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Working progress

Working progress. Li Du. JJA-aggregated over 2000 to 2005. JJA-aggregated over 2000 to 2005. DJF-aggregated over 2000 to 2005. ASOS vs AIRNOW comparison. Time period: 2010-05-01 to 2010-06-01 ASOS: 1-min resolution visibility data hourly average

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Working progress

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  1. Working progress Li Du

  2. JJA-aggregated over 2000 to 2005

  3. JJA-aggregated over 2000 to 2005

  4. DJF-aggregated over 2000 to 2005

  5. ASOS vs AIRNOW comparison • Time period: 2010-05-01 to 2010-06-01 • ASOS: 1-min resolution visibility data hourly average VS. AIRNOW: hourly PM2.5 data

  6. Adopted RH Correction Curve(To be validated for different locations/seasons) RH is calculated fromT – Temperature, deg C and D – Dewpoint, deg C RH = 100*((112-(0.1*T)+D)/(112+(0.9*T)))8 Correction factor: C=8E-08*RH^4-7E-06*RH^3+0.0003*RH^2-0.0032*RH+1.0046 Adopted from Evaluation of the Light Scattering Data from the ASOS Network(ppt) by Rudolf B Husar

  7. Selected sites: Orangeburg(33.46167-79.1419) from ASOS and Cape Romain (32.94167-79.6578) from AIRNOW Approximated 75 km apart

  8. What’s next…(tentative plan) • Humidity correction of GSOD as well as ASOS data sets through programming so that the corrected version could be viewed in the browser • Importing more ASOS data (for most sites there are only less than one year’s data) and make some comparisons between aggregated data

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