Afforestation in China cools local land surface temperature

S.-S. Peng 1 S. Piao 1, 2 Z. Zeng 1 P. Ciais 3 L. Zhou 4 L.Z.X. Li 5 R.B. Myneni 6 Y. Yin 1 H. Zeng 7
1 Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
2 Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China
3 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
4 Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY 12222, United States
5 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
6 Department of Earth and Environment, Boston University, Boston, MA 02215, United States
7 Peking University Shenzhen Graduate School, Shenzhen 518055, China
Abstract : 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.
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Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2014, 111 (8), pp.2915-2919. 〈10.1073/pnas.1315126111〉
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S.-S. Peng, S. Piao, Z. Zeng, P. Ciais, L. Zhou, et al.. Afforestation in China cools local land surface temperature. Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2014, 111 (8), pp.2915-2919. 〈10.1073/pnas.1315126111〉. 〈hal-01074228〉

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