| XU Shan,LUO Yiyong. 2019. Asymmetric response of the eastern tropical Indian SST to climate warming and cooling. Acta Oceanologica Sinica, 38(5):76－85 |
| Asymmetric response of the eastern tropical Indian SST to climate warming and cooling |
| 热带东印度洋SST对气候变暖和变冷的响应 |
| Received:January 25, 2018 |
| DOI：10.1007/s13131-019-1441-3 |
| Key words:tropical Indian Ocean SST asymmetry climate warming climate cooling negative SST skewness |
| 中文关键词: 热带印度洋 SST非对称性 气候变暖 气候变冷 负的SST偏斜度 |
| 基金项目:The National Natural Science Foundation of China under contract No. 41676002; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11010302. |
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| Abstract: |
| The response of the eastern tropical Indian Ocean (ETIO) to heat fluxes of equal amplitude but opposite sign is investigated using the Community Earth System Model (CESM). A significant positive asymmetry in sea surface temperature (SST) is found over the ETIO—the warming responses to the positive forcing exceeds the cooling to the negative forcing. A mixed layer heat budget analysis is carried out to identify the mechanisms responsible for the SST asymmetry. Results show that it is mainly ascribed to the ocean dynamical processes, including vertical advections and diffusion. The net surface heat flux, on the contrary, works to reduce the asymmetry through its shortwave radiation and latent heat flux components. The former is due to the nonlinear relationship between SST and cloud, while the latter is resulted mainly from Newtonian damping and air-sea stability effects. Changes in the SST skewness are also evaluated, with more enhanced negative SST skewness over the ETIO found for the cooling than heating scenarios due to the asymmetric thermocline-SST feedback. |
| 中文摘要: |
| 本文采用地球气候系统模式CESM，通过在海气界面分别加上和减去6W/m2的热通量来模拟气候变暖和变冷，研究了热带东印度洋对振幅相同、方向相反的气候强迫的响应特征。模式结果表明，热带东印度洋SST存在显著的非对称响应——气候变暖引起的暖异常大于变冷导致的冷异常。混合层热收支分析揭示，海洋动力学过程（主要是垂直对流和扩散）是SST非对称响应的成因，而海气界面的热通量（主要是短波辐射和潜热通量）则对SST的非对称响应起到抑制作用。此外，本文还探讨了东印度洋SST偏斜度的变化：和气候变暖相比，气候变冷情景下负的SST偏斜度显著增加，这主要是因为温跃层-SST反馈的非对称性引起的。 |
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