Climate Change Research ›› 2018, Vol. 14 ›› Issue (5): 465-474.doi: 10.12006/j.issn.1673-1719.2018.044

• Changes in Climate System • Previous Articles     Next Articles

Analysis of circulation feature and water vapor transport of winter precipitation anomaly in Northern Xinjiang

Ya-Yun LI1,2(),Lian-Mei YANG1,2()   

  1. 1 Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China
    2 Central Asia Research Center of Atmosphere, Urumqi 830002, China
  • Received:2018-04-03 Revised:2018-05-29 Online:2018-11-30 Published:2018-09-30

Abstract:

Circulation feature and water vapor transport of winter precipitation anomaly were studied by using the ERA-Interim reanalysis data and the daily rainfall observations of 49 meteorological stations in winter in Northern Xinjiang during 1979-2016. The analyzed results showed that two routes of water vapor transport had an effect on winter precipitation in Northern Xinjiang. The west water vapor passage was Mediterranean Sea-Black Sea-Caspian Sea-Aral Sea-Balkhash Lake-Northern Xinjiang, the southwest water vapor passage was Red Sea-Persian Gulf/southern Caspian Sea-Balkhash Lake-Northern Xinjiang. Two of the passages, the west water vapor passage was more important. The reasons for more (less) winter rainfall in Northern Xinjiang were that, on 500 hPa, high (Low) pressure was anomaly active in high latitude, transient low-pressure disturbance (high pressure) was unusually active in Siberia and high-pressure ridge (low-pressure trough) was unusually in Iranian plateau. The reasons for more (less) winter rainfalls in the northwest of Northern Xinjiang were that, on 500 hPa, positive (negative) anomaly was active in Scandinavian Peninsula, negative (positive) anomaly was active in Siberia-Iranian plateau, and low-pressure trough (high-pressure ridge) was unusually active in Mediterranean. The reasons for more (less) winter rainfalls in the west of Northern Xinjiang were that, on 500 hPa, negative (positive) anomaly was active in the southwest side of the Balkhash Lake, positive (negative) anomaly was active in Siberia. Three of the distributions, the most main distribution pattern was consistent in wintertime precipitation in Northern Xinjiang.

Key words: Northern Xinjiang, Winter precipitation, Water vapor transport, Circulation feature

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