Remote sensing analysis of marine heatwaves and Typhoon Hinnamnor (2022) in the Western Pacific

Thi-Kieu-Diem Nguyen; Po-Chun Hsu

doi:10.1117/12.3042636

3 January 2025 Remote sensing analysis of marine heatwaves and Typhoon Hinnamnor (2022) in the Western Pacific

Thi-Kieu-Diem Nguyen, Po-Chun Hsu

Author Affiliations +

Proceedings Volume 13262, Remote Sensing of the Atmosphere, Clouds, and Precipitation VIII; 1326208 (2025) https://doi.org/10.1117/12.3042636
Event: Asia-Pacific Remote Sensing, 2024, Kaohsiung, Taiwan

Abstract

This study utilizes remote sensing analysis to investigate the interaction between a marine heatwave (MHW) and Typhoon Hinnamnor (2022) in the Western Pacific Ocean. An extreme MHW developed in two subregions (122-150°E, 20-28°N (box A) and 122-132°E and 26-35°N (box B)), reaching category 3 in box A due to a shallow mixed layer depth (MLD), increased upper-ocean stratification, and substantial heat fluxes. These conditions elevated the sea surface temperature (SST) to 31°C and caused subsurface warming, creating an energy-rich environment along Typhoon Hinnamnor’s path. This MHW facilitated the rapid intensification of Hinnamnor, which reached peak intensity at an unprecedented speed. In turn, Typhoon Hinnamnor disrupted the MHW through intense wind-driven mixing, which deepened the mixed layer, cooled the surface, and diminished the subsurface heat content. This cooling effect reduced the SST anomalies post- Hinnamnor, with a slower recovery observed in the deeper layers, suggesting long-term impacts on ocean stratification. By analyzing high-resolution satellite SST data and ocean reanalysis models, we quantified changes in SST, mixed layer depth (MLD), ocean heat content (OHC), and average temperature within the upper 100 meters (𝑇_{1̅̅0̅̅0̅} ). The results underscore the feedback mechanisms between MHWs and tropical typhoons, showing how MHWs can fuel typhoon intensification while typhoons can disrupt these warming events. This study contributes to a better understanding of compound extreme events in a warming climate. It underscores the importance of monitoring surface and subsurface ocean changes to improve resilience and preparedness for coastal ecosystems and communities impacted by extreme marine and atmospheric phenomena.

(2025) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Thi-Kieu-Diem Nguyen and Po-Chun Hsu "Remote sensing analysis of marine heatwaves and Typhoon Hinnamnor (2022) in the Western Pacific", Proc. SPIE 13262, Remote Sensing of the Atmosphere, Clouds, and Precipitation VIII, 1326208 (3 January 2025); https://doi.org/10.1117/12.3042636

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KEYWORDS

Ocean optics

Remote sensing

Analytical research

Environmental monitoring

Interpolation

Modulation

Water

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