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All Journal JURNAL METEOROLOGI DAN GEOFISIKA
Siswanto Siswanto
Center for Marine Meteorology Indonesia Meteorological Climatological and Geophysical Agency (BMKG)
Earth & Planetary Sciences Energy Physics

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AIR-SEA INTERACTION MECHANISMS IN THE GENERATION OF PERSISTENCE LOW PRESSURE AREA OVER THE EASTERN INDIAN OCEAN SOUTHWEST SUMATERA OBSERVED DURING THE INDONESIA PRIMA 2017 FIELD CAMPAIGN Siswanto Siswanto; Edi Kusmanto; Sri Puji Rahayu
Jurnal Meteorologi dan Geofisika Vol 19, No 1 (2018)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1075.101 KB) | DOI: 10.31172/jmg.v19i1.523

Abstract

Pengamatan laut bawah permukaan sampai kedalaman 1000m telah dilakukan selama Expedisi Indonesia PRIMA 2017 dengan meluncurkan instrumen Conductivity Temperature Depth (CTD). Terdapat tujuh stasiun CTD yang terletak di jalur ArusKatulistiwaSelatan (South Equatorial Current, SEC). Pengamatan atmosfer telah dilakukan dengan pelepasan balon radiosonde hingga ketinggian 17 km dan pengamatan meteorologisinoptiktiap jam di atas kapal. Makalah ini membahas analisis data kelautan bawah permukaan (suhu dan salinitas)serta konvektifitas atmosfer yang diperoleh pada saat etape I expedisi menuju 12LS 85BT untuk menyelidiki kemungkinan terusan massa air Arus Lintas Indonesia(ARLINDO) di Samudra Hindia dan kaitannya dengan dinamika pusat tekanan rendah atmosfer di Samudera Hindia barat daya Sumetera. Analisis menunjukkan bahwa terdapat interaksi timbal balik laut-atmosfer pada saat berkembangnya daerah tekanan rendah di Samudera Hindia barat daya Sumatera yaitu keberadaan kolam air yang lebih panas (>28C) dari sekitarnya yang berasosiasi dengan pusat tekanan rendah atmosfer di atasnya. Kolam air hangat berasal dari massa air intrusif yang diduga berkaitan dengan penetrasi massa air ARLINDO di Samudera Hindia. Sea sub-surface observations down to 1000m depth have been done during Expedition Indonesia PRIMA 2017 Indonesia by launching Conductivity Temperature Depth (CTD) instrument. There are seven CTD stations located on the South's Equatorial Current (SEC) pathway. Observations of the atmosphere have been done by releasing radiosonde balloons up to a height of 17 km and the hourly synoptic meteorological observation on board. This paper discusses the analysis of sub-surface marine data (temperature and salinity) as well as atmospheric convectivity obtained at the ship time of Stage I of the Expedition towards 12S 85E to investigate the possibility of Indonesia Throughflow (ITF) water masses penetration in the Indian Ocean and its relation to the dynamics of the atmospheric low-pressure center in the Indian Ocean southwest of Sumatera. The analysis shows that there is an air-sea interaction at the time of the development of the low-pressure-area in the region i.e. the presence of a warm pool region (> 28°C) associated with a low-pressure atmospheric center. The warm pool is possible came from intrusive water masses suspected to be associated with ITF's water mass penetration in the Indian Ocean.
ANALISIS MASA AIR DAN ESTIMASI TRANSPORT ARUS BAWAH EKUATOR PADA BUJUR 90°E SELAMA INDONESIA PRIMA 2017 Edi Kusmanto; Siswanto Siswanto
Jurnal Meteorologi dan Geofisika Vol 19, No 2 (2018)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v19i2.522

Abstract

Arus bawah permukaan khatulistiwa (Equatorial Undercurrent, EUC) memainkan peran penting dalam dinamika Samudra Hindia bagian timur. EUC menyuplai massa air dengan salinitas tinggi yang masuk ke perairan Indonesia. Artikel ini mengkaji EUC dan analisis massa airnya di Samudera Hindia bagian timur pada bujur 90°E dari lintasan 2°S – 2°N pada tanggal 1 – 3 Maret 2017 yang merupakan bagian dari ekspedisi “Indonesia Initiative on maritime Observation and Analysis” (Indonesia Prima 2017). Hasil analisis data suhu, salinitas, dan sigma – t yang diperoleh dari instrumen conductivity, temperature and depth (CTD) pada lima stasiun (CTD11–CTD14) dan profil arus dari Shipboard Acoustic Doppler Current Profiles (SADCP) menunjukkan adanya asupan massa air bersalinitas tinggi dari Laut Arab (Arabian Sea High Salinity Water, ASHSW) yang dicirikan oleh salinitas maksimum (35.15 - 35.2 PSU) pada rentang suhu 18°C - 23°C dan densitas 23 – 25 kg/m3. ASHSW dibawa oleh EUC dari Samudera Hindia bagian barat pada lapisan termoklin atas. Ditemukan bahwa EUC selama penelitian ini memiliki kecenderungan karakteristik berupa asimetris lebih kuat ke arah utara khatulistiwa. EUC mengalir ke timur dengan kecepatan maksimum 94 cm/sec. Estimasi transport massa air pada poros EUC berdasarkan kontur salinitas 35.15 dan 35.2 PSU masing masing sebesar  ̴ 3.4 Sv dan  ̴ 1.4 Sv, sedangkan pada salinitas 35.00 – 35.10 PSU sebesar  ̴ 8.7 Sv. Estimasi total transport massa air EUC pada penelitian ini sebesar  ̴ 13.5 Sv. Equatorial Undercurrent (EUC) plays an important role in the dynamic of the eastern Indian Ocean. EUC supplies water masses with high salinity into Indonesian waters. This article examines the EUC and its water mass characteristics at 90°E across 2°S - 2°N on 1st - 3rd March 2017 which is part of the Initiative on Maritime Observation and Analysis Expedition (Indonesian Prima 2017). The analysis of temperature, salinity, and sigma-t data obtained from conductivity, temperature and depth (CTD) instruments at five stations (CTD11-CTD14) and current profiles of Shipboard Acoustic Doppler Current Profiles (SADCP) indicate the presence of high speed water column flowing the Arabian Sea High Salinity Water (ASHSW) as characterized by maximum salinity (35.15 - 35.2 PSU) in the temperature range of 18 ° C - 23 ° C and density of 23 - 25 kg / m3. ASHSW is carried by EUC from the western Indian Ocean at the upper thermocline layer. It was found that EUC during this study had a tendency to be asymmetrically stronger to the north of the equator. The analysis shows a maximum speed of 94 cm/sec and a transport estimated of EUC water masses based on salinity contour 35.15 and 35.2 PSU respectively of ̴ 3.4 Sv and ̴ 1.4 Sv, while at salinity 35.00 - 35.10 PSU of ̴ 8.7 Sv. The total estimated EUC mass transport calculated in this study is ̴ 13.5 Sv.
Co-Authors Edi Kusmanto Sri Puji Rahayu