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| Autor: | Ke-Xin Lu, 盧可昕 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 Studying the microphysical processes of precipitation systems from the perspective of observations is important and challenging. During the 2008 Southwest Monsoon Experiment /Terrain-influenced Monsoon Rainfall Experiment (SoWMEX/TiMREX), huge amount of observational data were collected, which allowed us to study microphysical processes using the observations of a dual-polarimetric radar (NCAR S-POL) and disdrometers. In the first part of this research, we use vertical profiles of dual-polarimetric measurements to investigate the microphysics characteristics of seven heavy rainfall events. In the second part, we further investigate the differences of vertical structure and microphysics characteristics from different DSD results near the ground observed by disdrometers. Two distinct types of precipitating characteristics can be found in the analyses of seven heavy events. They are: (1) Deep convection (5/26 and 6/13) containing large rain drops, low liquid water content, high graupel water content and pronounced collision coalescence process. (2) Organized convection (6/5 and 6/16) with small rain drops, high liquid water content and less pronounced coalescence process. In the second part, two months of disdrometer data near the ground during the 2008 SoWMEX are classified into 48 groups. The averages of the vertical profiles of dual-polarimetric measurements above the disdrometer are used to analyze the differences of microphysical processes based on these 48 groups. The results indicate that large and high concentration raindrops are associated with large ZHH, KDP at Z = 1.0 km, deep convection, as well as pronounced collision coalescence process. In addition, the value of ZDR is proportional to the size of raindrops. The results are consistent with those from the first part. Overall, this study successfully demonstrates the application of combining dual-polarimetric and disdrometer data to investigate the microphysical processes in heavy rainfall events. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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