CAJ | 학술논문

该文给出了热带气旋暖心垂直倾斜度参数犉TC-VGP （TC vertical gradient parameter）的定义。使用卫星微波遥感的温度垂直分布以及热带气旋最佳路径数据等资料，对2009-2011年典型热带气旋的暖心垂直倾斜度进行计算，并研究其与气旋强度变化的关系。结果表明：暖心垂直倾斜度参数犉TC-VGP变化与气旋自身强度变化有较好的对应性，该参数的变化能够明显地指示气旋强度增强、减弱以及强度突变，能够指示环境场变化（冷空气侵入）等；其与气旋强度变化的周期不同，在强度增强或减弱阶段，倾斜度参数是经过快速适应性调整才完成了对热带气旋变化过程的贡献。因此，犉TC-VGP参数的计算和研究结果实现了对于热带气旋内部三维结构特征的定量描述，可以准确把握热带气旋强度和变化趋势，并对热带气旋的监测、预报具有一定业务参考价值。
해문급출료열대기선난심수직경사도삼수순TC-VGP （TC vertical gradient parameter）적정의。사용위성미파요감적온도수직분포이급열대기선최가로경수거등자료，대2009-2011년전형열대기선적난심수직경사도진행계산，병연구기여기선강도변화적관계。결과표명：난심수직경사도삼수순TC-VGP변화여기선자신강도변화유교호적대응성，해삼수적변화능구명현지지시기선강도증강、감약이급강도돌변，능구지시배경장변화（랭공기침입）등；기여기선강도변화적주기불동，재강도증강혹감약계단，경사도삼수시경과쾌속괄응성조정재완성료대열대기선변화과정적공헌。인차，순TC-VGP삼수적계산화연구결과실현료대우열대기선내부삼유결구특정적정량묘술，가이준학파악열대기선강도화변화추세，병대열대기선적감측、예보구유일정업무삼고개치。
There are many challenges in tropical cyclone (TC)intensity theoretical study and forecasting,and di-agnostic analysis and mechanism study will help improve the understanding and predication of TC intensity evolution.And revealing TC internal structure is one of efficient methods.It is satisfying to find that TC structure and its environmental field can even be described by satellite measurements.Especially,for the applications with some microwave instruments can provide TC vertical temperature profiles to help detec-ting the TC internal structure,such as NOAA/AMSU-A (advanced microwave sounding unit-A)on board the polar satellites.By using NOAA/AMSU-A retrieved temperature data,more details of TC vertical structure evolution could be presented,Therefore,an objective method describing the vertical symmetry is originally proposed,which focuses on how to calculate a vertical structure index with the combined infor-mation from observations,which including the TC track and strength from CMA-STI data. <br> In this method,the tropical cyclone vertical gradient parameter (FTC-VGP )is defined,and several prom-inent features for the TC upper warm-core variation in aspects of altitude,temperature anomaly and the warm core center location are considered for calculation.This parameter ofFTC-VGP describe the TC upper warm-core declined from their low level circulation,it reflects the three-dimensional thermal structural in-formation.And for this calculating method of TC internal structure,typical TCs occurs in the South China Sea and the Northwest Pacific during 2009-2011 are selected as the examples,FTC-VGP time series of all TC samples are calculated,and while the relationship betweenFTC-VGP and TC intensity evolution are inspec-ted,results can be divided into three main parts. <br> One of results demonstrates thatFTC-VGP is well fitted to the TC intensity and indicating the TC inten-sity evolution process,anomalous and abrupt points of TC intensity in the time sequence can be found byFTC-VGP .That is,FTC-VGP abnormal inflection point indicates TC strength mutation.The second,intensity analysis result is about the relationship betweenFTC-VGP and environmental circulation.When the variation between TC intensity andFTC-VGP is found opposite trend,the intensity evolution cause is considered from other influences.It shows that sometimes intensity decrease is not caused by vertical structure changes, but by environmental cold air.Another important conclusion shows thatFTC-VGP has a fast adaptive adjust-ment process to contribute to TC intensity,for example,during the TC strengthening process,theFTC-VGP increasing and decreasing generate the TC development.The result also presents the intensity changes with their internal cloud structure.In brief,FTC-VGP can give a quantitative description of TC internal three-dimensional structure characteristics,showing important reference value for grasping TC intensity and trends accurately,as well as TC monitoring and forecasting.