기후변화가 서태평양 축산호초 해역의 산성화에 미치는 영향

Abstract

The primary goal of the present study was to explore the e:ects of large-scale climate variations on the physical and biological processes that determine carbonate chemistry of reef waters. The 7-year weekly records of carbonate chemistry conditions in the Chuuk lagoon, located in the coral-rich western Paci<c Ocean, showed that during weak intrusion of ambient seawater from the surrounding open ocean two internal biological processes (calci<cation and respiration) reinforced each other and collectively lowered the pH of the reef water for extended periods, ranging from a few to several months. Our study indicates that periods of low wind speeds weaken the intrusion of ambient water, resulting in a longer residence time of reef water so that respiration and calci<cation increase its acidi<cation. This <nding is not an isolated phenomenon, but may be widespread in the coral-rich western Paci<c Ocean, which contains 50% of global coral reefs and in which the degree of ambient water intrusion was found to be closely associated with the El Ni&ntilde o Southern Oscillation-induced wind speed change.onditions in the Chuuk lagoon, located in the coral-rich western Paci<c Ocean, showed that during weak intrusion of ambient seawater from the surrounding open ocean two internal biological processes (calci<cation and respiration) reinforced each other and collectively lowered the pH of the reef water for extended periods, ranging from a few to several months. Our study indicates that periods of low wind speeds weaken the intrusion of ambient water, resulting in a longer residence time of reef water so that respiration and calci<cation increase its acidi<cation. This <nding is not an isolated phenomenon, but may be widespread in the coral-rich western Paci<c Ocean, which contains 50% of global coral reefs and in which the degree of ambient water intrusion was found to be closely associated with the El Ni&ntilde o Southern Oscillation-induced wind speed change.