Validation of a regional weather forecast model with GPS data

Johnsen, K.-P.; Rockel, Burkhardt

doi:10.1016/s1464-1909(01)00028-4

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…The highest Pearson correlation coefficients and the smallest RMSE were observed for the level up to 1.5 km and from 3.0 to 6.0 km. Similar to other studies [23,87], the WRF model overestimated observed values of PW over the entire year. The highest overestimation and the highest RMSE, reaching 3.14 mm, were calculated for summer seasons.…”

Section: Discussionsupporting

confidence: 86%

Precipitable Water Content Climatology over Poland

2022

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In this work, the high-resolution spatial and temporal variability of precipitable water (PW) over Poland is presented. PW is one of the key parameters of the atmosphere taken into account in thermodynamic and radiation models. The daily PW values from years 2001–2010, calculated with the use of the WRF model, were compared with PW from soundings. The WRF modeled PW is in close agreement with measurements for the whole column of the troposphere and for individual levels: below 1.5 km, 1.5–3 km, 3–6 km and 6–10 km. The best agreement is observed in the lower part of the troposphere, especially for winter months. At the levels of 1.5 km to 10 km, the WRF model overestimates the PW values throughout the year, whereas up to 1.5 km PW is underestimated. The study shows an increasing trend of PW annual values between 1983 and 2010, but the trend is statistically insignificant. A significant positive trend with a high Sen’s slope is observed for the summer season up to 3 km in the troposphere, along with a significant negative tendency for spring. The trends in PW over Poland and Central Europe identified in this study contribute to the ongoing discussion on the observed climate changes.

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Section: Discussionsupporting

confidence: 86%

Precipitable Water Content Climatology over Poland

2022

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“…Since 1999 an updated version of the EM, the High Resolution Model (HRM), is available and used instead of REMO-GKSS. Johnsen and Rockel (2000) showed that the HRM produces an overall too moist atmosphere, since the operational analyses taken as initial and boundary data have also been too moist. Comparisons of simulated (HRM) and satellitederived (ISCCP-DX data) cloud properties show that the simulated total cloud cover is 10%-15% higher than the satellite-derived values.…”

Section: ) Simulations With Remo-gkss In the Forecast Modementioning

confidence: 99%

The Baltic Sea Experiment (BALTEX): A European Contribution to the Investigation of the Energy and Water Cycle over a Large Drainage Basin

Raschke¹,

Meywerk²,

Warrach³

et al. 2001

Bull. Amer. Meteor. Soc.

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The Baltic Sea Experiment (BALTEX) is one of the five continental-scale experiments of the Global Energy and Water Cycle Experiment (GEWEX). More than 50 research groups from 14 European countries are participating in this project to measure and model the energy and water cycle over the large drainage basin of the Baltic Sea in northern Europe. BALTEX aims to provide a better understanding of the processes of the climate system and to improve and to validate the water cycle in regional numerical models for weather forecasting and climate studies. A major effort is undertaken to couple interactively the atmosphere with the vegetated continental surfaces and the Baltic Sea including its sea ice. The intensive observational and modeling phase BRIDGE, which is a contribution to the Coordinated Enhanced Observing Period of GEWEX, will provide enhanced datasets for the period October 1999-February 2002 to validate numerical models and satellite products. Major achievements have been obtained in an improved understanding of related exchange processes. For the first time an interactive atmosphere-ocean-land surface model for the Baltic Sea was tested. This paper reports on major activities and some results.

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“…3. To assimilate GPS ZTD or PW in Numerical Weather Prediction Models (NWPM) (JOHNSEN and ROCKEL, 2001;GUSTAFSSON, 2002;TOMASINI et al, 2002;HAASE et al, 2003;GUEROVA et al, 2004;VEDEL et al, 2004;FACCANI et al, 2005;POLI et al, 2007). Water vapor and liquid content in the troposphere are one of the most important variables to assimilated in the NWPM to obtain accurate estimations of precipitation, vertical profiles of dew temperature, clouds and fogs.…”

Section: Introductionmentioning

confidence: 99%

“…This is because many weather processes are associated with changes in the content of atmospheric water vapor, which is the origin of ZWD variations (JOHNSEN and ROCKEL, 2001;BOCCOLARI et al, 2002;CHAMPOLLION et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

GPS Monitoring of the Tropical Storm Delta along the Canary Islands Track, November 28-29, 2005

Seco

González²,

Ramírez

et al. 2009

Pure appl. geophys.

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In this article we analyze the variations of the Zenith Tropospheric Delay (ZTD) and its components, Zenith Hydrostatic Delay (ZHD) and Zenith Wet Delay (ZWD) recorded by the GPS reference stations in the area of the Canary Islands during the passing of the tropical storm Delta on November 28 and 29, 2005. During this event, we observed that all GPS stations experienced significant increases of the ZWD value of over 100 mm and a decrease in the ZHD values of about 30 mm. The increase of the normal ZWD values was detected several hours prior to the manifestation of the weather phenomena on the ground. We also noticed a connection between the maximum ZWD values observed and the temporal distribution of the rain. The observed variations of the tropospheric slant directional gradients correlate significantly with the variations in direction and intensity of the observed winds. The relation noted between the ZWD values and the tropospheric slant delay gradients with meteorological observables highlights the convenience of using existing or new GPS networks when studying weather phenomena such as severe cyclones.

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Validation of a regional weather forecast model with GPS data

Cited by 6 publications

References 15 publications

Precipitable Water Content Climatology over Poland

Precipitable Water Content Climatology over Poland

The Baltic Sea Experiment (BALTEX): A European Contribution to the Investigation of the Energy and Water Cycle over a Large Drainage Basin

GPS Monitoring of the Tropical Storm Delta along the Canary Islands Track, November 28-29, 2005

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