서울대학교 지구환경과학부 BK21 PLUS

전체메뉴
 
HOME>학부정보실>세미나

세미나

세미나 상세보기 입니다.
발표자 김백민 박사
소속 극지연구소
제목 Does the Atlantic windstorms have significant influences on the Arctic warming?
문의처 박성수 교수 (02-880-6717)
자료 snutalk_bmkim.doc [28672 byte] 자료 다운로드
시간 2017-09-19 11:00~12:00
장소 501동 504호
내용요약

Over the past decades, the Arctic lower surface temperature has been increased at a rate over two to three times of the global mean surface temperature and this is the reason why we refer this phenomena as the Arctic amplification. Associated with this distinguished warming trend, extreme Arctic warming episodes are also increased. During the northern winter, strong Atlantic windstorms often intrude into the Arctic and play important roles as a moisture supplier into the Arctic. Recent unprecedented Arctic warming event happened in early January of 2016 is the best example: In this episode, the Atlantic sector of Arctic experienced tremendous warming more than 25 DegC than its daily climatology due to the entry of strong Atlantic windstorm of 950 hPa as its central pressure. However, quantitative assessments on the role of Atlantic windstorms on the Arctic warming episodes are rare in the current literatures. Here we provide robust statistical evidences that strong Atlantic windstorms tend to move northeastward to the Arctic and induce significant Arctic warming. Positive North Atlantic Oscillation (NAO) condition and, thus, intensified upper-level winds and tropospheric instability contribute favorable conditions for the intensification of the stronger storms. Enhanced poleward energy transport by moisture intrusion is observed during the lifecycle of the Atlantic windstorms of strongest 10-20% category. The increase of Arctic temperature critically depends on the strength of storm. This linkage between strong Atlantic windstorms and Arctic warming events are well simulated by the two independent climate model simulations.

    

비고
전공 대기