Trend Changes of the Vegetation Activity in Northeastern East Asia and the Connections with Extreme Climate Indices

In the context of global warming, vegetation activity in northeastern East Asia (40–45°N, 105–130°E) (NEA) shows a significant growth trend on multidecadal scale, but how changes decadal scale is unclear. this study, we find greening during 1982–1998 and slowdown 1998–2014. Trend analysis extreme climate indices reveals that trends precipitation-related are similar to those change, further correlation have strong positive with NDVI. The results indicate more sensitive precipitation changes, especially precipitation, compared temperature related indices. Furthermore, large-scale atmospheric circulation suggests role Northwest Pacific subtropical high (NPSH) strengthening NPSH before 1998 enhances moisture transport NEA, providing abundant water vapor favorable for events, while after 1998, much weakened, corresponding decrease trend.