Results 41 to 50 of about 1,063 (182)
Quarterly Journal of the Royal Meteorological Society, EarlyView.The climatological‐error covariance matrix used in three‐dimensional variational data assimilation (3DVar) provides smooth and isotropic increments spread to long distances. In contrast, three‐dimensional ensemble variational data assimilation (3DEnVar) with a purely ensemble‐error covariance matrix provides inhomogeneous increments and contains the ...
Kaushambi Jyoti +3 more
wiley +1 more source
Regional Egypt tropospheric mapping function model
Alexandria Engineering Journal, 2018 It’s essential to find out the delay caused by the troposphere layer to be able to get more accurate results. The precise positioning is very essential for accurate geodetic applications e.g., Crustal deformation and military purposes.
Ahmed Nabil Mohammed +3 more
doaj +1 more source
Tropospheric wet path-delay measurements [PDF]
IEEE Transactions on Antennas and Propagation, 1982 A dual-channel microwave radiometer measuring the sky brightness temperature at the frequencies 21.0 and 31.4 GHz, an infrared spectral hygrometer (IRSH) measuring the ratio of the radiation from the sun at the wavelengths 931 and 880 nm, and radiosondes have been used simultaneously to determine the excess path length due to water vapor (wet path ...
openaire +1 more source
Forecast‐Error Diagnostics in Neural Weather Models
Quarterly Journal of the Royal Meteorological Society, EarlyView.Deep learning weather prediction models enable efficient forecast‐error diagnostics through auto‐differentiation and low computational cost. We apply grid‐point relaxation and gradient‐based error sensitivity to identify key forecast‐error sources. Results show that medium‐range forecasts in the midlatitudes benefit most from relaxing the stratosphere ...
Uroš Perkan +2 more
wiley +1 more source
Asymmetry in the effect of North Atlantic sea surface temperature on the eddy‐driven jet
Quarterly Journal of the Royal Meteorological Society, EarlyView.Projections of climate over Europe and the Atlantic are uncertain due to the uncertainty surrounding future changes in North Atlantic sea surface temperatures (SSTs). Here, we demonstrate that warming in the North Atlantic Ocean is linked to a transition to a negative phase of the North Atlantic Oscillation, as well as to an equatorward displacement of
Paul‐Arthur Monerie +3 more
wiley +1 more source
Multiscale numerical sensitivity simulations of a mesoscale gravity‐wave event
Quarterly Journal of the Royal Meteorological Society, EarlyView.High‐resolution WRF simulations of the February 14–15, 1992 STORM‐FEST event show that mesoscale gravity‐wave genesis occurs via geostrophic adjustment within an upper‐level unbalanced jet, while wave ducting governs maintenance. High‐resolution (1 km), improved physical parameterization, and targeted sensitivity simulations demonstrate that upstream ...
Rajan Bhandari +2 more
wiley +1 more source
Remote Sensing, 2015 This study successfully uses satellite altimetry, including Topex/Poseidon and Jason-2, retrieved by novel retrackers to monitor vertical land motions in Southwestern Taiwan. Satellite altimetry was originally designed to measure open oceans, so waveform
Chung-Yen Kuo +3 more
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International Journal of Satellite Communications and Networking, EarlyView.ABSTRACT We present experimental results on the relationship between rain attenuation and simultaneous scintillation during rain events, based on beacon signal measurements at 19.7 (Ka‐band) and 39.4 GHz (Q‐band) from the geosynchronous Alphasat satellite (25° E), received at two Italian ground stations, Spino d'Adda (42.1° slant path) and Tito Scalo ...
Miles Turner +5 more
wiley +1 more source
Correction of Atmospheric Delay Error of Airborne and Spaceborne GNSS-R Sea Surface Altimetry
Frontiers in Earth Science, 2022 Improving the measurement accuracy is a necessary condition for sea surface altimetry using the Global Navigation Satellite System Reflectometry (GNSS-R).
Zhengjie Yan +7 more
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Научный вестник МГТУ ГА, 2016 The article analyses the influence of dynamical errors, ionospherie and tropospherie errors on navigational definition of aircraft. The quantity of these errors for the Tumen region is cited. Comparative analysis of these errors is given.
D. A. Zatuchny
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