Results 61 to 70 of about 1,044,226 (312)

Evaluation of GOCE/GRACE and combined global geopotential models using GNSS/levelling data over Nigeria

Studia Geophysica et Geodaetica
Global Geopotential Models (GGMs) provide valuable information about Earth’s gravity field functionals, such as geoid heights and gravity anomalies. However, ground-based datasets are required to validate these GGMs at the regional and local scales.
Michael Bako, Basem Elsaka, Jürgen Kusche, L. Fenoglio-Marc   +3 more
semanticscholar   +1 more source

Exploration of the use of short‐wave infrared radiances in weather forecasts model Part II: Data assimilation and forecast impact assessment

Quarterly Journal of the Royal Meteorological Society, EarlyView.
The standalone non‐local thermodynamic equilibrium (NLTE) bias correction schemes, utilizing a look‐up‐table and a linear regression method developed in Part I and new quality control procedures for short‐wave infrared radiances (SWIR), were tested within a data assimilation framework.
Agnes H. N. Lim, Zhenglong Li, Di Di, James A. Jung   +3 more
wiley   +1 more source

An analysis of methods for gravity determination and their utilization for the calculation of geopotential numbers in the Slovak national levelling network

Contributions to Geophysics and Geodesy, 2016
The vertical reference system in the Slovak Republic is realized by the National Levelling Network (NLN). The normal heights according to Molodensky have been introduced as reference heights in the NLN in 1957.
Miroslava MAJKRÁKOVÁ, Juraj PAPČO, Pavol ZAHOREC, Branislav DROŠČÁK, Ján MIKUŠKA, Ivan MARUŠIAK   +5 more
doaj   +1 more source

A case study of temperature tendency mechanisms operating over northern Africa during and following midlatitude winter troughs

Quarterly Journal of the Royal Meteorological Society, EarlyView.
An Iberia‐Central Mediterranean trough sequence (7–10 February 2018) delivers anomalous low‐level temperature tendencies attributable to dynamics across most of northern Africa, with warming over northeastern Africa, especially 10–12 February into the eastern Sahel. An ECMWF product attributes the tendencies (see Figure).
Neil Ward, Andreas H. Fink, Richard J. Keane, Douglas J. Parker   +3 more
wiley   +1 more source

Physically consistent mesoscale model evaluation in complex terrain

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This study introduces a novel approach for evaluating mesoscale atmospheric models in complex terrain by selecting physically consistent grid points and applying height‐based corrections. The method corrects for sensor height and terrain elevation differences between model and observations using a time‐varying lapse rate.
Gaspard Simonet, Mathias W. Rotach, Manuela Lehner   +2 more
wiley   +1 more source

Gravity field modelling and gravimetry

Geodesy and Cartography, 2015
The summary of research activities concerning gravity field modelling and gravimetric works performed in Poland in the period of 2011-2014 is presented.
Krynski Jan
doaj   +1 more source

Meteorological conditions leading to a catastrophic, rain‐induced landslide in Cameroon in October 2019

Quarterly Journal of the Royal Meteorological Society, EarlyView.
October 2019 was characterized by three main multiday wet spells in Bafoussam and Dschang. Our results indicated that wet spells were influenced by a vortex pair near the Gulf of Guinea, a strong Sahara Heat Low located anomalously far east and north, a northward shift of the intertropical discontinuity, an enhancement of the inland penetration of the ...
Derbetini A. Vondou, Marlon Maranan, Andreas H. Fink, Peter Knippertz   +3 more
wiley   +1 more source

On the reliability of the so far performed tests for measuring the Lense-Thirring effect with the LAGEOS satellites

, 2005
In this paper we will show in detail that the performed attempts aimed at the detection of the general relativistic Lense-Thirring effect in the gravitational field of the Earth with the existing LAGEOS satellites are often presented in an optimistic and
Allison, Casotto, Cheng, Ciufolini, Ciufolini, Ciufolini, Ciufolini, Ciufolini, Ciufolini, Ciufolini, Ciufolini, Eanes, Everitt, Gruber, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Kaula, Lense, Lucchesi, Lucchesi, Lucchesi, Lucchesi, Lucchesi, Lucchesi, Lämmerzahl, Lämmerzahl, Mashhoon, Nordtvedt, Pavlis, Pavlis, Reigber, Reigber, Reigber, Reigber, Ries, Ruggiero, Schiff, Schäfer, Tapley, Tapley, Vespe, Will   +53 more
core   +1 more source

Global geopotential models from Satellite Laser Ranging data with geophysical applications: A review

South African Journal of Science, 2012
The launch of artificial satellites (as early as in 1957), specifically the launch of the first laser tracked satellite, Beacon-B, in 1964, has provided data sets which have allowed researchers to probe the long to medium components of the gravitational field of the Earth.
Botai, Mihloti Christina, Combrinck, Ludwig   +1 more
openaire   +4 more sources

Almost Everything You Always Wanted to Know About Representing Gravity in Global Models but Were Afraid to Ask

Journal of Advances in Modeling Earth Systems
For over 60 years, an approximation involving spherical geopotentials has underlain the representation of gravity in global numerical models of Earth's atmosphere and oceans. This article explores how departures from sphericity can be allowed by assuming
Andrew Staniforth, Andy White
doaj   +1 more source