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Afforestation in China cools local land surface temperature

机译:中国的绿化降温了当地的地表温度

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摘要

China has the largest afforested area in the world (∼62 million hectares in 2008), and these forests are carbon sinks. The climatic effect of these new forests depends on how radiant and turbulent energy fluxes over these plantations modify surface temperature. For instance, a lower albedo may cause warming, which negates the climatic benefits of carbon sequestration. Here, we used satellite measurements of land surface temperature (LST) from planted forests and adjacent grasslands or croplands in China to understand how afforestation affects LST. Afforestation is found to decrease daytime LST by about 1.1 ± 0.5 °C (mean ± 1 SD) and to increase nighttime LST by about 0.2 ± 0.5 °C, on average. The observed daytime cooling is a result of increased evapotranspiration. The nighttime warming is found to increase with latitude and decrease with average rainfall. Afforestation in dry regions therefore leads to net warming, as daytime cooling is offset by nighttime warming. Thus, it is necessary to carefully consider where to plant trees to realize potential climatic benefits in future afforestation projects.
机译:中国拥有世界上最大的造林面积(2008年约为6200万公顷),这些森林是碳汇。这些新森林的气候效应取决于这些人工林上的辐射能和湍流能如何改变地表温度。例如,较低的反照率可能导致变暖,从而抵消了固碳的气候效益。在这里,我们通过卫星测量了来自中国人工林和邻近草地或农田的地表温度(LST),以了解造林对LST的影响。发现造林平均可以使白天的LST降低约1.1±0.5°C(平均±1 SD),并使夜间的LST增加约0.2±0.5°C。白天观测到的降温是蒸散量增加的结果。发现夜间变暖随纬度增加而随平均降雨量减少。因此,干旱地区的绿化会导致净增温,因为白天的降温被夜间的增温所抵消。因此,有必要仔细考虑在未来的造林项目中在哪里种树以实现潜在的气候效益。

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