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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.

Stochastic Transport and Emergent Scaling on Earth's Surface

Published:
1 June 2010
This special section is intended to present new ideas and theories for the transport of environmental fluxes (water, sediment, pollutants, and biota) on the Earth's surface, including transport on hillslopes, rivers, and river networks. Given that the “substrate” over which this transport takes place is highly heterogeneous (from the highly varying velocities carrying sediment and other fluxes down a stream to the highly heterogeneous hillslope morphology producing the sediment to the hierarchical structure of river networks), emphasis is placed on properly accounting for this heterogeneity in the transport laws.

Aeolian Processes: Field Observations and Modeling

Published:
1 June 2008
Aeolian processes, involving erosion, transportation, and deposition of sediment by the wind, occur in a variety of environments including coastal areas, semiarid, and arid regions (e.g., cold and hot deserts), agricultural fields, and some planetary bodies, notably Mars and possibly Venus and Titan. Aeolian processes are responsible for the emission, transport, and deposition of dust and formation of areas of sand dunes.

Permafrost and Seasonally Frozen Ground Under a Changing Climate

Published:
1 June 2008
Frozen ground has become a hot topic. Only two decades ago, the subject was a relatively isolated field, largely without coordinated international monitoring programs, measurement protocols, or comprehensive data compilations [see Barry, 1988]. Concerns about global warming and rapid internationalization have changed the face of permafrost science over the intervening years

The Papuan Continuum: Source to Sink Through the Fly River System and Gulf of Papua

Published:
1 March 2008
The Papuan Continuum: Source to Sink Through the Fly River System and Gulf of Papua

Beyond Steady State: The Dynamics of Transient Landscapes

Published:
1 September 2007
Beyond Steady State: The Dynamics of Transient Landscapes

Marine Sandwave and River Dune Dynamics

Published:
1 March 2006
Rhythmic patterns are common features in nature. Prominent examples are the patterns formed on the interface of a mobile sandy bed and turbulent flow, due to currents, tides, wind waves or other forcing mechanisms. These bed patterns or bed forms vary in both spatial and temporal scales, from small-scale bed ripples (spacing on the order of centimeters) to large-scale tidal sand banks (spacing on the order of 5 km). In this paper and in this special issue, we focus on a cluster of large-scale features, i.e., marine sand waves and river dunes, occurring in rivers, estuaries and seas all over the world.