DOI: 10.1175/JCLI-D-17-0710.1
Scopus记录号: 2-s2.0-85047061700
论文题名: Spring Arctic atmospheric preconditioning: Do not rule out shortwave radiation just yet
作者: Sedlar J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 11 起始页码: 4225
结束页码: 4240
语种: 英语
英文关键词: Albedo
; Cloud cover
; Energy budget/balance
; Ice loss/growth
; Radiative fluxes
; Shortwave radiation
Scopus关键词: Budget control
; Sea ice
; Albedo
; Cloud cover
; Energy budget/balance
; Ice loss/growth
; Radiative fluxes
; Short-wave radiation
; Incident solar radiation
英文摘要: Springtime atmospheric preconditioning of Arctic sea ice for enhanced or buffered sea ice melt during the subsequent melt year has received considerable research focus. Studies have identified enhanced poleward atmospheric transport of moisture and heat during spring, leading to increased emission of longwave radiation to the surface. Simultaneously, these studies ruled out the role of shortwave radiation as an effective preconditioning mechanism because of relatively weak incident solar radiation, high surface albedo from sea ice and snow, and increased clouds during spring. These conclusions are derived primarily from atmospheric reanalysis, which may not always accurately represent the Arctic climate system. Here, top-of-atmosphere shortwave radiation observations from a state-of-the-art satellite sensor are compared with ERA-Interim reanalysis to examine similarities and differences in the springtime absorbed shortwave radiation (ASR) over the Arctic Ocean. Distinct biases in regional location and absolute magnitude of ASR anomalies are found between satellite-based measurements and reanalysis. Observations indicate separability between ASR anomalies in spring corresponding to anomalously low and high ice extents in September; the reanalysis fails to capture the full extent of this separability. The causes for the difference in ASR anomalies between observations and reanalysis are considered in terms of the variability in surface albedo and cloud presence. Additionally, biases in reanalysis cloud water during spring are presented and are considered for their impact on overestimating spring downwelling longwave anomalies. Taken together, shortwave radiation should not be overlooked as a contributing mechanism to springtime Arctic atmospheric preconditioning. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111515
Appears in Collections: 气候减缓与适应
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作者单位: Department of Meteorology, Stockholm University, Stockholm, Sweden; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Sedlar J.. Spring Arctic atmospheric preconditioning: Do not rule out shortwave radiation just yet[J]. Journal of Climate,2018-01-01,31(11)