IMPACT OF TROPICAL CYCLONES CEMPAKA AND DAHLIA TO THE VARIABILITY OF CHLOROPHYLL-A AND SEA SURFACE TEMPERATURE IN THE SEAS SOUTHERN COAST OF JAVA ISLANDHilmi Natan Aditya, Anindya Wirasatriya, Kunarso, Dwi Haryo Ismunarti, Muh. Yusuf, Azis Rifai, Purwanto1, Aris Ismanto and Rikha Widiaratih
Tropical Cyclone (TC) Cempaka and Dahlia are the consecutive cyclones that happen in Southern coast of Java waters, in November to December 2017. The purpose of this research is to investigate daily characteristic from TC Cempaka and Dahlia based on wind velocity, curl, and Ekman Pumping as surface wind component in accordance with the distribution of chlorophyll-a and Sea Surface Temperature (SST) by remote sensing. Wind Pattern Component Data will be used to indentify pattern, velocity, and direction of the movement of the tropical cyclone. Curl component data will be used to support tropical cyclone rotation pattern identification, while Ekman Pumping will be used to identify the existence of upwelling. Chlorophyll-a and SST will be overlayed with the surface wind parameter to be analyzed for its relation with the other parameters. Result show that during the occurrences of TC Cempaka and Dahlia, wind velocity increase up to 10-19 m/s. TC Cempaka and Dahlia movement shift from Northwest to Southeast direction. There is a connection between TC Cempaka and Dahlia with the chlorophyll-a and SST. When the wind velocity increased along with the strengthening of positive curl and negative Ekman Pumping, upwelling is generated leading to the increase of clorophyll-a and the decrease of SST.