Implications of Satellite OH Observations for Middle Atmospheric H ₂ O and Ozone

Abstract

difference, which is an order of magnitude greater than that predicted by K-V systematics. Thls unexpected 6% change is greater than the variations in K observed for the entlre compositional range of blg-Fe solid solution in many oxides and silicates (2).T h e observed dependence of K on Mg-

Variability of the nighttime OH layer and mesospheric ozone at high latitudes during northern winter: influence of meteorology

“…The HO x dilemma arises from previous observations of either OH or HO 2 alone which have shown poor agreement with standard chemistry (JPL recommended rates). Therefore, in order to reach better agreement, some modifications to the rate constants of HO x partitioning reactions were suggested (e.g., Clancy et al, 1994;Summers et al, 1997). Nowadays these problems seem to be resolved by recent studies based on Aura Microwave Limb Sounder…”

Dynamics Study of the OH + O2Branching Atmospheric Reaction. 4. Influence of Vibrational Relaxation in Collisions Involving Highly Excited Species

“…In fact, most attempts to explain the discrepancy between the upper atmospheric model predictions of ozone concentration and satellite observations, known as the "ozone deficit problem", [11][12][13][14] have employed equilibrium concentrations of different atmospheric constituents and/or equilibrium rate constants. [15][16][17][18][19][20][21] The poor success of such models in resolving the above-mentioned "ozone deficit" leads to the necessity of introducing new ozone sources based on vibrationally excited molecules. 5,10,[22][23][24] Following this idea, other sources of ozone, considering LTD conditions, have been suggested.…”

Implications of enhanced mesospheric water vapor observed by HALOE

“…The first is that the only global data set of stratospheric and mesospheric CH4 and HI20, that from HALOE, has been revised (the current version is V18) and, as we will show, now shows significant deviations from expected theoretical values of 79. The second development is that [Summers et al, 1997b] The new data raise the question whether the global measurements provided by HALOE could be used to constrain the magnitude of such a proposed source.…”