Effects of Model Resolution, Physics, and Coupling on Southern Hemisphere Storm Tracks in CESM1.3
Effects of Model Resolution, Physics, and Coupling on Southern Hemisphere Storm Tracks in CESM1.3
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DOI：
10.1029/2019gl084057
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发表时间：
2019-11-07
影响因子：
5.2
通讯作者：
Danabasoglu, Gokhan
中科院分区：
文献类型：
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作者：
Meehl, Gerald A.;Yang, Dongxia;Danabasoglu, Gokhan
将耦合地球系统模型的两个高分辨率版本(CESM1.3：0.25度大气，1度海洋；CESM1.1：0.25度大气，0.1度海洋)与标准分辨率CESM1.1和CESM1.3(1度大气，1度海洋)进行了比较。记录了CESM1.3版本，并研究了模式分辨率、海气耦合和大气模式中的物理因素对以850百帕涡动动能表示的南半球风暴路径的影响。将大气中的分辨率从1度增加到0.25度，再加上海洋中的1度，风暴路径的强度会更接近观测。与CESM1.3物理耦合到1度海洋的0.25度大气相比，较早的CESM1.1物理耦合到0.1度海洋的0.25度大气有更少的低云，更温暖的南大洋海面温度，更弱的经向温度梯度，以及退化的风暴路径模拟。因此，大气模式中的物理缺陷可能会抵消大气和海洋中更高分辨率所取得的成果。
Two high-resolution versions of a Coupled Earth System Model (CESM1.3: 0.25 degrees atmosphere, 1 degrees ocean; CESM1.1: 0.25 degrees atmosphere, 0.1 degrees ocean) are compared to the standard resolution CESM1.1 and CESM1.3 (1 degrees atmosphere, 1 degrees ocean). The CESM1.3 versions are documented, and the consequences of model resolution, air-sea coupling, and physics in the atmospheric models are studied with regard to storm tracks in the Southern Hemisphere as represented by 850-hPa eddy kinetic energy. Increasing the resolution from 1 degrees to 0.25 degrees in the atmosphere (same physics) coupled to the 1 degrees ocean intensifies the strength of the storm tracks closer to observations. The 0.25 degrees atmosphere with the older CESM1.1 physics coupled to the 0.1 degrees ocean has fewer low clouds, warmer Southern Ocean sea surface temperatures, a weaker meridional temperature gradient, and a degraded storm track simulation compared to the 0.25 degrees atmosphere with CESM1.3 physics coupled to the 1 degrees ocean. Therefore, deficient physics in the atmospheric model can negate the gains attained by higher resolution in atmosphere and ocean.