Abrupt changes in North American climate during early Holocene times
Article Abstract:
Studies of the Greenland ice cores have provided insights into the Holocene climatic dynamics. Analyses of varved sediments from Deep Lake in Minnesota, USA indicates a pronounced climate cooling from 8.9 to 8.3 kyr before present, possibly distinguished by increased outbreaks of polar air, falling precipitation temperatures and a higher proportion of the annual precipitation falling as snow. The abrupt onset could be due to a reorganization of atmospheric circulation and cooling of the Arctic airmass in summer. The timing and duration indicates its distinction from the cold snap occurring in Greenland and other regions 8,200 years ago.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
Is the ocean at the helm?
Article Abstract:
An analysis of patterns of wintertime sea surface temperature in the North Atlantic over a number of decades, along with records of the overlying atmospheric circulation, mapped through sea-level pressure distributions, indicates that the patterns develop in an extremely organized manner over decade timescales. The patterns were found to propagate in the direction of the main ocean currents. It has been shown that sea surface temperature anomalies and linked sea-level pressure anomalies are involved in a whole-ocean oscillation.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
Stirring times in the Southern Ocean
Article Abstract:
Researchers have undertaken a fertilization experiment in the Southern Ocean around Antarctica, and deduced scientific implications for interpreting past climate change.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Growth differentiation factor-9 is required during early ovarian folliculogenesis. Functional analysis of activins during mammalian development
- Abstracts: Ice cores and mammoth extinction. Contrasting atmospheric and climate dynamics of the last-glacial and Holocene periods
- Abstracts: A new target for aspirin. The importance of being selective
- Abstracts: Filial cannibalism in a paternal mouthbrooding fish in relation to mate availability. Effect of maternal and paternal line on spatial and temporal marine distribution in Atlantic salmon
- Abstracts: Dimercaptan-polyaniline composite electrodes for lithium batteries with high energy density. Making a potential difference: To reduce our use of fossil fuels we will need cheap and safe batteries to run electric vehicles and store energy - magnesium batteries may be the answer