DOI: 10.1002/joc.5180
论文题名: Assessing the climatic and environmental impacts of mid-tropospheric anticyclones over Alaska
作者: McLeod J.T. ; Ballinger T.J. ; Mote T.L.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 1 起始页码: 351
结束页码: 364
语种: 英语
英文关键词: Alaska
; Arctic amplification
; atmospheric blocking
; teleconnections
Scopus关键词: Atmospheric movements
; Atmospheric pressure
; Atmospheric temperature
; Climate change
; Oscillating flow
; Troposphere
; Alaska
; Atmospheric blocking
; Atmospheric circulation
; Near surface air temperature
; Pacific decadal oscillation
; Sea surface temperature (SST)
; Teleconnections
; Tropospheric circulation
; Environmental impact
; anticyclone
; atmospheric blocking
; atmospheric circulation
; atmospheric forcing
; climate change
; environmental impact
; Northern Hemisphere
; Pacific Decadal Oscillation
; sea surface temperature
; spatiotemporal analysis
; teleconnection
; troposphere
; Alaska
; Arctic Ocean
; Pacific Ocean
; United States
英文摘要: Ongoing climatic and cryospheric changes observed throughout the greater Alaska region are interconnected and often linked to oceanic and atmospheric patterns and processes that operate on varying spatiotemporal scales. To evaluate the long-term, mid-tropospheric circulation field across Alaska, and possible connections to climate and environmental change in the Pacific sector of the Arctic, the Alaska Blocking Index (ABI) is developed over the domain (54°–76°N, 125°–180°W) using daily gridded 500 hPa geopotential height fields derived from the ERA-40 (1958–1978) and ERA-Interim (1979–2014) data sets, 1958–2014. Climatological characteristics of the seasonal and annual ABI conditions are evaluated and periods of prevalent blocking conditions are identified and subsequently linked to possible local and large-scale forcing mechanisms. The ABI has exhibited positive trends during all seasons and annually since 1979. Many of the extreme high ABI values occurred since 2000, including the highest annual values in 2013 and 2014. Anomalous blocking patterns in all seasons are associated with diminished snow depth and sea-ice cover, positive near-surface air temperature anomalies, and anticyclonic flows of heat and moisture across the domain. The ABI is also shown to differ from the long-term variability and atmospheric circulation responses associated with phases of the Pacific–North American pattern and Pacific Decadal Oscillation, revealing some notable spatial and temporal disconnects between the region-centric, high-latitude blocking flow and some of the predominant modes of sea surface temperature and middle tropospheric circulation variability in the Northern Hemisphere. © 2017 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117168
Appears in Collections: 气候减缓与适应
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作者单位: Southeast Regional Climate Center, Department of Geography, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States; Department of Geography, Texas State University, San Marcos, TX, United States; Department of Geography, University of Georgia, Athens, GA, United States
Recommended Citation:
McLeod J.T.,Ballinger T.J.,Mote T.L.. Assessing the climatic and environmental impacts of mid-tropospheric anticyclones over Alaska[J]. International Journal of Climatology,2018-01-01,38(1)