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首页> 外文学位 >Convective and rainfall properties of tropical cyclone inner cores and rainbands in relation to tropical cyclone intensity changes using eleven years of Tropical Rainfall Measuring Mission data.
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Convective and rainfall properties of tropical cyclone inner cores and rainbands in relation to tropical cyclone intensity changes using eleven years of Tropical Rainfall Measuring Mission data.

机译：使用十一年的热带降雨测量任务数据，热带气旋内芯和雨带的对流和降雨特性与热带气旋强度变化的关系。

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摘要

Covering December 1997 through December 2008, over 13,000 tropical cyclone (TC) overpasses of 945 TCs by the Tropical Rainfall Measuring Mission (TRMM) satellite are used to document the observed passive microwave ice scattering magnitudes, radar reflectivity, IR cloud top height, total lightning, and derived rainfall parameters including rain rate, raining area, and volumetric rain. A semimanual method is used to divide TC raining area into inner core (IC), inner rainband (IB), and outer rainband (OB) regions. Precipitation features (PFs) within these regions are compared for their convective vigor and rainfall characteristics based on passive microwave, IR, radar, and lightning properties. These properties in the IC region are further examined in terms of different TC intensity and intensity change categories. TC intensity categories include tropical depressions (TDs), tropical storms (TSs), category 1-2 hurricanes (CAT12s), and category 3-5 hurricanes (CAT35s). The 24-h TC intensity change categories include weakening (W), neutral (N), slowly intensifying (SI), and rapidly intensifying (RI).;The stronger tails of the convective intensity distributions are found to be similar for features in both the IC and OB regions, while the features in the IB region yield the weakest convective signatures. However, at the middle to weaker end of the convective spectrum, ice scattering signatures and reflectivity profiles are the strongest for features in the IC region, followed by those in the IB, then those in the OB. The same order is found for the whole distribution spectrum of feature conditional mean rain rates in these regions. The convective intensity of features in the IC region are found to increase as storm intensity increases, except at the strongest end of the spectrum, where ice scattering signatures and reflectivity profiles are stronger in features associated with TS and TD strength storms rather than those associated with hurricane strength storms. The IC conditional mean rain rate and volumetric rain increase as storm intensity increases. It is found that necessary conditions for RI are that the minimum 85 GHz PCT in the IC region must be less than 256 K and the minimum 37 GHz PCT must be less than 275 K. Over 98% of RI minimum 11im brightness temperatures in the IC region are less than 212 K. RI storms always have larger raining area and volumetric rain in the IC region than storms in other intensity change categories.
机译：从1997年12月到2008年12月，热带雨量测量任务（TRMM）卫星对945个TC进行了超过13,000次热带气旋（TC）立交，用于记录观测到的无源微波冰散射量，雷达反射率，IR云顶高度，总闪电，并得出降雨参数，包括降雨率，降雨面积和体积降雨。使用半手动方法将TC雨区分为内芯（IC），内雨带（IB）和外雨带（OB）区域。根据被动微波，红外，雷达和雷电特性，比较了这些区域内的降水特征（PF）的对流活力和降雨特征。将根据不同的TC强度和强度变化类别进一步检查IC区域中的这些特性。 TC强度类别包括热带低压（TD），热带风暴（TS），1-2级飓风（CAT12）和3-5级飓风（CAT35）。 24-h TC强度变化类别包括减弱（W），中性（N），缓慢增强（SI）和快速增强（RI）.;发现对流强度分布的强尾在两个特征上相似IC和OB区域，而IB区域的特征产生最弱的对流签名。但是，在对流光谱的中到较弱的一端，冰散射特征和反射率剖面对于IC区域中的特征最强，其次是IB中的特征，然后是OB中的特征。对于这些区域中的条件条件平均降雨率的整个分布范围，发现了相同的顺序。发现IC区域内特征的对流强度随风暴强度的增加而增加，但在光谱的最强端除外，在与TS和TD强度风暴相关的特征中，冰散射特征和反射率分布更强，而与光谱强度最强的特征无关。飓风强度风暴。 IC的条件平均降雨率和体积降雨随风暴强度的增加而增加。发现RI的必要条件是IC区域中的最低85 GHz PCT必须小于256 K，而37 GHz PCT最低必须必须小于275K。RI中98％的最低11im亮度温度区域小于212K。与其他强度变化类别的风暴相比，IC区域的RI风暴总是具有更大的降雨面积和大量降雨。

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  • 作者

    Ramirez, Ellen Michelle.;

  • 作者单位

    The University of Utah.;

  • 授予单位 The University of Utah.;
  • 学科 Meteorology.;Atmospheric Sciences.
  • 学位 M.S.
  • 年度 2011
  • 页码 144 p.
  • 总页数 144
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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