We are grateful to the National Science Foundation for Grants ATM 8900058 (M.J.C) and ATM 8615163 (R.J.O), which supported this work
Journal of the Atmospheric Sciences
Air -- Pollution, Hydroxyl group -- Measurement
A direct intercomparison of near-surface tropospheric HO concentration measurements by two different techniques was made in October–November 1992 at a rural site near Pullman, Washington. The atmosphere at the site is believed to contain low levels of anthropogenic pollution. The instruments' inlets were located at the same height (3.5 m) above the ground and were separated by 10 m along a line normal to the prevailing wind. Readings of the FAGE3 and radiocarbon instruments showed a high correlation (r² = 0.74) despite HO concentrations that were frequently near the detection limit of the instruments. An unweighted least squares regression shows a slope significantly different from unity, indicating different calibration scales of the two instruments
M..J. Campbell, B.D. Hall, J.C. Sheppard, P.L. Utley, R.J. O'Brien, T.M. Hard and L.A. George, "Intercomparison of Local Hydroxyl Measurement by Radiocarbon FAGE Techniques", Journal of Atmospheric Sciences, 52, pp. 3421-3427, 1995.