Three-Dimensional Variational Data Assimilation of Ground-Based GPS ZTD and Meteorological Observations during the 14 December 2001 Storm Event over the Western Mediterranean Sea

Cucurull, Lídia; Vandenberghe, François; Barker, Dale; Vilaclara, E.; Rius, A.

doi:10.1175/1520-0493(2004)132<0749:tvdaog>2.0.co;2

Cited by 60 publications

(59 citation statements)

References 23 publications

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“…In the case of events which are dominated by horizontal advection as in inflows of moist warm air in coastal regions (e.g. Cucurull et al, 2004), a simpler 2-D approach plus time as shown in Fig. 8, but with a good horizontal resolution and automatic post-processing possibly taking into account terrain effects (Van Baelen et al, 2011), would be relevant to provide support for weather nowcasting.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

On the inclusion of GPS precipitable water vapour in the nowcasting of rainfall

Benevides

Catalão

Miranda

2015

Nat. Hazards Earth Syst. Sci.

127

122

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Abstract. The temporal behaviour of precipitable water vapour (PWV) retrieved from GPS delay data is analysed in a number of case studies of intense precipitation in the Lisbon area, in the period 2010-2012 and in a continuous annual cycle of 2012 observations. Such behaviour is found to correlate positively with the probability of precipitation, especially in cases of severe rainfall. The evolution of the GPS PWV in a few stations is analysed by a least-squares fitting of a broken line tendency, made by a temporal sequence of ascents and descents over the data. It is found that most severe rainfall events occur in descending trends after a long ascending period and that the most intense events occur after steep ascents in PWV. A simple algorithm, forecasting rain in the 6 h after a steep ascent of the GPS PWV in a single station, is found to produce reasonable forecasts of the occurrence of precipitation in the nearby region, without significant misses in what concerns larger rain events, but with a substantial amount of false alarms. It is suggested that this method could be improved by the analysis of 2-D or 3-D time-varying GPS PWV fields or by its joint use with other meteorological data relevant to nowcast precipitation.

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Section: Discussionmentioning

confidence: 99%

“…Assimilation of GPS-derived water vapour data into weather forecast models has already been studied, resulting in better forecast of severe rain events (Vedel et al, 2004;Cucurull et al, 2004), even at the convective scale (Yan et …”

Section: Introductionmentioning

confidence: 99%

On the inclusion of GPS precipitable water vapour in the nowcasting of rainfall

Benevides

Catalão

Miranda

2015

Nat. Hazards Earth Syst. Sci.

127

122

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“…Recent work on the assimilation of high spatial and temporal resolution GPS ZTD observations into mesoscale NWP systems suggest that better results can be obtained by increasing the model resolution (Cucurull et al, 2004;Peng and Zou, 2004;. We have also conducted earlier research on assimilating GPS ZTD observations into the 9.5 km resolution ALADINFrance/3D-Var system and using its analyses as initial conditions for 2.5 km non-hydrostatic model MesoNH runs .…”

Section: Introductionmentioning

confidence: 99%

The benefit of GPS zenith delay assimilation to high‐resolution quantitative precipitation forecasts: a case‐study from COPS IOP 9

Yan

Ducrocq

Jaubert

et al. 2009

Quart J Royal Meteoro Soc

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ABSTRACT:The benefit of assimilating high spatial and temporal resolution Global Positioning System (GPS) zenith tropospheric delay (ZTD) observations within a high-resolution numerical weather prediction (NWP) system is evaluated during IOP 9 of the Convective and Orographically-induced Precipitation Study (COPS) campaign. In the framework of the international COPS field experiment, which took place from June to August 2007, a dense GPS network was deployed in the Vosges mountain region in eastern France and in the Black Forest region in southwestern Germany.GPS ZTD observations collected during the COPS field campaign, in addition to the European operational GPS data, are assimilated into the AROME/3D-Var system. We investigate the impact of assimilating these GPS ZTD observations on the forecast of convective systems that travelled over eastern France during the three days of COPS IOP 9 (18-20 July 2007). The results show a clear positive impact on short-range quantitative precipitation forecasts when GPS ZTD observations are assimilated. The impact is most important on 19 July 2007 (IOP 9b). The present study benefits from additional validation measurements collected during the COPS campaign. In particular we find that the assimilation of ZTD data induces changes in the low-to-middle tropospheric water vapour vertical structure that are consistent with water vapour measurements from radiosonde and airborne lidar.As most of the improvement is gained by assimilating GPS ZTD observations from the European operational GPS network, this study opens up encouraging horizons for the assimilation of GPS ZTD in new high-resolution operational NWP systems.

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“…Recently the scientific community put a lot of effort into improving the forecast using standard and new generation daily observations such as those from radar, satellite, the Windprofiler, the Special Sensor Microwave/Imager and using the Global Positioning System (Xiao et al 2000;De Pondeca and Zou 2001;Liu et al 2001;Cucurull et al 2004); the ad hoc technique is the Variational Assimilation (3D-Var or 4D-Var). Indeed, the variational technique allows all kinds of data to be assimilated, if they can be computed using the model variables.…”

Section: Introductionmentioning

confidence: 99%

Data assimilation of high-density observations. I: Impact on initial conditions for the MAP/SOP IOP2b

Faccani

Ferretti

2005

Q. J. R. Meteorol. Soc.

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SUMMARYAn attempt is made to evaluate the impact of the data assimilation of high-frequency data on the initial conditions. The data assimilation of all the data available on the Mesoscale Alpine Program archive for a test case is performed using the objective analysis and the Variational Data Assimilation (Var) techniques. The objective analysis is performed using two different schemes: Cressman and multiquadric; 3D-Var is used for the variational analysis. The European Centre for Medium-Range Weather Forecasts analyses are used as first guess, and they are blended together with the observations to generate an improved set of mesoscale initial and boundary conditions for the Intensive Observing Period 2b (17-21 September 1999). A few experiments are performed using the initialization procedure of MM5, the mesoscale model from Penn State University/National Center for Atmospheric Research. The comparison between improved initial conditions and observations shows: (i) the assimilation of the surface and upper-air data has a large positive impact on the initial conditions depending on the technique used for the objective analysis; (ii) a large decrease of the error for the meridional component of the wind V at the initial time is found, if assimilation of three-hourly data is performed by objective analysis; (iii) a comparable improvement of the initial conditions with respect to the objective analysis is found if 3D-Var is used, but a large error is obtained for the V component of the wind.

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Three-Dimensional Variational Data Assimilation of Ground-Based GPS ZTD and Meteorological Observations during the 14 December 2001 Storm Event over the Western Mediterranean Sea

Cited by 60 publications

References 23 publications

On the inclusion of GPS precipitable water vapour in the nowcasting of rainfall

On the inclusion of GPS precipitable water vapour in the nowcasting of rainfall

The benefit of GPS zenith delay assimilation to high‐resolution quantitative precipitation forecasts: a case‐study from COPS IOP 9

Data assimilation of high-density observations. I: Impact on initial conditions for the MAP/SOP IOP2b

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