Offset of the potential carbon sink from boreal forestation by decreases in surface albedo
Offset of the potential carbon sink from boreal forestation by decreases in surface albedo
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DOI：
10.1038/35041545
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发表时间：
2000-11-09
期刊：
影响因子：
64.8
通讯作者：
Betts, RA
中科院分区：
文献类型：
--
作者：
Betts, RA
通过植树造林吸收碳是一种方法（1）减少二氧化碳净排放到大气中，从而限制气候变化的辐射强迫（2）。但是，造林对气候的总体影响还将取决于与新森林的形成有关的其他影响。特别是，森林景观的辐射度通常低于耕地，特别是当积雪时（3-9），并且减少的辐射度对气候产生正的辐射强迫。在这里，我模拟了由于在温带和北方森林地区植树造林而引起的与地表径流变化相关的辐射强迫，并将这些强迫转化为当地碳储量的等效变化，以与估计的碳固存潜力进行比较（10-12）。我认为，在许多北方森林地区，减少的正强迫引起的CO2可以抵消负强迫，预计从碳封存。因此，一些高纬度造林活动可能会加剧气候变化，而不是如预期的那样减缓气候变化。
Carbon uptake by forestation is one method proposed(1) to reduce net carbon dioxide emissions to the atmosphere and so limit the radiative forcing of climate change(2). But the overall impact of forestation on climate will also depend on other effects associated with the creation of new forests. In particular, the albedo of a forested landscape is generally lower than that of cultivated land, especially when snow is lying(3-9), and decreasing albedo exerts a positive radiative forcing on climate. Here I simulate the radiative forcings associated with changes in surface albedo as a result of forestation in temperate and boreal forest areas, and translate these forcings into equivalent changes in local carbon stock for comparison with estimated carbon sequestration potentials(10-12). I suggest that in many boreal forest areas, the positive forcing induced by decreases in albedo can offset the negative forcing that is expected from carbon sequestration. Some high-latitude forestation activities may therefore increase climate change, rather than mitigating it as intended.