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Constraining Aerosol Vertical Profile in the Boundary Layer Using Hyperspectral Measurements of Oxygen Absorption

dc.contributor.authorZeng, Zhao‐cheng
dc.contributor.authorNatraj, Vijay
dc.contributor.authorXu, Feng
dc.contributor.authorPongetti, Thomas J.
dc.contributor.authorShia, Run‐lie
dc.contributor.authorKort, Eric A.
dc.contributor.authorToon, Geoffrey C.
dc.contributor.authorSander, Stanley P.
dc.contributor.authorYung, Yuk L.
dc.date.accessioned2018-11-20T15:34:55Z
dc.date.available2019-12-02T14:55:09Zen
dc.date.issued2018-10-16
dc.identifier.citationZeng, Zhao‐cheng ; Natraj, Vijay; Xu, Feng; Pongetti, Thomas J.; Shia, Run‐lie ; Kort, Eric A.; Toon, Geoffrey C.; Sander, Stanley P.; Yung, Yuk L. (2018). "Constraining Aerosol Vertical Profile in the Boundary Layer Using Hyperspectral Measurements of Oxygen Absorption." Geophysical Research Letters 45(19): 10,772-10,780.
dc.identifier.issn0094-8276
dc.identifier.issn1944-8007
dc.identifier.urihttps://hdl.handle.net/2027.42/146438
dc.description.abstractThis study attempts to infer aerosol vertical structure in the urban boundary layer using passive hyperspectral measurements. A spectral sorting technique is developed to retrieve total aerosol optical depth (AOD) and effective aerosol layer height (ALH) from hyperspectral measurements in the 1.27â μm oxygen absorption band by the mountaintop Fourier Transform Spectrometer at the California Laboratory for Atmospheric Remote Sensing instrument (1,673 m above sea level) overlooking the LA basin. Comparison to AOD measurements from Aerosol Robotic Network and aerosol backscatter profile measurements from a Mini MicroPulse Lidar shows agreement, with coefficients of determination (r2) of 0.74 for AOD and 0.57 for effective ALH. On average, the AOD retrieval has an error of 24.9% and rootâ meanâ square error of 0.013, while the effective ALH retrieval has an error of 7.8% and rootâ meanâ square error of 67.01 m. The proposed method can potentially be applied to existing and future satellite missions with hyperspectral oxygen measurements to constrain aerosol vertical distribution on a global scale.Plain Language SummarySatellite and groundâ based measurements have enabled accurate and continuous monitoring of total aerosol loading. However, these measurements provide little or no information on the vertical distribution of aerosols. In particular, there is poor measurement of aerosols in the planetary boundary layer, the part of the atmosphere closest to the surface. In this study, we develop an algorithm to retrieve the vertical structure of aerosols in the boundary layer using remote sensing observations of oxygen absorption with high spectral resolution. The algorithm is applied to infer the vertical profile of air pollutants in the Los Angeles basin using measurements made by a mountaintop instrument overlooking the basin. The proposed retrieval algorithm can potentially be applied to existing and future satellite missions with hyperspectral oxygen measurements to constrain the aerosol vertical distribution on a global scale. This important piece of information on aerosol vertical structure will potentially address several key priorities in the 2017 U.S. National Research Council Earth Science Decadal Survey, from forecasting air pollution in cities, quantifying the aerosol impact on Earth’s climate, and reducing biases in greenhouse gas retrievals.Key PointsA method is developed to constrain aerosol vertical profiles in the boundary layer using hyperspectral measurements of oxygen absorptionThe method is tested using hyperspectral measurement of reflected solar radiation from a mountaintop instrument to infer aerosol profilesThe method can potentially be applied to satellite observations to constrain aerosol vertical structure on a global scale
dc.publisherInternational Society for Optics and Photonics
dc.publisherWiley Periodicals, Inc.
dc.subject.otherCLARS
dc.subject.otherremote sensing
dc.subject.otherhyperspectral
dc.subject.otherPBL
dc.subject.otheraerosol profiling
dc.subject.othermegacity
dc.titleConstraining Aerosol Vertical Profile in the Boundary Layer Using Hyperspectral Measurements of Oxygen Absorption
dc.typeArticleen_US
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelGeological Sciences
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/146438/1/grl58079.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/146438/2/grl58079_am.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/146438/3/grl58079-sup-0001-2018GL079286-SI.pdf
dc.identifier.doi10.1029/2018GL079286
dc.identifier.sourceGeophysical Research Letters
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