Current covers of AGU Journals. For older covers, see the archives of each journal. High resolution images are available in the issue information PDF of each issue.
Temporal height distribution of the temperature deviation from 19 to 25 January 2008.
Image from instruments on SDO, STEREO, and SOHO of the CME that launched from the Sun on 14 October 2014. The CME was observed fromthe Sun all the way to New Horizons at 32 AU, en route to Pluto.
Image shows ROV images of the hornitos at the summit of the Tagoro volcano: (a) Location on the images on the multibeam bathymetry from the 28 June 2012. (b) Deepest hornito formed by 4–5 m tall pyramid-like of agglutinated lava blocks intermixed with yellow hydrothermal deposits (115 m water depth). (c) Detail of degassing vents (yellow orifices) along the flanks of the chimney interpreted as active hydrothermal vents (118 m water depth). (d) Top of the shallowest “hornito” (89 m water depth) showing abundance of red flocculates covering the lava deposits. (e) Detail of the flank of a hornito showing white bacterial mats. (f ) Detail the tapestry of red to orange amorphous Fe-oxyhydroxide flocculates covering the overall summit of the Tagoro volcanic edifice.
In Kufner et al. [DOI: 10.1002/2016GC006640], image shows an example of one of the 39 Siderastrea siderea colonies included in this study (a) attached
In Ehard et al. [DOI: 10.1002/2016JD025621], horizontal wind speed (m s−1, color coded) along 170°E on 31 July 2014 at 1200 UTC. The black dashed vertical line denotes the position of Lauder, New Zealand.
The figure illustrates river water and groundwater interactions at the reach scale (left) and the hyporheic scale (right). These interactions are at the core of a wide
range of major contemporary challenges, including the provision of high-quality drinking water in sufficient quantities, the loss of biodiversity in river ecosystems, or
the management of environmental flow regimes. Brunner et al. [10.1002/2017RG000556] review state of the art approaches in characterizing and modeling river and
groundwater interactions, including remote sensing to characterize the streambed, emerging methods to measure exchange fluxes between rivers and groundwater, and
developments in several disciplines relevant to the river-groundwater interface. These novel approaches show great potential to tackle the most critical water resources
challenges at the watershed scale.
The orientation circles in the orbital coordinate system calculated for 132 amplitudes A measured during the 3 day period (26–29 October 2015). The intersection of the circles indicates the satellite spin axis orientation (az
imuth = 18.7°, elevation = −7.8°);
the position of the orbital perigee is at azimuth = 0°, elevation = 0°.
Giordani et al. [DOI: 10.1002/2016JC012019], intense surface buoyancy losses (–400 W/m2, colour) occurred under the path of Mistral and Tramontane winds (black arrows, N/m2) in the Gulf of Lion (GL) during the ASICS-MED experiment (February 2013). These buoyancy fluxes and positive Ekman pumping (cyan positive, green negative wind-stress curl used as proxy of the Ekman pumping, N/m3 x 10 5; interval 0.2 x 10–5 N/m3 x 1.105) are key atmospheric conditions for dense water formation (DWF) and preconditioning in the GL. DWF also occurs along the Catalan coast i.e. along the northern branch of the Liguro-Provençal Current where strong horizontal density gradients are present (see brown lines of surface density). DWF results from the coupling between the surface wind stress (black arrows) and lateral buoyancy gradients because this coupling leads to efficient destratification and PV-destruction in frontal regions. As consequence DWF cannot be reduced as a buoyancy flux problem.
Observational properties of a newly discovered auroral form near local noon, called throat aurora, revealing combined contributions from inside and outside of the magnetosphere on the generation. The image gives a schematic summarizing the physical process leading to the formation of throat aurora.
Schematic showing how tabular icebergs are constructed using Lagrangian elements. (a) Hierarchy of ice elements’ physical structure: (i) Previous iceberg models represent icebergs using non-interacting point-particle elements; (ii) In the new framework ice elements are given finite extent so that they are able to interact with the ocean across multiple grid cells, and can interact with other elements; (iii) These finite extent elements can be joined together by numerical bonds (magenta lines) to form larger structures such as tabular icebergs. (b) Areal photograph of a tabular iceberg with elements superimposed over it to illustrate how the Lagrangian elements can be used to model tabular icebergs. In this schematic, the ice elements (purple dots) are initialized in a staggered lattice covering the surface area of the iceberg. For purposes of mass aggregation, the ice elements are assumed to have hexagonal shape (red hexagons). For purposes of element interactions, the ice elements are assumed to be circular (black circles). Elements are initially bonded to adjacent elements using numerical bonds (magenta lines). These numerical bonds form equilateral triangles which give the shape rigidity. An ocean grid has been included (dashed cyan lines). The background photo is an areal photograph of iceberg PIIB (Area5 42 km2) taken in Baffin Bay in 2012. A red ship can be identified on the bottom of the photo for scale.
Rokhzad et al studied optimization of dissipation and dispersion errors for two-frequency system of equations using IMEX Runge-Kutta schemes. They found A-stability property to be more useful than L-stability property, more specifically for stiff limits, since A-stability allows to increase the range of stability (first row) and decrease the phase errors (second and third rows), which are related to larger stable time step size and more accurate solutions respectively.
Image shows (a)–(f ) Snapshots of the spatial distributions of viscosity (background colors) and velocities (vectors) for the different stages of the seismic cycle from 1 h (a) to century (f ) of the typical earthquake (Mw 9.3)generated by the high-
resolution version of the reference nonlinear transient model. Note different scales of the velocity vectors. The red triangle at the surface indicates the position of the virtual GPS station located about 300 km landward from the trench.
In Rutte et al., image shows (a–d) Panoramic views of the Muskol dome. Distortion increases toward the image edges. Figures 4a and 4b are along section A in Figure 8. Thrusts and north vergent, recumbent, isoclinal folds in Figure 4d are in left part of Figure 4c. (e–h) Fault scarps in colluvial and alluvial deposits and range front normal faults along the active Sarez-Karakul graben system.
In Yanase et al., image shows time-longitude cross sections of the composite surface rain rate from TRMM 2A25 for (a) December, January, and February; (b) March, April, and May; (c) June, July, and August; and (d) September, October, and November
Sea level pressure anomalies with respect to the 5 years preceding each eruption (hPa) for the
In Deng et al., satellite image of Hainan Island and the northern SCS. Yellow stars indicate sampling locations.
Radermach et al. [DOI: 10.1002/2016JC011942] observed tidal ow separation o the Sand Motor, a mega-scale beach nourishment at the Dutch
Two eddy-covariance flux towers at the Harvard Forest in New England where the hemlock woolly adelgid (Adelges tsugae) infestation has resulted in eastern hemlock (Tsuga canadensis) mortality (photo by David A. Orwig).
The estimated linkages of stream water quality with the land use and hydrologic drivers identify the management targets and priorities to achieve healthy coastal-urban stream ecosystems.