Afforestation in China cools local land surface temperature

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.
Type de document :
Article dans une revue
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〉
Liste complète des métadonnées

Littérature citée [26 références]  Voir  Masquer  Télécharger

https://hal-polytechnique.archives-ouvertes.fr/hal-01074228
Contributeur : Denis Roura <>
Soumis le : jeudi 30 octobre 2014 - 15:26:18
Dernière modification le : mercredi 19 septembre 2018 - 01:24:00
Document(s) archivé(s) le : lundi 2 février 2015 - 16:06:25

Fichier

Peng-afforestation.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

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〉

Partager

Métriques

Consultations de la notice

499

Téléchargements de fichiers

188