基于多源数据的全球比容海平面变化研究

摘要

利用2005—2009年共60个月的卫星测高、GRACE数据计算全球66°S~66°N比容海平面变化,同时利用Argo数据计算得到该区域的比容海平面变化,结果可知比容海平面具有明显的周年变化.比较不同方法得到的比容海平面变化发现二者在整体趋势上较为一致,但局部也存在着差异.联合卫星测高、GRACE和利用 Argo数据得到2005—2009年比容海平面变化振幅分别为10.5 mm和4.3 mm,长期变化趋势分别为1.63mm/a和0.32mm/a.%The steric sea level budge of the 65°S~65°N is calculated using the satellite altimetry,GRACE and Argo data from Jan 2005 to Dec 2009.An obvious annual signal can be seen from the results.The steric sea levels calculated from two different method agree well in most regions,while poor in some regions.The phase of steric sea level budge derived from satellite altimetry and GRACE data is 10.5 mm, and from Argo data is 4.3 mm.The trend of steric sea level derived from satellite altimetry shows that GRACE data and Argo data are 1.63 mm/year and 0.32 mm/year.