Equatorial enhancement of the nighttime OH mesospheric infrared airglow

Baker, Doran J.; Thurgood, Brandon; Harrison, W.; Mlynczak, Martin G.; Russell, James M.

doi:10.1088/0031-8949/75/5/004

Cited by 25 publications

(35 citation statements)

References 20 publications

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“…O2A emission temperature measurements at Alice Springs and Adelaide are presented in the lower two panels of Figure 1. Recall that O2A emissions originate from altitudes above the OH layer; the O2A emission peak is near 94 km, while the OH emissions originate near 87 km [ McDade , 1998; Baker et al , 2007]. In contrast to the lower‐altitude OH emission temperatures, there is little latitudinal variation of the O2A temperatures between sites.…”

Section: Data Presentation and Analysismentioning

confidence: 99%

A seasonal study of mesospheric temperatures and emission intensities at Adelaide and Alice Springs

et al. 2008

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[1] Aerospace imagers operating at Alice Springs (23°42 0 S, 133°530 E) and Adelaide (34°55 0 S, 138°36 0 E) have collected more than 4-year of OH and O 2 atmospheric emission data. Images taken over the course of each moonless night at 5-min intervals were used to determine OH Meinel (6, 2) and O 2 Atmospheric (0, 1) band emission intensities and temperatures, as well as atmospheric gravity wave parameters. The NCAR general circulation model TIME-GCM was run for years [2002][2003][2004][2005] for comparison with these data. The data presented here show the interannual variability of OH and O2A emissions at two sites, Alice Springs and Adelaide, over a 4-a period. It was found that the TIME-GCM successfully reproduces many observed features of the data, including equinoctial maxima associated with the diurnal tide, a 6-h phase shift between OH temperature and intensity maxima, and springtime OH intensity enhancements at Alice Springs. However, the model tends to underestimate the depth of the summertime temperature minimum at both sites, possibly due to inadequate specification of the seasonal variation of gravity waves in the model. The model does, however, successfully describe many of the mesospheric changes observed during the 2002 stratospheric warming event.

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Section: Data Presentation and Analysismentioning

confidence: 99%

A seasonal study of mesospheric temperatures and emission intensities at Adelaide and Alice Springs

et al. 2008

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“… Nominal peak emission heights are from Baker et al [] for OH, McDade [] for O 2 , and Scheer et al [] for OI.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations of the nighttime O(¹S) and OH (8‐3) airglow intensity at Adelaide, Australia

2014

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We analyze 15 years of atomic oxygen (OI) 558 nm and hydroxyl (OH) (8-3) 730 nm nightglow emission intensities from heights near 96 and 87 km, respectively, measured using filter photometers at the Buckland Park Field Station (34.6°S, 138.6°E) near Adelaide, Australia. The intensity of both emissions exhibits clear seasonal and interannual periodicities, with annual, semiannual, and quasi-biennial oscillations, as well as a solar cycle influence. In addition, there is a terannual and 4.1 year component in the OI airglow intensity and both a quasi-biennial and quasi-triennial oscillation in the OH intensity. The results are in very good agreement with simultaneous collocated measurements made with an imager, and with global satellite climatologies of OI and OH intensities reported for the Wind Imaging Interferometer instrument. The mean value of the OI annual oscillation intensity is the same as that of the semiannual oscillation at this location to within the experimental uncertainty. The OI annual oscillation maximizes in summer, and the semiannual oscillation maximizes in autumn and spring, with the largest maximum in autumn. The terannual component in the OI nightglow maximizes in early summer, autumn, and spring. The quasi-biennial oscillation in the OI nightglow takes its first maximum value in autumn 1996, and the 4.1 year period in this emission first maximizes in summer 1998. The OH annual and semiannual oscillation intensities also agree to within the experimental uncertainties and are observed to peak in early winter. The quasi-biennial and quasi-triennial oscillations in this emission take their first maximum value in summer 1996.

