Evidence for historic global warming published ...( rrosive waters killed many of the deep...)

rrosive waters killed many of the deep-sea species," according to the article. "On land, higher partial pressure of carbon dioxide and elevated temperatures quickly opened high-latitude migration routes for the widespread dispersal of mammals. Over several hundred thousand years, global carbon and oxygen cycles gradually returned to equilibrium conditions after the LPTM, although marine and terrestrial ecosystems were forever changed."

Pak explained that the sediment core, removed as part of the Ocean Drilling Prog ram, was taken from an area known as the Blake Nose, a promontory on the continental shelf off the coast of Florida. She said that the core shows disturbed sediment, evidence of a submarine landslide layer that fits with the theory of the melting of buried methane--methane clathrates--from an ice-like solid into a gas.

The article concludes with a call for further research, "Even though our results suggest that methane was released from the Blake Nose region, during the LPTM, the mass of methane from this region alone is insufficient to explain the magnitude of global perturbations at the LPTM. Other sections deposited on the middle to lower slope during the LPTM also must exhibit features similar to those reported here."

Besides Pak, co-authors on the paper are: Miriam E. Katz and Kenneth G. Miller from Rutgers University, Piscataway, New Jersey, and Gerald R. Dickens from James Cook University, Townsville, Queensland, Australia.

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Contact: Gail Brown
gbrown@instadv.ucsb.edu
805-893-7220
University of California - Santa Barbara
17-Nov-1999

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