Iceberg Discharges into the North Atlantic on Millennial Time Scales During the Last Glaciation

  title={Iceberg Discharges into the North Atlantic on Millennial Time Scales During the Last Glaciation},
  author={Gerard C. Bond and Rusty Lotti},
  pages={1005 - 1010}
High-resolution studies of North Atlantic deep sea cores demonstrate that prominent increases in iceberg calving recurred at intervals of 2000 to 3000 years, much more frequently than the 7000-to 10,000-year pacing of massive ice discharges associated with Heinrich events. The calving cycles correlate with warm-cold oscillations, called Dansgaard-Oeschger events, in Greenland ice cores. Each cycle records synchronous discharges of ice from different sources, and the cycles are decoupled from… Expand
Millennial-scale instability of the antarctic ice sheet during the last glaciation
Carbon isotopes of benthic foraminifers reveal that South Atlantic IRD events coincided with strong increases in North Atlantic Deep Water production and inferred warming (interstadials) in the high-latitude North Atlantic. Expand
Icebergs in the North Atlantic: Modelling Circulation Changes and Glacio-Marine Deposition
Meltwater events (MWE) during and at the end of the last glaciation led to dramatic changes in the oceanic circulation of the North Atlantic combined with a strong reduction in deepwater formation orExpand
Ice‐rafted debris in the North Pacific and correlation to North Atlantic climatic events
A high-resolution record of the flux of ice-rafted debris in deep-sea cores from the Northeast Pacific indicates that the major interstadials that punctuated the last glaciation are concurrentExpand
Well-dated marine sediment cores that span the last 50 000 years frequently show considerable variability in both sediment and geochemical variables. In the North Atlantic, a series of ice- andExpand
A Pervasive Millennial-Scale Cycle in North Atlantic Holocene and Glacial Climates
Evidence from North Atlantic deep sea cores reveals that abrupt shifts punctuated what is conventionally thought to have been a relatively stable Holocene climate. During each of these episodes,Expand
Abrupt climate events 500,000 to 340,000 years ago: evidence from subpolar north atlantic sediments
Subpolar North Atlantic proxy records document millennial-scale climate variations that have an approximately constant pacing that is similar to that documented for the last glacial cycle, suggesting that such climate variations are inherent to the late Pleistocene, regardless of glacial state. Expand
Near-Synchronous Interhemispheric Termination of the Last Glacial Maximum in Mid-Latitudes
It is suggested that a global trend of rising summer temperatures at the end of the Last Glacial Maximum was obscured in North Atlantic regions by hypercold winters associated with unusually extensive winter sea ice. Expand
Warming of surface waters in the mid‐latitude North Atlantic during Heinrich events
[1] During the six Heinrich events of the last 70 kyr, episodic calving from the circum-Atlantic ice sheets released large numbers of icebergs into the North Atlantic. These icebergs and associatedExpand
Timing 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, to provide further evidence for the operation of a "bipolar see-saw" in air temperatures and an oceanic teleconnection between the hemispheres on millennial time scales. Expand
Regional seesaw between the North Atlantic and Nordic Seas during the last glacial abrupt climate events
Abstract. Dansgaard–Oeschger oscillations constitute one of the most enigmatic features of the last glacial cycle. Their cold atmospheric phases have been commonly associated with cold sea-surfaceExpand


Evidence for massive discharges of icebergs into the North Atlantic ocean during the last glacial period
SEDIMENTS in the North Atlantic ocean contain a series of layers that are rich in ice-rafted debris and unusually poor in foraminifera1. Here we present evidence that the most recent six of theseExpand
Changes in Atmospheric Circulation and Ocean Ice Cover over the North Atlantic During the Last 41,000 Years
High-resolution, continuous multivariate chemical records from a central Greenland ice core provide a sensitive measure of climate change and chemical composition of the atmosphere over the lastExpand
Ice-rafted evidence of long-term North Atlantic circulation
Abstract The absolute and relative rates of deposition of ice-rafted volcanic and terrigenous clastic material were determined for the interval from the base of oxygen isotope stage 5 (∼ 127,000 yrsExpand
Role of the thermohaline circulation in the abrupt warming after Heinrich events
EVIDENCE of rapid climate oscillations during the last glacial period has been identified in climate records from Greenland ice cores1,2 and ocean sediments in the North Atlantic3,4. These recordsExpand
Origin and consequences of cyclic ice rafting in the Northeast Atlantic Ocean during the past 130,000 years
Deep-sea sediment cores recovered from the Northeast Atlantic Ocean were examined in order to elucidate the influence of the Earth's orbital parameters on major ice rafting. Analyses ofExpand
Patterns of Ice-Rafted Detritus in the Glacial North Atlantic (40–55°N)
The observation by Heinrich (1988) that, during the last glacial period, much of the input of ice-rafted detritus to the North Atlantic sediments may have occurred as a succession of catastrophicExpand
Deep circulation change linked to HEINRICH Event 1 and Younger Dryas in a middepth North Atlantic Core
A core from the Mid-Atlantic Ridge at 43.5°N and ∼3 km water depth shows distinct evidence of the deglacial events known as Heinrich event 1 (probably the marine equivalent of Oldest Dryas cooling inExpand
Vertical Mixing of Ice-Rafted Volcanic Ash in North Atlantic Sediments
Three times in the last 620,000 yrs, highly silicic ash ejected from Icelandic or Jan Mayer volcanoes has been deposited in sediments over an area of several million square kilometers in the NorthExpand
Late Quaternary deposition of ice-rafted sand in the subpolar North Atlantic (lat 40° to 65°N)
A major change in the North Atlantic pattern of ice-rafting deposition, during the last interglacial-glacial cycle, occurred approximately 75,000 B.P. Prior to this time, deposition for a period ofExpand
Massive iceberg discharges as triggers for global climate change
Observations of large and abrupt climate changes recorded in Greenland ice cores have spurred a search for clues to their cause. This search has revealed that at six times during the last glaciation,Expand