Patterns of Ice-Rafted Detritus in the Glacial North Atlantic (40-55°N)
نویسندگان
چکیده
منابع مشابه
Ice-Rafted Detritus Events in the Arctic During the Last Glacial Interval, and the Timing of the Innuitian and Laurentide Ice Sheet Calving Events
Ice-rafted detritus (IRD) layers in the Arctic Ocean not only indicate the source of this detrital sediment, but give insights into the ice drift and ice sheet history. Detrital sand-sized Fe oxide mineral grains that are matched to precise sources using the microprobe chemical fingerprint of each grain, along with elevated coarse IRD abundance and radiocarbon ages, are used to define IRD peaks...
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Raised beach ridges on Livingston Island of the South Shetland Islands display variations in both quantity and source of ice rafted detritus (IRD) received over time. Whereas the modern beach exhibits little IRD, all of which is of local origin, the next highest beach (~250 14C yr BP) has large amounts, some of which comes from as far away as the Antarctic Peninsula. Significant quantities of I...
متن کاملCharacteristics and climate impacts of sea ice in the glacial North Atlantic
North Atlantic sea ice displacements are thought to play an important role in the abrupt Dansgaard-Oeschger (D-O) cycles of the last glacial period. This model study investigates sea ice variability in glacial climates to help provide constraints on its involvement in D-O cycles. Sea ice variability in a coupled climate model simulation of the Last Glacial Maximum (21 ka) is concentrated in the...
متن کاملObliquity-driven expansion of North Atlantic sea ice during the last glacial
North Atlantic late Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial duration oscillations known as Dansgaard-Oeschger (D-O) events. However, during the Last Glacial Maximum (LGM) 23,000 to 19,000 cal years ago (23 to 19 ka), no D-O events are observed in the Greenland ice cores. Our new analysis of the Greenland δO record reveals a switch in t...
متن کاملIceberg discharges of the last glacial period driven by oceanic circulation changes.
Proxy data reveal the existence of episodes of increased deposition of ice-rafted detritus in the North Atlantic Ocean during the last glacial period interpreted as massive iceberg discharges from the Laurentide Ice Sheet. Although these have long been attributed to self-sustained ice sheet oscillations, growing evidence of the crucial role that the ocean plays both for past and future behavior...
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ژورنال
عنوان ژورنال: Paleoceanography
سال: 1993
ISSN: 0883-8305
DOI: 10.1029/92pa02923