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Conference: Bucharest University Faculty of Physics 2015 Meeting

Section: Atmosphere and Earth Science; Environment Protection

Title:

Laser and Optical Remote-sensing of atmospheric LAYers (LORELAY) campaign, during autumn season

Authors:

Adrian TIMOFTE(1,2), Marius Mihai CAZACU(1,3), Livio BELEGANTE(4), Horațiu ȘTEFĂNIE(4,5,6), Cristian RADU(4), Bogdan ALBINA(1), Silviu GURLUI(1)

Affiliation:

(1)“Alexandru Ioan Cuza” University of Iasi, Faculty of Physics, Bulevardul Carol I, nr. 11, 700506 Iasi, Romania, Atmosphere Optics, Spectroscopy and Lasers Laboratory (LOA-SL Iasi)

(2)National Meteorological Administration, Regional Forecast Center Bacau, 3 Timpului Str., Bacau, Romania

(3)Physics Department, Gheorghe Asachi Technical University of Iasi, 59A Mangeron Blvd., 700050 Iasi, Romania

(4)National Institute of R&D for Optoelectronics, 409 Atomistilor Street, Magurele, IlfovPO Box MG-5,

RO-77125 Romania

(5)”Babeș-Bolyai” University of Cluj-Napoca, Faculty of Environmental Science and Engineering, 400294, Cluj-Napoca, Romania

(6)University of Bucharest, Faculty of Physics, P.O.BOX MG-11, Magurele, Bucharest, Romania

E-mail

cazacumarius@gmail.com

Keywords:

PBL, ALARO, LIDAR

Abstract:

Studies of the Planetary Boundary Layer (PBL) height are of great interest since the PBL acts as the interface with the Earth surface and most of the atmospheric phenomena occur in this region (Stull, R.B., 1988). The way this information can be obtained on a daily basis for an extended region is given by PBL forecast, obtained by integrating numerical models. The meteorological parameters retrieved from the integration of such models, represents the basis of operational meteorological activity. In order to validate the numerical forecast of PBL, observation data obtained from LIDAR measurements are used.An extended measurement campaign aiming the monitoring of lower tropospheric layers was deployed between October 25th and November 3rd 2014. The lidar measurements performed during the campaign were focused on Iasi-LOASL monitoring site. The analysis is focused on the direct comparison between the lidar PBL height (defined in respect to the aerosol load) and the height forecasted by the ALARO model in order to validate the numerical weather forecast.The ALARO model has been developed as a version of the limited area ARPEGE / ALADIN and it is operationally integrated within the National Meteorology Administration having a 6.5 km horizontal resolution and 60 vertical levels. The last operational version of the model, implemented in January 2014, includes a number of improvements related to physical parameterizations of wet processes (Gerard et al., 2009). ALARO model is integrated four times a day. For this campaign, only the integration from 00 UTC was used. The encouraging results obtained from the validation given by the PBL forecast availed by the fine resolution model ALARO, have led us to perform comparisons between meteorological parameters (temperature, pressure, wind speed and relative humidity) measured at the County Weather Station Iasi to the one forecasted by the ALARO model.

References:

Gerard, L., Piriou, J.-M., Brozkova, R., Geleyn, J.-F., and Banciu, D. (2009): Cloud and precipitation parametrization in a meso-gamma-scale operational wheather prediction model, MWR , 137

Stull, R.B., An introduction to boundary layer meteorology, Kluwer Academic Publishers, Dordrecht, 1988

Zagăr L., Contribuţii la studiul integrat al poluarii aerului din Stratul Limită Planetar, Summary of the doctoral thesis, Bucharest, 2011

Acknowledgement:

This work was supported by the strategic grant POSDRU/159/1.5/S/137750, Project “Doctoral and Postdoctoral programs support for increased competitiveness in Exact Sciences research” cofinanced by the European Social Found within the Sectorial Operational Program Human Resources Development 2007 – 2013, and by the Romanian Space Agency (ROSA) within Space Technology and Advanced Research (STAR) Program (Project nr. 98/29.11.2013). Special thanks to ALADIN group from National Meteorological Administration.