The effect of upwelling on water productivity based on chlorophyll-a parameters in Sumatra and Java Waters (Edge of Jakarta Bay, South Lampung and South Coast of Central Java)

Abstract

A natural phenomenon in the form of rising fish to land that has occurred recently has been occurring in several waters. Some of these waters are located in the Ujung Teluk Jakarta area to be precise at Mutiara Beach, then followed within a few consecutive days in South Lampung, and the coast of Central Java to be precise at Bopong Beach. Upwelling is the movement of seawater masses that contain higher nutrients to the surface due to pressure from the sea. This study aims to determine the effect of upwelling on water productivity. The observation method uses ENSO and IOD analysis and predictions in December which show Moderate La Nina conditions. The Meteorology, Climatology and Geophysics Agency explained that the flow of air masses is dominated by westerly winds, resulting in a meeting of winds in Lampung and Banten. Upwelling is an indicator of the large concentration of fish rising from the sea coast to the mainland, so that many fishermen get fish without having to go to sea. This indicator can be used to observe the linkage of potential fishing grounds to fishery production. The high primary productivity of the waters makes fish go ashore in large quantities. One of the factors influencing extreme climate change is the end of 2022 and is predicted to continue until 2023.