globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-015-2685-z
Scopus记录号: 2-s2.0-84959080534
论文题名:
Karakorum temperature out of phase with hemispheric trends for the past five centuries
作者: Zafar M.U.; Ahmed M.; Rao M.P.; Buckley B.M.; Khan N.; Wahab M.; Palmer J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期:2017-05-06
起始页码: 1943
结束页码: 1952
语种: 英语
英文关键词: Dendroclimatology ; Glaciers ; High Asia ; Karakorum Anomaly ; Temperature
英文摘要: A systematic increase in global temperature since the industrial revolution has been attributed to anthropogenic forcing. This increase has been especially evident over the Himalayas and Central Asia and is touted as a major contributing factor for glacier mass balance declines across much of this region. However, glaciers of Pakistan’s Karakorum region have shown no such decline during this time period, and in some instances have exhibited slight advance. This discrepancy, known as the ‘Karakorum Anomaly’, has been attributed to unusual amounts of debris covering the region’s glaciers; the unique seasonality of the region’s precipitation; and localized cooling resulting from increased cloudiness from monsoonal moisture. Here we present a tree-ring based reconstruction of summer (June–August) temperature from the Karakorum of North Pakistan that spans nearly five centuries (1523–2007 C.E.). The ring width indices are derived from seven collections (six—Picea smithiana and one—Pinus gerardiana) from middle-to-upper timberline sites in the northern Karakorum valleys of Gilgit and Hunza at elevations ranging from 2850 to 3300 meters above mean sea level (mean elevation 3059 m asl). The reconstruction passes all traditional calibration–verification schemes and explains 41 % of the variance of the nested Gilgit–Astore instrumental station data (Gilgit—1454 m asl, 1951–2009; Astore—2167 m asl, 1960–2013). Importantly, our results indicate that Karakorum temperature has remained decidedly out of phase with hemispheric temperature trends for at the least the past five centuries, highlighting the long-term stability of the Karakorum Anomaly, and suggesting that the region’s temperature and cloudiness are contributing factors to the anomaly. © 2015, Springer-Verlag Berlin Heidelberg.
资助项目: NSF, National Science Foundation ; NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53792
Appears in Collections:过去全球变化的重建

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作者单位: Laboratory of Dendrochronology and Plant Ecology, Department of Botany, Federal Urdu University of Arts, Science and Technology, Gulshan-e-Iqbal Campus, Karachi, Pakistan; Tree Ring Laboratory, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Department of Earth and Environmental Science, Columbia University, New York, NY, United States; Laboratory of Plant Ecology Department of Botany, University of Malakand, Khyber Pakhtunkhwa, Pakistan; Center for Plant Sciences and Biodiversity, University of Swat, Khyber Pakhtunkhwa, Pakistan; Climate Change Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, Australia; Department of Environmental Science, Bahauddin Zakariya University, Multan, Pakistan; State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Zafar M.U.,Ahmed M.,Rao M.P.,et al. Karakorum temperature out of phase with hemispheric trends for the past five centuries[J]. Climate Dynamics,2016-01-01,46(2017-05-06)
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