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Special Session 5: Ocean-atmosphere interaction, multi-scale climate variability and their implication for biogeochemical processes |
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Responses of the summertime subtropical anticyclones to global warming
Tuesday 10th @ 1545-1605
Room 1
Chao He* , Institute of Tropical and Marine Meteorology, China Meteorological Administration
Bo Wu, Institute of Atmospheric Physics, Chinese Academy of Sciences
Liwei Zou, Institute of Atmospheric Physics, Chinese Academy of Sciences
Tianjun Zhou, Institute of Atmospheric Physics, Chinese Academy of Sciences
Presenter Email: hechao@mail.iap.ac.cn
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| Subtropical anticyclones dominate the subtropical ocean basins in summer. Using the multi-model outputs from the Coupled Model Intercomparison Project Phase 5 (CMIP5), we investigated the future changes of the subtropical anticyclones as a response to global warming. Based on the model projected changes in subsidence, low-level divergence and rotational wind, the subtropical anticyclones over the North Pacific, South Pacific, South Atlantic and South Indian Ocean are weakened, whereas the North Atlantic subtropical anticyclone (NASA) is intensified and shifted northwestward. Both diagnostic analyses and idealized model simulations suggest that the increased tropospheric static stability is responsible for the reduced intensities of the subtropical anticyclones, and the mean advection of stratification change (MASC) connects the increased static stability with the reduced intensities of the subtropical anticyclones. Over the North Atlantic Ocean, although MASC still acts to weaken the NASA, the combined effect of increased static stability and decreased latent heating strengthens it and shifts it northwestward. |
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