Current AGU Journal Covers

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.

Dynamics of primary productivity in the northern South China Sea over the past 24,000 years in G-Cubed

Conceptual model of the paleoceanographic changes related to the dynamics of PP in the northern SCS.

The light and dark-blue segments represent low-nutrient water and high-nutrient water, respectively. The white arrows represent wind-driven water mixing,
which was weaker in the Holocene and stronger during the deglaciation and LGM. ‘KI’ means Kuroshio Intrusion into the SCS and ‘KC’ means the Kuroshio
Current in the western Pacic. (a) During the Holocene non-El Niño years, the Kuroshio only intruded into the northeastern SCS resulting in a shallow nutricline
and a high PP in the northern SCS. (b) In the Holocene El Niño years, the Kuroshio Intrusion into the northern SCS (along with a weakened mixing) led to a deep
nutricline level and a low PP. In the LGM and the last deglaciation, the Kuroshio might have moved eastward (or altogether weakened), variations of EAWM, sea
level, and rainfall control the PP in the northern SCS.

A miniature, low-power scientific fluxgate magnetometer: A stepping-stone to cube-satellite constellation missions in JGR: Space Physics

The Ex-Alta 1 Cube-Satellite, to be launched in late 2016 as part of the ESA QB50 constellation mission, will demonstrate the potential

for scientifically valuable magnetic field measurements from a Cube-Satellite. For more information on the magnetometer, boom, and satellite

40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia in G-Cubed

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.

Emission factors of health- and climate-relevant pollutants measured in home during a carbon-finance-approved cookstove intervention in rural India in GeoHealth

Photograph of sunlight illuminating smoke from a traditional cookstove in a rural Indian kitchen. See Grieshop et al. [DOI:10.1002/2017GH000066]

to learn more about how particulate matter emissions varied in traditional and alternative cookstoves during a stove replacement intervention in this
village.

Decoupling of coral skeletal δ13C and solar irradiance over the past millennium caused by the oceanic Suess effect in Paleoceanography

In Deng et al., satellite image of Hainan Island and the northern SCS. Yellow stars indicate sampling locations.

Issue Information in JGR: Space Physics

Sumatra tsunami amplitude map with travel time shown by contours in 30 min time intervals. Bagiya et al., explain ahead-of-tsunami ionospheric disturbances from tsunami-generated acoustic gravity waves.

Structure and dynamics of a subglacial discharge plume in a Greenlandic fjord in JGR: Oceans

photograph of the JetYak as it approaches the glacier face taken from a helicopter. Inserts

show a picture of the JetYak and of the boat from which it was controlled.

Dry deposition of particles to canopies—A look back and the road forward in JGR: Atmospheres

Comparison of the nontransport processes that affect PM

2.5
concentration in the
lowest 100 m of the atmosphere as estimated from a regional-scale air quality model simulation for June 2013. The area over which the results
(averages) apply is about 500 km × 500 km, as indicated by the inner square of the CAMx domain illustration inset. The time scale markings indicate
noon (EST). The dry deposition estimates result from an assumption about the deposition velocity that is a focus of the current presentation. The time
period selected for this illustration was free of rainfall.

in Earth's Future

In Shan et al., Top: CO2 emissions from seven cities in Tibet, 2014. The colors of the map show the per capita emissions (CO2 emissions/population, in tons) of each city. Greener cities have lower per capita emissions while redder cities have higher ones. The blue circlesrepresent emissions intensity (CO2 emissions/total GDP) for each city; larger circles refer to a higher emission intensity. The numbers on the map show the emission intensity of each city (in tons per thousand yuan); for example, the emission intensity of Lhasa is 0.84 tons per thousand yuan. Bottom: emissions from fossil fuel types and sectors in Tibet, 2014.

Relative linkages of stream water quality and environmental health with the land use and hydrologic drivers in the coastal-urban watersheds of southeast Florida in GeoHealth

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.

