气候变化领域集成服务门户(CCPortal): Evidence for elevation-dependent warming in the St. Elias Mountains, Yukon, Canada

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DOI	10.1175/JCLI-D-19-0405.1
	Evidence for elevation-dependent warming in the St. Elias Mountains, Yukon, Canada
	Williamson S.N.; Zdanowicz C.; Anslow F.S.; Clarke G.K.C.; Copland L.; Danby R.K.; Flowers G.E.; Holdsworth G.; Jarosch A.H.; Hik D.S.
发表日期	2020
ISSN	08948755
起始页码	3253
结束页码	3269
卷号	33 期号:8
英文摘要	The climate of high midlatitude mountains appears to be warming faster than the global average, but evidence for such elevation-dependent warming (EDW) at higher latitudes is presently scarce. Here, we use a comprehensive network of remote meteorological stations, proximal radiosonde measurements, downscaled temperature reanalysis, ice cores, and climate indices to investigate the manifestation and possible drivers of EDW in the St. Elias Mountains in subarctic Yukon, Canada. Linear trend analysis of comprehensively validated annual downscaled North American Regional Reanalysis (NARR) gridded surface air temperatures for the years 1979-2016 indicates a warming rate of 0.0288C a21 between 5500 and 6000 m above mean sea level (MSL), which is;1.6 times larger than the global-average warming rate between 1970 and 2015. The warming rate between 5500 and 6000 m MSL was;1.5 times greater than the rate at the 2000-2500 m MSL bin (0.0198C a21), which is similar to the majority of warming rates estimated worldwide over similar elevation gradients. Accelerated warming since 1979, measured by radiosondes, indicates a maximum rate at 400 hPa (;7010 m MSL). EDW in the St. Elias region therefore appears to be driven by recent warming of the free troposphere. MODIS satellite data show no evidence for an enhanced snow albedo feedback above 2500 m MSL, and declining trends in sulfate aerosols deposited in high-elevation ice cores suggest a modest increase in radiative forcing at these elevations. In contrast, increasing trends in water vapor mixing ratio at the 500-hPa level measured by radiosonde suggest that a longwave radiation vapor feedback is contributing to EDW. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
语种	英语
scopus关键词	Atmospheric radiation; Landforms; Radiosondes; Sea level; Sulfur compounds; Elevation gradient; Linear trend analysis; Long-wave radiation; Meteorological station; Radiosonde measurements; Snow-albedo feedbacks; Surface air temperatures; Water vapor mixing ratio; Atmospheric temperature; aerosol; air temperature; albedo; downscaling; elevation; global warming; mountain region; radiosonde; sea level; Saint Elias Mountains
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178740
作者单位	Department of Geography, Environment and Geomatics, University of Ottawa, Ottawa, ON, Canada; Department of Earth Sciences, Uppsala University, Uppsala, Sweden; Pacific Climate Impacts Consortium, University of Victoria, Victoria, BC, Canada; Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; Department of Geography and Planning, Queen's University, Kingston, ON, Canada; Department of Earth Sciences, Simon Fraser University, Burnaby, BC, Canada; Arctic Institute of North America, University of Calgary, Calgary, AB, Canada; Kufstein, Austria; Department of Biological Sciences, Simon Fraser University, Burnaby, BC, Canada
推荐引用方式 GB/T 7714	Williamson S.N.,Zdanowicz C.,Anslow F.S.,et al. Evidence for elevation-dependent warming in the St. Elias Mountains, Yukon, Canada[J],2020,33(8).
APA	Williamson S.N..,Zdanowicz C..,Anslow F.S..,Clarke G.K.C..,Copland L..,...&Hik D.S..(2020).Evidence for elevation-dependent warming in the St. Elias Mountains, Yukon, Canada.Journal of Climate,33(8).
MLA	Williamson S.N.,et al."Evidence for elevation-dependent warming in the St. Elias Mountains, Yukon, Canada".Journal of Climate 33.8(2020).