DOI: 10.1002/2016MS000872
Scopus记录号: 2-s2.0-85019111827
论文题名: Cloud and circulation feedbacks in a near-global aquaplanet cloud-resolving model
作者: Narenpitak P ; , Bretherton C ; S ; , Khairoutdinov M ; F
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 2 起始页码: 1069
结束页码: 1090
语种: 英语
英文关键词: Atmospheric temperature
; Boundary layers
; Carbon dioxide
; Climate models
; Humidity control
; Oceanography
; Probability distributions
; Surface waters
; Cloud feedbacks
; Cloud resolving model
; Cumulus parameterization
; Horizontal resolution
; Intertropical convergence zone
; Mid-latitude clouds
; Sea surface temperature (SST)
; Tropical channel
; Tropics
; boundary layer
; cloud cover
; cooling
; numerical model
; rainfall
; relative humidity
; sea surface temperature
; subtropical region
; water content
英文摘要: A near-global aquaplanet cloud-resolving model (NGAqua) with fixed meridionally varying sea-surface temperature (SST) is used to investigate cloud feedbacks due to three climate perturbations: a uniform 4 K SST increase, a quadrupled-CO2 concentration, and both combined. NGAqua has a horizontal resolution of 4 km with no cumulus parameterization. Its domain is a zonally periodic 20,480 km-long tropical channel, spanning 46°S–N. It produces plausible mean distributions of clouds, rainfall, and winds. After spin-up, 80 days are analyzed for the control and increased-SST simulations, and 40 days for those with quadrupled CO2. The Intertropical Convergence Zone width and tropical cloud cover are not strongly affected by SST warming or CO2 increase, except for the expected upward shift in high clouds with warming, but both perturbations weaken the Hadley circulation. Increased SST induces a statistically significant increase in subtropical low cloud fraction and in-cloud liquid water content but decreases midlatitude cloud, yielding slightly positive domain-mean shortwave cloud feedbacks. CO2 quadrupling causes a slight shallowing and a statistically insignificant reduction of subtropical low cloud fraction. Warming-induced low cloud changes are strongly correlated with changes in estimated inversion strength, which increases modestly in the subtropics but decreases in the midlatitudes. Enhanced clear-sky boundary layer radiative cooling in the warmer climate accompanies the robust subtropical low cloud increase. The probability distribution of column relative humidity across the tropics and subtropics is compared between the control and increased-SST simulations. It shows no evidence of bimodality or increased convective aggregation in a warmer climate. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75791
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, United States
Recommended Citation:
Narenpitak P,, Bretherton C,S,et al. Cloud and circulation feedbacks in a near-global aquaplanet cloud-resolving model[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(2)