Calculation of infrared limb emission by ozone in the terrestrial middle atmosphere. 1. Source functions

Journal Article · Thu Sep 20 04:00:00 EDT 1990 · Journal of Geophysical Research; (USA)

DOI:https://doi.org/10.1029/JD095iD10p16497· OSTI ID:5938072

Milynczak, M G ^[1]; Drayson, S R ^[2]

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1. NASA Langley Research Center, Hampton, VA (USA)
2. Univ. of Michigan, Ann Arbor (USA)

Two statistical equilibrium models are compared to analyze the departure from local thermodynamic equilibrium (LTE) in the vibration-rotation bands of ozone in the middle atmosphere. The bands that emit in the 9-11 {mu}m spectral interval depart from LTE due to chemical pumping, spontaneous emission, radiative absorption, and photochemical reaction. The diurnal variation in the {nu}{sub 1} and {nu}{sub 3} fundamental band source functions is determined by the diurnal changes in the rate of photolysis of ozone by solar radiation. The hot band source functions ({nu} > 2) are invariant above 85 km due to the diurnal invariance in the chemical pumping process. The magnitude of the hot-band source functions is uncertain because of the lack of understanding of the chemical pumping process. Collisional quenching of vibrationally excited ozone by atomic oxygen may reduce the magnitude of the {nu}{sub 3} and {nu}{sub 1} fundamental source functions by 10% near 100 km.

• OSTI ID: 5938072
• Journal Information: Journal of Geophysical Research; (USA), Journal Name: Journal of Geophysical Research; (USA) Vol. 95:D10; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110*
ABSORPTION
ATMOSPHERIC CHEMISTRY
ATOMS
CHEMICAL REACTIONS
CHEMISTRY
DAILY VARIATIONS
DECOMPOSITION
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION
ENERGY-LEVEL TRANSITIONS
EQUATIONS
EQUILIBRIUM
EXCITATION
INFRARED RADIATION
INVARIANCE PRINCIPLES
MEASURING INSTRUMENTS
MESOSPHERE
NONMETALS
OXYGEN
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATION DETECTORS
RADIATIONS
RADIOMETERS
ROTATIONAL INVARIANCE
SOLAR RADIATION
SPECTROSCOPY
STELLAR RADIATION
STRATOSPHERE
TEMPERATURE MEASUREMENT
THERMODYNAMICS
THERMOSPHERE
VARIATIONS