Biophysical feedback from earlier leaf-out enhances nonerosive precipitation in China

Earlier leaf-out enhances spring moisture exchange between land and atmosphere. However, its impact on precipitation intensity remains unclear, hampering dynamic monitoring on water erosion. Here we combined remote sensing, reanalysis data, and coupled land-atmosphere model to address this knowledge gap. Results observed an increasing trend in spring precipitation accompanied by earlier leaf-out across temperate China. The simulations isolated the phenological impacts and attributed it to the enhancement of nonerosive precipitation. The mid-temperate semi-humid region exhibited the largest increase (3.03 ± 3.66 mm) in response to 14-days leaf-out advancement. Conversely, erosive precipitation declined in sparsely vegetated areas (

展叶期提前可强化陆地与大气间的春季水汽交换，但其对降水强度（precipitation intensity）的影响尚不明确，这制约了水蚀（water erosion）的动态监测工作。本研究结合遥感（remote sensing）、再分析数据（reanalysis data）与陆气耦合模型（coupled land-atmosphere model），旨在填补这一研究空白。研究结果表明，中国温带地区春季降水随展叶期提前呈上升趋势。模拟实验分离了物候影响，并将该降水增加趋势归因于非侵蚀性降水（nonerosive precipitation）的强化。中温带半湿润区域在展叶期提前14天时，降水增幅最为显著，达3.03 ± 3.66毫米。与之相反，植被稀疏区域（sparsely vegetated areas）的侵蚀性降水（erosive precipitation）有所减少（