DOI: 10.1002/2017JD027796
Scopus记录号: 2-s2.0-85047468528
论文题名: Foehn Event Triggered by an Atmospheric River Underlies Record-Setting Temperature Along Continental Antarctica
作者: Bozkurt D. ; Rondanelli R. ; Marín J.C. ; Garreaud R.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 8 起始页码: 3871
结束页码: 3892
语种: 英语
英文关键词: atmospheric river
; climate variability
; extreme high temperature
; foehn wind
; meteorology
; regional climate modeling
Scopus关键词: advection
; atmospheric moisture
; climate change
; climate modeling
; extreme event
; foehn
; high temperature
; ice shelf
; meteorology
; MODIS
; regional climate
; temperature
; Amundsen Sea
; Antarctic Peninsula
; Antarctica
; Bellingshausen Sea
; Pacific Ocean
; Pacific Ocean (Southeast)
; Southern Ocean
; West Antarctica
; Esperanza
英文摘要: A record-setting temperature of 17.5°C occurred on 24 March 2015 at the Esperanza station located near the northern tip of the Antarctic Peninsula (AP). We studied the event using surface station data, satellite imagery, reanalysis data, and numerical simulations. The Moderate Resolution Imaging Spectroradiometer Antarctic Ice Shelf Image Archive provides clear evidence for disintegration and advection of sea ice, as well as the formation of melt ponds on the ice sheet surface at the base of the AP mountain range. A deep low-pressure center over the Amundsen-Bellingshausen Sea and a blocking ridge over the southeast Pacific provided favorable conditions for the development of an atmospheric river with a northwest-southeast orientation, directing warm and moist air toward the AP, and triggering a widespread foehn episode. A control simulation using a regional climate model shows the existence of local topographically induced warming along the northern tip of the AP (∼60% of the full temperature signal) and the central part of the eastern AP (90% of the full temperature signal) with respect to a simulation without topography. These modeling results suggest that more than half of the warming experienced at Esperanza can be attributed to the foehn effect (a local process), rather than to the large-scale advection of warm air from the midlatitudes. Nevertheless, the local foehn effect also has a large-scale advection component, since the atmospheric river provides water vapor for orographic precipitation enhancement and latent heat release, which makes it difficult to completely disentangle the role of local versus large-scale processes in explaining the extreme event. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114072
Appears in Collections: 气候减缓与适应
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作者单位: Center for Climate and Resilience Research, University of Chile, Santiago, Chile; Department of Geophysics, University of Chile, Santiago, Chile; Department of Meteorology, University of Valparaiso, Valparaiso, Chile; Interdisciplinary Center for Atmospheric and Astro-statistical Studies, University of Valparaiso, Valparaiso, Chile
Recommended Citation:
Bozkurt D.,Rondanelli R.,Marín J.C.,et al. Foehn Event Triggered by an Atmospheric River Underlies Record-Setting Temperature Along Continental Antarctica[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(8)