Kinetic parameters for OH nightglow modeling consistent with recent laboratory measurements

Adler‐Golden, Steven M.

doi:10.1029/97ja01622

Cited by 128 publications

(209 citation statements)

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“…Rate coefficients are scaled by a factor of 1.18 to account for MLT temperatures (Lacoursière et al, 2003;Thiebaud et al, 2010). Lastly, Reaction (R7) describes an alternative OH-O quenching mechanism which previous studies (López-Puertas et al, 2004;Adler-Golden, 1997) applied in their OH models, where atomic oxygen completely quenches (ν → ν = 0) OH(ν) upon collision. For this reaction, we took the vibrationally independent rate coefficient of 2.0 × 10 −10 cm 3 s −1 from Adler-Golden (1997).…”

Section: Collisional Rate Coefficientsmentioning

confidence: 99%

“…The reaction rate coefficients applied in this study for modeling OH(ν) relaxation transfer of OH(ν) vibrational energy to the CO 2 (ν 3 ) mode are displayed in Table 1. The total chemical production rate of OH(ν) in Reaction (R1) was taken from Sander et al (2011) and the associated branching ratios for ν were taken from Adler-Golden (1997). We treat Reaction (R2) both as a single (1Q, ν = 1) and multiquantum (MQ, ν = 2 or 3) quenching process.…”

Section: Collisional Rate Coefficientsmentioning

confidence: 99%

“…The rate coefficient for the reaction O( 1 D) + N 2 (0) (Reaction R5 in Table 1) was taken from Sander et al (2011) with accounting for the fact that 33 % of the electronic energy is transferred to N 2 (Slanger and Black, 1974) producing, on average, 2.2 N 2 vibrational quanta. For the reaction OH(ν ≤ 9) + O 2 (0) (Reaction R6 in Table 1), we consider single and multiquantum quenching, using rate coefficients with associated branching ratios taken from Tables 1 and 3 of Adler-Golden (1997), respectively. Rate coefficients are scaled by a factor of 1.18 to account for MLT temperatures (Lacoursière et al, 2003;Thiebaud et al, 2010).…”

Section: Collisional Rate Coefficientsmentioning

confidence: 99%

“…We treat Reaction (R2) both as a single (1Q, ν = 1) and multiquantum (MQ, ν = 2 or 3) quenching process. We use the rate coefficient of this reaction (with associated branching ratios) taken from Table 1 of Adler-Golden (1997) and multiplied it by a low temperature factor of 1.4 (Lacoursière et al, 2003) for MLT regions. The rate coefficient for Reaction (R3) was taken from Shved et al (1998).…”

Section: Collisional Rate Coefficientsmentioning

confidence: 99%

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Resolving the mesospheric nighttime 4.3 µm emission puzzle: comparison of the CO2(ν3) and OH(ν) emission models

et al. 2017

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Abstract. In the 1970s, the mechanism of vibrational energy transfer from chemically produced OH(ν) in the nighttime mesosphere to the CO 2 (ν 3 ) vibration, OH(ν) ⇒ N 2 (ν) ⇒ CO 2 (ν 3 ), was proposed. In later studies it was shown that this "direct" mechanism for simulated nighttime 4.3 µm emissions of the mesosphere is not sufficient to explain space observations. In order to better simulate these observations, an additional enhancement is needed that would be equivalent to the production of 2.8-3 N 2 (1) molecules instead of one N 2 (1) molecule in each quenching reaction of OH(ν) + N 2 (0). Recently a new "indirect" channel of the OH(ν) energy transfer to N 2 (ν) vibrations, OH(ν) ⇒ O( 1 D) ⇒ N 2 (ν), was suggested and then confirmed in a laboratory experiment, where its rate for OH(ν = 9) + O( 3 P) was measured. We studied in detail the impact of the "direct" and "indirect" mechanisms on CO 2 (ν 3 ) and OH(ν) vibrational level populations and emissions. We also compared our calculations with (a) the SABER/TIMED nighttime 4.3 µm CO 2 and OH 1.6 and 2.0 µm limb radiances of the mesosphere-lower thermosphere (MLT) and (b) with ground-and space-based observations of OH(ν) densities in the nighttime mesosphere. We found that the new "indirect" channel provides a strong enhancement of the 4.3 µm CO 2 emission, which is comparable to that obtained with the "direct" mechanism alone but assuming an efficiency that is 3 times higher. The model based on the "indirect" channel also produces OH(ν) density distributions which are in good agreement with both SABER limb OH emission observations and ground and space measurements. This is, however, not true for the model which relies on the "direct" mechanism alone. This discrepancy is caused by the lack of an efficient redistribution of the OH(ν) energy from higher vibrational levels emitting at 2.0 µm to lower levels emitting at 1.6 µm. In contrast, the new "indirect" mechanism efficiently removes at least five quanta in each OH(ν ≥ 5) + O( 3 P) collision and provides the OH(ν) distributions which agree with both SABER limb OH emission observations and ground-and space-based OH(ν) density measurements. This analysis suggests that the important mechanism of the OH(ν) vibrational energy relaxation in the nighttime MLT, which was missing in the emission models of this atmospheric layer, has been finally identified.

