Spatial and temporal pattern of thermal front in Republic of Indonesia fisheries management area 571 (FMA 571)
Annisa Aulia Lukman1, Ayi Tarya2, Widodo Setiyo Pranowo3,4

1Department of Earth Science, Faculty of Earth Science and Technology, Bandung Institute of Technology, Ganesha Street No. 10, Bandung, 40132, Indonesia
2Research Group of Oceanography, Faculty of Earth Science and Technology, Bandung Institute of Technology, Ganesha Street No. 10, Bandung, 40132, Indonesia
3Department of Oceanography, The Indonesian Naval Postgraduate Military Service School (STTAL), West Kelapa Gading, Jakarta, 14240, Indonesia
4Research Center for Climate & Atmosphere, National Research & Innovation Agency, Indonesia

Abstract

The spatial pattern of thermal front were obtained by processing sea surface temperature (SST) data using the Single Image Edge Detection (SIED) method. The aim of this research is to determine the characteristics of the thermal front in the Republic of Indonesia Fisheries Management Area (FMA) 571 based on its spatial and temporal map in the year of 2010-2020. SST & chlorophyll-a of AquaMODIS satellite imagery and FMA 571 bathymetry of the Indonesian Geospatial Information Agency datas is used in this research. This research result that the maximum & the minimum average thermal front are found in the southwest monsoon and the first inter-monsoon with values of 135 and 39 events, respectively. The maximum (minimum) SST average is 32.182oC (30.483oC) and the maximum (minimum) chlorophyll-a concentration average value is 6.547 mg/l (4.048 mg/l). Spatially numerous thermal fronts found in northern than in the southern region of FMA 571. It is indicated that thermal front formation in southern region is influenced by the variability of chlorophyll-a concentrations while in the northern region, thermal front influenced by FMA^s 571 bathymetry pattern.

Keywords: thermal front, sea surface temperature, chlorophyll-a, SIED

Topic: Ocean Remote Sensing and Marine Technology