Journal
SCIENCE
Volume 348, Issue 6238, Pages 1016-1019Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1262005
Keywords
-
Categories
Funding
- NSF [1043518, 1142041, 0944552, 0839093, 1142166, 0230396, 0440817, 0944348, 0944266]
- Ice Drilling Program Office
- Ice Drilling Design and Operations group
- National Ice Core Laboratory
- Raytheon Polar Services
- 109th New York Air National Guard
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1043518, 0944348, 1142041, 1043522] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [0944552, 1142166] Funding Source: National Science Foundation
Ask authors/readers for more resources
The causal mechanisms responsible for the abrupt climate changes of the Last Glacial Period remain unclear. One major difficulty is dating ice-rafted debris deposits associated with Heinrich events: Extensive iceberg influxes into the North Atlantic Ocean linked to global impacts on climate and biogeochemistry. In a new ice core record of atmospheric methane with ultrahigh temporal resolution, we find abrupt methane increases within Heinrich stadials 1, 2, 4, and 5 that, uniquely, have no counterparts in Greenland temperature proxies. Using a heuristic model of tropical rainfall distribution, we propose that Hudson Strait Heinrich events caused rainfall intensification over Southern Hemisphere land areas, thereby producing excess methane in tropical wetlands. Our findings suggest that the climatic impacts of Heinrich events persisted for 740 to 1520 years.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available