Observed temperature trends in the Indian Ocean over 1960-1999 and associated mechanisms
Observed temperature trends in the Indian Ocean over 1960-1999 and associated mechanisms
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DOI：
10.1029/2006gl028044
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发表时间：
2007-01-20
影响因子：
5.2
通讯作者：
Meyers, Gary
中科院分区：
文献类型：
--
作者：
Alory, Gael;Wijffels, Susan;Meyers, Gary
[1]1960年至1999年海洋温度的线性趋势是使用新的印度洋热档案（IOTA），一个历史温度剖面汇编估计的。广泛的地表变暖被发现，在其他数据集，并再现在政府间气候变化专门委员会气候模型模拟的世纪。这种变暖在亚热带地区特别大，并延伸到800米左右的40-50度S。模型表明，深层次的副热带变暖与西风加强驱动的副热带环流向南移动0.5度有关，并与南方环形模式指数的上升趋势有关。在热带地区，IOTA显示了次表层冷却，对应于温跃层变浅和垂直分层增加。大多数模型表明，热带印度温跃层的这种趋势可能与观察到的太平洋信风减弱有关，并通过印度尼西亚的通流传播到印度洋。
[1] The linear trends in oceanic temperature from 1960 to 1999 are estimated using the new Indian Ocean Thermal Archive (IOTA), a compilation of historical temperature profiles. Widespread surface warming is found, as in other data sets, and reproduced in IPCC climate model simulations for the 20th century. This warming is particularly large in the subtropics, and extends down to 800 m around 40-50 degrees S. Models suggest the deep-reaching subtropical warming is related to a 0.5 degrees southward shift of the subtropical gyre driven by a strengthening of the westerly winds, and associated with an upward trend in the Southern Annular Mode index. In the tropics, IOTA shows a subsurface cooling corresponding to a shoaling of the thermocline and increasing vertical stratification. Most models suggest this trend in the tropical Indian thermocline is likely associated with the observed weakening of the Pacific trade winds and transmitted to the Indian Ocean by the Indonesian throughflow.