Numerical study of effects of synoptic-scale disturbances at high and low latitudes on mean summer precipitation over north-eastern China and the Tibetan Plateau,International Journal of Climatology

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Numerical study of effects of synoptic-scale disturbances at high and low latitudes on mean summer precipitation over north-eastern China and the Tibetan Plateau
International Journal of Climatology ( IF 3.9 ) Pub Date : 2021-03-30 , DOI: 10.1002/joc.7093
Chenyu Wang ₁ , Suxiang Yao ₁

Affiliation

We analysed the effects of synoptic-scale disturbances (below periods <10 d) on summer precipitation over north-eastern China and the Tibetan Plateau using observations and the regional climate model (RegCM4.6). Based on observed rainfall and ERA-Interim reanalysis, singular value decomposition analysis showed that rainfall in these regions was significantly coupled with such disturbances at different latitudes in the troposphere. We further analysed this dynamic process by filtering out disturbances at different latitudes with respect to lateral boundary conditions. We then used sensitivity experiments to determine that the background specific humidity and wind (over periods >10 d) would be affected by the change of synoptic scale disturbances at lateral boundary. Weak mid-high-latitude (north of 30°N) disturbances also enhanced the intensity of mean meridional winds, leading to the northward transport of warm/wet advection that changed the thermal structure of the lower troposphere. The subsequent formation of divergence and high pressure in the upper troposphere caused increased precipitation in the two regions, though changes in low-latitude (south of 30°N) disturbances had little effect. Further sensitivity experiments aimed at filtering out such disturbances to the west and north of the mid-high-latitude area revealed two propagation paths: disturbances in the west affected precipitation in both regions, while disturbances in the north mainly affected precipitation in north-eastern China.

更新日期：2021-03-30

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