How much do we know about the 88-91 regime shift in the southwestern East Sea ecosystem?

Title
How much do we know about the 88-91 regime shift in the southwestern East Sea ecosystem?
Author(s)
유신재; 장찬주; 윤주은; 이순미
KIOST Author(s)
Jang, Chan Joo(장찬주)
Publication Year
2014-10-20
Abstract
We investigated the 88-91 regime shift in the southwestern East Sea ecosystem by reconstructing a long-term chlorophyll-a time series from Secchi depth data for 1970-2005. The chlorophyll-a time series showed that a statistically significant shift occurred at 89/90, which is consistent with shifts in a number of climatic, oceanographic, and biological variables with a slight time lag before and after the chlorophyll-a shift. We put forward a hypothesis that several factors, anthropogenic and climate change-related, worked together to induce the jump in the lower trophic level: continuously increasing atmospheric deposition of anthropogenic nitrogen, continuously increasing nitrate loading of the Changjiang river, and sudden increase of Changjiang discharge around 1989. These effects might have been amplified by an increase in the volume transport of Tsushima Warm Current in 1988 leading to nitrogen enrichment in the south East Sea. If such is the case, the 89-91 regime shift in the East Sea ecosystem presents an interesting case where climate change and anthropogenic forcing interacted and produced synergistic effects leading to a step change. We will also discuss further questions such as linkage to large-scale variability and trophic interactions.t shift occurred at 89/90, which is consistent with shifts in a number of climatic, oceanographic, and biological variables with a slight time lag before and after the chlorophyll-a shift. We put forward a hypothesis that several factors, anthropogenic and climate change-related, worked together to induce the jump in the lower trophic level: continuously increasing atmospheric deposition of anthropogenic nitrogen, continuously increasing nitrate loading of the Changjiang river, and sudden increase of Changjiang discharge around 1989. These effects might have been amplified by an increase in the volume transport of Tsushima Warm Current in 1988 leading to nitrogen enrichment in the south East Sea. If such is the case, the 89-91 regime shift in the East Sea ecosystem presents an interesting case where climate change and anthropogenic forcing interacted and produced synergistic effects leading to a step change. We will also discuss further questions such as linkage to large-scale variability and trophic interactions.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25941
Bibliographic Citation
PICES 2014, pp.10, 2014
Publisher
PICES
Type
Conference
Language
English
Publisher
PICES
Related Researcher
Research Interests

upper ocean dynamics,regional climate modeling,ocean climate change,해양상층역학,지역기후모델링,해양기후변화

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