#TITLE_ALTERNATIVE#
In this research, investigation of Indonesian Throughflow (ITF) which passes Lombok Strait has been done which will be correlated to ENSO signal. Data which is used in this research are current, temperature and salinity data that was obtained from measurement of mooring deployed by International N...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/8479 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | In this research, investigation of Indonesian Throughflow (ITF) which passes Lombok Strait has been done which will be correlated to ENSO signal. Data which is used in this research are current, temperature and salinity data that was obtained from measurement of mooring deployed by International Nusantara Stratification and Transport (INSTANT) Program 2004-2005. Moorings were deployed in two locations : western part of Lombok Strait (115o45,487'E, 08o43,9'S) closed to Bali Island and eastern part (115o53,769'E, 08o40,24'S) closed to Lombok island. The mooring depth is 921 m in western part and 1144 m in eastern part. Whereas Sea Surface Temperature Anomaly in Niño 3.4 which represents the change of ENSO signal obtained from http://www.cpc.noaa.gov/data/indices/. Mooring data were processed in four step that is uniforming of sampling rate (commontime base), pressure interpolation (assign pressure), vertical interpolation, and filtering of velocity data with Low Pass Filter. <br />
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The result showed that v-component velocity move dominantly southward up to 200 m depth, while at below this depth, the velocity has an irregular pattern. This is due to the existence of a sill at 250 m depth which blocking the southward current. The maximum velocity occured in early May during the Transition Monsoon reaches 1,5 m/s at western part mooring and 0,75 m/s at eastern part mooring. <br />
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Variability of v-component current have negative correlation due to ENSO signal. On the surface, the velocity has no significant correlation, with correlation coefficient-0,39 (R2 = 0,152). The surface current is influenced by monsoonal wind. The significant correlation between velocity and ENSO signal observed in 160 m depth with correlation coefficient-0,545 (R2 = 0,297). Reversal of flow to northward at Transition Monsoon indicated by the existence of downwelling Kelvin waves intrusion from Equatorial Indian Ocean. This is also can be proved from variability of temperature and salinity where warmest temperature and lowest salinity occurred in May. <br />
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