| Autor: |
Li, Yan, Xu, Ru, Yang, Zhao, Zhou, Sha, Lu, Mengqian, Lin, Huiqing, Zi, Shuangshuang, Su, Ruijie |
| Předmět: |
|
| Zdroj: |
Geophysical Research Letters; 9/28/2024, Vol. 51 Issue 18, p1-10, 10p |
| Abstrakt: |
Dryland precipitation depends on upwind and local moisture sources via moisture recycling. How upwind moisture variations affect interannual variations of downwind precipitation and vegetation in China's drylands remains unclear. We used high‐resolution moisture tracking data sets and found terrestrial moisture (93%) was the dominant moisture source for China's drylands, especially from drylands themselves (46%). In most dryland grids, we observed strong correlations between precipitation and upwind moisture sources from 2003 to 2022 (median r = 0.55), with a more significant effect in drier areas. These demonstrated the upwind moisture control on interannual variations of dryland precipitation, in which internal moisture from drylands exceeds the influence of external terrestrial sources. The upwind moisture variations, especially the recycled moisture of drylands, propagate to influence downwind vegetation greenness in precipitation‐sensitive dryland areas. Our findings revealed that upwind moisture variations induced by climate or land‐cover changes have important implications for water and food security in China's drylands. Plain Language Summary: Moisture recycling refers to the hydrological cycling in which winds transport evapotranspiration water from upwind source regions and generate precipitation in downwind regions. Precipitation in China's drylands depends on moisture from their upwind source regions, mainly Eurasia and the drylands themselves. Therefore, variations in evaporated water from upwind source regions may affect precipitation in China's drylands and vegetation activities that require water. This study used moisture tracking data sets and found the crucial influence of upwind moisture on dryland precipitation across years. The year‐by‐year changes in upwind moisture, especially from drylands themselves, influence precipitation and vegetation activities in dryland areas where vegetation growth is sensitive to water. The moisture changes due to climate or land cover changes in the upwind source regions could affect water and food security in China's drylands. Key Points: Upwind moisture source regions and downwind China's drylands are tele‐connected through moisture recyclingUpwind moisture variations induce interannual variations in dryland precipitation and vegetation greennessUpwind moisture variations have implications for water and food security in China's drylands [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Plný text