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【学术报告】Dr.Maofeng Liu,Department of Civil and Environmental Engineering, Princeton University, USA

报告题目:A hydroclimatological perspective on landfalling hurricanes in the North Atlantic

 

    人:Maofeng Liu

 

        位:Department of Civil and Environmental Engineering, Princeton University

 

        间:201569日上午10:00

 

        点:大气所40号楼319会议室

 

The extratropical transition (ET) process of hurricanes can lead to fundamental changes on

hurricane structures. Particularly, many landfalling hurricanes experience ET and change from

the tropical cyclone (TC) stage to the extratropical cyclone (EX) stages. The first part of this

study focuses on the impact of ET on landfalling hurricane rainfall in the North Atlantic Basin.

35 U.S. landfalling hurricanes from 2002 to 2012 are analyzed. Hurricanes before and after ET

show contrasting rainfall distributions. From the TC stage to the EX stage, the symmetric rainfall

distribution around the storm center shifts to the front-left quadrant. The location of maximum

rainfall extends from ~100 km to 200-300 km from the storm center and the rainfall coverage

area substantially increases after ET, indicating larger impacting areas. For hurricanes located

at the poleward side of N35o, hurricanes that experience ET produce stronger rainfall than those

that do not, suggesting significant influence of ET on TC rainfall production. Further analyses

show that the phasing between midlatitude trough system and hurricanes plays an important

role in ET-induced rainfall pattern and amount.

 

Given the importance of ET, it is necessary to understand how ET changes under a warming

climate. Towards this goal, we first simulate the current-day ET climatology with the GFDL

climate model and compare it with observation in the North Atlantic Basin. The model shows

good capabilities in capturing the ET climatology in terms of ET track patterns, ET locations

and monthly ET variations. Future work involves examining changes in the ET climatology

under a changing climate.

 


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