DOI: 10.1175/JCLI-D-17-0627.1
Scopus记录号: 2-s2.0-85048168644
论文题名: Sensitivity of polar amplification to varying insolation conditions
作者: Kim D. ; Kang S.M. ; Shin Y. ; Feldl N.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 12 起始页码: 4933
结束页码: 4947
语种: 英语
英文关键词: Clouds
; Feedback
; General circulation models
; Seasonal cycle
; Stability
; Transport
Scopus关键词: Atmospheric movements
; Clouds
; Convergence of numerical methods
; Incident solar radiation
; Tropics
; Atmospheric energy
; Energy imbalances
; General circulation model
; Insolation conditions
; Long-wave radiation
; Polar amplifications
; Seasonal cycle
; Transport
; Feedback
; albedo
; atmospheric transport
; climate feedback
; cloud radiative forcing
; general circulation model
; global warming
; seasonal variation
; stability analysis
英文摘要: The mechanism of polar amplification in the absence of surface albedo feedback is investigated using an atmospheric model coupled to an aquaplanet slab ocean forced by a CO2 doubling. In particular, we examine the sensitivity of polar surface warming response under different insolation conditions from equinox (EQN) to annual mean (ANN) to seasonally varying (SEA). Varying insolation greatly affects the climatological static stability. The equinox condition, with the largest polar static stability, exhibits a bottom-heavy vertical profile of polar warming response that leads to the strongest polar amplification. In contrast, the polar warming response in ANN and SEA exhibits a maximum in the midtroposphere, which leads to only weak polar amplification. The midtropospheric warming maximum, which results from an increased poleward atmospheric energy transport in response to the tropics-to-pole energy imbalance, contributes to polar surface warming via downward clear-sky longwave radiation. However, it is cancelled by negative cloud radiative feedbacks locally. Furthermore, the polar lapse rate feedback, calculated from radiative kernels, is negative due to the midtropospheric warming maximum, and hence is not able to promote the polar surface warming. On the other hand, the polar lapse rate feedback in EQN is positive due to the bottom-heavy warming response, contributing to the strong polar surface warming. This contrast suggests that locally induced positive radiative feedbacks are necessary for strong polar amplification. Our results demonstrate how interactions among climate feedbacks determine the strength of polar amplification. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111525
Appears in Collections: 气候减缓与适应
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作者单位: School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea; Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA, United States
Recommended Citation:
Kim D.,Kang S.M.,Shin Y.,et al. Sensitivity of polar amplification to varying insolation conditions[J]. Journal of Climate,2018-01-01,31(12)