• Premise of the study: The pathway of radial water movement in tree stems presents an unknown with respect to whole-tree
hydraulics. Radial profi les have shown substantial axial sap fl ow in deeper layers of sapwood (that may lack direct connection
to transpiring leaves), which suggests the existence of...
We study the late-time (t > 0.5 days) X-ray afterglows of nearby (z < 0.5) long gamma-ray bursts (GRBs) with Swift and identify a population of explosions with slowly decaying, super-soft (photon index Γx > 3) X-ray
emission that is inconsistent with forward shock synchrotron radiation associated with the afterglow....
This paper presents a methodology for performing complex wavenumber ray tracing in which both wave trajectory and amplitude are calculated. This ray-tracing framework is first derived using a scaling in which the imaginary wavenumber component is assumed to be much smaller than the real wavenumber component. The approach, based on...
We present a high-resolution Gravity Recovery and Climate Experiment (GRACE) mascon solution for Gulf of Alaska (GOA) glaciers and compare this with in situ glaciological, climate and other remote-sensing observations. Our GRACE solution yields a GOA glacier mass balance of -65 ± 11 Gta⁻¹ for the period December 2003 to...
We report here on recent developments and advances in pore-scale x-ray tomographic imaging of subsurface porous media. Our particular focus is on immiscible multi-phase fluid flow, i.e., the displacement of one immiscible fluid by another inside a porous material, which is of central importance to many natural and engineered processes....
The most damaging foliar disease of pyrethrum in Australia is ray
blight caused by Stagonosporopsis tanaceti. The probability of growers
incurring economic losses caused by this disease has been substantially
reduced by the implementation of a prophylactically applied spring
fungicide program. This has been traditionally initiated when 50% of
the...
This study of the fortnightly Mf tide comprises three main topics: (1) a new determination of the fortnightly component of polar motion and length of day (LOD) from a multidecade time-series of observed space-geodetic data; (2) the use of the polar motion determination as one constraint in the development of...
Areas with high species richness have become focal points in the establishment of
marine protected areas, but an understanding of the factors that support this diversity is still
incomplete. In coastal areas, tidal currents—modulated by bathymetry and manifested in variable
speeds—are a dominant physical feature of the environment. However, difficulties...
Climate change impacts on extreme water levels (WLs) at two United States Pacific Northwest estuaries are investigated using a multicomponent process-based modeling framework. The integrated impact of climate change on estuarine forcing is considered using a series of sub-models that track changes to oceanic, atmospheric, and hydrologic controls on hydrodynamics....
Monthly total precipitation and mean temperature climate surfaces, gridded to 30-arcseconds (≈1 km at the
equator) and available for all global land areas, are presented. These datasets are generated with a Delta downscaling
method, using the 30-arcsecond WorldClim climatologies to scale monthly anomaly grids. For monthly mean temperature,
the anomalies...