| Effect of Chlorophyll-a Spatial Distribution on Upper Ocean Temperature in the Central and Eastern Equatorial Pacific |
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| 作者姓名： | 林鹏飞 刘海龙 张学洪 |
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| 作者单位： | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics，Chinese Academy of Sciences，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics，Institute of Atmospheric Physics，Chinese Academy of Sciences，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029 Graduate University of Chinese Academy of Sciences，Beijing 100049，Beijing 100029，Beijing 100029 |
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| 基金项目： | 国家自然科学基金，the NationM Key Programme，the Chinese Academy of Sciences(CAS)International Partnership Creative Group |
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| 摘 要： | Effect of the spatial distributions of chlorophyll-a concentration on upper ocean temperature and currents in the equatorial Pacific is investigated through a set of numerical experiments by using an ocean general circulation model. This study indicates that enhanced meridional gradient of chlorophyll-a between the equator and off-equatorial regions can strengthen zonal circulation and lead to a decrease in equatorial sea surface temperature （SST）. However, the circulation changes by themselves are not effective enough to affect SST in the equatorial cold tongue （CT） region. The comparison between the experiments indicates that the CT SST are more sensitive to chlorophyll-a distribution away from the equator. The off-equatorial chlorophyll-a traps more solar radiation in the mixed layer, therefore, the temperature in the thermoeline decreases. The cold water can then be transported to the equator by the meridional circulation within the mixed layer. Furthermore, the relation among CT SST, the surface heat flux, and the equatorial upwelling are discussed. The study implies the simulation biases of temperature on the equator are not only related to the local ocean dynamics but also related to some deficiency in simulating off-equatorial processes.
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| 关 键 词： | 太平洋 海洋表面温度 赤道 叶绿素-a |
| 收稿时间： | 24 April 2007 |
Effect of chlorophyll-a spatial distribution on upper ocean temperature in the central and eastern equatorial Pacific |
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| Pengfei?Lin,Hailong?Liu,Xuehong?Zhang.Effect of Chlorophyll-a Spatial Distribution on Upper Ocean Temperature in the Central and Eastern Equatorial Pacific[J].Advances in Atmospheric Sciences,2008,25(4):585-596. |
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| Authors: | Pengfei Lin Hailong Liu Xuehong Zhang |
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| Institution: | [1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 [2]Graduate University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | Effect of the spatial distributions of chlorophyll-a concentration on upper ocean temperature and currents in the equatorial Pacific is investigated through a set of numerical experiments by using an ocean general circulation model. This study indicates that enhanced meridional gradient of chlorophylloa between the equator and off-equatorial regions can strengthen zonal circulation and lead to a decrease in equatorial sea surface temperature (SST). However, the circulation changes by themselves are not effective enough to affect SST in the equatorial cold tongue (CT) region. The comparison between the experiments indicates that the CT SST are more sensitive to chlorophyll-a distribution away from the equator. The off-equatorial chlorophyll-a traps more solar radiation in the mixed layer, therefore, the temperature in the thermocline decreases. The cold water can then be transported to the equator by the meridional circulation within the mixed layer. Furthermore, the relation among CT SST, the surface heat flux, and the equatorial upwelling are discussed. The study implies the simulation biases of temperature on the equator are not only related to the local ocean dynamics but also related to some deficiency in simulating off-equatorial processes. |
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| Keywords: | sea surface temperature the equatorial cold tongue chlorophyll-a |
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