Empirical modeling of plasma clouds produced by the Metal Oxide Space Clouds experiment in Radio Science

In Pedersen et al. [DOI: 10.1002/2016RS006079], overview of the experimental observation setup.

Pacific-Atlantic Ocean influence on wildfires in northeast China (1774 to 2010) in GRL

Fire-scarred Dahurian larch from the Daxing’an Mountains in northeast China.

CO2 flux from Javanese mud volcanism in JGR: Solid Earth

In Queißer et al. [10.1002/2017JB013968], snapshots of a bursting gas bubble of the main vent (vent II) at the Bledug Kuwu complex. The bursts had a duration of approximately ~2s.

Improvements to the snow melting process in a partially double moment microphysics parameterization in JAMES

In Brown et al., idealized squall line experiments using (left column) M20Efrr and (right column) M75Efrr. Top row (a, b) shows surface radar refl ectivity in dBZ, middle row (c, d) shows vertical cross section of line-averaged radar refl ectivity, and bottom row (e, f) shows vertical cross section of line-averaged median drop diameter in mm.

A decade of volcanic construction and destruction at the summit of NW Rota-1 seamount: 2004–2014 in JGR: Solid Earth

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.

The role of monsoon-like zonally asymmetric heating in interhemispheric transport in JGR: Atmospheres

In Chen et al. [DOI: 10.1002/2016JD026427], figure 1 shows schematic summary of the two mechanisms of interhemispheric transport:

(a) the boreal winter Hadley cell (green) transporting mass across the equator in the lower troposphere and (b) the boreal summer monsoon (red),
characterized by the lower level convergence and upper level divergence, which exchanges mass between the two hemispheres through the upper
tropospheric anticyclone. In Figures 1a and 1b, gray dashed lines indicate the annual mean residual meridional circulation, and blue lines depict
isentropic surfaces and eddy mixing.

Ceres's obliquity history and its implications for the permanently shadowed regions in GRL

Ceres has plenty of permanently shadowed regions (mapped in blue) at the present day when its obliquity is small. However, due to obliquity changes in the past, only few permanent shadows remain.

Panel regressions to estimate low-flow response to rainfall variability in ungaged basins in WRR

Case study of projected changes in rainfall on the Island of Maui, Hawaii, and associated estimates of changes in low flows. (a) Percentage change in average annual rainfall from statistical downscaling models [Timm et al., 2015] at ungaged basins between 1978–2007 and 2071–2099. (b) Percentage change in average annual rainfall from dynamical downscaling models [Zhang et al., 2012; APDRC, 2016] at ungaged basins between 1978–2007 and 2090–2109, Maui Hawaii. (c) Percentage changes in math formulaQ70k¯ associated with rainfall A computed using rainfall elasticity ( math formulaεx) values from random-effects panel regressions for ungaged basins and from streamflow records for gaging stations. (d) Percentage changes in math formulaQ70k¯ associated with rainfall B computed using math formulaεx values from fixed effects panel regressions for ungaged basins and from streamflow records for gaged basins. Basins without an estimate of changes in low flow are classified as nonperennial and streams in these basins do not have natural low flows for recent conditions. Some ungaged streams may be misclassified.

Atmospheric escape from unmagnetized bodies in JGR: Planets

 Venus, Mars, Titan, Pluto, and a comet are shown at the same scale to illustrate the relative sizes of the

interaction region (blue) produced by a flowing plasma—the solar wind (light green) in all cases but Titan that is sitting in the magnetosphere (red)—
impinging on the planetary exosphere (orange). The supersonic solar wind is slowed and compressed behind an upstream bow shock with the plasma
deflected around the obstacle in a sheath flow (dark green).

Early Results: Juno at Jupiter in GRL

Juno’s MicroWave Radiometer (MWR) passively observes beneath Jupiter’s cloud tops. This artist’s conception shows real data from the 6 MWR channels, arranged by wavelength.