| Variability of Atlantic Meridional Overturning Circulation in FGOALS-g2简 |
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| 作者姓名： | HUANG Wenyu WANG Bin LI Lijuan DONG Li LIN Pengfei YU Yongqiang ZHOU Tianjun LIU Li XU Shiming XIA Kun PU Ye WANG Lu LIU Mimi SHEN Si HU Ning WANG Yong SUN Wenqi DONG Fang |
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| 基金项目： | supported by the Ministry of Science and Technology of China for the National Hightech R&;D Program(863 Program;Grant No.2010AA012304);the National Basic Research Program of China(973 Program;Grant Nos.2011CB309704 and 2010CB951904);the National Natural Science Foundation of China(Grant Nos.41023002 and 41005053) |
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| 摘 要： | The variability of Atlantic Meridional Overturning Circulation （AMOC） in the pre-industrial control experiment of the Flexible Global Ocean-Atmosphere-Land System model, Grid-point Version 2 （FGOALS-g2） was investigated using the model outputs with the most stable state in a 512-yr time window from the total 1500-yr period of the experiment. The period of AMOC in FGOALS-g2 is double peaked at 20 and 32 years according to the power spectrum, and 22 years according to an auto-correlation analysis, which shows very obvious decadal variability. Like many other coupled climate models, the decadal variability of AMOC in FGOALS-g2 is closely related to the convection that occurs in the Labrador Sea region. Deep convection in the Labrador Sea in FGOALS-g2 leads the AMOC maximum by 3-4 years. The contributions of thermal and haline effects to the variability of the convection in three different regions the Labrador, Irminger and Greenland-Iceland- Norwegian （GIN） Seas] were analyzed for FGOALS-g2. The variability of convection in the Labrador and Irminger Seas is thermally dominant, while that in the colder GIN Seas can be mainly attributed to salinity changes due to the lower thermal expansion. By comparing the simulation results from FGOALS-g2 and 11 other models, it was found that AMOC variability can be attributed to salinity changes for longer periods （longer than 35 years） and to temperature changes for shorter periods.
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| 关 键 词： | 大西洋 变异 环流 翻转 拉布拉多海 年代际变化 时间窗口 对照实验 |
Variability of atlantic meridional overturning circulation in FGOALS-g2 |
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| HUANG Wenyu,WANG Bin,LI Lijuan,DONG Li,LIN Pengfei,YU Yongqiang,ZHOU Tianjun,LIU Li,XU Shiming,XIA Kun,PU Ye,WANG Lu,LIU Mimi,SHEN Si,HU Ning,WANG Yong,SUN Wenqi,DONG Fang.Variability of atlantic meridional overturning circulation in FGOALS-g2[J].Advances in Atmospheric Sciences,2014,31(1):95-109. |
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| Authors: | Wenyu Huang Bin Wang Lijuan Li Li Dong Pengfei Lin Yongqiang Yu Tianjun Zhou Li Liu Shiming Xu Kun Xia Ye Pu Lu Wang Mimi Liu Si Shen Ning Hu Yong Wang Wenqi Sun Fang Dong |
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| Institution: | 1. Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing, 100084, China
2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
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| Abstract: | The variability of Atlantic Meridional Overturning Circulation (AMOC) in the pre-industrial control experiment of the Flexible Global Ocean-Atmosphere-Land System model, Grid-point Version 2 (FGOALS-g2) was investigated using the model outputs with the most stable state in a 512-yr time window from the total 1500-yr period of the experiment. The period of AMOC in FGOALS-g2 is double peaked at 20 and 32 years according to the power spectrum, and 22 years according to an auto-correlation analysis, which shows very obvious decadal variability. Like many other coupled climate models, the decadal variability of AMOC in FGOALS-g2 is closely related to the convection that occurs in the Labrador Sea region. Deep convection in the Labrador Sea in FGOALS-g2 leads the AMOC maximum by 3–4 years. The contributions of thermal and haline effects to the variability of the convection in three different regions the Labrador, Irminger and Greenland-Iceland-Norwegian (GIN) Seas] were analyzed for FGOALS-g2. The variability of convection in the Labrador and Irminger Seas is thermally dominant, while that in the colder GIN Seas can be mainly attributed to salinity changes due to the lower thermal expansion. By comparing the simulation results from FGOALS-g2 and 11 other models, it was found that AMOC variability can be attributed to salinity changes for longer periods (longer than 35 years) and to temperature changes for shorter periods. |
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| Keywords: | AMOC decadal variability deep convection FGOALS-g |
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