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AATS-14 measurements during COAST. J. Livingston R. Johnson M. Kacenelenbogen C. Chang P. Russell. Data acquisition and analysis. 14 data channels centered at wavelengths ( l) 354 – 2139 nm Data sampled at 10 Hz and averaged over 2 sec during flights

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aats 14 measurements during coast

AATS-14 measurements during COAST

J. Livingston

R. Johnson

M. Kacenelenbogen

C. Chang

P. Russell

data acquisition and analysis
Data acquisition and analysis
  • 14 data channels centered at wavelengths (l) 354 – 2139 nm
  • Data sampled at 10 Hz and averaged over 2 sec during flights
  • 2-sec voltage means and stds written to raw data file
  • September MLO sunrise calibration results used to calculate aerosol optical depth (AOD) at 13 l (using OMI columnar ozone data) and columnar water vapor (CWV) at 941 nm
  • AODs at 12 l, CWVs, estimated uncertainties archived with a/c latitude, longitude, GPS and P altitudes, static P, and spectral AOD fitting parameters in modified Gaines-Hipskind formatted files for 10/26, 10/27, and 10/28 flights
system performance issues
System performance issues
  • Tracking changes caused by reflection off wing during aircraft turns
  • Reflection of the sun off the higher wing occasionally led to a small deviation in AATS-14 tracking that yielded slightly elevated or depressed signals in some science channels.
  • These reflections occurred when the relative azimuth of the AATS-to-sun vector coincided with the azimuth of the vector defined by the Twin Otter fuselage/higher wing intersection and the higher wing tip.
  • All affected data have NOT been removed from the archived files.
  • Computer clock timing uncertainties
  • Twin Otter computer, AATS can computer, AATS laptop
  • Anomalously high AODs in 1558-nm channel
  • These were observed during the MLO calibration and during COAST flights. The source of this problem may have been a light leak in the 1558-nm filter. AODs in this channel have been excluded from the archived files.
system performance issues1
System performance issues
  • Tracking changes caused by reflection off wing during aircraft turns
  • Reflection of the sun off the higher wing occasionally led to a small deviation in AATS-14 tracking that yielded slightly elevated or depressed signals in some science channels.
  • These reflections occurred when the relative azimuth of the AATS-to-sun vector coincided with the azimuth of the vector defined by the Twin Otter fuselage/higher wing intersection and the higher wing tip.
  • All affected data have NOT been removed from the archived files.
  • Computer clock timing uncertainties
  • Twin Otter computer, AATS can computer, AATS laptop
  • Anomalously high AODs in 1558-nm channel
  • These were observed during the MLO calibration and during COAST flights. The source of this problem may have been a light leak in the 1558-nm filter. AODs in this channel have been excluded from the archived files.
slide9

Bottom altitude

late

early

Top altitude

slide12

Comparison of AOD spectra on 10/26 and 10/28

Bottom altitude

Top altitude

late

early

slide13

26 Oct

Columnar water vapor increased

with time

28 Oct

Columnar water vapor decreased with time

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