[A-CG34] Climate Variability and Predictability on Subseasonal to Multidecadal Timescales

[ACG34-P01] Spatiotemporal variations of marine heatwave properties in the
Indonesian seas

*Ratu Almira Kismawardhani¹, Toshio Suga^1,2 (1.Graduate School of Science, Tohoku University, 2.Japan Agency for Marine-Earth Science and Technology)

Keywords:Marine heatwaves, Indonesia Maritime Continent

Indonesian Maritime Continent (IMC) has suffered from remarkably marine heatwaves events over the recent decades. Even though, the number of MHW research is rapidly growing, the records of the MHW history studies in IMC is remained very limited and poorly explored whereas IMC is located at the main coral triangle areas. We used OI-SST (Optimum Interpolation Sea Surface Temperature) equipped with 0.25⁰ latitude x 0.25⁰ high resolution grid and calculated its occurrences from 1981 to 2020 for about 39 years satellite data observation. Firstly, we analyzed the spatiotemporal patterns of surface MHW prior to understand the occurrences of MHW events. We identify MHW as the sea surface temperature anomaly prolonging to more than 5 days occurrences following the definition and calculation of Hobday et al (2016). Then, we provide the information of which areas within IMC seas contented the main characteristics of MHW such as the longest duration, highest intensity, and the number of occurrences of MHW. We found the coherency of which MHW took place within the area of observation. The result shows that the MHW events centered in South Java seas, southern seas of Indonesia. In conclusion, this study provides basic statistics to serve as a benchmark for the characterization of MHW events in IMC seas and contributes to filling the gap in the scope of global MHW research from a regional perspective.