Radiative forcing over the conterminous United States due to contemporary land cover land use albedo change
Radiative forcing over the conterminous United States due to contemporary land cover land use albedo change
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DOI：
10.1029/2008gl033567
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发表时间：
2008-05-09
影响因子：
5.2
通讯作者：
Roy, David P.
中科院分区：
文献类型：
--
作者：
Barnes, Christopher A.;Roy, David P.
最近可用的卫星土地覆盖土地利用（LCLU）和CONDO数据被用来研究的影响，从1973年到2000年的LCLU变化对地表CONDO和辐射强迫的36个生态区，覆盖43%的美国（CONUS）。中分辨率成像光谱仪（MODIS）的无雪宽带CONDO值来自Landsat LCLU分类图，使用分层随机抽样方法来估计生态区估计LCLU引起的CONDO变化和地表辐射强迫。结果表明，由于LCLU变化的辐射强迫可能会伪装时，空间和时间上明确的数据集不使用。由当代LCLU突变引起的辐射强迫在符号和量级上因地理位置而异，最大的正强迫（高达0.284 Wm（-2））是由于农业向其他LCLU类型的转化，而最大的负强迫（低至-0.247 Wm（-2））是由于森林损失。对于36个被认为是小净正强迫的生态区（即，0.012 Wm（-2）。
Recently available satellite land cover land use (LCLU) and albedo data are used to study the impact of LCLU change from 1973 to 2000 on surface albedo and radiative forcing for 36 ecoregions covering 43% of the conterminous United States (CONUS). Moderate Resolution Imaging Spectroradiometer (MODIS) snow-free broadband albedo values are derived from Landsat LCLU classification maps located using a stratified random sampling methodology to estimate ecoregion estimates of LCLU induced albedo change and surface radiative forcing. The results illustrate that radiative forcing due to LCLU change may be disguised when spatially and temporally explicit data sets are not used. The radiative forcing due to contemporary LCLU albedo change varies geographically in sign and magnitude, with the most positive forcings (up to 0.284 Wm(-2)) due to conversion of agriculture to other LCLU types, and the most negative forcings (as low as -0.247 Wm(-2)) due to forest loss. For the 36 ecoregions considered a small net positive forcing (i.e., warming) of 0.012 Wm(-2) is estimated.