Results 61 to 70 of about 14,203 (319)
Geophysical applicability of atomic clocks: direct continental geoid mapping [PDF]
Geophys. J. Int. 2012, vol 191, pages 78-82, 2012 The geoid is the true physical figure of the Earth, a particular equipotential surface of the gravity field of the Earth that accounts for the effect of all subsurface density variations. Its shape approximates best (in the sense of least squares) the mean level of oceans, but the geoid is more difficult to determine over continents. Satellite missions
arxiv +1 more source
On the connection of the Ecuadorian Vertical Datum to the IHRS
Journal of Geodetic Science, 2023 In this work, the determination of the discrepancy between the Ecuadorian Vertical Datum (EVD) and the International Height Reference System (IHRS) is presented.
Carrión José L. +2 more
doaj +1 more source
, 2016 In this study, we propose an approach for determining the geopotential difference using high-frequency-stability microwave links between satellite and ground station based on Doppler cancellation system.
Ziyu Shen, W. Shen, Shuangxi Zhang
semanticscholar +1 more source
Air–sea feedback in the northeastern tropical Atlantic in boreal summer at intraseasonal time‐scales
Quarterly Journal of the Royal Meteorological Society, EarlyView.This study investigates air–sea interactions in the northeastern tropical Atlantic at intraseasonal time‐scales, focusing on the feedback between sea‐surface temperature (SST) and surface winds. It finds that trade wind anomalies drive SST changes, creating a feedback loop that lasts 2–3 weeks.
Mamadou Thiam +4 more
wiley +1 more source
Links between hail hazard and climate modes of variability across Australia
Quarterly Journal of the Royal Meteorological Society, EarlyView.Climate modes of variability influence hail‐prone atmospheric conditions, but links between these drivers and hail hazard across Australia have not been well constrained. We examine relationships between the El Niño Southern Oscillation (ENSO), Indian Ocean Dipole (IOD), and Southern Annular Mode (SAM) and proxy‐derived hail‐prone days across the ...
Quincy F. Tut +2 more
wiley +1 more source
A Synoptic Analysis of Cyclonic Activity During 1961-2003 [PDF]
مخاطرات محیط طبیعی, 2012 Mid-latitude cyclones play an important role in precipitation over Iran. A survey on 6-hourly geopotential height of 1000 hPa level showed that the number of cyclones in the studied area reveals a positive trend.
Seyyed Abolfazl Masoodian
doaj +1 more source
Quarterly Journal of the Royal Meteorological Society, EarlyView.Cloud microphysical processes and low‐level moisture availability affect the ascent of the warm conveyor belt (WCB) airstream. We quantify the relative influence of perturbations to uncertain cloud microphysical model parameters and environmental conditions in the lower troposphere on WCB ascent, as well as on associated precipitation characteristics ...
Annika Oertel +3 more
wiley +1 more source
Is it possible to improve the present LAGEOS-LAGEOS II Lense-Thirring experiment? [PDF]
Classical and Quantum Gravity, vol.19, no.21, pp. 5473-5480, 2002, 2002 The Lense-Thirring effect is currently being measured by means of a combination of the orbital residuals of the nodes of LAGEOS and LAGEOS II and the perigee of LAGEOS II. The total error is of the order of 20%. The most insidious systematic error is due to the mismodelled even zonal harmonics of the geopotential and amounts to 12.9%, according to ...
arxiv +1 more source
EVALUATION OF RECENT GLOBAL GEOPOTENTIAL MODELS BY GNSS/LEVELLING DATA: INTERNAL AEGEAN REGION
, 2016 Global geopotential models of spherical harmonic coefficients are used to determine the external gravitational field of the Earth. These coefficients are derived from satellite orbit perturbations, terrestrial gravity anomalies and altimeter data ...
M. Yilmaz +3 more
semanticscholar +1 more source
Unbiased calculation, evaluation, and calibration of ensemble forecast anomalies
Quarterly Journal of the Royal Meteorological Society, EarlyView.Standard methods for calculating ensemble forecast anomalies result in statistical inconsistencies between forecast and verification anomalies, even if the underlying forecasts are perfectly reliable. An unbiased evaluation of anomaly‐based ensemble forecasts must account for differences in climatological sampling uncertainty between forecasts and ...
Christopher D. Roberts +1 more
wiley +1 more source