Regime shift of skeletal δ13C after 1997/1998 El Nino event in Porites coral from Green Island, Taiwan
Journal
Scientific Reports
Journal Volume
14
Journal Issue
1
ISSN
2045-2322
Date Issued
2024-10-07
Author(s)
Abstract
The 1997/1998 El Niño event caused mass coral bleaching and mortality in many tropical and subtropical regions, including corals on Green Island, Taiwan, in the northwestern Pacific Ocean. This study analyzed coral carbon isotope ratios (δ13C), oxygen isotope ratios (δ18O), and Sr/Ca ratios for 29 years, including the 1997/1998 El Niño period, to examine how high water temperature events are recorded in coral geochemical indicators. Sr/Ca ratios in coral skeletons from Green Island show the lowest peak, means the highest temperature during the 1997/1998 El Niño period. However, we couldn’t observe high-temperature events on δ18O. Furthermore, a negative δ13C shift was observed after El Niño events. The regime shift of δ13C might have been caused by temporal bleaching and/or a decrease in symbiotic algae due to high water temperature stress under the continuous decrease in δ13C in DIC due to the Suess effect
Subjects
Animals
Anthozoa
Carbon Isotopes
Coral Reefs
El Nino-Southern Oscillation
Islands
Oxygen Isotopes
Pacific Ocean
Taiwan
Temperature
carbon
oxygen
animal
coral reef
El Nino
island (geological)
metabolism
physiology
temperature
Publisher
Springer Science and Business Media LLC
Type
journal article