MONTHLY AVERAGED TURBULENCE VARIATION ON THE SEA BETWEEN MAKASSAR STRAIT AND LOMBOK STRAIT IN 2010-2014

• Main Author: Aulia Ramadhani - NIM: 12914027 , Mega
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/28827
• Institution: Institut Teknologi Bandung

<p align="justify">Indonesia Through Flow (ITF) brings water mass from the Pacific Ocean to the Indian Ocean through the waters of Indonesia. The largest transport is through Makassar Strait. Bathymetry and morphology along the sea between Makassar Strait and Lombok Strait are very diverse and allow turbulence of water masses. Turbulence has a significant influence on the balance of heat and the dynamics of equatorial currents. Therefore, this research will analyze the turbulence variations that occur on the sea between Makassar Strait and Lombok Strait which influenced by Arlindo based on Brunt Vaisala frequency and Richardson numbers. Turbulence in Makassar Strait to Lombok Strait was assessed by calculating the stability of the water column (Brunt Vaisala) and Richardson number in 2010-2014 using monthly averages of baroclinic model model of HAMburg Shelf Ocean Model (HAMSOM) with a grid of 1 / 10o x 1 / 10o and 39 layers for Indonesian waters from 11oLU - 12oLS and 92,5oBT - 132oBT The results showed that the water column along the study area was stable and strengthened (weakened) during the east season (west season). Strengthening and weakening the stability of the water column is influenced by the input of the water mass that passes through the study area. During the east season, the water mass that passes east of the Java Sea, north of the Lombok Strait, and west of Flores Sea is dominated by high density water masses that can distort the profile of water masses. Whereas based on Richardson's number, strong turbulence occurs during the eastern season and weakens in the west season east of the Java Sea, north of the Lombok Strait, and west of Flores Sea. This happens because during the east season there is strong transport that moves from the Flores Sea to the west. Then in southern region of the Makassar Strait there is Arlindo's transport which is always strong during January and causes strong turbulence throughout all the transect area. Turbulence in the southern part of the Makassar Strait and the western part of the Flores Sea is more influenced by the IOD phenomenon with correlations of -0.37 and -0.15. This is evident when negative DM occurs in the west season which makes the column stability of the water increase and turbulence weakens from the average for 5 years. Conversely, when positive DM occurs in the east season, the stability of the water column is weakened and turbulence increases from an average of 5 years. Then in the northern part of the Lombok Strait and the eastern part of the Java Sea, turbulence is more influenced by seasonal variability as indicated by the correlation values of -0.53 and -0.63. Turbulence that occurs throughout the study area is more dominant due to the increase in vertical current velocity shear along with the strengthening of Arlindo transportation (weakening). <p align="justify">