DOI: 10.1029/2018JC014189
Scopus记录号: 2-s2.0-85052446410
论文题名: Variations of the Argentine Gyre Observed in the GRACE Time-Variable Gravity and Ocean Altimetry Measurements
作者: Yu Y. ; Chao B.F. ; García-García D. ; Luo Z.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 8 起始页码: 5375
结束页码: 5387
语种: 英语
英文关键词: altimetry
; Argentine Gyre
; eddies
; GRACE
; time-variable gravity
英文摘要: We investigate the nonseasonal and high-frequency variations of the Argentine Gyre in the south Atlantic Ocean by analyzing the time-variable gravity (TVG) measurements from the Gravity Recovery and Climate Experiment (GRACE) satellite mission in conjunction with the satellite ocean altimetry and two ocean general circulation model outputs (GLORYS2V4 and ECCO V4R3). We solve the empirical orthogonal functions (EOF) and complex EOF and find good agreement between TVG and altimetry observations, confirming the barotropic structure of the Argentine Gyre. In particular, the leading EOF modes of the overall up-and-down undulation in TVG and altimetry variations are found to be in pace temporally with the Antarctic Oscillation Index with correlation as high as 0.69 at zero time shift. Furthermore, the leading complex EOF mode signifies a counterclockwise dipole pattern of ~25-day periodicity within the overall gyre with multiscale amplitude modulation. The fact that GRACE does observe these signals, while the de-aliasing background ocean model fails to, ascertains that GRACE data have adequate sensitivity to allow the detection of TVG signals at spatial and temporal resolutions higher than practiced hitherto. The ~25-day oscillation is well recovered in the GLORYS2V4 ocean general circulation model, but not in ECCO V4R3. Our study demonstrates that satellite-observed TVG fields can be useful in studying oceanographic gyres, particularly the polar gyres, that are not well observed by altimetry and in situ data. ©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/113469
Appears in Collections: 气候减缓与适应
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作者单位: School of Geodesy and Geomatics, Wuhan University, Wuhan, China; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Applied Mathematics Department, University of Alicante, Alicante, Spain; MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan, China
Recommended Citation:
Yu Y.,Chao B.F.,García-García D.,et al. Variations of the Argentine Gyre Observed in the GRACE Time-Variable Gravity and Ocean Altimetry Measurements[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(8)