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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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asos vs airnow comparison
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

adopted rh correction curve to be validated for different locations seasons
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

slide8

Selected sites:

Orangeburg(33.46167-79.1419) from ASOS and Cape Romain (32.94167-79.6578) from AIRNOW

Approximated 75 km apart

what s next tentative plan
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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