3类大风的多普勒雷达与风廓线雷达特征分析
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摘要
利用多普勒雷达与风廓线雷达资料分析了浮梁县的强对流大风、台风大风和冷空气大风3类大风的的特征,主要结论如下:强对流大风多由飑线移动造成,回波强度可达45~60 d Bz或以上,强回波与≥20 m/s大速度区配合,VIL的强度在20~25 kg/m~2,有时伴有"弓形"、"V"型缺口等明显特征。而台风大风回波均匀,强度多为20~30 d Bz,速度场上伴有明显的偏东风低空急流和超低空急流,VIL很小。单纯的冷空气大风在多普勒雷达上无反映。强对流大风出现前,在风廓线中层有20 m/s或以上的西南急流出现,并逐渐下传,但底层不一定有风力明显加大的现象,而台风大风、冷空气大风出现时,底层有持续的12 m/s的大风区出现。强对流大风Cn~2在可表现为底层至高层一致达最大值,而台风大风仅表现为底层附近达最大值,冷空气大风则表现为整层最小。
Based on Doppler radar and Wind Profile radar data,the characteristics of three strong winds such as severe convection wind,typhoon wind and cold air wind in Fuliang county are analyzed. The comparative analysis indicates: Severe convection winds are mostly caused by the movement of squall lines. The echo intensity is up to 45 ~ 60 d Bz or above,and is matched with the ≥20 m/s large velocity region. The intensity of VIL is in the 20 ~ 25 kg/m~2,The echo is sometimes accompanied by the characteristics of the "bow"and "V"type gap. The echo of typhoon wind is uniform,The echo intensity is 20 ~ 30 d Bz,The velocity field is accompanied by obvious easterly Lowlevel Jet and extra Low-level Jet. The VIL value is very small. The simple cold air wind is not reflected on the Doppler radar. Before the occurrence of severe convective wind,the wind profile radar data showed that the southwest jet with 20 m/s or above appeared and gradually spread down,but there was not necessarily a significant increase in the wind force at the bottom. But when the typhoon wind and the cold air wind appear,the wind field has a continuous 12 m/s wind area on the bottom of the wind field. In the background of severe convective wind,the Cn~2 value is the highest value from the bottom to the top. Under the condition of typhoon strong wind,the Cn~2 value only shows the maximumvalue near the bottom. Under the cold air and strong wind weather,the Cn~2 value is the smallest.
Based on Doppler radar and Wind Profile radar data,the characteristics of three strong winds such as severe convection wind,typhoon wind and cold air wind in Fuliang county are analyzed. The comparative analysis indicates: Severe convection winds are mostly caused by the movement of squall lines. The echo intensity is up to 45 ~ 60 d Bz or above,and is matched with the ≥20 m/s large velocity region. The intensity of VIL is in the 20 ~ 25 kg/m~2,The echo is sometimes accompanied by the characteristics of the "bow"and "V"type gap. The echo of typhoon wind is uniform,The echo intensity is 20 ~ 30 d Bz,The velocity field is accompanied by obvious easterly Lowlevel Jet and extra Low-level Jet. The VIL value is very small. The simple cold air wind is not reflected on the Doppler radar. Before the occurrence of severe convective wind,the wind profile radar data showed that the southwest jet with 20 m/s or above appeared and gradually spread down,but there was not necessarily a significant increase in the wind force at the bottom. But when the typhoon wind and the cold air wind appear,the wind field has a continuous 12 m/s wind area on the bottom of the wind field. In the background of severe convective wind,the Cn~2 value is the highest value from the bottom to the top. Under the condition of typhoon strong wind,the Cn~2 value only shows the maximumvalue near the bottom. Under the cold air and strong wind weather,the Cn~2 value is the smallest.
引文
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[2]赵坤,王明筠,朱科锋,等.登陆台风边界层风廓线特征的地基雷达观测[J].气象学报,2015,75(3):837-852.
[3]李晓波,崔明,刘一玮.风廓线雷达与多普勒天气雷达风廓线产品适用性分析[J].气象水文海洋仪器,2015(4):28-32.
[4]王天义,朱克云,张杰,等.风廓线雷达与多普勒天气雷达风矢产品对比及相关分析[J].气象科技,2014,42(2):231-239.
[5]苏俐敏,郭水连,帅莉莉.宜春地区三类典型天气的风廓线雷达产品特征分析[J].气象与减灾研究,2013,36(3):63-68.
[6]王令,王国荣,古月,等.风廓线雷达垂直径向速度应用初探[J].气象,2014,40(3):290-296.
[7]宋巧云,孙成云,梁丰,等.风廓线雷达在北京市气象局的业务应用[J].气象科技进展,2013,3(5):24-28.
[8]曾瑾瑜,夏丽花,陈文键.福建省风廓线雷达资料在一次强对流天气过程中的应用[J].气象与环境科学,2014,37(3):40-48.
[9]李典,鲁杨,吴宇童.冷涡背景下风廓线资料在沈阳对流天气预报中的应用[J].干旱气象,2016,34(5):886-897.
[10]吴志根.边界层风廓线雷达在降水时段中的在线分析应用研究[J].气象,2012,38(6):758-763.
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