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Climatic and Biotic Events of the Paleogene: Earth Systems and Planetary Boundaries in a Greenhouse World

Last updated:
14 November 2017
The Paleogene Period was a time of extremes and transitions. Bounded by the catastrophic extinction of the dinosaurs and the rise of modern grasslands, the world of the Paleogene was characterized by climatic conditions largely unfamiliar to us today but saw the rise of essentially modern continental configurations, biotic communities, and biogeochemical regimes. Understanding the function of these systems under global greenhouse conditions that may approximate Earth's climatic future is intriguing both for what it can tell us about our past and for the hints it may provide about our future.



This special collection will highlight current findings, questions, and challenges related to understanding Earth system function during the Paleogene and bounding geologic intervals, including research featured during the 2017 Climatic and Biotic Events of the Paleogene conference. Papers investigating climatic, biotic, and physical systems, and their interaction over a wide range of timescales, are welcomed.

The Arctic: An AGU Joint Special Collection

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Last updated:
24 August 2017
The Arctic has become the focus of many new investigations and studies across a number of disciplines. In many cases, this research is integrating diverse new data sets, observations, and modeling, and making connections among and across the biosphere, oceans, atmospheres, space, and geophysical environments. These papers include historical and new research on the Arctic and represent the following AGU journals: Earth’s Future, Earth and Space Science, Geochemistry Geophysics Geosystems (G-Cubed), Geophysical Research Letters, Global Biogeochemical Cycles, JAMES (Journal of Advances in Modeling Earth Systems), JGR: Oceans, JGR: Atmospheres, JGR: Solid Earth, JGR: Space Physics, JGR: Biogeosciences, JGR: Earth’s Surface, Reviews of Geophysics, Space Weather, and Water Resources Research.

WAIS Divide Ice Core Project, high time resolution records of the last 68ka

Last updated:
16 September 2016
The WAIS Divide ice core project has developed high time resolution paleoclimate records extending to 68ka from an Antarctic ice core.   A wide range of paleoenvironmental parameters where measured including atmospheric gases, aerosols, ice physical properties, and water isotopes. Annual layers have been continuously identified to an age of 31.2 ka, and the gas age-ice age difference varies from 205 to 525 years.   These records have unprecedented time resolution for an Antarctic ice core covering the last 68ka. The project focused on understanding the relationship between greenhouse gases and global climate, determining the precise timing of environmental changes in Antarctica and other regions,  the magnitude of a variety of southern hemisphere environmental changes, and cryobiology.  This effort has resolved many long standing questions. This special issue of Paleoceanography collects all the AGU publications associated with the WAIS Divide project into a single volume.

Paleoproductivity and Paleochemistry of the Oceans

Published:
1 October 1990
New developments in ocean paleoproductivity and paleochemistry have involved the application of tracers that record seawater composition, that document sedimentary fluxes, and that may be used to infer oceanic processes.

Paleo-Ocean Modeling

Published:
1 June 1990
The purpose of the special issue is to call attention to this new development and hopefully stimulate further work on the subject. Included in the issue are ocean general circulation model(GCM) studies, atmospheric GCM studies that have implications for ocean circulation, regional-scale models,and more idealized models that have proved useful in climate studies for testing mechanisms and probing a wide range of parameter space.

Polar Seas Geological Record

Published:
1 October 1988
The session documented that polar research is presently progressing rapidly because scientists from many nations are using new technology to collect data in Arctic and Antarctic waters and to define differences between the polar environments and their biota and the environments and biota of lower latitudes.

Sediment Waves and Sediment Drifts: Monitors of Global Changes in Deepwater Circulation

Published:
1 December 1994
The purpose of this special section in Paleoceanography is to present interdisciplinary approaches for contributing to the reconstruction of ocean circulation and its response to climate changes. A high-priority objective for understanding the causes and mechanisms of climate change is the monitoring of past ocean circulation and oceanic heat and nutrient transport.

Cenzoic Paleoceanography

Published:
1 December 1987
New developments in Cenozoic paleoceanography include the application of climate models and atmospheric general circulation models to questions of climate reconstruction, the refinement of conceptual models for interpretation of the carbon isotope record in terms of carbon mass balance, paleocirculation, paleoproductivity, and the regional mapping of paleoceanographic events by acoustic stratigraphy.

Quaternary Deep-Water Circulation

Published:
1 June 1988
The degree of similarity of the ˆÂ‚13C records of the planktonic foraminiferal species N. pachyderma and of the benthic foraminiferal genus Cibicides in the high-latitude basins of the world ocean is used as an indicator of the presence of deepwater sources during the last climatic cycle.