Based on NCEP reanalysis data and daily precipitation data of 76 meteorological stations in South China from 1980 to 2011, using Lagrangian trajectory model (HYSPLIT_4), the water vapor transportation path, main sources and its contribution in frontal rainfall and monsoon rainfall anomalies during pre-rainy season in South China were studied. Results showed that: In frontal rainfall phase, water vapor path was mainly from Western Pacific, Arabia sea-Bay of Bengal and Continental Eurasian. In wet years of frontal rainfall, water vapor from the Western Pacific accounted for more than 69%, and the water vapor was 14% higher than that in dry years. While the contribution of water vapor from Arabia seaBay of Bengal was 20%, and the water vapor was 10% less than that in dry years. This stage was greatly influenced by the water vapor from the Pacific Northwest. In Monsoon rainfall phrase, water vapor was mainly from the cross-equatorial flow from north Indian Ocean, the Pacific Northwest wind airflow and the northwest cold air in Eurasia. In wet monsoon rainfall years, the water vapor from India ocean had the largest contribution 88%, the moisture from Indian ocean was 18% higher than that in dry years, while the moisture from the Western Pacific was 7%, the moisture from the Western Pacific was 15% less than that in dry years. This stage was greatly influenced by southwest cross-equatorial flow of water vapor transmission.
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