Greening of arctic Alaska, 1981-2001
Greening of arctic Alaska, 1981-2001
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DOI：
10.1029/2003gl018268
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发表时间：
2003-10-29
影响因子：
5.2
通讯作者：
Walker, DA
中科院分区：
文献类型：
--
作者：
Jia, GSJ;Epstein, HE;Walker, DA
[1]在这里，我们分析了阿拉斯加北部三个生物气候亚区的21年卫星数据的时间序列，并确认了阿拉斯加冻土带植被绿度的长期趋势，这种趋势已经在全球范围内检测到了北纬地区。整个区域的峰值植被绿度增加了16.9%(+/-5.6%)，这与气温同步上升相对应。我们还使用11年更精细分辨率(1公里)的卫星数据检查了四种特定植被类型的变化，发现峰值和时间积分绿度的时间变化在潮湿的非酸性苔原地区最大。1981年至2001年间绿度的这些变化大约相当于阿拉斯加冻土带地上植物生物量增加了171克/米(2)(+/-81克/米(2))。这种遥感解译是在该区域没有长期生物量记录的情况下进行的。
[1] Here we analyzed a time series of 21-yr satellite data for three bioclimate subzones in northern Alaska and confirmed a long-term trend of increase in vegetation greenness for the Alaskan tundra that has been detected globally for the northern latitudes. There was a 16.9% ( +/- 5.6%) increase in peak vegetation greenness across the region that corresponded to simultaneous increases in temperatures. We also examined the changes for four specific vegetation types using an 11-yr finer resolution (1-km) satellite data and found that the temporal changes in peak and time-integrated greenness were greatest in areas of moist nonacidic tundra. These changes in greenness between 1981 and 2001 correspond approximately to a 171 g/m(2) ( +/- 81 g/m(2)) increases in aboveground plant biomass for Alaskan tundra. This remotely sensed interpretation is conducted in the absence of long-term biomass records in the region.