Arctic Ocean basin liquid freshwater storage trend 1992-2012
Arctic Ocean basin liquid freshwater storage trend 1992-2012
复制标题
1992-2012年北冰洋盆地液态淡水储存趋势
DOI：
10.1002/2013gl058121
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发表时间：
2014
影响因子：
5.2
通讯作者：
Su, J.
中科院分区：
文献类型：
--
作者：
Rabe, B.;Karcher, M.;Kauker, F.;Schauer, U.;Toole, J. M.;Krishfield, R. A.;Pisarev, S.;Kikuchi, T.;Su, J.
北冰洋的淡水在区域海洋环流、海冰和全球气候中发挥着重要作用。根据各种平台观测到的盐度，我们第一次能够从所有上北冰洋盆地的每月网格场中估计出统计上可靠的液体淡水趋势。从1992年到2012年，这一趋势为600±300 km3yr−1。数值模型与观测到的淡水变化非常吻合。盐度下降约占淡水趋势的三分之二，上层增厚达三分之一。衡量区域风应力旋度的北冰洋振荡指数与我们的淡水时间序列有很好的相关性。与北极涛动或北极偶极子指数没有明显的关系。根据其他观测研究，白令海峡向北冰洋输入的淡水增加，戴维斯海峡输出的淡水减少，以及净海冰融化的增加可能在我们观察到的淡水趋势中发挥了重要作用。
Freshwater in the Arctic Ocean plays an important role in the regional ocean circulation, sea ice, and global climate. From salinity observed by a variety of platforms, we are able, for the first time, to estimate a statistically reliable liquid freshwater trend from monthly gridded fields over all upper Arctic Ocean basins. From 1992 to 2012 this trend was 600±300 km3yr−1. A numerical model agrees very well with the observed freshwater changes. A decrease in salinity made up about two thirds of the freshwater trend and a thickening of the upper layer up to one third. The Arctic Ocean Oscillation index, a measure for the regional wind stress curl, correlated well with our freshwater time series. No clear relation to Arctic Oscillation or Arctic Dipole indices could be found. Following other observational studies, an increased Bering Strait freshwater import to the Arctic Ocean, a decreased Davis Strait export, and enhanced net sea ice melt could have played an important role in the freshwater trend we observed.