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| 辽宁两类降雪过程的对比及定量降雪预报指标 | |
| 引用本文： | 蒋大凯,闵锦忠,阎琦,张宁娜.辽宁两类降雪过程的对比及定量降雪预报指标[J].气象科学,2012,32(2):219-225. |
| 作者姓名： | 蒋大凯 闵锦忠 阎琦 张宁娜 |
| 作者单位： | 1. 南京信息工程大学,南京210044;沈阳中心气象台,沈阳110016 2. 南京信息工程大学,南京,210044 3. 沈阳中心气象台,沈阳,110016 |
| 基金项目： | 公益性行业(气象)科研专项(GYHY201006001);中国气象局预报员专项(CMAYBY2011-007);辽宁省气象局科研项目(201005) |
| 摘 要： | 利用常规气象观测资料和NCEP1°×1°资料,普查辽宁省最近10 a来区域性暴雪、大雪、中雪天气过程,大致可分为北上水汽型和东北上水汽型两类。从环流背景、水汽和动力条件方面对比分析了2004年12月19日和2002年12月16日两次不同类型的降雪过程,发现北上水汽型降雪过程850 hPa比湿和水汽通量大,水汽条件强,动力条件相对弱;而东北上水汽型的降雪过程850 hPa比湿和水汽通量相对小,但动力抬升和辐合作用强。通过分析10 a来辽宁不同类型5场区域性暴雪、8场区域性大雪、9场区域性中雪的水汽条件和动力条件物理量阈值区间,发现北上水汽型降雪过程850 hPa比湿和水汽通量大于东北上水汽型同级别降雪过程,在降大雪量级时的850 hPa比湿和东北上水汽型暴雪过程相当;东北上水汽型降雪过程的最大螺旋度、850 hPa散度、最大垂直速度和850 hPa急流要强于北上水汽型,而且降雪级别越高差距越明显,其中暴雪量级最大垂直速度、850 hPa急流已经达到产生暴雨的动力条件。 |
| 关 键 词： | 降雪 对比分析 水汽输送 动力条件 |
| 收稿时间： | 9/5/2011 12:00:00 AM |
| 修稿时间： | 2011/12/5 0:00:00 |
Comparative analysis on two types of snow process and quantitative indicators of snow forecast in Liaoning Province |
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| JIANG Dakai,MIN Jinzhong,YAN Qi and ZHANG Ningna.Comparative analysis on two types of snow process and quantitative indicators of snow forecast in Liaoning Province[J].Scientia Meteorologica Sinica,2012,32(2):219-225. | |
| Authors: | JIANG Dakai MIN Jinzhong YAN Qi and ZHANG Ningna |
| Institution: | Nanjing University of Information Science & Technology, Nanjing 210044, China; Shenyang Central Meteorological Observatory, Shenyang 110016, China;Nanjing University of Information Science & Technology, Nanjing 210044, China;Shenyang Central Meteorological Observatory, Shenyang 110016, China;Shenyang Central Meteorological Observatory, Shenyang 110016, China |
| Abstract: | In this paper, we surveyed regional snow process in Liaoning Province in the past 10 years, using the regular observation data and NCEP 1°×1°data. It can be divided into two types, one is north vapor transmission channel (we call it the north type), and the other is northeast vapor transmission channel (we call it the northeast type). We compared and analyzed two different types of snow that happened on November 16, 2002 and December 19, 2004, based on circulation, water vapor and dynamic conditions. The results show that the moisture conditions of the north type is better than the north-east type, but the dynamic conditions of the north type is weaker than the northeast type. We analyzed the physical threshold ranges of moisture and dynamic conditions. It shows that the specific humidity and flux at the 850 hPa of the north type is greater than the northeast type at the same level of snow. The water vapor magnitude at 850 hPa of the north type in heavy snow is as near as the snowstorm of the northeast type. The maximum of the helicity, the divergence at 850 hPa, the vertical velocity and the jet stream at 850 hPa of the northeast type is greater than the north type. The gap is more obvious when the level of snowfall is higher. The maximum of the vertical velocity and the jet stream at 850 hPa in the blizzard reached dynamic condition necessary for heavy rain. |
| Keywords: | Snow Comparative analysis Vapor transfer Dynamic condition |
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