Document Detail


Possible methane-induced polar warming in the early Eocene.
MedLine Citation:
PMID:  11536496     Owner:  NASA     Status:  MEDLINE    
Abstract/OtherAbstract:
Reconstructions of early Eocene climate depict a world in which the polar environments support mammals and reptiles, deciduous forests, warm oceans and rare frost conditions. At the same time, tropical sea surface temperatures are interpreted to have been the same as or slightly cooler than present values. The question of how to warm polar regions of Earth without noticeably warming the tropics remains unresolved; increased amounts of greenhouse gases would be expected to warm all latitudes equally. Oceanic heat transport has been postulated as a mechanism for heating high latitudes, but it is difficult to explain the dynamics that would achieve this. Here we consider estimates of Eocene wetland areas and suggest that the flux of methane, an important greenhouse gas, may have been substantially greater during the Eocene than at present. Elevated methane concentrations would have enhanced early Eocene global warming, and also might specifically have prevented severe winter cooling of polar regions because of the potential of atmospheric methane to promote the formation of optically thick, polar stratospheric ice clouds.
Authors:
L C Sloan; J C Walker; T C Moore; D K Rea; J C Zachos
Related Documents :
19411546 - Desert ants do not rely on sky compass information for the perception of inclined path ...
14603476 - Detection of intracellular macromolecule behavior under strong magnetic fields by linea...
8410706 - Polarity reversal of the optical rotation signals with change in direction of impulse c...
22274226 - Photon correlation spectroscopy with incoherent light.
16371996 - Circadian organization in reindeer.
12435546 - Differential joint coordination in the tasks of standing up and sitting down.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  357     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  1992 May 
Date Detail:
Created Date:  1995-08-08     Completed Date:  1995-08-08     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  320-2     Citation Subset:  S    
Affiliation:
Department of Geological Sciences, University of Michigan, Ann Arbor 48109-1063.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Atmosphere
Climate
Cold Climate*
Earth (Planet)
Evolution*
Geological Phenomena
Geology
Greenhouse Effect*
Methane*
Oceans and Seas
Paleontology
Temperature
Chemical
Reg. No./Substance:
74-82-8/Methane
Investigator
Investigator/Affiliation:
J C Walker / U Michigan, Ann Arbor, Dept Geological Sciences

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Research under reduced gravity. Part II: experiments in variable gravitational fields
Next Document:  Wind-induced plant motion immediately increases cytosolic calcium.