Evidence for Substantial Variations of Atmospheric Hydroxyl Radicals in the Past Two Decades

By R. Prinn, J. Huang, R. Weiss, D. Cunnold, P. Fraser, P. Simmonds, A. Mcculloch, C. Harth, P. Salameh, S. O'Doherty and 3 more. Science, 2001

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Comparative inverse analysis of satellite (MOPITT) and aircraft (TRACE-P) observations to estimate Asian sources of carbon monoxide (2004, background): “Our global annual mean pressure-weighted OH concentration below 200 hPa is 1.00 106 cm 3, which can be compared to estimates of (0.94 ± 0.13) 106 cm 3 [Prinn et al., 2001] and 1.07 0.17+0.09 106 cm 3 [Krol et al., 1998] based on observations of methylchloroform.”
Attribution of the accelerating increase in atmospheric methane during 2010–2018 by inverse analysis of GOSAT observations (2020, background): “…methyl chloroform proxy infers τ of 11.2± 1.3 years (Prather et al., 2012) and an inter-hemispheric ratio in the range 0.85–0.98 (Montzka et al., 2000; Prinn et al., 2001; Krol and Lelieveld, 2003; Bousquet et al., 2005; Patra et al., 2014), while the ACCMIP model ensemble yields a τ of 9.7± 1.5…”
Nonlinearities, Feedbacks and Critical Thresholds within the Earth's Climate System (2004, background): “increase the lifetimes of the above greenhouse gases (Thompson and Cicerone, 1986; Prinn et al., 2001).”
History of chemically and radiatively important atmospheric gases from the Advanced Global Atmospheric Gases Experiment (AGAGE) (2018, methodology): “The use of CH3CCl3 for OH concentration and trend estimation has been extensive (Prinn et al., 1987, 1995, 2001, 2005; Spivakovsky et al., 2000; Montzka et al., 2000, 2011b; Krol and Lelieveld, 2003; Bousquet et al., 2005).”