A case study for Saharan dust transport over Turkey via RegCM4.1 model

Tugba Agacayak*, Tayfun Kindap, Alper Unal, Luca Pozzoli, Marc Mallet, Fabien Solmon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

The purpose of this study is to investigate a dust transport episode using atmospheric 3D modeling, satellite data, and in-situ observations. 3D simulations have been used to determine the aerosol optical properties and direct radiative effects of dust particles. In this study, the number of daily exceedances due to dust transport is estimated and, performance of RegCM4.1 model tested quantitatively with the aid of AOD data from AERONET network and PM10 ground measurements. The impact of dust on radiation estimated by the model for the 4-day period. PM10 values for Istanbul for the period between 2004-2010, and Marmara and Aegean Region for March 2008 provided by the Turkish Ministry of Environment were used to select an important episode. Exceedance days were evaluated according to the BSC-DREAM8b model output. We have used the RegCM4.1 model to further investigate the Saharan dust transport in the selected episode 21-24 March 2008. First, observed daily mean PM10 concentrations reach up to 180μg/m3 in Marmara Region and 160μg/m3 in Aegean Region, respectively. According to the RegCM4.1 model outputs, station Erdemli presents the highest AOD on 23rd March 2008, around 1.2, which is found to be highest than AERONET observations (AOD of 0.7). In parallel, daily mean AOD in Marmara Region is around 1.0 on the same day. Corresponding simulated column burden is about 1000mg/m2 in Marmara Region and 750mg/m2 in Aegean Region, respectively. In terms of radiative effect, daily mean shortwave (all-sky) radiative effect at surface (ToA) is -62W/m2 (-29W/m2) in Marmara and -71W/m2 (-33W/m2) in Aegean Region, respectively. In parallel, longwave all-sky direct forcing at surface (ToA) is +7W/m2 and (+4W/m2) in Marmara, +11W/m2 (+4W/m2) in Aegean Region. •The RegCM4.1 model was used to investigate a mineral dust transport episode from Saharan Desert to Western Turkey.•The contribution of dust transport to observed PM10 concentrations in NW Turkey is investigated.•Simulated AOD are in the range of observed values at three AERONET stations in the region.

Original languageEnglish
Pages (from-to)392-403
Number of pages12
JournalAtmospheric Research
Volume153
DOIs
Publication statusPublished - 2015

Bibliographical note

Publisher Copyright:
© 2014 Elsevier B.V.

Funding

This study was done by the collaboration of ITU and LA in scope of ChArMEx Project. It was supported by TUBITAK 2214 Grant Program. The results for BSC-DREAM8b model managed by the Barcelona Supercomputer Center (BSC-CNS) were obtained from publicly available website of BSC and used qualitatively to identify the episode.

FundersFunder number
TUBITAK

    Keywords

    • Aerosol optical depth
    • Direct radiative forcing
    • Mineral dust
    • Particulate matter

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