Ground-based observation of aerosol optical properties in Lanzhou, China.

Aerosol optical properties from August 2006 to July 2007 were obtained from ground-based and sky radiance measurements in Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL), China. High aerosol optical thickness (AOT) associated with low Angström exponent (alpha) was mainly observed in spring, which was consistent with the seasonal dust production from Hexi Corridor. The maximum monthly average value of AOT 0.56 occurred in March of 2007, which was two times larger than the minimum value of 0.28 in October of 2006. Approximately 60% of the AOT ranged between 0.3 and 0.5, and nearly 93% of alpha value varied from 0.1 to 0.8, which occurred in spring. The significant correlation between aerosol properties and water vapor content was not observed. The aerosol volume size distribution can be characterized by the bimodal logarithm normal structure: fine mode (r < 0.6 microm) and coarse mode (r > 0.6 microm). Aerosols in spring of SACOL were dominated by large particles with the volume concentration ratio of coarse to fine modes being 7.85. The average values of asymmetry factor (g) in the wavelength range 440-1020 nm were found to be 0.71, 0.67, 0.67 and 0.69 in spring, summer, autumn and winter, respectively.

[1]  XIAXiang-ao,et al.  Automatic and continuous measurement of aerosol properties in Dunhuang,China , 2004 .

[2]  T. Eck,et al.  An emerging ground-based aerosol climatology: Aerosol optical depth from AERONET , 2001 .

[3]  Akira Ono,et al.  Transport of Asian dust (KOSA) particles; importance of weak KOSA events on the geochemical cycle of soil particles , 1988 .

[4]  Larry L. Stowe,et al.  Characterization of tropospheric aerosols over the oceans with the NOAA advanced very high resolution radiometer optical thickness operational product , 1997 .

[5]  Dengrong Lu,et al.  Influence of sanddust activities in the Hexi Corridor on the PM10 concentration in Lanzhou and its assessment , 2006, SPIE Optics + Photonics.

[6]  Michael D. King,et al.  A flexible inversion algorithm for retrieval of aerosol optical properties from Sun and sky radiance measurements , 2000 .

[7]  Jianmin Chen,et al.  A comparison of dust properties between China continent and Korea, Japan in East Asia , 2006 .

[8]  Alexander Smirnov,et al.  Cloud-Screening and Quality Control Algorithms for the AERONET Database , 2000 .

[9]  W. Shi.  Influence of Sand-dust Storms Occurring over the Gansu Hexi District on the Air Pollution in Lanzhou City , 1999 .

[10]  Qiu Jinhuan,et al.  Variation characteristics of atmospheric aerosol optical depths and visibility in North China during 1980–1994 , 2000 .

[11]  A. Smirnov,et al.  AERONET-a federated instrument network and data archive for aerosol Characterization , 1998 .

[12]  J. Mao,et al.  Analysis of the aerosol extinction characteristics in different areas of China , 2002 .

[13]  M. Noguer,et al.  Climate change 2001: The scientific basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change , 2002 .

[14]  Richard Arimoto,et al.  Dust emission from Chinese desert sources linked to variations in atmospheric circulation , 1997 .

[15]  Young-Joon Kim,et al.  An overview of ACE‐Asia: Strategies for quantifying the relationships between Asian aerosols and their climatic impacts , 2003 .

[16]  A. Alcantara,et al.  Atmospheric aerosols during the 2003 heat wave in southeastern Spain I: Spectral optical depth , 2006 .

[17]  Wang Pu-cai,et al.  Aerosol properties in a Chinese semiarid region , 2004 .

[18]  Lei Zhang,et al.  An overview of the Semi-arid Climate and Environment Research Observatory over the Loess Plateau , 2008 .

[19]  Chen Chang-he.  Lanzhou Aerosol Optical Depth in Winter and Their Relation with Visibility , 2005 .

[20]  T. Eck,et al.  Variability of Absorption and Optical Properties of Key Aerosol Types Observed in Worldwide Locations , 2002 .

[21]  Zong-ci Zhao,et al.  Climate change 2001, the scientific basis, chap. 8: model evaluation. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change IPCC , 2001 .

[22]  G. G. Palancar,et al.  Using the optical properties of aerosols from the AERONET database to calculate surface solar UV-B irradiance in Córdoba, Argentina : Comparison with measurements , 2008 .