Concentration and stable carbon isotopic composition of organic carbon of DSDP Hole 28-266

The 7% carbon-13 depletion in cold water phytoplankton provides a striking signal that is traceable in deep-sea cores taken in high latitude regions of the Southern hemisphere. This signal may be weakened by noise due to (1) terrestrially derived debris in areas close to the continents; (2) changing current patterns resulting in varying settling trajectories; (3) erosion and redeposition and (4) maturation-diagenetic effects. Data for two cores taken southwest of Australia are evaluated with respect to these interferences.

冷水浮游藻类中7%的碳-13（carbon-13）亏损特征，可在南半球高纬度区域获取的深海岩芯中被追溯识别。该信号可能会受到以下噪声因素的干扰而减弱：(1) 近陆区域的陆源碎屑输入；(2) 洋流模式变化导致沉降轨迹发生改变；(3) 侵蚀与再沉积作用；(4) 成熟成岩效应。针对取自澳大利亚西南部的两支深海岩芯数据，就上述干扰因素开展了评估分析。