Sea level rise and the warming of the oceans in the Simple Ocean Data Assimilation (SODA) ocean reanalysis
Sea level rise and the warming of the oceans in the Simple Ocean Data Assimilation (SODA) ocean reanalysis
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DOI：
10.1029/2004jc002817
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发表时间：
2005-09-09
影响因子：
3.6
通讯作者：
Grodsky, SA
中科院分区：
文献类型：
--
作者：
Carton, JA;Giese, BS;Grodsky, SA
全球海洋环流的一个新的再分析被用来区分海平面上升的空间和海平面升降分量。最近的高度计观测表明，在过去十年中，海平面上升的速度增加到3.2毫米/年，远高于百年估计的1.5 - 2毫米/年。这种明显的增加可能是由于大陆冰的融化或热释和盐释效应的十年变化。空间效应的贡献进行了探讨，使用新的涡允许简单海洋数据同化版本1.2（SODA1.2）再分析全球温度，盐度，海平面跨越1958 - 2001年期间。这种海洋再分析的海平面研究的适用性进行评估，通过比较亚季节变化与收集的20个验潮站海平面记录，包括740年的数据。在所有的测量站，发现一个积极的关系，与r = 0.7的平均相关性后，校正的倒气压计的效果。从SODA1.2再分析计算的相对于1000米的动态高度，用作海平面的空间分量的代理，与1993 - 2001年的卫星推导的海平面进行比较。在这9年期间，动力高度以2.3 +/- 0.8 mm/年（-1）的全球速率增加，大大超过了0.5 mm/年（-1）的数十年空间速率。与卫星推算的海平面上升相比，热体积对海平面上升的贡献的增加率的相似性以及其空间结构的相似性表明，最近海平面上升的加速可以用海洋变暖和热膨胀的波动来解释，其误差在估计范围之内。
A new reanalysis of the global ocean circulation is used to distinguish between the steric and eustatic components of sea level rise. Recent altimeter observations indicate an increase in the rate of sea level rise during the past decade to 3.2 mm/ yr, well above the centennial estimate of 1.5 - 2 mm/ yr. This apparent increase could have resulted from enhanced melting of continental ice or from decadal changes in thermosteric and halosteric effects. The contribution from steric effects is explored using the new eddy-permitting Simple Ocean Data Assimilation version 1.2 ( SODA1.2) reanalysis of global temperature, salinity, and sea level spanning the period 1958 - 2001. The applicability of this ocean reanalysis for sea level studies is evaluated by comparing subseasonal variability with a collection of 20 tide gauge station sea level records, comprising a total of 740 years of data. A positive relationship is found at all gauge stations, with an average correlation of r = 0.7 after correction for the inverted barometer effect. Dynamic height calculated relative to 1000m from the SODA1.2 reanalysis, used as a proxy for the steric component of sea level, is compared with satellite- derived sea level for the years 1993 - 2001. During this 9- year period dynamic height increases at a global rate of 2.3 +/- 0.8 mm yr(-1), a substantial acceleration beyond the multidecadal steric rate of 0.5 mm yr(-1). The similarity of the rate of increase in the thermosteric contribution to sea level rise as well as the similarity of its spatial structure in comparison with satellite- derived sea level rise suggests that the recent acceleration in sea level rise is explainable to within the error estimates by fluctuations in warming and thermal expansion of the oceans.