Responses of long-chain alkenone unsaturation index-sea sarface temperatare in stratigraphic record and zooplankton community in the Sanmen Bay to El Nio/La Nia phenomina

ZHANG Hai-sheng; NING Xiu-ren; LE Feng-feng; HU Xi-gang; LIU Zhen-sheng; LU Bing

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ZHANG Hai-sheng, NING Xiu-ren, LE Feng-feng, HU Xi-gang, LIU Zhen-sheng, LU Bing. Responses of long-chain alkenone unsaturation index-sea sarface temperatare in stratigraphic record and zooplankton community in the Sanmen Bay to El Nio/La Nia phenomina[J]. Haiyang Xuebao, 2010, 32(3): 40-50.

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Responses of long-chain alkenone unsaturation index-sea sarface temperatare in stratigraphic record and zooplankton community in the Sanmen Bay to El Nio/La Nia phenomina

Key Laboratory of State Oceanic Administration for Submarine Geoscience, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2009-02-23
Rev Recd Date: 2010-03-09

Abstract

Abstract

The sea surface temperature (SST) was estimated by the record of long-chain alkenone unsaturation index in the Sanmen Bay sediment. The calculated result shows that SST fluctuation ranges from 15.97 to 18.00 ℃,and average is 17.03 ℃. The calculated value is lower than the annual measured value 3.52 ℃ in the same year. At one time, the stratigraphic record history of El Nio in the Sanmen Bay sediment was reescablished using the relatimship of long-chain alkenone unsaturation index with SST.The research indicates that change of climate event of large scale in the Sanmen Bay is same to that of the Pacific Ocean, both are major influenced by the climate factor. The event corresponds with each other in form and age, but its range of fluctuation is inferior to the Pacific Ocean because of the effect of location and monsoon. A series of characteristics of macrobenthos including the signal of community structure change, biomass, density of inhabit and biodiversity was compared both in the periods of El Nio and non-El Nio. The research indicates that zooplankton species, the biomass and the abundance have the high tendency in the period of El Nio. That was because the intensity of the warm current invasion increased, and warm-water zooplankton was carried into the Samen Bay.
- Sanmen Bay,
- stratigraphic record,
- long-chain alkenone unsaturation index,
- sea surface temperature,
- El Nio event,
- zooplankton

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