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首页> 外文期刊>Journal of Remote Sensing & GIS >Changes in Alaskan Tundra Ecosystems Estimated from MODIS Greenness Trends, 2000 to 2010
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Changes in Alaskan Tundra Ecosystems Estimated from MODIS Greenness Trends, 2000 to 2010

机译：根据2000年至2010年MODIS绿色趋势估算的阿​​拉斯加苔原生态系统变化

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摘要

Trends in the monthly moderate resolution Imaging Spectroradiometer (MODIS) Enhanced Vegetation Index (EVI) time-series were analyzed for tundra ecosystems of Alaska over the past decade. Results showed that 10% of all tundra-dominated areas in Alaska were detected with significant (p<0.05) positive or negative MODIS growing season EVI trends from 2000 to 2010. Nearly three-quarters of these pixel areas were detected with significant positive growing season EVI trends. This 3:1 ratio of positive to negative EVI trends was consistent across both wetland and nonwetland tundra cover categories. Ecoregions of Alaska that revealed the highest density of positive areas for tundra growing season EVI slope were along the Pacific coast, namely the western Arctic Foothills, the Seward Peninsula, and the southern coastal plain. Associations between annual temperature and moisture patterns and tundra EVI trends across these regions revealed that change patterns in both the climate moisture index (CMI) and growing degree days (GDD) were related to increasing tundra EVI growing season trends. Results showed a notable association between the largest positive trends in MODIS greenness and annual warming trends of greater than 2 GDD per year.
机译：在过去十年中，对阿拉斯加的苔原生态系统的月度中等分辨率成像光谱仪（MODIS）增强植被指数（EVI）时间序列的趋势进行了分析。结果表明，从2000年到2010年，在阿拉斯加所有苔原控制的地区中，有10％的MODIS生长季EVI呈正或负显着正态变化（p <0.05）。在这些像素区域中，有近四分之三被发现具有明显的正生季。 EVI趋势。在湿地和非湿地苔原覆盖类别中，EVI趋势的正负比例为3：1一致。阿拉斯加的生态区显示出苔原生长期EVI坡的正区密度最高，位于太平洋沿岸，即北极北极丘陵地带，苏厄德半岛和南部沿海平原。这些地区的年度温度和湿度模式与苔原EVI趋势之间的关联表明，气候湿度指数（CMI）和生长度日（GDD）的变化模式都与苔原EVI生长季节趋势的增加有关。结果显示，MODIS绿度的最大积极趋势与每年超过2 GDD的年度变暖趋势之间存在显着关联。

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