Use of potential vorticity fields, Meteosat water vapour imagery and pseudo water vapour images for evaluating numerical model behaviour

Georgiev, Christo G.; Martín, Francisco

doi:10.1017/s1350482701001050

Cited by 12 publications

(8 citation statements)

References 12 publications

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“…Georgiev, 1999;Lagouvardos and Kotroni, 2000;Georgiev and Martín, 2001). While Georgiev (1999) tried to quantify the relationship between METEOSAT WV data and positive PV anomalies (he found a correlation coefficient ranging between 0.58 and 0.64 considering 500 hPa PV analyses for two cases of cyclones), Georgiev and Martín (2001) used the PV-WV link as a diagnostic tool to validate numerical outputs. Nevertheless, none of these studies used PV inversion methods to correct numerical PV fields in the case of a mismatch with satellite data.…”

Section: Introductionmentioning

confidence: 99%

Improving the numerical prediction of a cyclone in the Mediterranean by local potential vorticity modifications

Argence

Lambert

Richard

et al. 2009

Quart J Royal Meteoro Soc

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This study explores the benefit that can be drawn from incorporating local potential vorticity (PV) modifications into a numerical forecast. The case under study is the severe cyclogenesis that occurred in the Western Mediterranean from 9 to 12 November 2001. This case was shown to be extremely sensitive to the upper-level flow, which governed to a great extent the deepening of the depression and the location and intensity of its associated precipitation. Corrections of PV were guided by METEOSAT-7 water vapour observations and restricted to the upper troposphere, mainly altering the topography of the dynamical tropopause. Using both the French operational global model ARPEGE and the non-hydrostatic mesoscale model Meso-NH, it is shown that carefully designed PV corrections lead to a substantial improvement in the simulation of the storm, both in terms of surface pressure, cloud cover and precipitation forecasts. Furthermore, the impact of the modifications is shown to be a maximum when they are introduced at the time corresponding to the incipient stage of cyclogenesis.

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Section: Introductionmentioning

confidence: 99%

Improving the numerical prediction of a cyclone in the Mediterranean by local potential vorticity modifications

Argence

Lambert

Richard

et al. 2009

Quart J Royal Meteoro Soc

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show abstract

“…Furthermore, experience shows that water vapor (WV) channel images can serve operational forecasters as a valuable tool for monitoring upper-level dynamics. Indeed, forecasters detect failures in a model analysis by comparing the imagery information with NWP model output [15]. In particular, PV anomalies and areas of vertical motion that are involved in cyclogenesis are conspicuous as relatively warm features on the images, as shown by radiance temperature.…”

Section: Analysis and Free Run Comparison With Independent Observationsmentioning

confidence: 99%

Dynamical contribution of mean potential vorticity pseudo-observations derived from MetOp/GOME2 ozone data into short-range weather forecast during high precipitation events

Sbii

Zazoui

Semane

2015

IJBAS

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Satellites are uniquely capable of providing uniform data coverage globally. Motivated by such capability, this study builds on a previously described methodology that generates numerical weather prediction initial conditions from satellite total column ozone data. The methodology is based on two principal steps. Firstly, the studied linear regression between vertical (100hPa-500hPa) Mean Potential Vorticity (MPV) and MetOp/GOME2 total ozone data (O3) generates MPV pseudo-observations. Secondly, the 3D variational (3D-Var) assimilation method is designed to take into account MPV pseudo-observations in addition to conventional observations. After a successful assimilation of MPV pseudo-observations using a 3D-Var approach within the Moroccan version of the ALADIN limited-area model, the present study aims to assess the dynamical behavior of the short-range forecast at upper levels during heavy precipitation events (HPEs). It is found that MPV assimilation offers the possibility to internally monitor the model upper-level dynamics in addition to the use of Water Vapor Satellite images.

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“…The frontal cloud band is clearly visible, as is the dry area immediately to its west and south associated with upper-level descent. The pseudo-WV image provides a method of quickly assessing whether the model has resolved essential features of the atmospheric development, by comparison with actual WV imagery (see, e.g., Georgiev and Martin 2001). In this case, the correspondence between the two images of the frontal band, the tropopause descent near the trough axis and broad descent over the Great Australian Bight, suggest that key aspects of the dynamics have been captured by mesoLAPS.…”

Section: F Mesoscale Featuresmentioning

confidence: 99%

Springtime Fire Weather in Tasmania, Australia: Two Case Studies

Fox‐Hughes

2012

Weather and Forecasting

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A number of severe springtime fire weather events have occurred in Tasmania, Australia, in recent years. Two such events are examined here in some detail, in an attempt to understand the mechanisms involved in the events. Both events exhibit strong winds and very low surface dewpoint temperatures. Associated 850-hPa wind-dewpoint depression conditions are extreme in both cases, and evaluation of these quantities against a scale of past occurrences may provide a useful early indicator of future severe events. Both events also feature the advection of air from drought-affected continental Australia ahead of cold fronts. This air reaches the surface in the lee of Tasmanian topography by the action of the fö ehn effect. In one event, there is good evidence of an intrusion of stratospheric, high potential vorticity (PV), air, supplementing the above mechanism and causing an additional peak in airmass dryness and wind speed.

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Use of potential vorticity fields, Meteosat water vapour imagery and pseudo water vapour images for evaluating numerical model behaviour

Cited by 12 publications

References 12 publications

Improving the numerical prediction of a cyclone in the Mediterranean by local potential vorticity modifications

Improving the numerical prediction of a cyclone in the Mediterranean by local potential vorticity modifications

Dynamical contribution of mean potential vorticity pseudo-observations derived from MetOp/GOME2 ozone data into short-range weather forecast during high precipitation events

Springtime Fire Weather in Tasmania, Australia: Two Case Studies

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