联合卫星测高和卫星重力数据研究热容海平面变化

首先用卫星测高资料计算了1993～2009年6月的全球平均海平面变化。用GRACE(gravity recovery andclimate experiment)时变重力场系数反演了2003～2009年6月全球平均海水质量变化。联合GRACE和卫星测高资料计算了2003～2009年6月的热容海平面变化,该变化呈上升趋势。用日本气象局Ishii等提供的海温数据计算了1993～2006年的海水引起的平均热膨胀海平面变化,1993～2003年间,全球海洋热膨胀引起的热容海平面呈上升趋势,约占同期平均海平面变化的一半。利用ARGO温盐数据计算了2004～2009年6月平均热容海平面变化,也呈上升态势,只是变化速率有所减慢。

Study of Steric Sea Level Variations Combining the Data from Altimetry and GRACE

Global mean sea level anomalies from satellite radar altimetry during1993~2009.6 have been estimated.Then this paper shows global eustatic sea level derived from GRACE during 2003~2009.6.This paper minus global eustatic sea level from global mean sea level anomalies.In this way,＇Altimetry minus GRACE＇-derived steric sea level variations are calculated,which show a positive trend.At the same time,this paper studies mean steric sea level from the data provided by Ishii et al.from 1993 to 2006.During 1993~2003,the steric sea level variations rise rapidly.This component accounts about 50% of mean sea level rise.This paper also studies steric sea level variations from the data provided by ARGO project from 2004~2009.6.It shows a positive trend too.But the rate is smaller than the rate during 1993~2003.