| Title | Impact of Earth Greening on the Terrestrial Water Cycle |
| Authors | Zeng, Zhenzhong Piao, Shilong Li, Laurent Z. X. Wang, Tao Ciais, Philippe Lian, Xu Yang, Yuting Mao, Jiafu Shi, Xiaoying Myneni, Ranga B. |
| Affiliation | Peking Univ, Coll Urban & Environm Sci, Sino French Inst Earth Syst Sci, Beijing, Peoples R China. Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing, Peoples R China. UPMC Univ Paris 06, Sorbonne Univ, CNRS, Lab Meteorol Dynam, Paris, France. CEA CNRS UVSQ, Lab Sci Climat & Environm, Gif Sur Yvette, France. CSIRO Land & Water, Black Mt, Canberra, ACT, Australia. Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Climate Change Sci Inst, Oak Ridge, TN USA. Boston Univ, Dept Earth & Environm, Boston, MA 02215 USA. Peking Univ, Coll Urban & Environm Sci, Sino French Inst Earth Syst Sci, Beijing, Peoples R China. Piao, SL (reprint author), Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing, Peoples R China. |
| Keywords | LEAF-AREA INDEX GLOBAL LAND EVAPOTRANSPIRATION CLIMATE-CHANGE EVAPO-TRANSPIRATION NORTHERN ECOSYSTEMS SURFACE CONDUCTANCE GENERAL-CIRCULATION VEGETATION CHANGES CARBON-DIOXIDE SYSTEM MODELS |
| Issue Date | 2018 |
| Publisher | JOURNAL OF CLIMATE |
| Citation | JOURNAL OF CLIMATE. 2018, 31(7), 2633-2650. |
| Abstract | Leaf area index (LAI) is increasing throughout the globe, implying Earth greening. Global modeling studies support this contention, yet satellite observations and model simulations have never been directly compared. Here, for the first time, a coupled land-climate model was used to quantify the potential impact of the satellite-observed Earth greening over the past 30 years on the terrestrial water cycle. The global LAI enhancement of 8% between the early 1980s and the early 2010s is modeled to have caused increases of 12.06 2.4 mm yr(-1) in evapotranspiration and 12.1 +/- 2.7 mm yr(-1) in precipitation-about 55% +/- 25% and 28% +/- 6% of the observed increases in land evapotranspiration and precipitation, respectively. In wet regions, the greening did not significantly decrease runoff and soil moisture because it intensified moisture recycling through a coincident increase of evapotranspiration and precipitation. But in dry regions, including the Sahel, west Asia, northern India, the western United States, and the Mediterranean coast, the greening was modeled to significantly decrease soil moisture through its coupling with the atmospheric water cycle. This modeled soil moisture response, however, might have biases resulting from the precipitation biases in the model. For example, the model dry bias might have underestimated the soil moisture response in the observed dry area (e.g., the Sahel and northern India) given that the modeled soil moisture is near the wilting point. Thus, an accurate representation of precipitation and its feedbacks in Earth system models is essential for simulations and predictions of how soil moisture responds to LAI changes, and therefore how the terrestrial water cycle responds to climate change. |
| URI | http://hdl.handle.net/20.500.11897/513131 |
| ISSN | 0894-8755 |
| DOI | 10.1175/JCLI-D-17-0236.1 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 城市与环境学院 |
