Research output: Contribution to journal › Article › peer-review
Hierarchy of vibrational state sets for the solution of the CO2 non-LTE problem. / Ogibalov, V. P.; Shved, G. M.
In: Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere, Vol. 25, No. 5-6, 01.12.2000, p. 485-492.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Hierarchy of vibrational state sets for the solution of the CO2 non-LTE problem
AU - Ogibalov, V. P.
AU - Shved, G. M.
PY - 2000/12/1
Y1 - 2000/12/1
N2 - The extended non-LTE model for the CO2 infrared bands in the Earth atmosphere includes a set of 328 vibrational states of seven CO2 isotopes (Shved et al., 1998). To simplify solving the non-LTE problem of radiative transfer in the CO2 bands, a procedure of reducing the amount of the vibrational states is formulated. A hierarchy of three models, which are simplier than the extended model but provide a reliable accuracy of estimating non-equilibrium populations, is proposed. In the direction of decreasing accuracy, these simplified models include 206 and 117 states of seven CO2 isotopes, and 60 states of five CO2 isotopes, respectively. Even the simplest model allows evaluation the populations of the lower vibrational states with a reasonable precision. The errors in estimating the total non-LTE limb radiance for the 4.3 and 15 μm CO2 bands with this model do not exceed the order of 10% and 1%, respectively. Use of the simplest model in evaluating the rate of net radiative heating in all the infrared CO2 bands gives errors which do not exceed ∼ 0.01 K/day above about 80 km and increase down to the stratopause up to ∼ 0.04 K/day.
AB - The extended non-LTE model for the CO2 infrared bands in the Earth atmosphere includes a set of 328 vibrational states of seven CO2 isotopes (Shved et al., 1998). To simplify solving the non-LTE problem of radiative transfer in the CO2 bands, a procedure of reducing the amount of the vibrational states is formulated. A hierarchy of three models, which are simplier than the extended model but provide a reliable accuracy of estimating non-equilibrium populations, is proposed. In the direction of decreasing accuracy, these simplified models include 206 and 117 states of seven CO2 isotopes, and 60 states of five CO2 isotopes, respectively. Even the simplest model allows evaluation the populations of the lower vibrational states with a reasonable precision. The errors in estimating the total non-LTE limb radiance for the 4.3 and 15 μm CO2 bands with this model do not exceed the order of 10% and 1%, respectively. Use of the simplest model in evaluating the rate of net radiative heating in all the infrared CO2 bands gives errors which do not exceed ∼ 0.01 K/day above about 80 km and increase down to the stratopause up to ∼ 0.04 K/day.
UR - http://www.scopus.com/inward/record.url?scp=0033836604&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0033836604
VL - 25
SP - 485
EP - 492
JO - Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere
JF - Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere
SN - 1464-1909
IS - 5-6
ER -
ID: 39862190