联合Argo浮标、卫星测高和GRACE数据研究海平面变化

The Study of Global Sea Level Change by Combining Argo Floats Data、Satellite Altimetry and GRACE Observations

利用2004-01—2010-12间Argo浮标采集的温度和盐度数据,通过数值积分方法计算了65°S～65°N间的比容海平面异常,并通过最小二乘拟合得到比容海平面变化的长期趋势为(0.63±0.45)mm/a,与Llovel得到的结果吻合较好。利用卫星测高数据得到该时间段内海平面变化趋势为(2.52±0.71)mm/a,GRACE反演得到的海水质量变化引起的海平面趋势为(1.84±0.13)mm/a,结果表明海水质量变化成为引起海平面变化的主要因素。最后对联合卫星测高、GRACE得到比容海平面变化与相应Argo浮标数据计算结果的空间分布特征进行了比较。

The oceanic temperature and salt observed by Argo floats from January 2004 to December 2010 are used to derive the steric sea level anomaly between 65°S～65°N by vertical integration up to a depth of 1000 m, the linear trend of global steric sea level is estimated as 0.63 mm/a by using least squares estimation with an annual signal. Within the same time period, the global sea level change estimated from satellite altimetry is about 2. 52 mm/a, meanwhile, the sea level change due to oceanic mass change is estimated as 1.84 mm/a from GRACE monthly due to oceanic mass change sea level change from satellite altimetry,GRACE, and Argo floats, one can see that the steric sea level change from Argo floats is close to that derived by combining satellite altimetry and GRACE. The spatial distribution of the steric sea level is also compared and similar patterns can be found.