DOI: 10.1016/j.jag.2014.03.012
Scopus记录号: 2-s2.0-84924412128
论文题名: A comparison of GOCE and drifter-based estimates of the North Atlantic steady-state surface circulation
作者: Bingham R ; J ; , Haines K ; , Lea D
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2015
卷: 35, 期: PA 起始页码: 140
结束页码: 150
语种: 英语
英文关键词: Mean dynamic topography
; North Atlantic
; Ocean currents
英文摘要: Over the last decade, due to the Gravity Recovery And Climate Experiment (GRACE) mission and, more recently, the Gravity and steady state Ocean Circulation Explorer (GOCE) mission, our ability to measure the ocean's mean dynamic topography (MDT) from space has improved dramatically. Here we use GOCE to measure surface current speeds in the North Atlantic and compare our results with a range of independent estimates that use drifter data to improve small scales. We find that, with filtering, GOCE can recover 70% of the Gulf Steam strength relative to the best drifter-based estimates. In the subpolar gyre the boundary currents obtained from GOCE are close to the drifter-based estimates. Crucial to this result is careful filtering which is required to remove small-scale errors, or noise, in the computed surface. We show that our heuristic noise metric, used to determine the degree of filtering, compares well with the quadratic sum of mean sea surface and formal geoid errors obtained from the error variance-covariance matrix associated with the GOCE gravity model. At a resolution of 100 km the North Atlantic mean GOCE MDT error before filtering is 5 cm with almost all of this coming from the GOCE gravity model. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79490
Appears in Collections: 气候变化事实与影响
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作者单位: School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; University of Reading, Reading, United Kingdom; Met Office, Exeter, United Kingdom
Recommended Citation:
Bingham R,J,, Haines K,et al. A comparison of GOCE and drifter-based estimates of the North Atlantic steady-state surface circulation[J]. International Journal of Applied Earth Observation and Geoinformation,2015-01-01,35(PA)