DOI: 10.1029/2018JC014108
Scopus记录号: 2-s2.0-85052620557
论文题名: Time Variations in Ocean Bottom Pressure from a Few Hours to Many Years: In Situ Data, Numerical Models, and GRACE Satellite Gravimetry
作者: Poropat L. ; Dobslaw H. ; Zhang L. ; Macrander A. ; Boebel O. ; Thomas M.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 8 起始页码: 5612
结束页码: 5623
语种: 英语
英文摘要: In situ ocean bottom pressure (OBP) obtained from 154 different locations irregularly scattered over the globe is carefully processed to isolate signals related to the ocean general circulation and large-scale sea level changes. Comparison against a global numerical ocean model experiment indicates poor correspondence for periods below 24 hr, possibly related to residual tidal signals and small timing errors in the atmospheric forcing applied to the ocean model. Correspondence increases rapidly for periods between 3 and 10 days, where wind-driven dynamics are already well understood and consequently well implemented into numerical models. Coherence decreases again for periods around 30 days and longer, where processes not implemented into ocean general circulation models as barystatic sea level changes become more important. Correspondence between in situ data and satellite-based OBP as obtained from the Gravity Recovery and Climate Experiment (GRACE) German Research Centre for Geosciences RL05a gravity fields critically depends on the postprocessing of Level-2 Stokes coefficients that also includes the selection of appropriate averaging regions for the GRACE-based mass anomalies. The assessment of other available GRACE Level-2 products indicates even better fit of more recent solutions as ITSG-Grace2016 and the Center for Space Research and Jet Propulsion Laboratory RL05 mascons. In view of the strong high-frequency component of OBP, however, a higher temporal resolution of the oceanic GRACE products would be rather advantageous. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113340
Appears in Collections: 气候减缓与适应
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作者单位: Department 1: Geodesy, GFZ German Research Centre for Geosciences, Potsdam, Germany; Marine and Freshwater Research Institute, Reykjavík, Iceland; Alfred Wegener Institute for Polar und Marine Research, Bremerhaven, Germany; Institute of Meteorology, Freie Universität Berlin, Berlin, Germany
Recommended Citation:
Poropat L.,Dobslaw H.,Zhang L.,et al. Time Variations in Ocean Bottom Pressure from a Few Hours to Many Years: In Situ Data, Numerical Models, and GRACE Satellite Gravimetry[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(8)