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.
In Aiuppa et al., image sequence showing evolution of Villarrica volcano throughout December 2014 to March 2015.
Temperature perturbations at ~40 km, ~50 km, and ~60 km at 11:00LT 4 October 2013 in the data of Modern Era Retrospective Analysis for Research and Applications (MERRA), revealing atmospheric gravity wave oscillations that most likely initiated equatorial plasma bubbles in the
ionosphere. The red dotted lines represent the magnetic equator.
Photograph of wheat prairie under clouds. See Smith et al. [DOI:10.1002/2016GH000018] to learn more about how increasing carbon dioxide levels over the coming century may reduce the iron content of many crops and impact global malnutrition
Three‐dimensional block model of the subduction interface and seismicity based on the results obtained in this study. The subducting oceanic crust of the Ionian plate is dark blue, while the subducting continental crust of the Adriatic plate is in brown. Variable shading on the interfaces represents relief, with oblique illumination from a light source to the right of the model. The magenta solid lines mark large strike‐slip faults, including the Kephalonia Transform Fault and the western tip of the North Anatolian Fault. The magenta dashed line marks the putative boundary between oceanic and continental slabs based on the contrast in seismicity (though apparent changes in the slab‘s tomographic response could also be used to constrain this boundary, we refrain from doing so as there is a progressive change in resolution associated with the contrast in seismicity between north and south; see Figure 2). Relocated hypocenters are indicated by red spheres, with size corresponding to magnitude. The green spheres are hypocenters projected onto the slab top surface.
The cover figure shows examples of local and regional seismic events observed using surface fiber-optic cables and distributed acoustic sensing (DAS).
Left: installation photographs from three sites with fiber optic cables including Richmond, CA (top), Fairbanks, AK (middle), and Stanford, CA (bottom). Right: a small catalog of seismic events observed using these surface DAS cables from 5 to 500
km epicentral distance. Events are color-coded to the site of observations.
The Ex-Alta 1 Cube-Satellite, to be launched in late 2016 as part of the ESA QB50 constellation mission, will demonstrate the potential
Pryor et al. [DOI: 10.1002/2016JD025854] computed fluxes of ultra-fine particles (UFP) above and below the canopy of a mature deciduous
Image shows (a) Raw elevation difference between preevent (15 June 2016) and postevent (16 July 2016) digital elevation models (DEMs) over the Lamplugh rock avalanche deposit. Dashed line indicates the extent of the source area, which is obscured by clouds in the image acquired on 16 July 2016. (b) Raw elevation difference between prevent (15 June 2016 and 14 August 2012) and postevent (27 September 2016) DEMs in the source area of the Lamplugh rock avalanche
Intersection wave signal stacks for (a) constant load on the vertical fracture plane and increasing
load on the horizontal fracture plane for the long aluminum bars and (c) two steering loading cases (purple and orange) in the
aluminum samples. Bulk shear, Rayleigh, and wedge waves are shown for comparison. (b) Predicted velocities of the intersection
wave in C2v
symmetry (unequal stiffness), at 1 MHz, for an orthogonal fracture intersection with varying stiffnesses for mode A1. The analo
gous mode in the
C4v symmetry is shown as the black line along the diagonal.
In Czuba et al. image shows Lidar hillshade highlighting major features (river, bluff, and ravine, each with relevant attributes) incorporated into the model. Inset image shows a 64m bluff; note the canoe for scale. Location and extent is shown in Figure3by a small red box.
Merged Polar/VIS Earth Camera image (orange-scale global image of Earth) with DMSP/OLS data (black and white high-resolution image), showing evening-sector brightening coincident with the strong convection regionof a subauroral polarization stream.
In Schwarz et al. [DOI: 10.1002/2016EA000234], image shows error correlation matrices from CP and MC methods: (a) Covariance propagated R and (b) Monte Carlo propagated R MC αs for statistically optimized bending angle, (c) propagated R r and (d) Monte Carlo R MC Nr for retrieved refractivity, (e) propagated R pdr and (f) Monte Carlo R MC pdr for retrieved dry pressure, and (g) propagated R Tdr and (h) Monte Carlo R MC Tdr for retrieved dry temperature.
In DeVries and Weber, DeVries and Weber combined satellite and oceanographic tracer data to estimate the flux of sinking organic carbon out of the ocean‘s euphotic zone, and the efficiency with which the carbon is transferred to the deeper ocean.
Venus, Mars, Titan, Pluto, and a comet are shown at the same scale to illustrate the relative sizes of the
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.
In Schnur et al., eruptive vents observed in 2010. (a) Map showing linear arrangement of vents. (b) Phantom vent. (c) Sulfur vent. (d) Brimstone vent. (e) Styx vent. (f) Charon vent.
Fire-scarred Dahurian larch from the Daxing’an Mountains in northeast China.
In Siebach et al. MAHLI image examples of each of the textural classes of rocks in the Bradbury group and (h) the Murray mudstone in the Mount Sharp group. White scale bars are 1 cm across. Classes were divided on the basis of grain size and/or surface texture and coloring and include (Figure 2a) Sheepbed mudstone (10 APXS analyses; example is Wernecke_preDRT, sol 168), exposed in Yellowknife Bay with grains finer than the limit of resolution; (Figure 2b) fine sandstone (15 APXS analyses; example is Aillik1, sol 322), well-sorted siltstones to sandstones; (Figure 2c) sandstone (22 APXS analyses; example is Gillespie_Lake, sol 132), medium to pebbly sandstones; (Figure 2d) conglomerate (15 APXS analyses; example is Bardin_Bluffs, sol 394), primary grain sizes >1 mm, rounded grains, clasts up to 6 cm; (Figure 2e) uncertain (13 APXS analyses; example is Morehouse, sol 503), float rocks with poorly defined grain boundaries, sometimes weather like conglomerates; (Figure 2f) possible igneous (4 APXS analyses; example is Clinton, sol 512), small group of float rocks and one clast in a conglomerate with porphyritic textures, shortened to “igneous” in plot legends; (Figure 2g) diagenetic (36 APXS analyses; example is CumberlandNewRP_LIBs, sol 277), rocks with clearly diagenetic textures including preferential cementation and fracture fills; and (Figure 2h) Murray mudstone (27 APXS analyses; example is Punchbowl2, sol 813), mudstone observed at