[A-OS20] 海洋化学・生物学一般

[AOS20-P03] 海大陸周辺海域における熱ストレスの時空間変動およびサンゴ白化との関係

*安中 さやか¹、Wirasatriya Anindya²、Wetchayont Parichat³、Tupaz Lowell⁴、Haryanti Dwi²、HananiAdiwira Hanani¹、Luciano Rhea⁴、Baria-Rodriguez Maria⁴、須賀 利雄¹ (1.東北大学、2.Diponegoro University、3.Navamindradhiraj University、4.University of the Philippines-Diliman)

キーワード：海面水温、Degree heating week、ENSO、インド洋ダイポール

Coral bleaching occurs when symbiotic dinoflagellate algae leave corals due to warming surface waters. Since the early 1980s, the number and intensity of coral bleaching events have significantly risen globally, and many coral reefs are concerned to undergo irreversible phase shifts due to global warming. This study integrated coral bleaching data, and elucidated the spatiotemporal variations of coral bleaching and heat stress in the ocean around the Maritime Continent from 1998 to 2022. Climatological mean of heat stress is large where interannual variation of SST is large, and it reaches maximum 20-70 days after the day of maximum SST climatology. Heat stress averaged over the ocean around the Maritime Continent is increasing and at the rate of 0.24 °C-day/yr from 1990 to 2022. Occurrence of coral bleaching corresponds well with the heat stress both in time and space, and the strong heat stress and severe coral bleaching were observed in the wide region of the ocean around the Maritime Continent in 1998, 2010, 2014, 2016, and 2020. Most of these years are in the transition from El Nino to La Nina and negative Indian Ocean Dipole.