Variability of atlantic meridional overturning circulation in FGOALS-g2

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• 作者：Wenyu Huang (1)
  Bin Wang (1) (2)
  Lijuan Li (2)
  Li Dong (2)
  Pengfei Lin (2)
  Yongqiang Yu (2)
  Tianjun Zhou (2)
  Li Liu (1)
  Shiming Xu (1)
  Kun Xia (1)
  Ye Pu (2)
  Lu Wang (2)
  Mimi Liu (2)
  Si Shen (2)
  Ning Hu (2)
  Yong Wang (2)
  Wenqi Sun (2)
  Fang Dong (1)
  
• 关键词：AMOC ; decadal variability ; deep convection ; FGOALS ; g2
• 刊名：Advances in Atmospheric Sciences
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：31
• 期：1
• 页码：95-109
• 全文大小：
• 作者单位：Wenyu Huang (1)
  Bin Wang (1) (2)
  Lijuan Li (2)
  Li Dong (2)
  Pengfei Lin (2)
  Yongqiang Yu (2)
  Tianjun Zhou (2)
  Li Liu (1)
  Shiming Xu (1)
  Kun Xia (1)
  Ye Pu (2)
  Lu Wang (2)
  Mimi Liu (2)
  Si Shen (2)
  Ning Hu (2)
  Yong Wang (2)
  Wenqi Sun (2)
  Fang Dong (1)
  
  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
  
• ISSN：1861-9533

文摘

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.