DOI: 10.1175/JCLI-D-18-0114.1
Scopus记录号: 2-s2.0-85053031732
论文题名: Drivers of the low-cloud response to poleward jet shifts in the North Pacific in observations and models
作者: Zelinka M.D. ; Grise K.M. ; Klein S.A. ; Zhoua C. ; DeAngelisb A.M. ; Christensen M.W.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 19 起始页码: 7925
结束页码: 7947
语种: 英语
英文关键词: Cloud cover
; Cloud radiative effects
; Interannual variability
; Jets
; North Pacific Ocean
; Satellite observations
Scopus关键词: Advection
; Atmospheric temperature
; Boundary layers
; Feedback
; Global warming
; Jets
; Linear regression
; Oceanography
; Surface properties
; Cloud cover
; Cloud radiative effects
; Interannual variability
; North Pacific Ocean
; Satellite observations
; Climate models
英文摘要: The long-standing expectation that poleward shifts of the midlatitude jet under global warming will lead to poleward shifts of clouds and a positive radiative feedback on the climate system has been shown to be misguided by several recent studies. On interannual time scales, free-tropospheric clouds are observed to shift along with the jet, but low clouds increase across a broad expanse of the North Pacific Ocean basin, resulting in negligible changes in total cloud fraction and top-of-atmosphere radiation. Here it is shown that this low-cloud response is consistent across eight independent satellite-derived cloud products. Using multiple linear regression, it is demonstrated that the spatial pattern and magnitude of the low-cloud-coverage response is primarily driven by anomalous surface temperature advection. In the eastern North Pacific, anomalous cold advection by anomalous northerly surface winds enhances sensible and latent heat fluxes from the ocean into the boundary layer, resulting in large increases in low-cloud coverage. Local increases in low-level stability make a smaller contribution to this low-cloud increase. Despite closely capturing the observed response of large-scale meteorology to jet shifts, global climate models largely fail to capture the observed response of clouds and radiation to interannual jet shifts because they systematically underestimate how sensitive low clouds are to surface temperature advection, and to a lesser extent, low-level stability. More realistic model simulations of cloud-radiation-jet interactions require that parameterizations more accurately capture the sensitivity of low clouds to surface temperature advection. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110644
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Lawrence Livermore National Laboratory, Livermore, CA, United States; University of Virginia, Charlottesville, VA, United States; University of California, Los Angeles, Los Angeles, CA, United States; University of Oxford, Oxford, United Kingdom
Recommended Citation:
Zelinka M.D.,Grise K.M.,Klein S.A.,et al. Drivers of the low-cloud response to poleward jet shifts in the North Pacific in observations and models[J]. Journal of Climate,2018-01-01,31(19)