منابع مشابه
Mechanisms of Abrupt Climate Change of the Last Glacial Period
[1] More than a decade ago, ice core records from Greenland revealed that the last glacial period was characterized by abrupt climate changes that recurred on millennial time scales. Since their discovery, there has been a large effort to determine whether these climate events were a global phenomenon or were just confined to the North Atlantic region and also to reveal the mechanisms that were...
متن کاملTiming of millennial-scale climate change in Antarctica and Greenland during the last glacial period.
A precise relative chronology for Greenland and West Antarctic paleotemperature is extended to 90,000 years ago, based on correlation of atmospheric methane records from the Greenland Ice Sheet Project 2 and Byrd ice cores. Over this period, the onset of seven major millennial-scale warmings in Antarctica preceded the onset of Greenland warmings by 1500 to 3000 years. In general, Antarctic temp...
متن کاملEvidence for cryptic northern refugia in the last glacial period in Cryptomeria japonica.
BACKGROUND AND AIMS Distribution shifts and natural selection during past climatic changes are important factors in determining the genetic structure of forest species. In particular, climatic fluctuations during the Quaternary appear to have caused changes in the distribution ranges of plants, and thus strongly affected their genetic structure. This study was undertaken to identify the respons...
متن کاملPersistence of Gulf Stream separation during the Last Glacial Period: Implications for current separation theories
[1] We present stable oxygen isotope ratio (dO) measurements on deep-dwelling planktonic foraminifera from thewesternmargin of the North Atlantic in order to reconstruct the latitude at which the Gulf Stream separated from the western boundary of the Atlantic Ocean in the past. The modern separation latitude can be reconstructed within one degree from dO measured on the fossil shells of deep-dw...
متن کاملLink between the North and South Atlantic during the Heinrich events of the last glacial period
High resolution benthic oxygen isotope records combined with radiocarbon datings, from cores retrieved in the North, Equatorial, and South Atlantic are used to establish a reliable chronostratigraphy for the last 60 ky. This common temporal framework enables us to study the timing of the sub-Milankovitch climate variability in the entire surface Atlantic during this period, as re#ected in plank...
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ژورنال
عنوان ژورنال: Nature
سال: 1874
ISSN: 0028-0836,1476-4687
DOI: 10.1038/010062c0