Characterizing quasi-biweekly variability of the Asian monsoon anticyclone using potential vorticity and large-scale geopotential height field [PDF]
Atmospheric Chemistry and Physics, 2020 The spatial pattern of subseasonal variability of the Asian monsoon anticyclone is analyzed using long-term reanalysis data, focusing on the large-scale longitudinal movement.
A. Amemiya, K. Sato
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A Cut-off low at 500 hPa Geopotential Height and Rainfall Events over Iraq: Case Studies
Iraqi Journal of Physics, 2022 A cut-off low is a closed low with a low value of geopotential height at the upper atmospheric levels that has been fully detached (cut-off) from the westerly flow and move independently. A cut-off low causes extreme rainfall events in the mid-latitudes
Mohammed Abdul Raheem Jabbar +1 more
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The Accuracy Verification of Recent Global Geopotential Model based on GNSS/Levelling Data on Ground Control Points in Johor [PDF]
E3S Web of ConferencesThe external gravitational field of the Earth is mathematically represented using spherical harmonic (SH) coefficients in the global geopotential model. Hence, the appropriate global geopotential model for a region needs to determine a reference surface ...
Qi Lee Z. +5 more
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Reanalysis of summer pressure systems affecting Iran\'s atmosphere [PDF]
تحقیقات کاربردی علوم جغرافیایی, 2021 This study investigates the subtropical anticyclones and summer monsoons of the north hemisphere in the 500 hPa level, effective on Iran in a 38-year period (1975-2012).
mahdi khazaei
doaj
Longitudinal structure of stationary planetary waves in the middle atmosphere – extraordinary years [PDF]
Annales Geophysicae, 2018 One important but little studied factor in the middle atmosphere meridional circulation is its longitudinal structure. Kozubek et al. (2015) disclosed the existence of the two-cell longitudinal structure in meridional wind at 10 hPa at higher ...
J. Lastovicka, P. Krizan, M. Kozubek
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, 2017 The dominant mode of seasonal variability in the global tropical upper-stratosphere and mesosphere zonal wind is the semiannual oscillation (SAO). However, it is notoriously difficult to measure winds at these heights from satellite or ground-based ...
Anne K. Smith +3 more
semanticscholar +1 more source
Terrestrial, Atmospheric and Oceanic Sciences, 2016 We present a theory and numerical algorithm to directly determine the time-varying along-track geopotential difference and deflection of the vertical at the Gravity Recovery and Climate Experiment (GRACE) satellite altitude.
GRACE +4 more
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Preliminary experimental results of determining the geopotential difference between two synchronized portable hydrogen clocks at different locations [PDF]
arXiv, 2020 Here, we provide preliminary experimental results of the geopotential determination based on time elapse comparisons between two remote atomic clocks located at Beijing and Wuhan, respectively. After synchronizing two hydrogen atomic clocks at Beijing 203 Institute Laboratory (BIL) for 20 days as zero-baseline calibration, we transport one clock to ...
arxiv
Measuring height difference using two-way satellite time and frequency transfer [PDF]
arXiv, 2021 According to general relativity theory (GRT), the clock at a position with lower geopotential ticks slower than an identical one at a position with higher geopotential. Here, we provide a geopotential comparison using a non-transportable hydrogen clock and a transportable hydrogen clock for altitude transmission based on the two-way satellite time and ...
arxiv
Comparison of ECMWF analyses with GPS radio occultations from CHAMP [PDF]
Annales Geophysicae, 2008 A climatological validation of the 6-hourly operational ECMWF troposphere and lower stratosphere temperatures as well as geopotential heights between 1000 and 10 hPa is performed using the 2001–2007 (80 months from May 2001 to December 2007) CHAMP ...
T. Schmidt +7 more
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