Climate Change Data Portal
DOI | 10.1080/15230430.2019.1650542 |
NDVI-Climate relationships in high-latitude mountains of Alaska and Yukon Territory | |
Verbyla, David1; Kurkowski, Thomas A.2 | |
发表日期 | 2019 |
ISSN | 1523-0430 |
EISSN | 1938-4246 |
卷号 | 51期号:1页码:397-411 |
英文摘要 | High-latitude systems in northwestern Canada and Alaska have warmed rapidly. The aim of this study was to examine how a remotely sensed proxy of vegetation productivity varied among mountain ranges with respect to elevation and climate from 2002-2017. Our study area included high-latitude mountains in Alaska, USA, and Yukon Territory, Canada, ranging from cold arctic mountains in the tundra biome to warmer interior mountains areas within the boreal biome. We used the annual maximum Normalized Difference Vegetation Index (NDVI) data from the 250-m MODIS NDVI product as a proxy of maximum growing season photosynthetic activity. The long-term (16-year) and interannual pattern of maximum NDVI was investigated with respect to elevation, July temperature, and July precipitation classes within four climatic mountain regions. The July temperature lapse rate was consistently linear, whereas the long-term maximum NDVI lapse rate was nonlinear. At lower elevations, the high-precipitation region had the highest NDVI, whereas the interior mountains region had the highest NDVI at higher elevations. The long-term maximum NDVI was negatively correlated with July precipitation for areas with July temperature below 12 degrees C. Above 12 degrees C, NDVI was positively correlated with July precipitation, with the greatest rate of NDVI increase with precipitation at the warmest July temperature class. The pattern of interannual peak NDVI with respect to July temperature was not as strong as the long-term pattern; however, the only interannual negative correlation between peak NDVI and July temperature was at lower elevations within the interior mountains. We concluded that among a regional climatic gradient of mountain areas, low growing season temperature and length were likely constraining vegetation productivity, and lower growing season moisture may be an important constraint at the warmest interior mountains region. |
WOS研究方向 | Environmental Sciences & Ecology ; Physical Geography |
来源期刊 | ARCTIC ANTARCTIC AND ALPINE RESEARCH
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/90755 |
作者单位 | 1.Univ Alaska Fairbanks, Dept Nat Resources Management, Fairbanks, AK 99775 USA; 2.Univ Alaska Fairbanks, Scenarios Network Alaska & Arctic Planning, Fairbanks, AK USA |
推荐引用方式 GB/T 7714 | Verbyla, David,Kurkowski, Thomas A.. NDVI-Climate relationships in high-latitude mountains of Alaska and Yukon Territory[J],2019,51(1):397-411. |
APA | Verbyla, David,&Kurkowski, Thomas A..(2019).NDVI-Climate relationships in high-latitude mountains of Alaska and Yukon Territory.ARCTIC ANTARCTIC AND ALPINE RESEARCH,51(1),397-411. |
MLA | Verbyla, David,et al."NDVI-Climate relationships in high-latitude mountains of Alaska and Yukon Territory".ARCTIC ANTARCTIC AND ALPINE RESEARCH 51.1(2019):397-411. |
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