Special Issues

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Water-soil-air-plant-human nexus: Modeling and observing complex land-surface systems at river basin scale

Last updated:
31 January 2018
Bidirectional coupling of complex human-nature system requires a deeper understanding of interactions between hyrologic systems and atmospheric, climatic, ecological, biophysical, biochemical and socioeconomic systems. This system of systems can be referred to as water-soil-air-plant-human nexus. In many river basins around the world, integrated studies of water-soil-air-plant-human nexus have been carried out. This special issue calls for contributions of observational analysis and modelling studies to advance the understanding of the water-soil-air-plant-human nexus in river basins around the world.

Dense water formations in the North Western Mediterranean: from the physical forcings to the biogeochemical consequences

Last updated:
16 October 2017
This is a joint special issue with JGR-Oceans and JGR-Atmospheres.

The North Western Mediterranean is a specific region playing a key role for the hydrology and biogeochemistry of the whole basin due to (1) the deep convection that redistribute organic and inorganic matters all over the water column, and (2) the subsequent intense spring bloom that represents the most important biological process of the basin at the origin of carbon exports. The MerMeX, HyMeX and MOOSE components of the MISTRALS program focus on the impact of winter convection on the water cycle, redistribution and stoichiometry of matter, development and succession of biological community over an annual cycle, and their potential evolutions. This special section compiles the major results of an unprecedented intensive and innovative effort of observation and modelling over a full annual cycle from June 2012 to September 2013. Ship-based operations, autonomous platforms (gliders, Bio-Argo floats, mooring lines), remote-sensing and coupled modelling were combined to better characterize and understand the NWM dense water formation phenomena, including the associated physical processes, and the biogeochemical response of the pelagic ecosystem.

3D Cloud Modeling as a Tool for 3D Radiative Transfer

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Last updated:
1 September 2017

The goal of this special issue is to summarize recent concerted efforts in 3D cloud modeling and 3D radiative transfer (RT). Much of the material to be published was presented at a special session at the 2017 JpGU-AGU Joint Assembly in Chiba, Japan. Fourier scaling and heterogeneity parameters in clouds are surveyed. The impact of a delta-four-stream RT scheme on cloud radiative effects is assessed. Two papers discuss ice cloud horizontal and/or vertical heterogeneity effects on passive retrievals at various resolutions. 3D cloud radiative effects are investigated using Monte Carlo and related to A-Train data, with linkage to cloud morphology. Another study focuses on unmixing clouds and aerosols in large-footprint hyper-angular spectro-polarimetric signals. These topics are at the cutting-edge of the field, and will serve as future reference.

Quantifying the emission, properties, and diverse impacts of wildfire smoke

Last updated:
24 August 2017
Credit: NASA

Wildfires are a global force of change that has a significant impact on terrestrial and atmospheric environments.  Under the control of weather, climate and human dynamics, fires are increasing in terms of burned area and the severity of fires, which adversely impacts air quality and feeds back to the climate system by altering patterns of precipitation, atmospheric and landscape albedo, and deposition on snow and ice. This special issue solicits manuscripts that address all aspects pertinent to quantifying the diverse impacts of smoke aerosols and gases originating from wildfires.

Topics of interest include, but are not limited to:

• Quantifying emissions from a wide variety of wildland fires (global, ecosystem-specific, crown, smoldering, agricultural, etc.)

• Linking land-use and land cover change to wildfire occurrence and its severity to include fire radiative power and energy

• The chemical, physical, and optical properties of emitted smoke particles as they age and evolve during smoke transport in the atmosphere

• In-situ measurements from ground-based and aircraft platforms

• Passive and active satellite sensors observations of smoke properties, vertical distribution, and horizontal transport

• Atmospheric transport modeling of smoke impacts using regional and global models

• Assessments of smoke impacts on the radiative regime of the atmosphere, including the impact on the surface radiative budget, radiative forcing at the top of the atmosphere and at the surface and the profile of radiative heating/cooling rates

• Impact of smoke particle deposition on snow/ice covered surfaces

• Impacts on photochemistry via modifying the photolysis rates and providing surfaces for heterogeneous reactions

• Impacts on air quality and adverse health implications

Atmosphere-ice-ocean-ecosystem processes in a thinner Arctic sea ice regime: the Norwegian young sea ICE cruise 2015 (N-ICE2015)

Results are presented from a 6-month interdisciplinary field experiment (Norwegian young sea ICE cruise; N-ICE2015) conducted in Arctic first-year sea ice north of Svalbard to understand atmosphere-ice-ocean interaction and the response of the physics, biogeochemistry and the marine ecosystem to the new thinner ice regime in the Arctic basin.

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.

Deep Convective Clouds and Chemistry 2012 Studies (DC3)

16 October 2014

Midlatitude Marine Heatwaves: Forcing and Impacts

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Last updated:
22 August 2017
*This is a Joint Special Collection* 
The following journals are accepting submissions: Geophysical Research Letters, JGR Oceans, JGR Biogeosciences, and JGR Atmospheres.

Persistent, midlatitude marine heatwaves (MHWs), such as the 2013-2014 extreme warming of the Northeastern Pacific (aka “the Blob”), can have dramatic and widespread impacts on ecosystems, fisheries and weather. MHWs have been observed in both hemispheres (e.g., the Ningaloo Niño in Western Australia), including in semi-enclosed basins such as the Mediterranean Sea. MHWs can be caused by a combination of atmospheric and oceanographic processes. It is also expected that they will become more frequent and intense under anthropogenic climate change. This Special Collection welcomes papers investigating the causes, evolution, and impacts of persistent midlatitude MHWs.