The global mean dynamic topography and its corresponding sea surface geostrophic current derived from GOCE gravity field model
-
摘要:
稳态海面地形(MDT)是大地测量学家和海洋学家共同关心的一个重要物理量。该文基于WHU2009全球平均海面高模型和GO_CONS_GCF_2_TIM_R3纯GOCE重力场模型,采用几何法经高斯滤波处理后确定了全球稳态海面地形,与CLS09及DTU10M DTs相比,其差值均方根RMS均小于8 cm,表明该文结果具有较高的精度;根据地转流方程计算了相应的表层地转流,与GRACE重力场模型GGM03S结果相比,GOCE重力场模型所确定的表层地转流在墨西哥湾流、黑潮及厄加勒斯海流等海域均体现了更强的流速和更多的细部特征,验证了GOCE在洋流探测中的优势。
Abstract:Mean dynamic topography (MDT) is an important physical quantity of common concern from geodetic scientists and oceanographers. In this paper, WHU2009 mean sea surface height model and GO_CONS_GCF_2_TIM_R3 gravity field model which is derived from GOCE data are used to calculate global mean dynamic topography using pointwise approach after Gaussian filtering, compared with CLS09 and DTU10 MDTs, their root-mean-square values are less than 8 cm, which can indicate that the MDT model calculated in this paper has high accuracy. Its corresponding sea surface geostrophic current is determined by geostrophic current equation, compared with the sea surface geostrophic current from GGM03S gravity field model, the result from GOCE shows stronger current speed and finer details in Gulf Stream, Kuroshio Current and Agulhas Current regions, it can be proved that GOCE has more advantages in determining mean dynamic topography and sea surface geostrophic current than GRACE.
-
Key words:
- mean dynamic topography /
- sea surface geostrophic current /
- GOCE /
- mean sea surface /
- geoid
-
管泽霖,管铮,翟国君. 海面地形与高程基准[M]. 北京:测绘出版社,1996. Levitus S. Climatological atlas of the world ocean[M].NOAA Prof. Pap. 13. U.S. Govt. Print. Office, Washington, D.C., 1982. 翟国君,黄谟涛,欧阳永忠,等. 卫星测高在海洋学中的应用[J]. 海洋测绘,2002,22(3): 58-63. 李建成,陈俊勇,宁津生,等. 地球重力场逼近理论与中国2000似大地水准面的确定[M].武汉:武汉大学出版社,2003. Tapley B D, Chambers D P, Bettadpur S, et al. Large scale ocean circulation from the GRACE GGM01 Geoid[J]. Geophysical Research Letters,2003, 30(22): 2163, doi: 10.1029/2003GL018622. Steven R Jayne. Circulation of the North Atlantic Ocean from altimetry and the Gravity Recovery and Climate Experiment geoid[J]. Journal of Geophysical Research, 2006, 111: C03005, doi: 10.1029/2005JC003128. Rio M H, Hernandez F. A mean dynamic topography computed over the world ocean from altimetry, in situ measurements and a geoid model[J]. Journal of Geophysical Research, 2004, 109: C12032. Ole B Andersen, Per Knudsen. DNSC08 mean sea surface and mean dynamic topography models[J]. Journal of Geophysical Research, 2009, 114: C11001, doi:10.1029/2008JC005179, 2009. Rio M H, Guinehut S, Larnicol G. New CNES-CLS09 global mean dynamic topography computedfrom the combination of GRACE data, altimetry, and in situ measurements[J]. Journal of Geophysical Research,2011, 116: C07018. Vianna M L, Menezes V V. Mean mesoscale global ocean currents from geodetic pre-GOCE MDTs with a synthesis of the North Pacific circulation[J]. Journal of Geophysical Research, 2010, 115: C02016. Knudsen P, Bingham R,.Andersen O, et al.. A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model[J]. J Geod, 2011, 85:861—879. Farrell S L, McAdoo D C, Laxon S W, et al. Mean dynamic topography of the Arctic Ocean[J]. Geophysical Research Letters, 2012,39, L01601, doi: 10.1029/2011GL050052. 金涛勇,李建成,姜卫平,等. 基于多源卫星测高数据的新一代全球平均海面高模型[J]. 测绘学报,2011,40(6): 723—729. Roland Pail, Sean Bruinsma, Federica Migliaccio, et al. First GOCE gravity ?eld models derived by three different approaches[J]. J Geod, 2011, 85:819—843. Rory J. Bingham, Keith haines Chris W. HUGHES. Calculating the Ocean's mean dynamic topography from a mean sea surface and a geoid[J]. Journal of Atmospheric and Oceanic Technology, 2008, 25: 1808-1822. 邓凯亮,暴景阳,章传银,等. 联合多代卫星测高数据确定中国近海稳态海面地形模型[J]. 测绘学报,2009, 38(2): 114-119. 张子占,陆洋,许厚泽. 利用卫星测量技术和小波滤波方法探测表层地转流[J]. 中国科学:D辑,2007,37(6): 753-760. Ole B Andersen,Per Knudsen. The DTU10 mean sea surface and mean dynamic topography. OSTST, Lissabon, Portugal, 2010.
计量
- 文章访问数: 2361
- HTML全文浏览量: 3
- PDF下载量: 962
- 被引次数: 0