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.
Hurricane Patricia (Oct., 2015) and Supertyphoon Haiyan (Nov. 2013) are the 2 ‘Champion’ Tropical Cyclones in the recorded human history. These 2 cyclones can be called category ‘6’ super cyclones, because both reached an astonishing peak intensity, far exceeding the existing highest category of 5 in the tropical cyclone scale. This illustration shows the approach of these 2 super ‘cyclones’ to the Philippines and Mexico, i.e. the 2 sides of the Pacific Ocean. These 2 champion cyclones are compared and reasons are explore on their extra-ordinary intensifications. The tropical cyclone trajectories and intensity are obtained from the best track archives of National Hurricane Center’s (NHC; http://ftp.nhc.noaa.gov/atcf/archive/) and the US Joint Typhoon Warning Centre (JTWC; https://metoc.ndbc.noaa.gov/web/guest/jtwc/best_tracks/). The visible images are provided from the Rapid Response imagery from the Land, Atmosphere Near real-time Capability for EOS (LANCE) system operated by the NASA/GSFC/Earth Observing System Data and Information System (EOSDIS)(https://lance.modaps.eosdis.nasa.gov/cgibin/imagery/gallery.cgi). The image of Hurricane Patricia over Mexico was taken from the MODIS instrument aboard NASA’s Terra satellite on Oct. 23, 2015 at 17:30 UTC/1:30 p.m. EDT. The image of supertyphoon Haiyan approaching the Philippines was taken from the MODIS instrument aboard NASA’s Aqua satellite on Nov. 7, 2013 at 04:25 UTC/Nov. 6 at 11:25 p.m. EDT. Thanks to NASA/EOSDIS (https://lance.modaps.eosdis.nasa.gov/cgi-bin/imagery/gallery.cgi) for providing the visible images from Terra and Aqua/MODIS, and to NHC (http://ftp.nhc.noaa.gov/atcf/archive/), JTWC(https://metoc.ndbc.noaa.gov/web/guest/jtwc/best_tracks/) for TCs’ best track and intensity data.
image shows macrocracks visible within an internal vertical saw-cut face of tuffeau blocks (a) 1,
image shows the occurrences of the pseudotachylytes in the Bajiaomiao village. (a–c) The pseudotachylyte veins present
In Smart et al., image shows results of the updated classification algorithm at Shrimp Vent with the main area of sampling indicated by the dashed white circle. (a) 2D photomosaic of the Shrimp Vent area showing the distribution of bacterial mats and seafloor characteristics. (b) Gridded results of the SVM classification method showing seafloor (blue), bacteria (green) and active venting (yellow). (c)Classification algorithm results showing only areas of active venting in red indicating the spatial distribution of active venting.
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°.
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
Guimbar et al., investigated the eastern tropical fresh pool (EPFP) spatial and temporal dynamics. The maximal surface extension of the EPFP exhibits a very large interannual variability. Over the past decade, two extreme events occurred, clearly related to the El Niño-Southern Oscillation (ENSO) phases with associated anomalies of precipitation, surface currents, and trade wind in the central Pacific. In particular, changes of the atmospheric freshwater fluxes and ocean surface currents during winter 2014 seems to trigger the onset of an abnormal fresh event related to the strong El Niño 2014–2015, leading to these unprecedented maximum values of the EPFP maximum extent (October-November) in 2014 and 2015.
In Ficklin and Novick [DOI: 10.1002/2016JD025855], trends of vapor pressure deficit (VPD), saturation vapor pressure (es) and actual vapor
In Pohl et al., analysis of the patterns of marine primary productivity and oxygen concentration simulated using the 440 Ma land-sea mask and a solar forcing level of 350 W m−2. (a) Surface primary productivity. White and red dots respectively stand for sediments of Katian age associated with dysoxic-to-oxic and at least intermittently anoxic conditions (i.e., black shales, including interbedded black shales), after
In Pedersen et al. [DOI: 10.1002/2016RS006079], overview of the experimental observation setup.
Conceptual model of the paleoceanographic changes related to the dynamics of PP in the northern SCS.
In Roman and Jaupart [10.1002/2016JB013912], the development of downwellings at the leading edge of the intrusion in two different experiments (nos. 1425 and 1427) in the jellyfish regime. The only difference between these two experiments is the intrusion volume, which varies by a factor of 5.6. All the other parameters are identical. This shows that the downwelling dimensions increase with the intrusion volume.
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.
In Chen et al. [DOI: 10.1002/2016JD026427], figure 1 shows schematic summary of the two mechanisms of interhemispheric transport:
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).