ANALYSIS OF DIABATIC HEATING PROFILES ASSOCIATED WITH MESOSCALE CONVECTIVE SYSTEMS OVER THE EASTERN INDIAN OCEAN USING DATA FROM RADIOSONDE AND GPS RO OBSERVATIONS
This study mainly concerns with the characteristics of diabatic heating profiles associated with the appearances of Mesoscale Convective Systems (MCSs) over Sumatra Island (SI) and its adjacent Indian Ocean (IO), including the transitional off shore zone (TZ). The MCSs were identified from Multi-fun...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/33672 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | This study mainly concerns with the characteristics of diabatic heating profiles associated with the appearances of Mesoscale Convective Systems (MCSs) over Sumatra Island (SI) and its adjacent Indian Ocean (IO), including the transitional off shore zone (TZ). The MCSs were identified from Multi-functional Transport Satellite (MTSAT) infrared imageries with algorithm that takes eccentricity, cloud lifetime, and cloud coverage as defining parameters. The diabatic heating is calculated from radiosonde data obtained during Cooperative Indian Ocean Experiment on Intraseasonal Variability in the Year 2011 (CINDY2011) / Dynamics of the Madden Julian Oscillation (DYNAMO). In addition, GPS Radio Occultation (RO) and European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis data were also incorporated in TZ where radiosonde observations were insufficient.
The results show that in all areas (SI, IO, and TZ), during the mature stage of MCSs, heating occurred in the entire troposphere. However, maximum heating over land is located at lower altitude compared to that of the oceanic and transitional area. In the dissipation (post mature) stage, heating profiles of the dissipation stage were characterized by cooling in the lower troposphere and upward shift of maximum heating location for SI and TZ areas. The vertical velocity profiles showed that heating and cooling are mainly associated with updraft and downdraft in the cloud systems. In this study, the fact that heating profiles over open ocean (IO) area did not exhibit cooling in the lower troposphere needs further confirmation because radiosonde data were sampled at shorter time interval. |
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