Surface radiation budget was an important variable for global climate and eco-environment change. Vegetation exerted significant influences on the budget by altering the surface thermal properties and land-atmospheric interactions, while the sign and magnitude remained unclear. With the aid of satellite observations, this study estimated the vegetation influences through a semi-physical approach. Methodologically, a physical model of the total surface radiation budget (R-net) was firstly built. Then, the empirical regressions between vegetation with radiation albedo and thermal emissivity were adopted. Finally, the vegetation influences were estimated by measuring the response of budgets (R-snet, R-lnet and subsequently R-net) to vegetation perturbance. Our results demonstrated that the global R-net presented a positive budget (73.20 W/m(2)) over the past two decades (2001-2020), which was dominated by the positive R-snet (135.52 W/m(2)). In contrast, the R-lnet showed a negative value (-60.92 W/m(2)), which helped to mitigate the warming trend. Vegetation tended to enhance the positive surface radiation budgets. Overall, the vegetation influences on R-snet, R-lnet and R-net were 56.20 W/m(2), -6.65 W/m(2), and 50.29 W/m(2), accounting for 41.47 %, 10.92 % and 68.70 % of the total budgets. Temporally, the vegetation influences showed increasing trends of 0.019 W/m(2)/yr (R-snet), 0.007 W/m(2)/yr (R-lnet) and 0.031 W/m(2)/yr (R-net). Physically, temporal variations of the vegetation influences were strongly affected by the interactions of atmospheric factors, particularly of the cloud, aerosol, and greenhouse gases (GHGs). Results of this study help to capture characteristics of surface radiation budgets and corresponding mechanism, which could support the climatic adaption and eco-environment management. (C) 2022 COSPAR. Published by Elsevier B.V. All rights reserved.
Feng, HH; Xiong, J; Ye, SC; Zou, B; Wang, W
Vegetation change enhanced the positive global surface radiation budget
Advances In Space Research