doi:  10.3878/j.issn.1006-9895.1703.16239
Chanchu台风(0601)流出层的低理查森数特征分析

Characteristic Analysis of Low Richardson Number in the Outflow Layer of Typhoon Chanchu (2006)
摘要点击 360  全文点击 358  投稿时间:2016-11-09  
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基金:  国家重点基础研究发展计划(973计划)项目2015CB452804,国家自然科学基金资助项目41530427、41661144024、41475054和41475097,江苏省高校自然科学研究重大项目14KJA170005,灾害天气国家重点实验室开放课题2014LASW-B08
中文关键词:  台风  理查森数  流出层  静力不稳定
英文关键词:  Typhoon  Richardson number  Outflow layer  Static stability
        
作者中文名作者英文名单位
吴天贻WU Tianyi南京信息工程大学气象灾害教育部重点实验室太平洋台风研究中心/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 南京 210044
王咏青WANG Yongqing南京信息工程大学气象灾害教育部重点实验室太平洋台风研究中心/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 南京 210044;中国气象科学研究院灾害天气国家重点实验室(LaSW), 北京 100081
周玉淑ZHOU Yushu中国科学院大气物理研究所云降水物理与强风暴重点实验室(LACS), 北京 100029;中国科学院大学地球科学学院, 北京 100049
引用:吴天贻,王咏青,周玉淑.2017.Chanchu台风(0601)流出层的低理查森数特征分析[J].大气科学,41(5):1101-1112,doi:10.3878/j.issn.1006-9895.1703.16239.
Citation:WU Tianyi,WANG Yongqing,ZHOU Yushu.2017.Characteristic Analysis of Low Richardson Number in the Outflow Layer of Typhoon Chanchu (2006)[J].Chinese Journal of Atmospheric Sciences (in Chinese),41(5):1101-1112,doi:10.3878/j.issn.1006-9895.1703.16239.
中文摘要:
      对流层高层存在流出层是台风环流结构的一个典型特征,但是关于台风流出层层结及不稳定特征的分析相对较少。本文利用了非静力中尺度WRF模式输出的0601号Chanchu台风的模式模拟资料,以Ri(理查森数)<1为判据,分析了存在于Chanchu台风流出层的低理查森数,以及它的分布特征与形成原因。分析表明,在Chanchu台风流出层10~16 km高度附近,低理查森数出现频率较大,甚至达到湍流标准,这与Emmanuel(2011)推测得出的结论一致。通过对比台风发展过程发生、发展、成熟和消亡阶段流出层低理查森数的状况,发现低理查森数的出现频率与Chanchu台风强度有较好的对应关系,即Chanchu台风强度越强,低理查森数出现的频率越高,范围也越大,同时,Chanchu流出层的低理查森数的存在及分布特征受到水平风的垂直切变和稳定度影响。在Chanchu台风强度缓变过程中,低理查森数的分布还存在日变化,这与太阳辐射日变化导致的辐射加热和冷却造成的稳定度变化有关。分析揭示出存在于Chanchu台风流出层的低理查森数层的结构特征,也验证了低理查森数层对Chanchu台风的强度和辐射日变化具有敏感性。
Abstract:
      One typical structure of typhoon is the outflow layer in the upper troposphere. However, there were relatively few studies on the outflow layer. In terms of criterion Richardson number, the data from numerical simulations of the non-hydrostatic mesoscale model WRF on typhoon Chanchu (2006) was used to investigate low Richardson number in the upper troposphere, as well as the structure and causes of the low Richardson layer. Results demonstrate that the prominent frequency of low Richardson number that even reached the turbulence criticality existed in the altitudes ranging from 10 km to 16 km, supporting the assumption of Richardson number criticality in tropical cyclone by Emanuel (2011). By comparing differences in the low Richardson number layer during the newly-born stage, developing stage, mature stage and decaying stage of the tropical cyclone, a correlation was found between the frequency of low Richardson number and the strength of the tropical cyclone, namely, the low Richardson number layer was found to be more common and broader in the stronger phase of the tropical cyclone. The presence and distribution of low Richardson number in the outflow layer was characterized by vertical wind shear and static stability. Along with the process of slowly changing of typhoon intensity, the frequency and distribution of low Richardson number exhibited a diurnal variation, which was associated with the change in static stability caused by diurnal variation of solar radiation. This study revealed the existence of upper-tropospheric low Richardson layer in tropical cyclones, and verified the sensitivity of Richardson number to cyclone intensity and the radiation diurnal cycle.
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