Abstract Within the context of climate change (e.g., climate warming and changes in atmospheric circulation) the temporal dynamics of vegetation growth on the Tibetan Plateau (TP) have remained unclear, especially over the most recent decade. Using a normalized difference vegetation index (NDVI), we investigated vegetation dynamics on TP from 2000 to 2018, with a special focus on the northeastern part controlled by the westerlies and the southwestern part controlled by the Indian monsoon. Results indicate that the northeastern part had a consistent greening trend, but the southwestern part was browning in the 2000s and turned to greening in the 2010s. Precipitation was the key factor controlling NDVI dynamics in both parts. Differences in seasonality and trends in the strength of the atmospheric circulation might contributed to the distinct NDVI dynamics in these two parts. Our findings, in combination with previous reports on changes in the westerlies and Indian monsoon, highlight the importance of linking vegetation dynamics and atmospheric circulation for predicting the trend of plant growth on TP in the future.

中文翻译：

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近二十年来青藏高原西南部褐变趋势的转变

摘要 在气候变化（如气候变暖和大气环流变化）的背景下，青藏高原（TP）植被生长的时间动态仍不清楚，尤其是最近十年。我们使用归一化差异植被指数 (NDVI) 研究了 2000 年至 2018 年青藏高原植被动态，特别关注受西风带控制的东北部和受印度季风控制的西南部。结果表明，东北部有一致的绿化趋势，而西南部在2000年代呈褐变，并在2010年代转为绿化。降水是控制两部分 NDVI 动态的关键因素。季节性差异和大气环流强度趋势可能导致这两部分的 NDVI 动态不同。我们的研究结果与之前关于西风和印度季风变化的报告相结合，强调了将植被动态和大气环流联系起来对预测未来青藏高原植物生长趋势的重要性。