Enhanced upper ocean stratification with climate change in the CMIP3 models
Enhanced upper ocean stratification with climate change in the CMIP3 models
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DOI：
10.1029/2011jc007409
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发表时间：
2012-04-25
影响因子：
3.6
通讯作者：
Scott, James D.
中科院分区：
文献类型：
--
作者：
Capotondi, Antonietta;Alexander, Michael A.;Scott, James D.
根据SRES-A2场景，在CMIP3气候模型的十个中，对21世纪下半叶的上海分层的变化进行了检查。在这里定义为200 m和表面之间的密度差的上海分层在21世纪下半叶到处都更大，这表明表面和更深的海洋之间的脱钩程度越来越高，对许多人都有重要的后果生物地球化学过程。分层变化最大的区域包括北极，热带，北大西洋和东北太平洋。分层的增加主要是由于表面温度的升高，其对热带区域的密度影响最大，并且随着纬度的增加而减少。在北极，北大西洋和东北太平洋地区，盐度对分层变化的影响虽然不如温度那么广泛。盐度还显着导致西部热带太平洋表面附近的密度下降，但抵消了温度对热带大西洋密度的负面影响。
Changes in upper ocean stratification during the second half of the 21st century, relative to the second half of the 20th century, are examined in ten of the CMIP3 climate models according to the SRES-A2 scenario. The upper ocean stratification, defined here as the density difference between 200 m and the surface, is larger everywhere during the second half of the 21st century, indicative of an increasing degree of decoupling between the surface and the deeper oceans, with important consequences for many biogeochemical processes. The areas characterized by the largest stratification changes include the Arctic, the tropics, the North Atlantic, and the northeast Pacific. The increase in stratification is primarily due to the increase in surface temperature, whose influence upon density is largest in the tropical regions, and decreases with increasing latitude. The influence of salinity upon the stratification changes, while not as spatially extensive as that of temperature, is very large in the Arctic, North Atlantic and Northeast Pacific. Salinity also significantly contributes to the density decrease near the surface in the western tropical Pacific, but counteracts the negative influence of temperature upon density in the tropical Atlantic.