North Pacific seasonality and the glaciation of North America 2.7 million years ago

  title={North Pacific seasonality and the glaciation of North America 2.7 million years ago},
  author={Gerald H. Haug and Andrey Ganopolski and Daniel M. Sigman and Antoni Rosell‐Mel{\'e} and George E. A. Swann and Ralf Tiedemann and Samuel Laurent Jaccard and J{\"o}rg Bollmann and Mark A. Maslin and Melanie J. J Leng and Geoffrey Eglinton},
In the context of gradual Cenozoic cooling, the timing of the onset of significant Northern Hemisphere glaciation 2.7 million years ago is consistent with Milankovitch's orbital theory, which posited that ice sheets grow when polar summertime insolation and temperature are low. However, the role of moisture supply in the initiation of large Northern Hemisphere ice sheets has remained unclear. The subarctic Pacific Ocean represents a significant source of water vapour to boreal North America… 

Climate change: Snow maker for the ice ages

  • K. Billups
  • Environmental Science, Geography
  • 2005
New palaeoceanographic data and results of a climate model indicate that changes in the subarctic North Pacific may have driven the onset of glaciation in the Northern Hemisphere during the Late Cenozoic ice age.

Time‐transgressive North Atlantic productivity changes upon Northern Hemisphere glaciation

[1] Marine biological export productivity declined in high-latitude regions in the North Pacific and Southern Ocean 2.7 million years ago, in parallel with the intensification of Northern Hemisphere

Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations

The intensification of Northern Hemisphere glaciations at the end of the Pliocene epoch marks one of the most substantial climatic shifts of the Cenozoic. Despite global cooling, sea surface

Antarctic and Southern Ocean influences on Late Pliocene global cooling

Evidence for a major expansion of an ice sheet in the Ross Sea that began at ∼3.3 Ma, followed by a coastal sea surface temperature cooling of ∼2.5 °C, indicates an additional role played by southern high-latitude cooling during development of the bipolar world.

Late Pliocene Marine pCO2 Reconstructions From the Subarctic Pacific Ocean

The development of large ice sheets across the Northern Hemisphere during the late Pliocene and the emergence of the glacial‐interglacial cycles that punctuate the Quaternary mark a significant

Younger Dryas deglaciation of Scotland driven by warming summers

A deglacial chronology from Scotland is presented, immediately downwind of the North Atlantic Ocean, indicating that the Scottish ice cap disintegrated during the first half of the Younger Dryas, suggesting summertime warming during the Younger dryas, potentially as a function of enhanced seasonality in the NorthAtlantic.

Pliocene‐Pleistocene evolution of sea surface and intermediate water temperatures from the southwest Pacific

The reconstructed Pliocene‐Pleistocene history of both sea surface and Antarctic Intermediate Water (AAIW) temperatures on orbital time scales is reconstructed from Deep Sea Drilling Project Site 593 in the Tasman Sea, southwest Pacific and suggests an equatorward displacement of the subtropical front relative to present and a poleward displacements of the subantarctic front of the Antarctic Circumpolar Current.



Effect of the formation of the Isthmus of Panama on Atlantic Ocean thermohaline circulation

The Late Cenozoic closure of the seaway between the North andSouth American continents is thought to have caused extensive changes in ocean circulation and Northern Hemisphere climate. But the timing

Regional climate shifts caused by gradual global cooling in the Pliocene epoch

Climate records from high latitudes, subtropical regions and the tropics are compared, indicating that the onset of large glacial/interglacial cycles did not coincide with a specific climate reorganization event at lower latitudes and suggesting that mean low-latitude climate conditions can significantly influence global climate feedbacks.

Closing of the Indonesian seaway as a precursor to east African aridification around 3–4 million years ago

It is suggested that the northward displacement of New Guinea, about 5 Myr ago, may have switched the source of flow through Indonesia—from warm South Pacific to relatively cold North Pacific waters, stimulating global cooling and the eventual growth of ice sheets.

Onset of permanent stratification in the subarctic Pacific Ocean

The surface waters of the modern subarctic Pacific Ocean are isolated from the nutrient-rich waters below by a steep vertical gradient in salinity (halocline), a feature which is a dominant control

Polar ocean stratification in a cold climate

Deep-sea records of biogenic opal accumulation and sedimentary nitrogen isotopic composition from the Subarctic North Pacific Ocean and the Southern Ocean indicate that vertical stratification increased in both northern and southern high latitudes 2.7 million years ago, when Northern Hemisphere glaciation intensified in association with global cooling during the late Pliocene epoch.


For well over a century, scientists have speculated that variations in the atmospheric concentration of radiatively important trace gases, such as carbon dioxide, could control the Earth’s climate

Isotopic Paleoceanography of the Caribbean and East Pacific: Role of Panama Uplift in Late Neogene Time

  • L. Keigwin
  • Environmental Science, Geography
  • 1982
Comparisons of carbon isotopic data on benthic foraminifera from Deep Sea Drilling Project sites 502 and 503 suggest that modern circulation patterns in the Caribbean and eastern Pacific developed by 3 million years ago in concert with changing tectonic, climatic, and biogeographic patterns.

Oxygen isotope calibration of the onset of ice-rafting and history of glaciation in the North Atlantic region

We report here that DSDP Site 552A, cored with the hydraulic piston corer on the west flank of Rockall Bank, recovered an undisturbed sequence of alternating white deep-sea carbonate oozes and

Transient simulation of the last glacial inception. Part I: glacial inception as a bifurcation in the climate system

We study the mechanisms of glacial inception by using the Earth system model of intermediate complexity, CLIMBER-2, which encompasses dynamic modules of the atmosphere, ocean, biosphere and ice

Geologic evidence for a mantle superplume event at 1.9 Ga

Both preserved and restored areal distributions of Proterozoic marine intracratonic, passive margin, and platform sediments show a prominent peak at ∼1.9 Ga, indicating that shallow marine sediments