Estimation of SO{sub 2} dry deposition using turbulence parameters observed by sonic anemometer-thermometer

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:466240

Lee, Chong Bum; Kim, Yong Goog; Cho, Chang Rae ^[1]; Byun, D W ^[2]

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1. Kangwon National Univ. (Korea, Republic of)
2. National Oceanic and Atmospheric Administration, Research Triangle Park, NC (United States)

The dry deposition of pollutants can be calculated from the concentration of pollutants in the atmosphere and deposition velocity. To calculate deposition velocity, turbulence parameters such as friction velocity and Monin-Obukhov length are used. However, due to the difficulties in observation of turbulence parameters, usually mean values of wind speed and temperature observed using conventional meteorological instruments are used to estimate the dry deposition. The dry deposition velocity is the function of aerodynamic resistance (R{sub a}), sublayer resistance (R{sub b}), surface resistance (R{sub c}). R{sub a} and R{sub b} are calculated from turbulence parameters and R{sub c} is related to surface characteristics. The purpose of the present study is to compare the dry deposition obtained using the data sets of mean values and turbulence parameters measured by sonic anemometer-thermometer. The field observation was performed for 30 days from October 27 to November 25, 1995. The turbulence parameters were measured by 3 dimensional sonic anemometer-thermometer and mean meteorological variables are obtained at two heights, 2.5 m and 10 m. The results show that the dry deposition velocity is large, in daytime and small in nighttime. The major factor of diurnal variation is Ra. In the daytime the dry deposition velocity calculated using mean meteorological data show relatively similar to the dry deposition velocity calculated using the turbulence data, however there are big differences at night.

• OSTI ID: 466240
• Report Number(s): CONF-9606185--
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
DEPOSITION
EARTH ATMOSPHERE
ECOLOGICAL CONCENTRATION
EVALUATION
TURBULENCE
VELOCITY