Stratification and Characteristic of Water Masses in Selayar Slope-Southern Makassar Strait

Isnaini Prihatiningsih,Indra Jaya,Rina Zuraida,Agus Saleh Atmadipoera

doi:10.20884/1.oa.2021.17.1.620

Isnaini Prihatiningsih, Indra Jaya + Show 2 more

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https://doi.org/10.20884/1.oa.2021.17.1.620

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Abstract

Selayar slope is the confluence of the Indonesian Throughflow (ITF) from the Makassar Strait and seasonal Java-Flores current. The CTD data from Java-Makassar-Flores (JMF) Cruise where an intensive 24-h CTD “yoyo” measurement was conducted in Selayar Slope is used to determine the stratification and characteristic of water masses in the Selayar slope - southern Makassar Strait. The analyses were performed using TS Diagram processed with Matlab and Ocean Data View (ODV). The surface potential density of 24.25 s q with stratification of water masses is dominated by Makassar ITF. The water mass with higher salinity (34.6 psu) is North Pacific Subtropical water (NPSW) and lower salinity (34.44 psu) is North Pacific Intermediate Water (NPIW). However, water mass with density above 24.25 s q caused NPSW to be drastically extracted by less-saline water (34.15 psu) originated from Java Sea, where salinity profiles are more clearly observed between surface density of 22.0 s q and 23.50 s q . . Keyword: stratification and characteristic, water mass, Selayar Slope, JMF Cruise, TS Diagram

Highlights

Selayar Slope is an encounter between the Java Sea, the Makassar Strait and the Flores Sea and passed by Indonesian Throughflow (ITF)
ITF is a mass of water migrating from the Pacific Ocean to the Indian Ocean through the Indonesian sea via two paths, the west and east path where the components of the water mass composed the mass of the North Pacific and South Pacific water (Wyrtki, 1961; Gordon and Fine, 1996)
The stratification pattern of water masses in ITF path can be seen through the vertical profile of temperature, sanity, and density (Figure 2)

Summary

Introduction

Selayar Slope is an encounter between the Java Sea, the Makassar Strait and the Flores Sea and passed by ITF. ITF is a mass of water migrating from the Pacific Ocean to the Indian Ocean through the Indonesian sea via two paths, the west and east path where the components of the water mass composed the mass of the North Pacific and South Pacific water (Wyrtki, 1961; Gordon and Fine, 1996). The west path of the ITF route is from the mass of water from the Pacific Ocean carried by the Mindanao Current penetrates into the Celebes Sea, and flows to the Indian Ocean via the Makassar Strait, towards the south into the Flores, Banda and Timor Seas. In the Makassar Strait, the mass of NPSW water was found at an average depth of 300-350 dbar (Hasanudin, 1998)

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