| 新疆北部一次持续暴雪天气过程分析 |
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| 引用本文： | 刘惠云,崔彩霞,李如琦.新疆北部一次持续暴雪天气过程分析[J].干旱区研究,2011,28(2):282-287. |
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| 作者姓名： | 刘惠云 崔彩霞 李如琦 |
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| 作者单位： | 1. 中国气象局 乌鲁木齐沙漠气象研究所, 新疆 乌鲁木齐 830002;
2. 新疆气象台, 新疆 乌鲁木齐 830002 |
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| 基金项目： | 中国沙漠气象科学研究基金，科技支疆项目，国家自然基金面上项目 |
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| 摘 要： | 利用常规气象观测资料和NCEP/NCAR逐日6 h再分析资料,对2010年1月4～7日新疆北部持续暴雪过程的环流特征及物理量场进行诊断分析.结果表明:北半球中高纬阻塞高压维持时间长、切断低压稳定提供了降雪"持续性"的环流背景.切断低压不断分裂短波并西退再东移是造成降雪的影响系统;降雪区大到暴量的强降雪时段,850 hP...
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| 关 键 词： | 暴雪天气 水汽通量 环流特征 物理量场 新疆 |
| 收稿时间： | 2010-05-14; |
Analysis on a Continuous Snowstorm Process over North Xinjiang in Early January 2010 |
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| LIU Hui-yun,CUI Cai-xia,LI Ru-qi.Analysis on a Continuous Snowstorm Process over North Xinjiang in Early January 2010[J].Arid Zone Research,2011,28(2):282-287. |
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| Authors: | LIU Hui-yun CUI Cai-xia LI Ru-qi |
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| Institution: | 1. Institute Desert Meteorology , China Meteorological Administration, Urumqi 830002, China;
2. Xinjiang Meteorological Observatory, Urumqi 830002, China |
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| Abstract: | In this paper, the circulation features and physical scalar fields of a continuous snowstorm over north Xinjiang, China during the period from January 4th to 7th, 2010 are analyzed based on the observed meteorological data and the daily 6-hour reanalyzed data of NCEP/NCAR. The results reveal that the long duration of blocking high and the stable cutoff low over the mid-high latitudes of the Northern Hemisphere provided a circulation background for the snowstorm. The cutoff low generated continuously short waves, moved back westward and then eastward, and affected the snowstorm; over the snowy area during the heavy snowy period, the strong convergence lines of northwest wind (10-16 m/s) and southeast wind (8-10 m/s) at 850-hPa were maintained, the 700-hPa was the convergence area of wind speed, and the 500-200-hPa was the divergence area. The strong convergence in lower troposphere, strong divergence in mid-high troposphere and strong upward motion were formed in the whole troposphere; water vapor was mainly transported along the southwest path, and some of it came from the northwest. There was a water vapor transport belt near 55°N, and it moved from the east to the west, then from the north and the northwest to the south and then to the southeast. The highest value of water vapor flux along this transport belt accounted nearly 1/4 of the southwest water vapor. Multi-source vapor transport was the main cause of forming the historical infrequent heavy snowstorm in north Xinjiang. |
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| Keywords: | snowstorm water vapour flux circulation feature physical scalar field Xinjiang |
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