Accumulation of organic carbon in the Laptev Sea

Composition and accumulation rates of organic carbon in Holocene sediments provided data to calculate an organic carbon budget for the Laptev Sea continental margin. Mean Holocene accumulation rates in the inner Laptev Sea vary between 0.14 and 2.7 g C cm**2/ky; maximum values occur close to the Lena River delta. Seawards, the mean accumulation rates decrease from 0.43 to 0.02 g C cm**2/ky. The organic matter is predominantly of terrigenous origin. About 0.9*10**6 t/year of organic carbon are buried in the Laptev Sea, and 0.25*10**6 t/year on the continental slope. Between about 8.5 and 9 ka, major changes in supply of terrigenous and marine organic carbon occur, related to changes in coastal erosion, Siberian river discharge, and/or Atlantic water inflow along the Eurasian continental margin.

全新世（Holocene）沉积物中的有机碳组成与累积速率数据，被用于计算拉普捷夫海（Laptev Sea）大陆边缘的有机碳收支。拉普捷夫海内部全新世平均有机碳累积速率介于0.14至2.7 g C cm²/ky之间，峰值出现在勒拿河三角洲（Lena River Delta）附近；向海方向，平均累积速率从0.43降至0.02 g C cm²/ky。该区域有机质主要为陆源成因。拉普捷夫海海域每年约有0.9×10⁶吨有机碳被埋藏，大陆坡区域年埋藏量为0.25×10⁶吨。在约8.5至9千年（ka）期间，陆源与海源有机碳的输入发生显著变化，这与海岸侵蚀、西伯利亚河流径流量变化，以及/或沿欧亚大陆边缘流入的大西洋水团变化相关。