Details

Autor(en) / Beteiligte

• Chen, Tianran
• Yu, Kefu
• Zhao, Jianxin
• Yan, Hongqiang
• Song, Yinxian
• Feng, Yuexing
• Chen, Tegu

Titel

Testing coral paleothermometers (B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ18O) under impacts of large riverine runoff

Ist Teil von

• Acta oceanologica Sinica, 2015-08, Vol.34 (8), p.20-26

Ort / Verlag

Beijing: The Chinese Society of Oceanography

Erscheinungsjahr

2015

Link zum Volltext

Quelle

SpringerLink

Beschreibungen/Notizen

• Sea surface temperature (SST) proxies including B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ 18 O were analyzed in the skeleton of a Porites coral collected from the Zhujiang River (Pearl River) Estuary (ZRE). These geochemical proxies are influenced by river runoff and this area of the northern South China Sea is strongly affected by seasonal freshwater floods. We assessed the robustness of each SST proxy through comparison with the local instrumental SST. Coral Sr/Ca shows the highest correlation with SST variations ( r 2 =0.59), suggesting Sr/Ca is the most robust SST proxy. In contrast, coral δ 18 O ( r 2 =0.46), B/Ca ( r 2 =0.43) and U/Ca ( r 2 =0.41) ratios were only moderately correlated with SST variations, suggesting that they are disturbed by some other factors in addition to SST. The poor correlation ( r 2 =0.27) between SST and Mg/Ca indicates that Mg/Ca in coral skeletons is not a simple function of SST variations. This may ultimately limit the use of Mg/Ca as a coral paleothermometer.