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全球平均海平面变化主要包括海水质量变化引起的海平面变化和海水温盐变化引起的海平面变化.本文利用卫星测高、GRACE卫星重力和海洋浮标温盐数据,对全球海平面变化及其规律进行了研究.2005-2013年,无论是在季节尺度还是在年际尺度上,海水质量变化(GRACE)和海水温盐变化(比容)引起的全球平均海平面变化之和,与卫星测高观测的结果吻合得很好.2005-2013年,测高、GRACE和Argo浮标得到的海平面变化、质量引起的海平面变化和比容海平面变化的趋势分别为2.6±0.2 mm/yr、1.7±0.2 mm/yr和0.7±0.2 mm/yr,质量引起的海平面变化约占总变化趋势的三分之二.2010-2011年强烈的La Nina现象导致全球海平面下降了6mm左右,这与GRACE观测到的同期海水质量变化相吻合.2011年以来,全球平均海平面又呈快速上升趋势,且以海水质量的贡献为主.
The global mean sea-level change mainly includes the sea-level change caused by the change of the sea water quality and the sea-level change caused by the change of temperature and salinity of the sea water.Based on the satellite altimetry, GRACE satellite gravity and temperature and salinity data of ocean buoys, the global sea level change and its regularity 2005-2003, the sum of the global average sea-level changes caused by the change of seawater quality (GRACE) and seawater temperature and salinity (specific volume) at either seasonal scale or interannual scale, From 2005 to 2013, sea level changes, mass-induced sea-level changes and sea-level changes of specific volume were 2.6 ± 0.2 mm / yr and 1.7 ± 0.2 mm / yr and 0.7 ± 0.2 mm / yr, and sea level change caused by mass accounts for about two thirds of the total trend. The strong La Nina phenomenon in 2010-2011 has led to a drop of about 6 mm in global sea level, The changes in the mass of seawater that coincide with those observed by GRACE coincide. Since 2011, the average global sea level has also risen rapidly, mainly with the contribution of seawater quality.