Variability of sea-ice conditions in the Fram Strait over the past 30,000 years Export

@article{citeulike:6016773, abstract = {Sea ice is a critical component of the climate system: variations in sea-ice cover affect the albedo of polar regions, and also the rate of deepwater formation1, 2. Changes in the sea-ice cover of the North Atlantic Ocean are thought to have been related to abrupt climate changes throughout the last glacial termination3, but reconstructions of sea-ice conditions are rare. Here we use the sedimentary abundance of the IP25 and brassicasterol biomarkers, produced by sea-ice-associated diatoms and open-water phytoplankton, respectively, to generate a record of sea-ice conditions in the northernmost Atlantic Ocean for the past 30,000 years. Our reconstruction shows that a stationary margin between sea-ice cover and the open ocean existed during the Last Glacial, although perennial sea-ice cover prevailed for most of the Last Glacial Maximum. An early warming about 14,000 years ago was associated with ice-free conditions; however, seasonal sea ice was present throughout the Holocene. We find temporal links between our record of sea ice and reconstructions of the amount of relatively warm Atlantic water advected into the Nordic Seas4, 5. We therefore conclude that changes in sea-ice conditions are linked to regional and global climate anomalies and oceanographic circulation in the North Atlantic.}, author = {Muller, Juliane and Masse, Guillaume and Stein, Rudiger and Belt, Simon T.}, citeulike-article-id = {6016773}, citeulike-linkout-0 = {http://dx.doi.org/10.1038/ngeo665}, citeulike-linkout-1 = {http://dx.doi.org/10.1038/ngeo665}, day = {25}, doi = {10.1038/ngeo665}, issn = {1752-0894}, journal = {Nature Geoscience}, keywords = {atlantic, climate, glacial, holocene, lgm, ocean, paleoclimate, plankton, proxy, sea-ice, variation}, month = {October}, number = {11}, pages = {772--776}, posted-at = {2009-10-27 20:29:38}, priority = {2}, publisher = {Nature Publishing Group}, title = {Variability of sea-ice conditions in the Fram Strait over the past 30,000 years}, url = {http://dx.doi.org/10.1038/ngeo665}, volume = {2}, year = {2009} }

TY - JOUR ID - citeulike:6016773 L3 - citeulike-article-id:6016773 N2 - Sea ice is a critical component of the climate system: variations in sea-ice cover affect the albedo of polar regions, and also the rate of deepwater formation1, 2. Changes in the sea-ice cover of the North Atlantic Ocean are thought to have been related to abrupt climate changes throughout the last glacial termination3, but reconstructions of sea-ice conditions are rare. Here we use the sedimentary abundance of the IP25 and brassicasterol biomarkers, produced by sea-ice-associated diatoms and open-water phytoplankton, respectively, to generate a record of sea-ice conditions in the northernmost Atlantic Ocean for the past 30,000 years. Our reconstruction shows that a stationary margin between sea-ice cover and the open ocean existed during the Last Glacial, although perennial sea-ice cover prevailed for most of the Last Glacial Maximum. An early warming about 14,000 years ago was associated with ice-free conditions; however, seasonal sea ice was present throughout the Holocene. We find temporal links between our record of sea ice and reconstructions of the amount of relatively warm Atlantic water advected into the Nordic Seas4, 5. We therefore conclude that changes in sea-ice conditions are linked to regional and global climate anomalies and oceanographic circulation in the North Atlantic. IS - 11 JF - Nature Geoscience SN - 1752-0894 EP - 776 TI - Variability of sea-ice conditions in the Fram Strait over the past 30,000 years PB - Nature Publishing Group VL - 2 SP - 772 KW - atlantic KW - climate KW - glacial KW - holocene KW - lgm KW - ocean KW - paleoclimate KW - plankton KW - proxy KW - sea-ice KW - variation AU - Muller, Juliane AU - Masse, Guillaume AU - Stein, Rudiger AU - Belt, Simon PY - 2009/10/25/ UR - http://dx.doi.org/10.1038/ngeo665 ER -