Gulf of Mexico versus Atlantic populations of several coastal species in the southeastern United States are known to differ sharply in genetic composition, but most transitional zones have not previously been examined in detail. Here we employ molecular markers from mitochondrial and nuclear loci to characterize cytonuclear genetic associations at meso- and microgeographic scales along an easte...

A second phase-conjugation experiment was conducted in the Mediterranean Sea in May 1997 extending the results of the earlier time-reversal mirror experiment @Kuperman et al., J. Acoust. Soc. Am. 103, 25–40 ~1998!#. New results reported here include ~1! extending the range of focus from the earlier result of 6 km out to 30 km, ~2! verifying a new technique to refocus at ranges other than that o...

We determined the variations in seismic structure beneath southern California by using a tomographic method of inversion on teleseismic P delays recorded with the Southern California Array. The algorithm employed was a modified form of an Algebraic Reconstruction Technique (ART) used in medical X-ray imaging. Deconvolution with an empirically estimated point spread function was also used to hel...

Eight years ago, some scientists computed for a 1.1-km diameter asteroid (1950 DA) a 0.0 to 0.3 per cent probability for colliding with Earth. Not long after this, a quasi-analytic model for wave propagation was used to describe the dynamics of the tsunami generated by the asteroid impact somewhere at 600 km east of the U.S. coast. Starting from the same initial conditions, our paper resumes th...

[1] A global 2-month comparison is presented between the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) and the Moderate Resolution Imaging Spectroradiometer (MODIS) for both cloud detection and cloud top height (CTH) retrievals. Both CALIOP and MODIS are part of the NASA A-Train constellation of satellites and provide continuous near-coincident measurements that result in over 28 mi...

Elevated plateaus with deeply incised valleys characterise elevated, passive continental margins (EPCMs) in all climate zones. These features are, however, a topic of debate regarding when and how the large-scale landscapes formed. We have investigated mapped partly glaciated landscape North-East Greenland (70–78°N). The area consists crystalline basement Palaeozoic–Mesozoic rift basins, capped...

The Larsemann Hills range is an ice-free oasis on the Ingrid Christensen Coast of Princess Elizabeth Land, East Antarctica, which includes Bharti Island, Fisher Island, McLeod Island, Broknes Peninsula, Stornes Peninsula, and several other islands, promontories, and nunataks. The Larsemann Hills is an ice-free area of approximately 50 km2, located halfway between the Vestfold Hills a...

12 Wide swath synthetic aperture radar (SAR), exemplified by the multibeam ScanSAR modes of Radarsat, can potentially deliver global near–real-time coastal wind fields with nearly 2 orders of magnitude greater spatial resolution ( 300 m) than conventional (active or passive) scatterometers ( 25 km). But this superior resolution comes with caveats. An understanding of the small-scale ocean scatt...