Antarctic circumpolar current from satellite gravimetric models ITG-GRACE2010, GOCE-TIM3 and satellite altimetry

	Antarctic circumpolar current from satellite gravimetric models ITG-GRACE2010, GOCE-TIM3 and satellite altimetry
	Feng, Guiping1,2 ; Jin, Shuanggen1 ; Sanchez Reales, Jose M.3
刊名	JOURNAL OF GEODYNAMICS
	2013-12-01
卷号	72 期号:1 页码:72-80
关键词	Antarctic circumpolar current GOCE GRACE Ocean dynamic topography Satellite altimetry
英文摘要	The Antarctic circumpolar current (ACC) is a clockwise ocean flow from west to east around Antarctica, connecting the Pacific, Indian and Atlantic oceans, and plays a key role in the heat transport and climate change. The geostrophic surface currents can be derived from the ocean dynamic height as the deviation of the actual sea level from satellite altimetry and the Earth's geoid. Although the gravity recovery and climate experiment (GRACE) and gravity field and steady-state ocean circulation explorer (GOCE) mission provided an initial estimate of global geostrophic currents, a more detailed Antarctic circumpolar current is still not well estimated. In this paper, the detailed ACC is estimated from the newest ITG-Grace2010 gravity model based on 7-years of GRACE data, and GO_CONS_GCF_2_TIM_R3 gravity model (hereafter referred to GOCE-TIM3) based on 12 months of GOCE data, with the mean sea surface height model MSS_CNES_CLS_11 from satellite altimetry, respectively. The evaluation and comparisons are performed with oceanographic models, the GOCO03S gravity model as well as in situ drifter's measurements. Results show that the Antarctic circumpolar current based on GOCE gravity field model depicts more details and transport characteristics with high accuracy and spatial resolution, e.g., Agulhas currents and Brazil-Malvinas Confluence regions, which are more consistent with the in situ drifter's results. The ACC based on ITG-Grace2010 model is similar with the result of the GOCE-TIM3 model with RMS of 8.39 cm/s and 7.85 cm/s, respectively, while the accuracy of GOCE-TIM3 is still higher. The correlation coefficients of the estimated velocities, compared to drifter results, are 0.70 and 0.76 for ITG-Grace2010 and GOCE-TIM3. ITG-Grace2010 model has more noise in the higher spherical harmonic coefficients and some better performances in the geostrophic currents are able to be obtained if the degrees are truncated to 160 for ITG-Grace2010, while the GOCE-TIM3 and GOCO03S model do not have this phenomenon. The gravity model GOCO03S with combined CHAMP, GRACE and GOCE observations almost have no improvement in ACC estimate when compared with GOCE-TIM3 results, while the RMS of GOCO03S is a little larger than the GOCE-TIM3 results. (C) 2013 Elsevier Ltd. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geochemistry & Geophysics
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	MEAN DYNAMIC TOPOGRAPHY ; SOUTHERN-OCEAN ; SEA-SURFACE ; GOCE ; GRACE ; VARIABILITY ; CIRCULATION ; DRIFTERS ; PACIFIC ; GRAVITY
收录类别	SCI
语种	英语
WOS记录号	WOS:000329482500009
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18068]
专题	上海天文台_天文地球动力学研究中心
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Alicante, Dept Appl Math, E-03080 Alicante, Spain
推荐引用方式 GB/T 7714	Feng, Guiping,Jin, Shuanggen,Sanchez Reales, Jose M.. Antarctic circumpolar current from satellite gravimetric models ITG-GRACE2010, GOCE-TIM3 and satellite altimetry[J]. JOURNAL OF GEODYNAMICS,2013,72(1):72-80.
APA	Feng, Guiping,Jin, Shuanggen,&Sanchez Reales, Jose M..(2013).Antarctic circumpolar current from satellite gravimetric models ITG-GRACE2010, GOCE-TIM3 and satellite altimetry.JOURNAL OF GEODYNAMICS,72(1),72-80.
MLA	Feng, Guiping,et al."Antarctic circumpolar current from satellite gravimetric models ITG-GRACE2010, GOCE-TIM3 and satellite altimetry".JOURNAL OF GEODYNAMICS 72.1(2013):72-80.