Hydroxyl (6−2) airglow emission intensity ratios for rotational temperature determination

French, William J.; Burns, G. B.; Finlayson, Keith; Greet, P. A.; Lowe, R. P.; Williams, P.

doi:10.1007/s00585-000-1293-2

Cited by 36 publications

(39 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ground-based temperatures were 4-5 K higher than SABER values, similar to earlier reports (von Savigny et al, 2004;Oberheide et al, 2006;Scheer et al, 2006;López-González et al, 2007;Mulligan and Lowe, 2008). As T OH derived from Meinel band line intensities strongly depend on the choice of transition probabilities (French et al, 2000), T OH were also derived using the transition probabilities given by Mies (1974), Turnbull and Lowe (1989) and Goldman (1998); however, the mean difference between T OH and SABER measurements increased from 3 to 15 K with their use. The T OH derived using Mies (1974) and Goldman (1998) were in general 8-9 K warmer than SABER measurements.…”

Section: Resultsmentioning

confidence: 99%

“…Nightglow observations of OH Meinel band have been widely used to obtain the temperature information of the upper mesospheric region near 87 ± 4 km (Meriwether, 1975;Offermann and Gerndt, 1990;Scheer and Reisin, 1990;Takahashi et al, 1994;Greet et al, 1998;French et al, 2000;Bittner et al, 2002;Burns et al, 2003;Mukherjee and Parihar, 2004;Offermann et al, 2010;Parihar et al, 2013). Several space-borne instruments like the Microwave Limb Sounder (MLS) on the Aura satellite; Atmospheric Chemistry Experiment -Fourier Transform Spectrometer (ACE-FTS) on SciSat-1; Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) and SCIAMACHY (Scanning Imaging Absorption Spectrometer for Atmospheric Chartography) on Environmental Satellite (ENVISAT); Solar Occultation for Ice Experiment (SOFIE) on the AIM satellite; Optical, Spectroscopic, and Infrared Remote Imaging System (ORISIS) on the Odin satellite; the Cryogenic Infrared Spectrometers and Telescopes for the Atmosphere (CRISTA) satellite instrument, and Sounding of the Atmosphere by Broadband Emission of Radiation (SABER) on-board the TIMED mission satellite have also contributed immensely to our knowledge of the temperature field of the MLT region (von Savigny et al, 2004;Scheer et al, 2006;Xu et al, 2007;Mulligan and Lowe, 2008;French and Mulligan, 2010;Sheese et al, 2011;García-Comas et al, 2012, 2014and references cited therein).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

2017

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2017

View full text Add to dashboard Cite

show abstract

“…In addition to O 2 emissions in the atmospheric band, SATIs measure OH emissions from the v = 4 transition of the v = 6 vibrational level. The OH layer temperature, i.e., the temperature weighted with the OH relative intensity at the OH layer altitudes, is retrieved from the rotational structure of single measurements considering the relative emission of three pairs of Q-branch lines (K1, K2 and K3 transitions) under the assumption of rotational local thermodynamic equilibrium (LTE, which holds for low rotational levels) and assuming the French et al (2000) Einstein coefficients. Background emission is simultaneously determined and subtracted, and the total OH(6-2) band emission, SATI OH intensity hereafter, is derived after simulation assuming the rotational LTE of a scaled spectrum at the derived temperature.…”

Section: Sati-osnmentioning

confidence: 99%

Mesospheric OH layer altitude at midlatitudes: variability over the Sierra Nevada Observatory in Granada, Spain (37° N, 3° W)

