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OH in the tropical upper troposphere and its relationships to solar radiation...

The core information for this publication's citation.: 
Gao, R., K. Rosenlof, D. Fahey, P. Wennberg, E. Hintsa, and T. F. Hanisco (2014), OH in the tropical upper troposphere and its relationships to solar radiation and reactive nitrogen, J Atmos Chem, 71, 55-64.
Abstract: 

In situ measurements of [OH], [HO2] (square brackets denote species concentrations), and other chemical species were made in the tropical upper troposphere (TUT). [OH] showed a robust correlation with solar zenith angle. Beyond this dependence, however, [OH] did not correlate to its primary source, the product of [O3] and [H2O] ([O3]•[H2O]), or its sink [NOy]. This suggests that [OH] is heavily buffered in the TUT. One important exception to this result is found in regions with very low [O3], [NO], and [NOy]. Under these conditions, [OH] is highly suppressed, pointing to the critical role of NO in sustaining OH in the TUT and the possibility of low [OH] over the western Pacific warm pool due to strong marine convections bringing NO-poor air to the TUT. In contrast to [OH], [HOx] ([OH] + [HO2]) correlated reasonably well with [O3]•[H2O]/[NOy], suggesting that [O3]•[H2O] and [NOy] are the significant source and sink, respectively, of [HOx].

Research Program: 
Upper Atmosphere Research Program (UARP)
Mission: 
STRAT