DOI: 10.1007/s00382-015-2926-1
Scopus记录号: 2-s2.0-84949568449
论文题名: Influence of altered low cloud parameterizations for seasonal variation of Arctic cloud amount on climate feedbacks
作者: Kim Y. ; Choi Y.-S. ; Kim B.-M. ; Kim H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-05-06 起始页码: 1661
结束页码: 1672
语种: 英语
英文关键词: Arctic cloud parameterization
; Climate model feedback
; Radiative kernels
英文摘要: This study investigates the alteration of climate feedbacks due to overestimated wintertime low-level cloud amount bias over the Arctic region (60°N–90°N) in a climate model. The climate feedback was quantitatively examined through radiative kernels that are pre-calculated radiative responses of climate variables to doubling of carbon dioxide concentration in NCAR Community Atmosphere Model version 3 (CAM3). Climate models have various annual cycle of the Arctic cloud amount at the low-level particularly with large uncertainty in winter and CAM3 may tend to overestimate the Arctic low-level cloud. In this study, the seasonal variation of low-level cloud amount was modified by reducing the wintertime cloud amount by up to 35 %, and then compared with the original without seasonal variation. Thus, we investigate how that bias may affect climate feedbacks and the projections of future Arctic warming. The results show that the decrease in low-level cloud amount slightly affected the radiation budgets because of a small amount of incident solar insolation in winter, but considerably changed water vapor and temperature profiles. Consequently, the most distinctive was decreases in water vapor feedback and contribution of heat transport (by −0.20 and −0.55 W m−2 K−1, respectively) and increases in the lapse rate feedback and cloud feedback (by 0.13 and 0.58 W m−2 K−1, respectively) during winter in this model experiment. This study suggests that the change in Arctic cloud amount effectively reforms the contributions of individual climate feedbacks to Arctic climate system and leads to opposing effects on different feedbacks, which cancel out in the model. © 2015, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53547
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Climate Research Department, APEC Climate Center, Busan, South Korea; Department of Atmospheric Science and Engineering, Ewha Womans University, Seoul, South Korea; Korea Polar Research Institute, Incheon, South Korea; Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea; Department of Environmental Science and Engineering, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul, South Korea
Recommended Citation:
Kim Y.,Choi Y.-S.,Kim B.-M.,et al. Influence of altered low cloud parameterizations for seasonal variation of Arctic cloud amount on climate feedbacks[J]. Climate Dynamics,2016-01-01,47(2017-05-06)