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“…The weighing functions of two OH VER profiles are based on their corresponding emission peak and full width at half maximum (FWHM). Figures 3 and 4 while OH (5, 3) and (4, 2) band emissions are mainly collected at 1.6 µm (Baker et al, 2007). As OH emissions from different υ peak at different heights (von Savigny, 2015;Noll et al, 2016), the difference in OH 2.0 and 1.6 µm emission peaks is observed.…”

Section: Oh-equivalent Temperatures From Saber Kinetic Temperature Prmentioning

confidence: 86%

“…As hydroxyl emissions emanate from an extended altitude regime of ∼ 8-10 km width centred around 87 km (Baker et al, 2007;Nikoukar et al, 2007), an approach concerned with OH-equivalent temperature from the SABER kinetic temperature profiles was adopted by several investigators for fair comparison of ground-based and SABER measurements (Oberheide et al, 2006;López-González et al, 2007; Mulli- gan and Lowe, 2008;French and Mulligan, 2010). This concept is discussed in detail by French and Mulligan (2010).…”

Section: Oh-equivalent Temperatures From Saber Kinetic Temperature Prmentioning

confidence: 99%

A comparison of ground-based hydroxyl airglow temperatures with SABER/TIMED measurements over 23° N, India

2017

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Abstract. Ground-based observations of OH (6, 2) Meinel band nightglow were carried out at Ranchi (23.3 • N, 85.3 • E), India, during January-March 2011, December 2011-May 2012 and December 2012-March 2013 using an all-sky imaging system. Near the mesopause, OH temperatures were derived from the OH (6, 2) Meinel band intensity information. A limited comparison of OH temperatures (T OH ) with SABER/TIMED measurements in 30 cases was performed by defining almost coincident criterion of ±1.5 • latitude-longitude and ±3 min of the ground-based observations. Using SABER OH 1.6 and 2.0 µm volume emission rate profiles as the weighing function, two sets of OHequivalent temperature (T 1.6 and T 2.0 respectively) were estimated from its kinetic temperature profile for comparison with OH nightglow measurements. Overall, fair agreement existed between ground-based and SABER measurements in the majority of events within the limits of experimental errors. Overall, the mean value of OH-derived temperatures and SABER OH-equivalent temperatures were 197.3 ± 4.6, 192.0 ± 10.8 and 192.7 ± 10.3 K, and the ground-based temperatures were 4-5 K warmer than SABER values. A difference of 8 K or more is noted between two measurements when the peak of the OH emission layer lies in the vicinity of large temperature inversions. A comparison of OH temperatures derived using different sets of Einstein transition probabilities and SABER measurements was also performed; however, OH temperatures derived using Langhoff et al. (1986) transition probabilities were found to compare well.

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Equatorial enhancement of the nighttime OH mesospheric infrared airglow

Cited by 25 publications

References 20 publications

A seasonal study of mesospheric temperatures and emission intensities at Adelaide and Alice Springs

A seasonal study of mesospheric temperatures and emission intensities at Adelaide and Alice Springs

Seasonal variations of the nighttime O(¹S) and OH (8‐3) airglow intensity at Adelaide, Australia

A comparison of ground-based hydroxyl airglow temperatures with SABER/TIMED measurements over 23° N, India

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Equatorial enhancement of the nighttime OH mesospheric infrared airglow

Cited by 25 publications

References 20 publications

A seasonal study of mesospheric temperatures and emission intensities at Adelaide and Alice Springs

A seasonal study of mesospheric temperatures and emission intensities at Adelaide and Alice Springs

Seasonal variations of the nighttime O(1S) and OH (8‐3) airglow intensity at Adelaide, Australia

A comparison of ground-based hydroxyl airglow temperatures with SABER/TIMED measurements over 23° N, India

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Seasonal variations of the nighttime O(¹S) and OH (8‐3) airglow intensity at Adelaide, Australia

A comparison of ground-based hydroxyl airglow temperatures with SABER/TIMED measurements over 23° N, India