Aerosol characterization of Morocco with AERONET and intercomparison with satellite data: TOMS, MODIS and MISR.

被引:1
作者
Bounhir, A. [1 ,2 ]
Benkhaldoun, Z. [2 ]
Sarazin, M. [3 ]
机构
[1] Fac Sci & Tech, Dept Phys Appliquee, BP 549, Marrakech, Morocco
[2] Fac Sci Semlalia, LPHEA, Dept Phys, Marrakech, Morocco
[3] ESO, D-85748 Garching, Germany
来源
REMOTE SENSING OF CLOUDS AND THE ATMOSPHERE XII | 2007年 / 6745卷
关键词
aerosol; sky transparency; ELT; Morocco; AERONET; TOMS; MODIS; MISR;
D O I
10.1117/12.730818
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The aim of this paper is to characterize the aerosol loadings, their optical and microphysical properties over Morocco, by use of the AERONET network and satellite data. Three AERONET stations in Morocco; Saada, Ras_E1_Ain and Dakhla are considered in this work. The aerosol parameters studied are the aerosol optical thickness, the Angstrom parameter, the size distribution, the single scattering albedo and the refraction index. An inter-comparison with satellite data has been achieved. The most popular satellite products, TOMS (Earth Probe and OMI), MODIS and MISR have been considered. It comes out from this study that the mean aerosol optical thickness (550 nm) vary from 0.22 to 0.3, with a peak in summer time of 0.56 for Dakhla, 0.42 for Ras_E1_Ain and 0.35 for Saada. The Angstrom parameter mean is 0.6 for Dakhla and 0.75 for Saada and Ras_E1_Ain with a summer minimum of 0.32 for Dakhla and 0.55 for Saada and Ras_E1_Ain. The size distribution is bimodal with a predominance of the coarse mode except for Saada in winter and autumn. This region depicts desert dust predominant environment with a single scattering albedo varying from 0.72 to 0.96. Saada and Ras_E1_Ain being at 52 km apart, their coincident daily AOT correlate with a correlation coefficient; R=0.93. Concerning the correlation between satellite data and AERONET AOT, TOMS EP has a correlation coefficient of 0.53 for Saada (all data), 0.68 for Dakhla (all data). TOMS OMI correlation coefficient is 0.68 for Saada (all data) and 0.71 for Ras_E1_Ain (year 2006). MISR (level 3 data) correlation coefficient is 0.77 for Saada (all data) and 0.85 for Dakhla (all data). MODIS (level 3) correlation coefficient is 0.86 for Saada (all data) and 0.92 for Dakhla (all data). Level 2 MODIS correlation coefficient is 0.69 for Saada (year 2006), 0.86 for Ras_E1_Ain (year 2006) and 0.97 for Dakhla (year 2003).
引用
收藏
页数:13
相关论文
共 21 条
  • [1] Aerosol columnar characterization in Morocco: ELT prospect
    Bounhir, A.
    Benkhaldoun, Z.
    Mougenot, B.
    Sarazin, M.
    Siher, E.
    Masmoudi, L.
    [J]. NEW ASTRONOMY, 2008, 13 (01) : 41 - 52
  • [2] Single-scattering albedo of smoke retrieved from the sky radiance and solar transmittance measured from ground
    Dubovik, O
    Holben, BN
    Kaufman, YJ
    Yamasoe, M
    Smirnov, A
    Tanré, D
    Slutsker, I
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1998, 103 (D24) : 31903 - 31923
  • [3] Accuracy assessments of aerosol optical properties retrieved from Aerosol Robotic Network (AERONET) Sun and sky radiance measurements
    Dubovik, O
    Smirnov, A
    Holben, BN
    King, MD
    Kaufman, YJ
    Eck, TF
    Slutsker, I
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2000, 105 (D8) : 9791 - 9806
  • [4] A flexible inversion algorithm for retrieval of aerosol optical properties from Sun and sky radiance measurements
    Dubovik, O
    King, MD
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2000, 105 (D16) : 20673 - 20696
  • [5] Dubovik O, 2002, J ATMOS SCI, V59, P590, DOI 10.1175/1520-0469(2002)059<0590:VOAAOP>2.0.CO
  • [6] 2
  • [7] Non-spherical aerosol retrieval method employing light scattering by spheroids
    Dubovik, O
    Holben, BN
    Lapyonok, T
    Sinyuk, A
    Mishchenko, MI
    Yang, P
    Slutsker, I
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2002, 29 (10) : 54 - 1
  • [8] Global distribution of UV-absorbing aerosols from Nimbus 7/TOMS data
    Herman, JR
    Bhartia, PK
    Torres, O
    Hsu, C
    Seftor, C
    Celarier, E
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1997, 102 (D14) : 16911 - 16922
  • [9] AERONET - A federated instrument network and data archive for aerosol characterization
    Holben, BN
    Eck, TF
    Slutsker, I
    Tanre, D
    Buis, JP
    Setzer, A
    Vermote, E
    Reagan, JA
    Kaufman, YJ
    Nakajima, T
    Lavenu, F
    Jankowiak, I
    Smirnov, A
    [J]. REMOTE SENSING OF ENVIRONMENT, 1998, 66 (01) : 1 - 16
  • [10] Kaufman YJ, 2002, GEOPHYS RES LETT, V29, DOI [10.1029/2001GL014492, 10.1029/2001GL013580]