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Toward Realistic Nonstationarity of Semidiurnal Baroclinic Tides in a Hydrodynamic Model

dc.contributor.authorNelson, Arin D.
dc.contributor.authorArbic, Brian K.
dc.contributor.authorZaron, Edward D.
dc.contributor.authorSavage, Anna C.
dc.contributor.authorRichman, James G.
dc.contributor.authorBuijsman, Maarten C.
dc.contributor.authorShriver, Jay F.
dc.date.accessioned2019-11-12T16:24:00Z
dc.date.availableWITHHELD_11_MONTHS
dc.date.available2019-11-12T16:24:00Z
dc.date.issued2019-09
dc.identifier.citationNelson, Arin D.; Arbic, Brian K.; Zaron, Edward D.; Savage, Anna C.; Richman, James G.; Buijsman, Maarten C.; Shriver, Jay F. (2019). "Toward Realistic Nonstationarity of Semidiurnal Baroclinic Tides in a Hydrodynamic Model." Journal of Geophysical Research: Oceans 124(9): 6632-6642.
dc.identifier.issn2169-9275
dc.identifier.issn2169-9291
dc.identifier.urihttps://hdl.handle.net/2027.42/152034
dc.description.abstractSemidiurnal baroclinic tide sea surface height (SSH) variance and semidiurnal nonstationary variance fraction (SNVF) are compared between a hydrodynamic model and altimetry for the low‐ to middle‐latitude global ocean. Tidal frequencies are aliased by ∼10‐day altimeter sampling, which makes it impossible to unambiguously identify nonstationary tidal signals from the observations. In order to better understand altimeter sampling artifacts, the model was analyzed using its native hourly outputs and by subsampling it in the same manner as altimeters. Different estimates of the semidiurnal nonstationary and total SSH variance are obtained with the model depending on whether they are identified in the frequency domain or wave number domain and depending on the temporal sampling of the model output. Five sources of ambiguity in the interpretation of the altimetry are identified and briefly discussed. When the model and altimetry are analyzed in the same manner, they display qualitatively similar spatial patterns of semidiurnal baroclinic tides. The SNVF typically correlates above 80% at all latitudes between the different analysis methods and above 60% between the model and altimetry. The choice of analysis methodology was found to have a profound effect on estimates of the semidiurnal baroclinic SSH variance with the wave number domain methodology underestimating the semidiurnal nonstationary and total SSH variances by 68% and 66%, respectively. These results produce a SNVF estimate from altimetry that is biased low by a factor of 0.92. This bias is primarily a consequence of the ambiguity in the separation of tidal and mesoscale signals in the wave number domain.Key PointsHydrodynamic models incorporating mesoscale dynamics and tides are beginning to resolve stationary and nonstationary baroclinic tidesThe ratio of nonstationary to total semidiurnal variance computed from altimetry and HyCOM simulations agrees at low and middle latitudesComparisons of analysis methodologies show that total and nonstationary semidiurnal variances are underestimated in altimetry on average
dc.publisherGODAE OceanView
dc.publisherWiley Periodicals, Inc.
dc.subject.otherHyCOM
dc.subject.otherinternal tide
dc.subject.othernonstationary tide
dc.subject.otheraltimetry
dc.subject.othermodel‐data comparison
dc.subject.otherSWOT
dc.titleToward Realistic Nonstationarity of Semidiurnal Baroclinic Tides in a Hydrodynamic Model
dc.typeArticle
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelAtmospheric and Oceanic Sciences
dc.subject.hlbsecondlevelGeological Sciences
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/152034/1/jgrc23624_am.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/152034/2/jgrc23624.pdf
dc.identifier.doi10.1029/2018JC014737
dc.identifier.sourceJournal of Geophysical Research: Oceans
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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