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.
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.
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.
Fire-scarred Dahurian larch from the Daxing’an Mountains in northeast China.
image shows (a) Map of hydraulic head in the floodplain aquifer across three sampling seasons.
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
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
In Forouta et al., the emission of particulate matter with diameter less than 10 microns (PM10) due to dust outbreaks over the southwestern United States in March 7, 2011 (top left), March 21, 2011 (top right), April 3, 2011 (bottom left), and May 29, 2011 (bottom right). The results (in gm-3) are obtained using a newly developed windblown dust scheme implemented in the Community Multiscale Air Quality (CMAQ) modeling system
From Figure 15 of Sendrowski and Passalacqua, Process network showing the average connection between variables on the delta. (a) Process network indicating the relationships between variables that have been quantified (solid lines) and relationships with new variables to be measured (dashed lines). (b) Process network of WLD. The solid lines are the time scales of synchronization (white) and information ow (black). Dashed lines indicate the links to be measured among delta variables, such as nitrate and turbidity, at various locations.
In Oostingh et al., image shows examples of volcanic alignment and geomorphology interpretations. (a) Satellite image of Mt Eccles and (b) interpreted alignment direction. (c) Satellite image of Lake Cartcarrong (maar) and (d) interpreted elongation of the maar structure with preferred orientation.
A hot flow anomaly generates global ULF waves in the magnetosphere. Reflected ions (white arrows) from Earth’s bow shock are trapped by a tangential discontinuity (purple dashed line) and drift along it, interact with the incident solar wind ions and form a hot plasma region (yellow region) called Hot Flow Anomaly (HFA). The hot plasma region expands and form shocks (blue arrows) on two sides of the structure. In this study, an HFA was observed by Cluster 1 spacecraft, generating ULF waves in the magnetosphere globally (the red dashed lines represent the undisturbed magnetic field lines, the red solid lines represent the magnetic field lines with ULF waves).
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.
A plume of ash and steam plume rises from the summit of Popocatepetl Volcano, Mexico, in July 2014.
image shows macrocracks visible within an internal vertical saw-cut face of tuffeau blocks (a) 1,
In Pedersen et al. [DOI: 10.1002/2016RS006079], overview of the experimental observation setup.
In Youseﬁ Lalimi et al.(DOI: 10.1002/2016JG003540), the image shows (a and d) DTM, (b and e) LAI, and (c and f) NDVI for site 1 (Figures 4a–4c) and site 2 (Figures 4d–4f). The ﬁrst crest-line (closest to the shoreline) and the shoreline are shown in each map.
Galewsky et al. reviews how the isotopic composition of water vapor is impacted by deep convection and how it behaves within
In Uhlemann et al. [DOI: 10.1002/2016JF003983], image shows change in GMC from baseline model (Figure 7). Red colors indicate a relative
(a) Surface-based duct refractivity profile and Cn2 profile. (b) Propagation loss (PL) of 1 GHz wave given refractivity and Cn2 profiles in Figure 1a under no turbulence. PL calculated assuming homogeneous turbulence given (c) Cn2=10−15 and (e) 10−14. PL calculated assuming inhomogeneous turbulence given (d) Cs=10−15 and (f) Cn2=10−14.
In Guillén Ludeña et al. [DOI: 10.1002/2016JF004122], image shows visualization of coherent structures in the mean and instantaneous flow at the initial state. (a) Q isosurface (Q = 1.5) and distribution of the nondimensional bed shear stress in the mean flow, τ/τ 0, where the mean bed shear stress in the upstream part of the main channel is τ 0= 0.0045 ρU′ 2. (b) Qisosurface (Q = 18) in an instantaneous flow field and bathymetry elevation contours. The coherent structures in the instantaneous flow are colored based on the vertical elevation to better describe their position inside the flow domain. The dashed black arrows indicate KH billows advected inside the separated shear layer bordering the recirculation region.
Two errors were discovered in the originally published version. The units specified in the first footnote of Table A1 have been corrected. In addition, all instances of “(cm^2 s str)^-1” on page 19 have been replaced with “(cm^-2 sr)”. The corrected paper should be considered the version of record.