[A-CG41] Satellite Earth Environment Observation

[ACG41-P21] Accurate Detection of Marine Heatwaves with the Sea Surface Temperature Data from the Himawari

*QI XIAO¹, Wei Yang¹ (1.Chiba University)

Keywords:Sea Surface Temperature, Himawari, Marine Heatwaves

Marine heatwaves (MHWs) manifest when sea surface temperatures deviate significantly, surpassing 90% of seasonal fluctuations for more than five consecutive days, with notable impacts on marine ecosystems and commercial fisheries. To date, the detection of marine heatwaves has primarily relied on NOAA OISST. However, a notable issue arises here. NOAA can provide sea surface temperature data only twice a day, leading to a high likelihood of overlooking abnormal sea temperature changes. Additionally, due to frequent cloud cover over the sea, there is a tendency for data gaps. This comprehensive study leverages observational data collected by the Himawari satellite to detect MHWs, meticulously comparing the results with NOAA data. The research delves into the spatial distribution characteristics of marine heatwaves and the discernible impact of the El Niño/La Niña phenomenon. Furthermore, the study conducts a thorough examination of the intricate mechanisms propelling marine heatwaves, exploring the influence of factors such as mixed-layer depth, ocean currents, and atmospheric temperature. The detailed analysis presented in this study not only showcases the valuable insights that Himawari sea surface temperature (SST) data can offer in understanding MHWs but also underscores the significant variability in MHW characteristics when different daily SST data types from Himawari are utilized. Moreover, the findings prominently highlight the substantial potential of Himawari for MHW detection and ongoing monitoring. In conclusion, the utilization of Himawari satellite data emerges as a powerful and indispensable tool for monitoring and comprehensively understanding these phenomena.