Variability of the precipitation over the Tianshan Mountains, Central Asia. Part II: Multi‐decadal precipitation trends and their association with atmospheric circulation in both the winter and summer seasons

The annual precipitation over the Tianshan Mountains experienced an inter-decadal transition shift towards increasing trend in late 1980s. This study conducts attribution analysis from atmospheric circulation factors based on Global Precipitation Climatology Centre (GPCC) dataset and NCEP/NACR reanalysis data. results show that (a) Winter is affected by multi-decadal oscillations with periods of 26.8 44.7 years, has entered a period positive anomalies after 1988. Although non-linear winter firstly increased then decreased 1979, fluctuation caused to be wet 1980s until 2011. (b) We find East Atlantic-West Russia (EATL/WRUS) teleconnection pattern similar variability as winter. 1988 mainly due enhanced meridional feature EATL/WRUS triggering more water vapour flux low-latitude oceanic areas. (c) Summer obvious scale 33.5 years shows growth trend. summer humid 1986. (d) Scandinavia (SCAND) represents important affecting precipitation. vigorous high pressure Ural low Central Asia during SCAND negative phase jointly lead moisture transport Arctic Ocean Mountains. (e) Apart SCAND, Silk Road (SRP) Asia-Pacific (EAP) also impacted 1964–1984 1985–2004.