DOI: 10.1175/JCLI-D-17-0592.1
Scopus记录号: 2-s2.0-85052927027
论文题名: A climatology of strong large-scale ocean evaporation events. Part II: Relevance for the deuterium excess signature of the evaporation flux
作者: Aemisegger F. ; Sjolte J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 18 起始页码: 7313
结束页码: 7336
语种: 英语
英文关键词: Air-sea interaction
; Evaporation
; Extratropical cyclones
; Water vapor
Scopus关键词: Boundary layers
; Evaporation
; Moisture control
; Potential flow
; Precipitation (meteorology)
; Storms
; Surface waters
; Water vapor
; Air sea interactions
; Extratropical cyclones
; Fractionation factors
; Low relative humidities
; Marine boundary layers
; Negative correlation
; Sea surface temperature (SST)
; Theoretical framework
; Oceanography
英文摘要: This paper discusses the relevance of transient events of strong large-scale ocean evaporation (SLOE) for the deuteriumexcess of marine boundary layer vapor d using a theoretical framework that invokes the closure assumption. We argue that during SLOE events, d is essentially determined by the evaporation flux signature. Distinct high d during SLOE with global-mean values in the range of 12‰-23‰ depending on the nonequilibrium fractionation factor αk result from the large air-sea humidity gradients reflected in low relative humidity with respect to sea surface temperature (hs 5 53% ± 9%) that characterize these events. Extratropical cyclones are highlighted as an important driver for the variability of d. On the one hand, they are themselves associated with high hs and low d, especially in areas of cloud formation and precipitation in the warm sector. On the other hand, cyclones are the main driver inducing SLOE events with high d in regions of cold-air advection upstream of their path. The sensitivity of d to its direct climate controls (hs and SST) is analyzed during SLOE for different αk formulations and found to be coherent with d-hs and d-SST slopes determined from available observations. The d-hs relationship exhibits a robust negative correlation as opposed to the d-SST relationship, which shows regional and time-scale-dependent variations in strength and sign that are induced by indirect hs-SST cross-correlation effects. The dynamical features involved in SLOE generation appear to exert a key control on the moisture source properties relevant for d in the extratropics. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111382
Appears in Collections: 气候减缓与适应
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作者单位: Centre for Environmental and Climate Research, Lund University, Lund, Sweden; Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland; Department of Geology Quaternary Science, Lund University, Lund, Sweden
Recommended Citation:
Aemisegger F.,Sjolte J.. A climatology of strong large-scale ocean evaporation events. Part II: Relevance for the deuterium excess signature of the evaporation flux[J]. Journal of Climate,2018-01-01,31(18)