Development of warm SST errors in the southern tropical Atlantic in CMIP5 decadal hindcasts

Development of warm SST errors in the southern tropical Atlantic in CMIP5 decadal hindcasts
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CMIP5 十年后报中热带大西洋南部暖海温误差的发展

DOI:
10.1007/s00382-013-1691-2
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Toniazzo T
Toniazzo T
中科院分区:
地球科学2区
文献类型:
--
作者:
Toniazzo T

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在环流耦合模式中,热带大西洋的海温误差是大而系统的。我们分析了这些误差在热带大西洋东南部地区的增长,这些误差是在参与耦合模式相互比较项目5的三个模式的初始年代际预测整合中增加的。确定了造成最初偏置发展的各种原因,但在所有考虑的情况下,发现维持偏置的关键因素是海洋-大气耦合。这包括在赤道和本格拉-安哥拉沿海海域之间的海洋“桥梁”,它传达了地下海洋异常现象,并构成了热带大西洋东南部海温和赤道上空风之间的耦合。由此产生的海温、风和降水之间的耦合代表了热带大西洋东南部温暖海温误差的正反馈。
SST errors in the tropical Atlantic are large and systematic in current coupled general-circulation models. We analyse the growth of these errors in the region of the south-eastern tropical Atlantic in initialised decadal hindcasts integrations for three of the models participating in the Coupled Model Inter-comparison Project 5. A variety of causes for the initial bias development are identified, but a crucial involvement is found, in all cases considered, of ocean-atmosphere coupling for their maintenance. These involve an oceanic “bridge” between the Equator and the Benguela-Angola coastal seas which communicates sub-surface ocean anomalies and constitutes a coupling between SSTs in the south-eastern tropical Atlantic and the winds over the Equator. The resulting coupling between SSTs, winds and precipitation represents a positive feedback for warm SST errors in the south-eastern tropical Atlantic.
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