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Proceedings Paper

Tunable-diode-laser absorption measurements of H2O2 and HCHO during the Mauna Loa observatory photochemistry experiment.
Author(s): Gervase I. Mackay; David R. Karecki; Harold I. Schiff
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Paper Abstract

The tunable diode laser absorption spectrometric technique was employed to measure H2O2 and HCHO during the Mauna Loa Observatory Photochemistry Experiment II fall and winter intensives. Comparisons were made between the measurements made with the TDLAS technique and several other methods. The half-hourly average mixing ratios varies between 1300 pptv and the instrument detection limit of 50 - 100 pptv for H2O2 and between 400 pptv and the instrument detection limit approximately 25 pptv for HCHO. Daily average mixing ratios for H2O2 were 550 +/- 79 pptv (fall) and 540 +/- 80 pptv (winter), and for HCHO were 130 +/- 21 pptv (fall) and 200 +/- 35 (winter). HCHO showed strong diurnal behavior with maxima in the 12:00 - 17:00 time period whereas H2O2 showed essentially no diurnal variation. Clean tropospheric air sampled during downslope conditions between 20:00 and 06:00 had HCHO mixing ratios averaging 80 pptv in the fall and 160 pptv in the winter. These values are considerably lower than model predictions.

Paper Details

Date Published: 12 February 1993
PDF: 12 pages
Proc. SPIE 1715, Optical Methods in Atmospheric Chemistry, (12 February 1993); doi: 10.1117/12.140178
Show Author Affiliations
Gervase I. Mackay, Unisearch Associates Inc. (Canada)
David R. Karecki, Unisearch Associates Inc. (Canada)
Harold I. Schiff, Unisearch Associates Inc. (Canada)

Published in SPIE Proceedings Vol. 1715:
Optical Methods in Atmospheric Chemistry
Harold I. Schiff; Ulrich Platt, Editor(s)

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