Climatically driven emissions of hydrocarbons from marine sediments during deglaciation

Marine hydrocarbon seepage emits oil and gas, including methane (≈30 Tg of CH4 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.

[1]  H. G. Greene,et al.  under a Creative Commons License. Natural Hazards and Earth System Sciences Submarine landslides in the Santa Barbara Channel as potential tsunami sources , 2022 .

[2]  K. Kvenvolden,et al.  Gaia's breath—global methane exhalations , 2005 .

[3]  J. Clark,et al.  Hypothesis for increased atmospheric methane input from hydrocarbon seeps on exposed continental shelves during glacial low sea level , 2005 .

[4]  J. Chanton,et al.  Thermogenic gas hydrates in the northern Cascadia margin , 2004 .

[5]  Grant Garven,et al.  Evolution of a hydrocarbon migration pathway along basin-bounding faults: Evidence from fault cement , 2004 .

[6]  R. Rosenbauer,et al.  Geochemical characterization of tarballs on beaches along the California coast. Part I— Shallow seepage impacting the Santa Barbara Channel Islands, Santa Cruz, Santa Rosa and San Miguel , 2004 .

[7]  Peter U Clark,et al.  Rapid Rise of Sea Level 19,000 Years Ago and Its Global Implications , 2004, Science.

[8]  T. Hill,et al.  Foraminifera as indicators of methane-rich environments: A study of modern methane seeps in Santa Barbara Channel, California , 2003 .

[9]  Martin J. Siegert,et al.  EOS Trans. AGU , 2003 .

[10]  C. Paull,et al.  Cruise summary for P-1-02-SC: acoustic imaging of natural oil and gas seeps and measurement of dissolved methane concentration in coastal waters near Pt. Conception, California , 2003 .

[11]  E. Roark,et al.  Apparent synchroneity of submillennial scale climate events between Greenland and Santa Barbara Basin, California from 30-10 ka , 2002 .

[12]  A. Gorman,et al.  Migration of methane gas through the hydrate stability zone in a low-flux hydrate province , 2002 .

[13]  I. Leifer,et al.  Temporal variation in natural methane seep rate due to tides, Coal Oil Point area, California , 2001 .

[14]  J. M. Hayes,et al.  Comparative Analysis of Methane-Oxidizing Archaea and Sulfate-Reducing Bacteria in Anoxic Marine Sediments , 2001, Applied and Environmental Microbiology.

[15]  I. Leifer,et al.  Modifications of the local environment by natural marine hydrocarbon seeps , 2000 .

[16]  Behl,et al.  Carbon isotopic evidence for methane hydrate instability during quaternary interstadials , 2000, Science.

[17]  Brook,et al.  Abrupt climate change at the end of the last glacial period inferred from trapped air in polar Ice , 1999, Science.

[18]  Derek C. Quigley,et al.  The world's most spectacular marine hydrocarbon seeps (Coal Oil Point, Santa Barbara Channel, California): Quantification of emissions , 1999 .

[19]  Alexei V. Milkov,et al.  Thermogenic gas hydrates and hydrocarbon gases in complex chemosynthetic communities, Gulf of Mexico continental slope , 1999 .

[20]  J. Kennett,et al.  Brief interstadial events in the Santa Barbara basin, NE Pacific, during the past 60 kyr , 1996, Nature.

[21]  K. Kvenvolden.  Gas hydrates—geological perspective and global change , 1993 .

[22]  C. Lorius,et al.  Ice-core record of atmospheric methane over the past 160,000 years , 1990, Nature.

[23]  W. L. Orr.  Kerogen/asphaltene/sulfur relationships in sulfur-rich Monterey oils , 1986 .

[24]  Robert Blair Vocci.  Geology , 1882, Nature.