Hill T M, Kennett J P, Valentine D L, Yang Z, Reddy C M, Nelson R K, Behl R J, Robert C, Beaufort L
Department of Earth Science and Marine Science Institute, University of California, Santa Barbara, CA 93106, USA.
Proc Natl Acad Sci U S A. 2006 Sep 12;103(37):13570-4. doi: 10.1073/pnas.0601304103. Epub 2006 Aug 30.
Marine hydrocarbon seepage emits oil and gas, including methane ( approximately 30 Tg of CH(4) per year), to the ocean and atmosphere. Sediments from the California margin contain preserved tar, primarily formed through hydrocarbon weathering at the sea surface. We present a record of variation in the abundance of tar in sediments for the past 32,000 years, providing evidence for increases in hydrocarbon emissions before and during Termination IA [16,000 years ago (16 ka) to 14 ka] and again over Termination IB (11-10 ka). Our study provides direct evidence for increased hydrocarbon seepage associated with deglacial warming through tar abundance in marine sediments, independent of previous geochemical proxies. Climate-sensitive gas hydrates may modulate thermogenic hydrocarbon seepage during deglaciation.
海洋烃类渗漏向海洋和大气排放石油和天然气，包括甲烷（每年约30太克的CH₄）。加利福尼亚边缘的沉积物中含有保存下来的焦油，主要是通过海面的烃类风化形成的。我们展示了过去32000年沉积物中焦油丰度的变化记录，为末次冰消期IA（16000年前（16 ka）至14 ka）之前和期间以及末次冰消期IB（11 - 10 ka）期间烃类排放增加提供了证据。我们的研究通过海洋沉积物中的焦油丰度，提供了与冰消期变暖相关的烃类渗漏增加的直接证据，独立于先前的地球化学指标。对气候敏感的天然气水合物可能在冰消期调节热成因烃类渗漏。
