DAMPAK SIKLON TROPIS FRANCES TERHADAP UPWELLING LAUT TIMOR DAN SEKITARNYA
The impacts of tropical cyclone are rainfall, strong wind, and flood. On the other hand, tropical cyclone becomes one of the factors that trigger the vertical mixing and upwelling that lead to increased fertility. Research on the impact of tropical cyclones on chlorophyll-a concentrations in Indonesian is still limited. This study aims to determine the effect of tropical cyclones on upwelling in the waters of the Timor Sea and its surroundings. Data used is daily composite of chlorophyll-a concentration, sea surface temperature, monthly of chlorophyll-a concentration, sea surface temperature, wind velocity and direction period May 2002 - May 2016. The method used in this study is the analysis of spatial and temporal of chlorophyll-a concentration, sea surface anomaly, sea surface temperature, wind velocity and direction. A daily composite analysis of the concentration of chlorophyll-a shows that the area traversed by Frances tropical cyclones have increased fertility but with different responses to the observation area. The value of chlorophyll-a concentration before cyclone occurred between <0.2 mg / m3 - 1.0 mg / m3 and increased of 0.4 mg / m3 - 5.0 mg / m3. While anomalous result of sea level rise shows that at the time of the occurrence of tropical cyclones there is a positive anomaly ranging from 0.4 to 0.7 meters in the region around the center of tropical cyclone. This is caused by a decrease in pressure that causes the movement of the rising water mass to the surface (upwelling). Sea surface temperature showed a decrease with the highest decline 2.0oC within 1 - 4 days post tropical cyclone Frances.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.