Tropical cyclones(TCs)not only passively respond to climate change,but also play an important role in vertical mixing of the upper ocean and in driving oceanic heat transport.Using a fully coupled climate model,the au...Tropical cyclones(TCs)not only passively respond to climate change,but also play an important role in vertical mixing of the upper ocean and in driving oceanic heat transport.Using a fully coupled climate model,the authors investigate the potential effect of TC-induced vertical mixing on the El Nino–Southern Oscillation(ENSO)and East Asian monsoon in the mid-Piacenzian,during which global TCs are estimated to have been stronger.Sensitivity experiments indicate that the TC-induced oceanic mixing over global storm basins leads to additional warming over the eastern tropical Pacific and a deeper thermocline in the mid-Piacenzian,whereas it dampens the interannual variability of ENSO.Regarding the East Asian monsoon circulations,low-level(850 hPa)summer and winter winds are intensified in response to enhanced vertical mixing,with a southward/westward shift of the western North Pacific high and westerly jet in summer and a deepened East Asian trough in winter.These climatic features are largely reproduced in the experiment with enhanced vertical mixing only over the central-eastern North Pacific.These results may shed light on TC feedbacks associated with vertical mixing and advance our understanding on mid-Piacenzian climate.展开更多
基金funded by the National Natural Science Foundation of China [grant number 41772179]the Young Elite Scientists Sponsorship Program by China Association for Science and Technology [grant number 2017QNRC001]
文摘Tropical cyclones(TCs)not only passively respond to climate change,but also play an important role in vertical mixing of the upper ocean and in driving oceanic heat transport.Using a fully coupled climate model,the authors investigate the potential effect of TC-induced vertical mixing on the El Nino–Southern Oscillation(ENSO)and East Asian monsoon in the mid-Piacenzian,during which global TCs are estimated to have been stronger.Sensitivity experiments indicate that the TC-induced oceanic mixing over global storm basins leads to additional warming over the eastern tropical Pacific and a deeper thermocline in the mid-Piacenzian,whereas it dampens the interannual variability of ENSO.Regarding the East Asian monsoon circulations,low-level(850 hPa)summer and winter winds are intensified in response to enhanced vertical mixing,with a southward/westward shift of the western North Pacific high and westerly jet in summer and a deepened East Asian trough in winter.These climatic features are largely reproduced in the experiment with enhanced vertical mixing only over the central-eastern North Pacific.These results may shed light on TC feedbacks associated with vertical mixing and advance our understanding on mid-Piacenzian climate.
