Dynamical Study For Aerosols Transportation For Selected Extreme Dust Storms Over Al Jazeera Region

Ali Jasim Mohammed; Jasim H. Khadum; Alaa M. Al-lami; Hasanain K.A. Al-Shamarti; Ali M. Al-Salihi1 M/ Al-Salihi

Article Details

Dynamical Study For Aerosols Transportation For Selected Extreme Dust Storms Over Al Jazeera Region

Authors:

Ali Jasim Mohammed | Jasim H. Khadum | Alaa M. Al-lami | Hasanain K.A. Al-Shamarti | Ali M. Al-Salihi1 M/ Al-Salihi

Publisher:

Iraqi Geologists Union (Union of Iraqi Geologists)

Journal:

The Iraqi Geological Journal Vol.55 Issue 2D, pp.181-194

Document Type:

Article

Publication Date:

10/2022

Document Language:

English

Document ID (Org No.):

2001836189

pISSN:

2663-8754

Keywords:

Abstract:

 The characteristics and classifications of aerosol properties in Iraq were studied in this paper. The 1°×1° grid of monthly aerosol optical depth and angstrom exponent data of the period 2005 to 2017 in Iraq is used from Terra of MODIS. Moreover, the 1°×1° grid of Aerosol Index is used and it is available from NASA's Data and Information Services Center for Earth Sciences (GESDISC). The backtrjectory for 12 dust extreme events over the Al-Jaziraregion was studied by using the Single-Particle Lagrangian Integrated Trajectory model (HySplit-4). The spatial-seasonal aerosol properties over Iraq were obtained from the EOS-Aura satellite by Ozone Monitoring Instrument. The high-high clusters of aerosol optical depth and Aerosol Index values which refer to high concentration have been found in western and southern Iraq however low-low clusters have been found in the winter season over the whole of Iraq. According to Angstrom Exponent, there are three kinds of aerosol modes: fine, mixture, and coarse. This classification shows the maximum area under fine aerosols mode has occurred in the winter with 13.6% whereas the spring season did not show any area with fine aerosols mode. Moreover, the coarse mode covers the maximum area during the summer season at 97.7% and the minimum area during the winter season at 77. 2%. To demonstrate the relationship between topography and aerosol characteristics, Aerosol Properties Index is used which shows the degree of aerosol coarseness in each pixel. Using Geographically Weighted Regression and Ordinary Least Squares, the Aerosol Properties Index geographical distribution is strongly influenced by topographic conditions. Where the maximum coefficient of determination has been observed in the spring (R2=0.91) from the Geographically Weighted Regression model, while Ordinary Least Squares show a lower coefficient of determination (R2=0.33), Geographically Weighted Regression in comparison to Ordinary Least Squares show a better coefficient of determination in all seasons. The back trajectory for extreme dust events shows that some sources of air masses and their path to the study area through two pressure levels (1000 mb, 850 mb) and the geographical desert in the area of the study are the main cause of dust storms in the study area.

Article Details

Dynamical Study For Aerosols Transportation For Selected Extreme Dust Storms Over Al Jazeera Region

Authors:

Ali Jasim Mohammed | Jasim H. Khadum | Alaa M. Al-lami | Hasanain K.A. Al-Shamarti | Ali M. Al-Salihi1 M/ Al-Salihi

Publisher:

Iraqi Geologists Union (Union of Iraqi Geologists)

Journal:

The Iraqi Geological Journal Vol.55 Issue 2D, pp.181-194

Document Type:

Article

Publication Date:

10/2022

Document Language:

English

Document ID (Org No.):

2001836189

pISSN:

2663-8754

Iraq

Dust

aerosol

HySplit

Back trajectory

desert

Issues

Article Details

Dynamical Study For Aerosols Transportation For Selected Extreme Dust Storms Over Al Jazeera Region

Authors: Ali Jasim Mohammed | Jasim H. Khadum | Alaa M. Al-lami | Hasanain K.A. Al-Shamarti | Ali M. Al-Salihi1 M/ Al-Salihi

Publisher: Iraqi Geologists Union (Union of Iraqi Geologists)

Journal: The Iraqi Geological Journal Vol.55 Issue 2D, pp.181-194

Document Type: Article

Publication Date: 10/2022

Document Language: English

Document ID (Org No.): 2001836189

pISSN: 2663-8754

Iraq

Dust

aerosol

HySplit

Back trajectory

desert

Issues

Authors:

Ali Jasim Mohammed | Jasim H. Khadum | Alaa M. Al-lami | Hasanain K.A. Al-Shamarti | Ali M. Al-Salihi1 M/ Al-Salihi

Publisher:

Iraqi Geologists Union (Union of Iraqi Geologists)

Journal:

The Iraqi Geological Journal Vol.55 Issue 2D, pp.181-194

Document Type:

Article

Publication Date:

10/2022

Document Language:

English

Document ID (Org No.):

2001836189

pISSN:

2663-8754