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Articles 31 - 33 of 33
Full-Text Articles in Physical Sciences and Mathematics
Temporal And Spatial Evolution Of Wave-Induced Ripple Geometry: Regular Versus Irregular Ripples, Timothy Nelson, George Voulgaris
Temporal And Spatial Evolution Of Wave-Induced Ripple Geometry: Regular Versus Irregular Ripples, Timothy Nelson, George Voulgaris
George Voulgaris
Concurrent observations of inner shelf near bed hydrodynamics and acoustic imagery of the seabed are used to relate wave-induced ripple geometry (wavelength and orientation) to near bed directional wave velocities. The observations were collected on the continental shelf of the South Atlantic Bight at water depths of 9.5 and 30 m off the coasts of South Carolina (median size 177 mm) and Georgia (388 mm), respectively. 2-D spectral analysis techniques are performed on the imagery to automate detection of ripple wavelength, orientation, and irregularity. Our analysis shows that ripple irregularity is a time-dependent process dependent on magnitude, direction, and duration …
Atmospheric Methane Over The Arctic Ocean: Thermal Ir Satellite And Ship- Based Observations, Leonid Yurganov
Atmospheric Methane Over The Arctic Ocean: Thermal Ir Satellite And Ship- Based Observations, Leonid Yurganov
Leonid Yurganov
Recent warming of the Arctic stimulated speculations about dissociation of methane hydrates in the Arctic seabed and a new climatic positive feedback. Here, for the first time, methane low tropospheric satellite retrievals over the Arctic from two instruments: AIRS (Atmospheric IR Sounder) and IASI (Infrared Atmospheric Sounding Interferometer) were analyzed. Analyzed are data for areas over open water with high values of the vertical thermal contrast (ThC, defined here as the temperature difference between the surface and altitude of 4 km); they have been found to be reliable. The seasonal cycles of the data well correlate with the cycles measured …
Global Meteorological Drought – Part 2: Seasonal Forecasts, Will Pozzi
Global Meteorological Drought – Part 2: Seasonal Forecasts, Will Pozzi
Will Pozzi
Global seasonal forecasts of meteorological drought using the standardized precipitation index (SPI) are produced using two data sets as initial conditions: the Global Precipitation Climatology Centre (GPCC) and the European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-Interim reanalysis (ERAI); and two seasonal forecasts of precipitation, the most recent ECMWF seasonal forecast system and climatologically based ensemble forecasts. The forecast evaluation focuses on the periods where precipitation deficits are likely to have higher drought impacts, and the results were summarized over different regions in the world. The verification of the forecasts with lead time indicated that generally for all regions the …