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Showing 1 to 20 of 25 for “"precipitable water"”.
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The estimation of precipitable water vapour from GPS measurements in South Africa
… it is possible to estimate the amount of precipitable water vapour (PWV) in the atmosphere. The application of the GPS data for the estimation of PWV in the atmosphere is not a new concept and has been described in numerous publications and reports since the early 1990's (Bevis et al., …
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Using total precipitable water anomaly as a forecast aid for heavy precipitation events
… data-denied regions. The hypothesis that total precipitable water anomaly (TPWA) will be positive and increasing preceding heavy precipitation events is tested in order to establish an understanding of TPWA evolution. Results are then used to create a precipitation forecast aid. The operational, …
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Developing a Multi-Band GNSS Remote Sensing Station To Measure Precipitable Water Vapor for Flash Flood Nowcasting
… offers an established alternative for measuring precipitable water vapor and is currently integrated into several numerical weather models. Recent research demonstrates that commercial-grade GNSS receivers can produce tropospheric products comparable to those from geodetic-grade equipment. The …
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Determination of the suitability of MT Gamsberg in Namibia for millimetre wave stronomy by measurements of the precipitable water vapour
Precipitable Water Vapour (PWV) is the amount of water vapour in the atmospheric column above a location equivalent to the amount of liquid precipitation that would result if all the water vapour in the column was condensed. Water vapour is the main source of opacity in the Earth’s atmosphere at …
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Kytoon observations of the Lake Mead boundary layer
… find boundary layer characteristics of height, precipitable water content, and precipitable water content residence time. In addition, the boundary layer precipitable water content was compared to tributary inflows in an approximated Lake Mead water compariSon The kytoon data was unique and …
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Moisture transport associated with the summertime North American monsoon.
The origins and transport of water vapor into the semi-arid Sonoran Desert region of southwestern North America are examined for the July-August wet season. Vertically-integrated fluxes and flux divergences of water vapor are computed for the 8 summers, 1985-1992, from ECMWF mandatory-level …
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Precipitation Recycling as a Mechanism for Ecoclimatological Stability Through Local and Non-Local Interactions
… in not driven by changes in evapotranspiration. Precipitable water, sensible heat and moisture fluxes are the main drivers of recycling variability in the Midwest. However, the drier soil moisture conditions over the NAMS region limit evapotranspiration, which will drive recycling variability. In …
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A lightning threat index for South Africa using numerical weather prediction data
… available potential energy, lifted index, precipitable water, equivalent potential temperature, relative humidity and air temperature. This study identifies the parameter from each of the six groups capable of predicting the occurrence of lightning over southern Africa the best during …
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Sensing atmospheric water vapour using the global positioning system
Atmospheric water vapour measurements are of importance to meteorologists, radio astronomers and geodesists. Precipitable water vapour (PWV) is a greenhouse gas to be reckoned with in numerical weather models and climate change studies, it is a nuisance in centimetre-wavelength radio astronomy and …
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The Relationship Between Atmospheric Circulation Patterns And Water Surface Elevation In Devils Lake, North Dakota: 1965-2010
… lacks an outlet until the lake level reaches a water surface elevation (WSE) of 1,458 ft asl (444.4 m). Lake levels have fluctuated continuously since the last glaciation, in response to natural climatic variations. The lake has risen steadily since 1993, severely affecting the infrastructure …
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A GPS-IPW Based Methodology for Forecasting Heavy Rain Events
… western Virginia is the source of the headwater streams for the New, the Roanoke, and the James rivers. The region is prone to flash flooding, typically the result of localized precipitation. Fortunately, within the region, there is an efficient system of instruments for real-time data …
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Atmospheric delay modeling for satellite laser altimetry
… allowed us to investigate the estimation of precipitable water vapor using GPS data. The validation studies have shown that our atmospheric delay algorithm errors are well within the ICESat error budget of 20 mm. The overall global delay errors are estimated to be approximately 5.4 mm and the …
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Examining environmental and life history correlates of winter and migratory movements in a nomadic Arctic-breeding passerine
… wintering buntings. Further, surface pressure, precipitable water in the atmosphere, and wind speeds were important predictors of whether detections were associated with differentiating wintering or migration movements. However, we found no evidence to support the role of sex or body size …
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Variations in the stable isotope compositions of water vapor and precipitation in New Mexico : links to synoptic-scale weather
The D content of atmospheric water vapor over Albuquerque, New Mexico was measured for 30 months with air samples captured one to three times daily on the roof of a three story building. In addition, the D and O isotopes for 106 samples of surface water vapor and 40 samples of precipitation from …
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Improving Convective Permitting Model Simulations of Extreme Precipitation using Object-Based Tracking and Data Assimilation
… to test the impact of assimilating GPS-derived Precipitable Water Vapor (PWV) using different densities of observation. Results from a 40-member WRF CPM ensemble are produced for two fairly different monsoon events in the year 2021, and demonstrate that assimilating bias-corrected synthetic PWV …
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Optimised ground-based near-infrared instrumentation for robotic exoplanet transit surveys
… method for the induced effects from varying precipitable water vapour (PWV) in our atmosphere, specifically on differentially resolved light curves from SSO. This work succeeded in reducing false variability of time-series data from late M, L type stars on both long and short timescales, to …
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On the role of warm rain clouds in the tropics
… field-of-view (FOV) to retrieve cloud liquid water path (LWP), total precipitable water, and wind speed. Resampling the TMI measurements to a common FOV is found to decrease retrieved LWP by 30%. These deconvolved brightness temperatures are combined with cloud fraction from the Visible …
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Tropical orographic rainfall regimes according to the tropical rainfall measuring mission
… convection, 700 hPa specific humidity, total precipitable water, 1000-700 hPa layer relative humidity, 700-300 hPa layer relative humidity, cross-barrier flow, mean virtual potential temperature, lapse rate of the mean virtual potential temperature, Brunt-Väisälä Frequency, and the moist …
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Hailfall in a future climate using a pseudo-global warming approach
… studies, showing increases in CAPE, CIN, and precipitable water, with minor changes in VWS. Nearly all simulated events had stronger updrafts in the PGW environments, even with increases in hydrometeor loading. However, only cold-season events showed an increase in hail sizes both within the …
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Energy and Moisture Transport in the Earth Climate System: Mean State and the Perturbation Response
… climate modeling studies that employ numerical water tracers (WTs). Data made available from WTs, which track the movement of water in the aerial hydrological cycle from evaporation to precipitation, are used to analyze the sources and transport of precipitable water in the climate system. The …
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