http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Seo, Jeongbin,Kang, Sarah M.,Merlis, Timothy M. American Geophysical Union 2017 Geophysical research letters Vol.44 No.2
<P>In the present-day climate, the mean Intertropical Convergence Zone (ITCZ) is north of the equator. We investigate changes in the ITCZ latitude under global warming, using multiple atmospheric models coupled to an aquaplanet slab ocean. The reference climate, with a warmer north from prescribed ocean heating, is perturbed by doubling CO2. Most models exhibit a northward ITCZ shift, but the shift cannot be accounted for by the response of energy flux equator where the atmospheric energy transport (F-A) vanishes. The energetics of the simulated circulation shifts are subtle: changes in the efficiency with which the Hadley circulation transports energy, the total gross moist stability (m), dominate over mass flux changes in determining F-A. Even when F-A approximate to 0, the ITCZ can shift significantly due to changes in m, which have often been neglected previously. The dependence of ITCZ responses on m calls for improved understanding of the physics determining the tropical Delta m.</P>
Effects of the Vertical Structure of Polar Warming on the Remote Atmospheric Circulation
Doyeon Kim,Sarah M. Kang,Timothy M. Merlis,Yechul Shin 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
The vertical profile of Arctic warming is determined by various driving mechanisms such as ice albedo feedback, energy transport, and other feedbacks. This study examines remote and local effect of vertical warming structure in the polar region. We apply thermal forcing at different vertical levess in the Northern Hemisphere polar region in two atmospheric global climate models of different complexity, both coupled to an aquaplanet slab ocean. The efficacy of polar heating in perturbing the remote climate increases with the altitude at which it is applied. This robust sensitivity arises from the dominance of surface temperature contribution to the outgoing longwave radiation owing to the large emissivity of the polar troposphere. An upper-level polar heating has a smaller fraction of forcing balanced by radiative flux changes and a larger contribution from atmospheric energy transport changes, which provokes larger shifts in the extratropical jet and Hadley circulation. Our results suggest more far-reaching impacts of Arctic warming owing to seasonally ice-free conditions in the near future.