García‐Comas¹,

López-González²,

González‐Galindo³

et al. 2017

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. The mesospheric OH layer varies on several timescales, primarily driven by variations in atomic oxygen, temperature, density and transport (advection). Vibrationally excited OH airglow intensity, rotational temperature and altitude are closely interrelated and thus accompany each other through these changes. A correct interpretation of the OH layer variability from airglow measurements requires the study of the three variables simultaneously. Ground-based instruments measure excited OH intensities and temperatures with high temporal resolution, but they do not generally observe altitude directly. Information on the layer height is crucial in order to identify the sources of its variability and the causes of discrepancies in measurements and models. We have used SABER space-based 2002-2015 data to infer an empirical function for predicting the altitude of the layer at midlatitudes from ground-based measurements of OH intensity and rotational temperature. In the course of the analysis, we found that the SABER altitude (weighted by the OH volume emission rate) at midlatitudes decreases at a rate of 40 m decade −1 , accompanying an increase of 0.7 % decade −1 in OH intensity and a decrease of 0.6 K decade −1 in OH equivalent temperature. SABER OH altitude barely changes with the solar cycle, whereas OH intensity and temperature vary by 7.8 % per 100 s.f.u. and 3.9 K per 100 s.f.u., respectively. For application of the empirical function to Sierra Nevada Observatory SATI data, we have calculated OH intensity and temperature SATI-to-SABER transfer functions, which point to relative instrumental drifts of −1.3 % yr −1 and 0.8 K yr −1 , respectively, and a temperature bias of 5.6 K. The SATI predicted altitude using the empirical function shows significant short-term variability caused by overlapping waves, which often produce changes of more than 3-4 km in a few hours, going along with 100 % and 40 K changes in intensity and temperature, respectively. SATI OH layer wave effects are smallest in summer and largest around New Year's Day. Moreover, those waves vary significantly from day to day. Our estimations suggest that peak-to-peak OH nocturnal variability, mainly due to wave variability, changes within 60 days at least 0.8 km for altitude in autumn, 45 % for intensity in early winter and 6 K for temperature in midwinter. Plausible upper limit ranges of those variabilities are 0.3-0.9 km, 40-55 % and 4-7 K, with the exact values depending on the season.

show abstract

“…This method has been used by many authors to calculate mesospheric temperatures (e.g. French et al, 2000;Phillips et al, 2004;Suzuki et al, 2010;Holmen et al, 2014a). In this study, we use the same nomenclature as Phillips et al (2004) to describe hydroxyl emissions, as detailed in Appendix A of that paper.…”

Section: Introductionmentioning

confidence: 99%

“…French et al (2000) and Holmen et al (2014a) measured the OH(6-2) band, Phillips et al (2004) compared OH(6-2) band observations with measurements from OH(8-3), and Suzuki et al (2010) made use of the OH(8-4) band. In this study, we use Hi-TIES, the High Throughput Imaging Echelle Spectrograph (Chakrabarti et al, 2001), part of the Spectrographic Imaging Facility (SIF), located at the Kjell Henriksen Observatory (KHO), Svalbard (78.148 • N, 16.043 • E), to record hydroxyl emission line intensities.…”

Section: Introductionmentioning

confidence: 99%

Effect of water vapour absorption on hydroxyl temperatures measured from Svalbard

2017

View full text Add to dashboard Cite

Abstract. We model absorption by atmospheric water vapour of hydroxyl airglow emission using the HIghresolution TRANsmission molecular absorption database (HITRAN2012). Transmission coefficients are provided as a function of water vapour column density for the strongest OH Meinel emission lines in the (8-3), (5-1), (9-4), (8-4), and (6-2) vibrational bands. These coefficients are used to determine precise OH(8-3) rotational temperatures from spectra measured by the High Throughput Imaging Echelle Spectrograph (HiTIES), installed at the Kjell Henriksen Observatory (KHO), Svalbard. The method described in this paper also allows us to estimate atmospheric water vapour content using the HiTIES instrument.

show abstract

Hydroxyl (6−2) airglow emission intensity ratios for rotational temperature determination

Cited by 36 publications

References 17 publications

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

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

Mesospheric OH layer altitude at midlatitudes: variability over the Sierra Nevada Observatory in Granada, Spain (37° N, 3° W)

Effect of water vapour absorption on hydroxyl temperatures measured from Svalbard

Contact Info

Product

Resources

About

Hydroxyl (6−2) airglow emission intensity ratios for rotational temperature determination

Cited by 36 publications

References 17 publications

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

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

Mesospheric OH layer altitude at midlatitudes: variability over the Sierra Nevada Observatory in Granada, Spain (37° N, 3° W)

Effect of water vapour absorption on hydroxyl temperatures measured from Svalbard

Contact Info

Product

Resources

About

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

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

Mesospheric OH layer altitude at midlatitudes: variability over the Sierra Nevada Observatory in Granada, Spain (37° N, 3° W)