| 热带东印度洋SST对气候变暖和变冷的响应 |
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| 引用本文： | 徐杉,罗义勇. 热带东印度洋SST对气候变暖和变冷的响应[J]. 海洋学报(英文版), 2019, 38(5): 76-85. DOI: 10.1007/s13131-019-1441-3 |
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| 作者姓名： | 徐杉 罗义勇 |
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| 作者单位： | 中国海洋大学海洋与大气学院, 青岛, 266100;中国海洋大学物理海洋教育部重点实验室, 青岛, 266100,中国海洋大学物理海洋教育部重点实验室, 青岛, 266100 |
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| 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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| 摘 要： | 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.
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| 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 |
| 收稿时间： | 2018-01-25 |
Asymmetric response of the eastern tropical Indian SST to climate warming and cooling |
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| XU Shan and LUO Yiyong. Asymmetric response of the eastern tropical Indian SST to climate warming and cooling[J]. Acta Oceanologica Sinica, 2019, 38(5): 76-85. DOI: 10.1007/s13131-019-1441-3 |
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| Authors: | XU Shan and LUO Yiyong |
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| Affiliation: | 1.College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China2.Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China |
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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. |
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| Keywords: | tropical Indian Ocean SST asymmetry climate warming climate cooling negative SST skewness |
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