Hydroxyl emission in the upper atmosphere

Krassovsky, V. I.

doi:10.1016/0032-0633(63)90002-3

Cited by 28 publications

(17 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The similarities between Xu et al [2012] model and our model stem from the fact that the Adler-Golden model is the basis for both. In contrast to Xu et al [2012] we take into account the secondary source of OH* (HO 2 + O → OH * + O 2 ) according to Krassovsky [1963], Schiff [1962], Nicolet [1970], Breig [1970], Nagy et al [1976], Takahashi and Batista [1981], Turnbull and Lowe [1983], and Sivjee and Hamwey [1987]. In fact, such approach does not contradict to the opinion of Llewellyn et al [1978] and McDade and Llewellyn [1987], who consider the contribution of this reaction is small.…”

Section: Comparison To Other Modelsmentioning

confidence: 99%

Hydroxyl layer: Mean state and trends at midlatitudes

et al. 2014

View full text Add to dashboard Cite

Based on an advanced model of excited hydroxyl relaxation we calculate trends of number densities and altitudes of the OH*-layer during the period 1961-2009. The OH*-model takes into account all major chemical processes such as the production by H + O 3 , deactivation by O, O 2 , and N 2 , spontaneous emission, and removal by chemical reactions. The OH*-model is coupled with a chemistry-transport model (CTM). The dynamical part (Leibniz Institute Model of the Atmosphere, LIMA) adapts ECMWF/ERA-40 data in the troposphere-stratosphere. The change of greenhouse gases (GHGs) such as CH 4 , CO 2 , O 3 , and N 2 O is parameterized in LIMA/CTM. The downward shift of the OH*-layer in geometrical altitudes occurs entirely due to shrinking (mainly in the mesosphere) as a result of cooling by increasing CO 2 concentrations. In order to identify the direct chemical effect of GHG changes on OH*-trends under variable solar cycle conditions, we consider three cases: (a) variable GHG and Lyman-α fluxes, (b) variable GHG and constant Lyman-α fluxes, and (c) constant GHG and Lyman-α. At midlatitudes, shrinking of the middle atmosphere descends the OH*-layer by~À300 m/decade in all seasons. The direct chemical impact of GHG emission lifts up the OH*-layer by~15-25 m/decade depending on season. Trends of the thermal and dynamical state within the layer lead to a trend of OH* height by~±100 m/decade, depending on latitude and season. Trends in layer altitudes lead to differences between temperature trends within the layer, at constant pressure, and at constant altitude, respectively, of typically 0.5 to 1 K/decade.

show abstract

Section: Comparison To Other Modelsmentioning

confidence: 99%

Hydroxyl layer: Mean state and trends at midlatitudes

et al. 2014

View full text Add to dashboard Cite

show abstract

“…the airglow emission. It was Krassovsky (1972) who introduced a quantity η (for hydroxyl emission) to characterize the wave-induced perturbations as a ratio of normalized intensity perturbations to the associated normalized temperature perturbations. This quantity was initially defined as a real quantity, but subsequent model studies have redefined it as a complex quantity, given as η = |η|e iϕ .…”

Section: Introductionmentioning

confidence: 99%

Summer-time nocturnal wave characteristics in mesospheric OH and O2 airglow emissions

2008

View full text Add to dashboard Cite

The mesospheric temperature mapper (MTM) measurements on mesospheric OH (6, 2) and O 2 (0, 1) band emissions from Maui, Hawaii during July, 2002 show significant day-to-day variability. The nocturnal variability reveals prominent wave signatures with a periodicity ranging from 6 to 13 h. For better characterization of the nocturnal wave in the data, a Krassovsky's η (∼|η|e iϕ ) analysis was carried out. Deduced Krassovsky parameters show significant variability, with ranges of |η| ∼ 1.7-3.9 for the OH data and ∼4.3-13 for the O 2 data. The phase values of Krassovsky parameters exhibit larger variability, with variations from approximately −91• to +23• for the OH data and −45• to −10 • for the O 2 data. Comparison of these values with existing observations and models show large deviations from model values and relatively better agreements with the observed values reported by other investigators. The deduced vertical wavelength from |η| and ϕ indicates that our data is mostly dominated by upward propagating waves with occasional high values ≥100 km, implying possible evanescent waves.

show abstract

“…In November 1952, at 76øN Our present temperatures north of 70 ø are thus 100øK or lower than those reported earlier, but until the results of further flights become available we do not comment more on this point. It is known, particularly from Russian work [Krassovsky, 1963], that a wide variation, together with a seasonal change, is sometimes found for OH temperatures even between 60øN and 70øN. We only note that our meas- 55øN to 62øN and is roughly centered on the latitude of Churchill.…”

Section: •)Iscussionmentioning

confidence: 63%

The latitude dependence of OH rotational temperature in the night airglow

Noxon¹

1964

J. Geophys. Res.

View full text Add to dashboard Cite

Rotational temperatures of OI-I in the night airglow have been measured over the latitude range from 55øN to 85øN during a single night from a jet aircraft flying at 75øW longitude. In March 1963 the rotational temperature was found to decline with increasing latitude from about 200øK to about 160øK; the decline was less pronounced in March 1964. The zenith intensity also fell by nearly a factor of 2 from ~200 kR to ~130 kR between 55øN ,d SSøN in 1963; in 1964 the intensity remained more nearly constant at about 200 kR. Such a decrease in rotational temperature at high latitude is in marked contrast to the results of some earlier studies made from ground stations. The temperatures are compared at ~60øN with rocket measurements made at nearly the same time; the temperatures agree well in the region 80-90 km near the minimum in mesospheric temperature. The decline in rotational temperature at higher latitude is interpreted as indicating a corresponding, and possibly greater, decline in the mesospheric minimum temperature at the high latitudes. A measurement of lower accuracy near the equator (10øN to 20øN) in April 1964 revealed an intensity near 300 kR and a temperature of ~275øK. IN THE NIGHT AIRGLOW 4089

show abstract

Hydroxyl emission in the upper atmosphere

Cited by 28 publications

References 8 publications

Hydroxyl layer: Mean state and trends at midlatitudes

Hydroxyl layer: Mean state and trends at midlatitudes

Summer-time nocturnal wave characteristics in mesospheric OH and O2 airglow emissions

The latitude dependence of OH rotational temperature in the night airglow

Contact Info

Product

Resources

About