Results 231 to 240 of about 2,535 (244)

Accuracy of Normal Heights Determined Using Improved Geopotential Models

Studia Geophysica et Geodaetica, 1997
The accuracy of determining the Molodensky normal heights using geopotential models has been investigated. On the basis of geopotential model JGM-3/OSU91A the Molodensky normal heights can be computed with an accuracy of about ±35 cm at the GPS sites in the central part of Europe. On the basis of JGM-3/OSU91A improved the accuracy becomes higher, about
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Autocorrelation Functions Computed from Daily 500 mb Geopotential Height Analyses

Monthly Weather Review, 1985
Abstract A method of computing autocorrelation fields with the aid of empirical orthogonal functions (EOF) is applied. The isotropic parts of the fields are separated, and a one-parameter model of the isotropic autocorrelation field is constructed. The approximation is compared with the Bessel representations discussed by others.
Juhani Rinne, Simo Järvenoja
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Climatology of tracked persistent maxima of 500-hPa geopotential height

Climate Dynamics, 2017
Persistent open ridges and blocking highs (maxima) of 500-hPa geopotential height (Z500; PMZ) adjacent in space and time are identified and tracked as one event with a Lagrangian objective approach to derive their climatological statistics with some dynamical reasoning.
Ping Liu, Yuejian Zhu, Qin Zhang, Jon Gottschalck, Minghua Zhang, Christopher Melhauser, Wei Li, Hong Guan, Xiaqiong Zhou, Dingchen Hou, Malaquias Peña, Guoxiong Wu, Yimin Liu, Linjiong Zhou, Bian He, Wenting Hu, Raymond Sukhdeo   +16 more
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Persistence of Daily Geopotential Heights over the Southern Hemisphere

Monthly Weather Review, 1985
Abstract An analysis has been made of the persistence of geopotential heights at 1000 and 500 mb over the Southern Hemisphere for both summer and winter seasons. The focus is on lagged autocorrelation T0 the effective time between independent samples and low order autoregressive (AR) models fit to the data. A red noise AR(1) model provides the best fit
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Potential Predictability of Geopotential Heights over the Southern Hemisphere

Monthly Weather Review, 1985
Abstract An analysis of variance approach is used to estimate the potential predictability of interannual fluctuations of the seasonal mean flow over the Southern Hemisphere. The potential predictability of the 1000 and 500 mb geopotential height fields for both summer and winter is assessed.
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Recent variations in geopotential height associated with West African monsoon variability

Meteorology and Atmospheric Physics, 2018
In the present study, the atmospheric circulation patterns associated with the seasonal West Africa (WA) monsoon (WAM) rainfall variability has been investigated. The observational rainfall data from the Climatic Research Unit (CRU) and atmospheric fields from the National Center for Environmental Prediction (NCEP) reanalysis 2, from 1979 to 2014, have
Ugochukwu K. Okoro, Wen Chen, Debashis Nath   +2 more
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Optimal determination of geopotential base height for stratospheric temperature sounders

pure and applied geophysics, 1980
A technique is developed for optimally determining a base geopotential field, on which stratospheric heights may be constructed from remotely sensed temperatures. The scheme employs height information from within as well as below remote observational levels.
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Skewness, Kurtosis and Extreme Values of Northern Hemisphere Geopotential Heights

Monthly Weather Review, 1980
Abstract Twelve summers and 11 winters of Northern Hemisphere 500 and 1000 mb geopotential height are used to calculate the third and fourth moments of height in the nondimensional form of skewness and kurtosis. Geopotential height exhibits small but statistically significant departures from a normal distribution in places, especially in low latitudes.
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World Height System Specified by Geopotential at Tide Gauge Stations

2002
World Height System (WHS) can be directly specified and practically realized within a Terrestrial Reference System (TRS) by choosing a geoidal geopotential W 0. There are two possible ways how to select the W 0of the WHS datum: (1) By adopting W 0 as the reference geopotential value, to which all the Local Vertical Datums (LVDs) should be ...
M. Burša, S. Kenyon, J. Kouba, K. Raděj, V. Vatrt, M. Vojtíšková, Jaroslav Šimek   +6 more
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Which type of WNPSH indices can be better applied, defined by the geopotential height, the eddy geopotential height, or the stream function?

The western North Pacific subtropical high (WNPSH) is a crucial circulation system affecting weather and climate over China. To quantitatively measure its strength and spatial pattern, the geopotential height was firstly used to define WNSPH indices (H indices). However, due to global warming, the H indices have&#
Deqian Li, Shujuan Hu
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