Precipitation Anomalies in Flood-Season and Atmospheric Water Vapor Transport over the Southern Qinghai Plateau
Regional differences of the flood-season (June, July and August) precipitation over the southern Qinghai Plateau (SQP for short) are examined with observations of 19 surface meteorological stations from 1961 to 2004. Analysis indicates that the precipitation change is characterized by regional differences among the Northeast, the West and the Center-South of the SQP, especially in the occurrence of typical rainy and rainless years. Based on the NCEP/NCAR reanalysis data, atmospheric water vapor transport is explored in the typical rainy and rainless years for the three regions of the SQP. It is concluded that water vapor transported from the western equatorial Pacific O-cean are the main source for the flood-season pre- cipitation of the northeastern SQP, with the northwestern airflow from the middle-high latitudes of Eurasia serving as an important attributing factor. For the western SQP, flood-season precipitation is depended on both the water vapor transported from the Bay of Bengal and the westerlies. Additionally, it is implied that the activity of the blocking high over the East Europe and the West Siberia plays an indispensable role in the precipitation change over this region during the flood season. As to the central and southern part of the SQP, flood-season precipitation is predominated by water vapor transport of the southwest monsoon and affected by the atmospheric circulation patterns over the middle-high latitudes of Eurasia as well.
southern Qinghai Plateauflood-season precipitationanomalywater vapor transport
NETL
NSTL
万方数据
维普