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Section: Collisional Rate Coefficientsmentioning

confidence: 99%

Section: Collisional Rate Coefficientsmentioning

confidence: 99%

Section: Collisional Rate Coefficientsmentioning

confidence: 99%

Section: Collisional Rate Coefficientsmentioning

confidence: 99%

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Resolving the mesospheric nighttime 4.3 µm emission puzzle: comparison of the CO2(ν3) and OH(ν) emission models

et al. 2017

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“…The OH * product is determined from the model H and O 3 profiles. The OH * (v = 9) nascent band fractional production (0.47) and the deactivation rates for O 2 , N 2 and O are from Adler-Golden (1997). OH * rotational line transition probabilities are from the tabulations by van der Loo andGroenenboom (2007, 2008).…”

Section: Msao -Model Versus Observationsmentioning

confidence: 99%

The roles of vertical advection and eddy diffusion in the equatorial mesospheric semi-annual oscillation (MSAO)

et al. 2013

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Observations of the mesospheric semi-annual oscillation (MSAO) in the equatorial region have been reported dating back several decades. Seasonal variations in both species densities and airglow emissions are well documented. The extensive observations available offer an excellent case study for comparison with model simulations. A broad range of MSAO measurements is summarised with emphasis on the 80–100 km region. The objective here is not to address directly the complicated driving forces of the MSAO, but rather to employ a combination of observations and model simulations to estimate the limits of some of the underlying dynamical processes. Photochemical model simulations are included for near-equinox and near-solstice conditions, the two times with notable differences in the observed MSAO parameters. Diurnal tides are incorporated in the model to facilitate comparisons of observations made at different local times. The roles of water vapour as the "driver" species and ozone as the "response" species are examined to test for consistency between the model results and observations. The simulations suggest the interactions between vertical eddy diffusion and background vertical advection play a significant role in the MSAO phenomenon. Further, the simulations imply there are rigid limits on vertical advection rates and eddy diffusion rates. For August at the Equator, 90 km altitude, the derived eddy diffusion rate is approximately 1 × 10⁶ cm² s⁻¹ and the vertical advection is upwards at 0.8 cm s⁻¹. For April the corresponding values are 4 × 10⁵ cm² s⁻¹ and 0.1 cm s⁻¹. These results from the current 1-D model simulations will need to be verified by a full 3-D simulation. Exactly how vertical advection and eddy diffusion are related to gravity wave momentum as discussed by Dunkerton (1982) three decades ago remains to be addressed

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On the relationship between atomic oxygen and vertical shifts between OH Meinel bands originating from different vibrational levels

Savigny

Lednyts'kyy

2013

Geophysical Research Letters

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[1] OH Meinel emissions from different vibrational levels are known to occur at slightly different altitudes in the terrestrial airglow. Earlier model studies suggested quenching by atomic oxygen to be a principal cause of these vertical shifts. Here we employ the tropical mesopause regioncharacterized by pronounced semiannual variations-as a natural laboratory to test the hypothesis that vertical shifts between different OH Meinel bands are a consequence of quenching by atomic oxygen. Nighttime satellite measurements of OH(3-1) and OH(6-2) volume emission rate profiles and atomic oxygen with Scanning Imaging Absorption Spectrometer for Atmospheric Chartography on Envisat are used for this purpose. Upper mesospheric atomic oxygen profiles are retrieved from measurements of the O( 1 S-1 D) green line emission. The results demonstrate that vertical shifts between the OH bands investigated are indeed correlated with the amount of atomic oxygen in the upper mesosphere, corroborating the hypothesis. Citation: von Savigny, C., and O. Lednyts'kyy (2013), On the relationship between atomic oxygen and vertical shifts between OH Meinel bands originating from different vibrational levels, Geophys. Res. Lett., 40,[5821][5822][5823][5824][5825]

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Kinetic parameters for OH nightglow modeling consistent with recent laboratory measurements

Cited by 128 publications

References 40 publications

Resolving the mesospheric nighttime 4.3 µm emission puzzle: comparison of the CO<sub>2</sub>(<i>ν</i><sub>3</sub>) and OH(<i>ν</i>) emission models

Resolving the mesospheric nighttime 4.3 µm emission puzzle: comparison of the CO<sub>2</sub>(<i>ν</i><sub>3</sub>) and OH(<i>ν</i>) emission models

The roles of vertical advection and eddy diffusion in the equatorial mesospheric semi-annual oscillation (MSAO)

On the relationship between atomic oxygen and vertical shifts between OH Meinel bands originating from different vibrational levels

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Kinetic parameters for OH nightglow modeling consistent with recent laboratory measurements

Cited by 128 publications

References 40 publications

Resolving the mesospheric nighttime 4.3 µm emission puzzle: comparison of the CO&lt;sub&gt;2&lt;/sub&gt;(&lt;i&gt;ν&lt;/i&gt;&lt;sub&gt;3&lt;/sub&gt;) and OH(&lt;i&gt;ν&lt;/i&gt;) emission models

Resolving the mesospheric nighttime 4.3 µm emission puzzle: comparison of the CO&lt;sub&gt;2&lt;/sub&gt;(&lt;i&gt;ν&lt;/i&gt;&lt;sub&gt;3&lt;/sub&gt;) and OH(&lt;i&gt;ν&lt;/i&gt;) emission models

The roles of vertical advection and eddy diffusion in the equatorial mesospheric semi-annual oscillation (MSAO)

On the relationship between atomic oxygen and vertical shifts between OH Meinel bands originating from different vibrational levels

Contact Info

Product

Resources

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Resolving the mesospheric nighttime 4.3 µm emission puzzle: comparison of the CO<sub>2</sub>(<i>ν</i><sub>3</sub>) and OH(<i>ν</i>) emission models

Resolving the mesospheric nighttime 4.3 µm emission puzzle: comparison of the CO<sub>2</sub>(<i>ν</i><sub>3</sub>) and OH(<i>ν</i>) emission models