The University of Arizona
Open Access Open Access  Restricted Access Subscription or Fee Access

INTERANNUAL 14C VARIATIONS DURING 1977-1998 RECORDED IN CORAL FROM DAYA BAY, SOUTH CHINA SEA

C D Shen, W X Yi, Y M Sun, Y Yang, B Zhou

Abstract


Twenty-two annually banded samples of coral from 1977 to 1998 were collected from Daya Bay, South China Sea, and bomb 14C concentrations were determined. The interannual variation of coral ∆14C is controlled mainly by oceanic factors. In ENSO years, the coastwise upwelling current of the South China Sea has been intensified; hence, the coral ∆14C displays its minimum value. The interannual variation curve of ∆14C in coral bears a relationship with the Southern Oscillation Index (SOI) curves: the correlation coefficient between ∆14C and (SOI)w is 0.43 and the correlation coefficient between ∆14C and (SOI)y is 0.27. The coral ∆14C has no remarkable response to the variation of solar radiation energy. In the past 20 yr or so, the general situation and oceanic thermal structure of the South China Sea are still stable even though interannual variations in atmosphere-sea interaction and upwelling current driven by the tropical energy have occurred.

Full Text:

PDF