008. Nutrient budgets and river impoundments: Interannual variation and implications for detecting future changes. Lake Reserv Manage. 24:273-281., Goldenberg SZ, Lehman JT. 2012. Diatom response to the whole lake manipulation of a eutrophic urban impoundment. Hydrobiologia 691:71-80., Lehman EM, McDonald KE, Lehman JT. 2009. Whole lake selective withdrawal experiment to control harmful cyanobacteria in an urban impoundment. Water Res. 43:1187-1198., Lehman JT, Ferris JA, Platte RA. 2007. Role of hydrology in development of a vernal clear water phase in an urban impoundment. Freshwater Biol. 52:1773-1781., Lehman JT, Bell DW, McDonald KE. 2009. Reduced river phosphorus following implementation of a lawn fertilizer ordinance. Lake Reserv Manage. 25:307-312., Lehman JT. 2011. Nuisance cyanobacteria in an urbanized impoundment: Interacting internal phosphorus loading, nitrogen metabolism, and polymixis. Hydrobiologia 611:277-287., Lehman JT, Bell DW, Doubek JP, McDonald KE. 2011. Reduced additions to river phosphorus for three years following implementation of a lawn fertilizer ordinance. Lake Reserv Manage. 27:390-397. , Lehman JT, Doubek JP, Jackson EW. 2013. Effect of reducing allochthonous P load on alkaline phosphatase activity of phytoplankton in an urbanized watershed, SE Michigan, U.S.A. Lake Reserv Manage. 29:116-125., Lehman JT 2014. Understanding the role of induced mixing for management of nuisance algal blooms in an urbanized reservoir. Lake Reserv Manage. 30:1-9., and McDonald KE, Lehman JT. 2013. Dynamics of Aphanizomenon and Microcystis (cyanobacteria) during experimental manipulation of an urban impoundment. Lake Reserv Manage. 29:103-115.
- Discipline:
- Science
-
- Creator:
- Kort, Eric A., Plant, Genevieve, Brandt, Adam R., Chen, Yuanlei, Fordice, Graham, Gorchov Negron, Alan M., Schwietzke, Stefan, Smith, Mackenzie, and Zavala-Araiza, Daniel
- Description:
- As part of the Flaring & Fossil Fuels: Uncovering Emissions & Losses (F3UEL) project, the aircraft measurement platform sampled downwind of flares in the Permian and Eagle Ford regions of Texas (2020) and the Bakken in North Dakota (2021). Estimates of methane destruction removal efficiency are calculated for each airborne intercept of a flare combustion plume based on the observed enhancements of carbon dioxide and methane, along with assumptions about the flare gas composition. Locations provided are the GPS coordinates for the aircraft sampling, not of the upwind flare infrastructure on the ground. Attempts to link the airborne sampling locations to ground infrastructure using the provided wind information (measured at the aircraft), should take care to account for complexities of transport in the atmosphere.
- Keyword:
- Natural Gas Flaring, Methane, and Oil & Gas
- Citation to related publication:
- Plant, G., Kort, E. A., Brandt, A. R., Chen, Y., Fordice, G., Gorchov Negron, A. M., Schwietzke, S., Smith, M., & Zavala-Araiza, D. (2022). Inefficient and unlit natural gas flares both emit large quantities of methane. Science, 377(6614), 1566–1571. https://doi.org/10.1126/science.abq0385, Kort, E. A., Plant, G., Smith, M. L., Brandt, A. R., Chen, Y., Gorchov Negron, A. M., Schwietzke, S., Zavala-Araiza, D. (2022). Aircraft Data (2020) for Flaring & Fossil Fuels: Uncovering Emissions & Losses (F3UEL), University of Michigan - Deep Blue Data. https://doi.org/10.7302/1xjm-3v49, and Kort, E. A., Plant, G., Brandt, A. R., Chen, Y., Gorchov Negron, A. M., Schwietzke, S., Smith, M. L., Zavala-Araiza, D. (2022). Aircraft Data (2021) for Flaring & Fossil Fuels: Uncovering Emissions & Losses (F3UEL), University of Michigan - Deep Blue Data. https://doi.org/10.7302/6tgq-e116
- Discipline:
- Science
-
- Creator:
- Galaty, Michael
- Description:
- A folder with photos taken of each site. These are JPEGS. Some photographs (e.g., S004) are labelled with site number, date taken, and an appended ID number in consecutive order (e.g., S001-060610-001 = Site 001, June 6, 2010, Photo 001 from Kratul i Madh). Others are labeled generically. ID numbers were repeated at each subsequent site surveyed, beginning again with 001. Some site photos are accompanied by a photolog, while others are not. The photolog typically lists each photo taken of a site in order by photo number, with a description.
- Keyword:
- archaeology
- Discipline:
- Science
-
- Creator:
- Galaty, Michael
- Description:
- PDF of scans of the original tract maps drawn in the field by each team leader. These were digitized each night to create shape files for each tract in the PASH Geographic Information System (GIS).
- Discipline:
- Science
-
- Creator:
- Galaty, Michael
- Description:
- PDFs of scans of miscellaneous documents related to a particular excavation, including, e.g., excavation forms, maps of units, and drawings of units and unit profiles.
- Keyword:
- archaeology
- Discipline:
- Science and Humanities