Evapotranspiration Trends Over the Eastern United States During the 20th Century
| Autor: | Lahouari Bounoua, Genevieve L. Noyce, Robert E. Wolfe, Ping Zhang, Ryan J. Kramer, Thomas G. Huntington, Marc L. Imhoff, Kurtis Thome |
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| Rok vydání: | 2015 |
| Předmět: |
Observational analysis
evapotranspiration vegetation greening vegetation feedback Climate change Vegetation Oceanography Water balance Greening Evapotranspiration Climatology Environmental science Precipitation Surface runoff Waste Management and Disposal Earth-Surface Processes Water Science and Technology |
| Zdroj: | Hydrology Volume 2 Issue 2 Pages 93-111 |
| ISSN: | 2306-5338 |
| DOI: | 10.3390/hydrology2020093 |
| Popis: | Most models evaluated by the Intergovernmental Panel for Climate change estimate projected increases in temperature and precipitation with rising atmospheric CO2 levels. Researchers have suggested that increases in CO2 and associated increases in temperature and precipitation may stimulate vegetation growth and increase evapotranspiration (ET), which acts as a cooling mechanism, and on a global scale, may slow the climate-warming trend. This hypothesis has been modeled under increased CO2 conditions with models of different vegetation-climate dynamics. The significance of this vegetation negative feedback, however, has varied between models. Here we conduct a century-scale observational analysis of the Eastern US water balance to determine historical evapotranspiration trends and whether vegetation greening has affected these trends. We show that precipitation has increased significantly over the twentieth century while runoff has not. We also show that ET has increased and vegetation growth is partially responsible. |
| Databáze: | OpenAIRE |
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