气候变化领域集成服务门户(CCPortal): Arctic greening associated with lengthening growing seasons in Northern Alaska

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DOI	10.1088/1748-9326/ab5e26
	Arctic greening associated with lengthening growing seasons in Northern Alaska
	Arndt K.A.; Santos M.J.; Ustin S.; Davidson S.J.; Stow D.; Oechel W.C.; Tran T.T.P.; Graybill B.; Zona D.
发表日期	2019
ISSN	17489318
卷号	14 期号:12
英文摘要	Many studies have reported that the Arctic is greening; however, we lack an understanding of the detailed patterns and processes that are leading to this observed greening. The normalized difference vegetation index (NDVI) is used to quantify greening, which has had largely positive trends over the last few decades using low spatial resolution satellite imagery such as AVHRR or MODIS over the pan-Arctic region. However, substantial fine scale spatial heterogeneity in the Arctic makes this large-scale investigation hard to interpret in terms of vegetation and other environmental changes. Here we focus on one area of the northern Alaskan Arctic using high spatial resolution (4 m) multispectral satellite imagery from DigitalGlobe™ to analyze the greening trend near Utqiagvik (formerly known as Barrow) over 14 years from 2002 to 2016. We found that tundra vegetation has been greening (τ = 0.65, p = 0.01, NDVI increase of 0.01 yr-1) despite no overall change in vegetation community composition. The greening is most closely correlated to the number of thawing degree days (R 2 = 0.77, F = 21.5, p < 0.001) which increased in a similar linear trend over the 14 year study period (1.79 ± 0.50 days per year, p < 0.01, τ =-0.56). This suggests that in this Arctic ecosystem, greening is occurring due to a lengthening growing season that appears to stimulate plant productivity without any significant change in vegetation communities. We found that vegetation communities in wetter locations greened about twice as fast as those found in drier conditions supporting the hypothesis that these communities respond more strongly to warming. We suggest that in Arctic environments, vegetation productivity may continue to rise, particularly in wet areas. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Arctic greening; Climate change; Greening; High-resolution remote sensing; Landscape heterogeneity; Time-series
语种	英语
scopus关键词	Climate change; Image resolution; Productivity; Remote sensing; Satellite imagery; Time series; Arctic greening; Greening; High resolution remote sensing; High spatial resolution; Landscape heterogeneities; Multispectral satellite imagery; Normalized difference vegetation index; Vegetation community compositions; Vegetation; AVHRR; climate change; data interpretation; environmental change; greenspace; growing season; heterogeneity; image resolution; MODIS; NDVI; plant community; satellite imagery; spatial analysis; time series analysis; warming; Alaska; Barrow; United States
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154223
作者单位	Biology Department, San Diego State University, San Diego, CA, United States; Department of Land, Air and Water Resources, University of California at Davis, Davis, CA, United States; Department of Geography, University of Zurich, Zurich, Switzerland; Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON, Canada; Department of Geography, San Diego State University, San Diego, CA, United States; Department of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom; Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA, United States; Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
推荐引用方式 GB/T 7714	Arndt K.A.,Santos M.J.,Ustin S.,et al. Arctic greening associated with lengthening growing seasons in Northern Alaska[J],2019,14(12).
APA	Arndt K.A..,Santos M.J..,Ustin S..,Davidson S.J..,Stow D..,...&Zona D..(2019).Arctic greening associated with lengthening growing seasons in Northern Alaska.Environmental Research Letters,14(12).
MLA	Arndt K.A.,et al."Arctic greening associated with lengthening growing seasons in Northern Alaska".Environmental Research Letters 14.12(2019).