Title of article :
Optical properties of Aeolian dusts common to West Texas
Author/Authors :
Ma، نويسنده , , Lulu and Zobeck، نويسنده , , Ted M. and Hsieh، نويسنده , , Daniel H. and Holder، نويسنده , , Dean and Morgan، نويسنده , , Cristine L.S. and Thompson، نويسنده , , Jonathan E.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Abstract :
Both recent models and historical events such as the Dust Bowl and volcanic eruptions have illustrated aerosols can play a significant role in climate change through direct and indirect optical effects. Soil dust aerosols generated by Aeolian processes represent a significant fraction of the total mass burden of atmospheric particles. Central to a better understanding of the climate effects of dust aerosols is knowledge of their optical properties. This research study utilized a dust generator and several instruments to determine certain optical properties of Aeolian dust mimics created by the Amarillo and Pullman soil types native to the panhandle of Texas, USA. Values for the mass-extinction coefficient ranged between 1.74 and 2.97 m2 g−1 at 522 nm depending on how mass concentration was determined. Single-scatter albedo (SSA) for both soil types ranged from 0.947 to 0.980 at visible wavelengths with SSA increasing at longer wavelengths. Angstrom absorption exponents were measured as 1.73 for Pullman and 2.17 for Amarillo soil. Observed Angstrom extinction exponents were 0.110 and 0.168 for the Pullman and Amarillo soil types. The optical properties reported may be of use for optical based estimates of soil erosion and aid in understanding how regional soil dusts may alter radiative transport presently and during historical events such as the Dust Bowl era.
Keywords :
Angstrom exponent , Angstrom absorption exponent , Mass extinction efficiency , dust , Optical properties , Albedo
Journal title :
Aeolian Research
Journal title :
Aeolian Research