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Ilahude, Abdul Gani
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Earth & Planetary Sciences

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ON THE OCCURRENCE OF UPWELLING IN THE SOUTHERN MAKASSAR STRAIT Ilahude, Abdul Gani
Marine Research in Indonesia Vol 10 (1970)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3642.732 KB) | DOI: 10.14203/mri.v10i0.335

Abstract

The possibility of upwelling occuring off the coast of Sulawesi in the Southern Makassar Strait has been discussed by earlier workers (see e.g. Veen 1953, and Wyrtki 1961). Surface salinity data show higher values in June or July along the southwest coast of Sulawesi than the rest area to the west of it. The months June and July coincide with the southeast monsoon in the area. It is believed that the presence of such high salinity could only be due to the process of upwelling. As already mentioned in these works (e.g. by Wyrtki, 1961) during the southeast monsoon, the west-going surface currents coming from the Northern Makassar Strait and the Flores Sea pass the area, and flow into the Java Sea. It is thought that part of the water masses transported by the currents originate from subsurface layer off Makassar coast.
SEASONAL FEATURE OF THE HYDROLOGY OF THE BALI STRAIT Ilahude, Abdul Gani
Marine Research in Indonesia Vol 15 (1975)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3283.478 KB) | DOI: 10.14203/mri.v15i0.344

Abstract

Using the data in the file of the Lembaga Oseanologi Nasional (LON = National Institute of Oceanology), Jakarta, it is shown that the hydrological features at the surface of the Bali Strait are closely related to the meteorological factors of the region. Furthermore, based on the data obtained from the four oceanographical cruises organized by LON in the strait, the features at subsurface layer are analyzed. The influence of the current system south of Java and the upwelling associated with it are also discussed.
ON THE FACTORS AFFECTING THE PRODUCTIVITY OF THE SOUTHERN MAKASSAR STRAIT Ilahude, Abdul Gani
Marine Research in Indonesia Vol 21 (1978)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3275.956 KB) | DOI: 10.14203/mri.v21i0.391

Abstract

An investigation of the upwelling in the Southern Makassar Strait was conducted by LON (Lembaga Oseanologi Nasional) as part of its research program in ecology and oceanography of the Indonesian waters. It consists of observation on one monitoring station and two oceanographical cruises in the region. The result of the monitoring station indicates clearly the occurrence of upwelling and its effect on the hydrology of the region. During the southeast monsoon the upwelled water causes a decrease in temperature and dissolved oxygen and an increase in salinity, density and nitrate-nitrogen, particularly seen at the lower boundary of the homogeneous layer. During the northwest monsoon the upwelled water is replaced by the Jawa Sea water with high temperature, low oxygen, low salinity, low density, very high phosphate, and high silicate. The observation on the oceanographical cruises reveals the precence of two other types of surface waters in the region. They are the East Kalimantan Coastal Water and the South Sulawesi Coastal Water, each is formed by mixing process of sea water and land drainage along the coast of the two islands respectively. Originally they are characterized by low salinity, low oxygen, high temperature, high phosphate, low nitrate and high silicate. Their salinity and dissolved oxygen increase due to mixing with the upwelled water and the high activity of phytoplankton respectively.
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