Understanding the spatiotemporal dynamics of vegetation drought and its time-lag link with teleconnection factors on the Loess Plateau

• DOI: 10.1016/j.ejrh.2024.101778
• Publication Date: 2024-04-12T03:44:21Z
• Authors: Ming Li; Qingbo Yang; Shengwei Zong; Guiwen Wang; Dawei Zhang
• Keywords: Teleconnection; Loess plateau

Loess Plateau (LP), China This study investigated the spatiotemporal dynamics of vegetation drought on LP using an improved temperature index (ITVDI) and explored its time-lag link with teleconnection factors. Findings indicated that: (1) ITVDI is effective tool for monitoring; (2) droughts were primarily characterized by mild to moderate intensity, spring manifesting most expansive drought-stressed areas (about 61.89% pixels); (3) approximately 71.69% region exhibited increasing trend in drought, particularly Ordos typical agricultural zones; (4) long-term dependence patterns was observed 70.65% region, forest-covered becoming wetter, crop-covered getting drier, grass-covered shifting from dryness wetness; (5) lag time between Southern Oscillation Index (SOI) generally less than four months (approximately 71.01% pixels), while lagged behind Pacific Decadal (PDO) mostly 6 8 (around 75.77% (6) extremum correlation coefficients effectively determined large-scale circulation factors, considering both monotonic non-monotonic relationships. These insights contribute monitoring, risk assessment, early warning system, thereby providing valuable support mitigation management strategies similar regions worldwide.