| 1 | DIABATIC HEATING AND CONVECTIVE ASYMMETRIES DURING RAPID INTENSITY CHANGES OF TROPICAL CYCLONES OVER NORTH INDIAN OCEAN显示文摘Rapid changes in Tropical Cyclone(TC)structure and intensity are the most diffi cult aspects of TC forecasting.The intensity and structural changes associated with rapid intensifi cation(RI)and rapid weakening(RW)instances of TCs of North Indian Ocean(NIO)are analysed based on 5 cases each for RI and RW.The vertical profi les of heat(Q_1)and moisture(Q_2)based on heat and moisture budget equations are analysed to bring out the role of diabatic heating during the RI and RW processes.The associated structural changes are analysed based on the Fourier fi rst order wave number-1 asymmetry in the precipitation patterns associated with RI and RW instances.During RI process,there are 2 predominant Q_1 maxima associated with latent heat release near the TC centre,one in the upper troposphere and the other in the lower troposphere.During RW process,there is a single dominant Q_1 and Q_2 maxima in the mid-troposphere.Regarding the structural changes,there is a pronounced front-back asymmetry in both RI and RW cases.The asymmetry amplitude in the inner core is lower in the case of RI events but,is quite high for RW events.Thus,RW events are characterised by large convective asymmetry. | B.GEETHA S.BALACHRAN | 2016 | Tropical Cyclone Research and Review2016，5，1： | 1 |
| 2 | TCRAIN–A DATABASE OF TROPICAL CYCLONE RAINFALL PRODUCTS FOR NORTH INDIAN OCEAN显示文摘Analysis of tropical cyclone(TC) rainfall characteristics helps in understanding and improving quantitative precipitation forecasts of TCs. Based on the Tropical Rainfall Measuring Mission(TRMM) rainfall data for the period of 2000-2010, a TC rainfall database –Tropical Cyclone Rainfall Analysis for North Indian Ocean(TCRAIN) is developed to study the precipitation characteristics during various stages of life cycle of TCs of the North Indian Ocean(NIO). Three rainfall products, viz., frequency distribution of rain rate, azimuthally averaged radial profile of rain rate and quadrant mean rain rate with respect to the TC centre and the direction of motion of the TC are generated in a Lagrangian frame of coordinate system for 5 intensity stages of life cycle of each cyclone over NIO. Using this TCRAIN database, composites of frequency distribution of rain rates as well as quadrant mean rain rate for TCs of NIO are generated to bring out probable rain rates and asymmetric structure in rainfall distribution. Rainfall profiles for individual cases are likely to deviate from the climatological profiles under different environmental and oceanic conditions. TCRAIN database would serve as a useful tool for carrying out intensity based analytical studies on structure of rainfall associated with cyclones of NIO through ready depiction of TC rainfall profiles. | S.BALACHANDRAN B.GEETHA K.RAMESH N.SELVAM | 2014 | Tropical Cyclone Research and Review2014，3，2： | 0 |
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