pyrtlib.absorption_model.O2AbsModel.o2_absorption

O2AbsModel.o2_absorption(pdrykpa: float, vx: float, ekpa: float, frq: float, amu: Optional[dict] = None) → Tuple[ndarray, ndarray]

Returns power absorption coefficient due to oxygen in air in nepers/km.

History:

• 5/1/95 P. Rosenkranz

• 11/5/97 P. Rosenkranz - 1- line modification.

• 12/16/98 pwr - updated submm freq’s and intensities from HITRAN96

• 8/21/02 pwr - revised width at 425

• 3/20/03 pwr - 1- line mixing and width revised

• 9/29/04 pwr - new widths and mixing, using HITRAN intensities for all lines

• 6/12/06 pwr - chg. T dependence of 1- line to 0.8

• 10/14/08 pwr - moved isotope abundance back into intensities, added selected O16O18 lines.

• 5/30/09 pwr - remove common block, add weak lines.

• 12/18/14 pwr - adjust line broadening due to water vapor.

• 9/29/18 pwr - 2nd-order line mixing

• 8/20/19 pwr - adjust intensities according to Koshelev meas.

Parameters:

• pdrykpa (numpy.ndarray) – Dry air pressure (kPa).

• vx (numpy.ndarray) – Theta (adim) - (normalised temperature 300/t(K)).

• ekpa (numpy.ndarray) – Water vapor partial pressure (kPa).

• frq (numpy.ndarray) – Frequency (GHz) - (valid 0-1000 GHz).

Returns:

Oxigen line and continuum absorption terms (ppm)

Return type:

[numpy.ndarray]

References

[1]

P.W. Rosenkranz, CHAP. 2 and appendix, in ATMOSPHERIC REMOTE SENSING BY MICROWAVE RADIOMETRY (M.A. Janssen, ed., 1993)(http://hdl.handle.net/1721.1/68611).

[2]

G.Yu. Golubiatnikov & A.F. Krupnov, J. Mol. Spect. v.217, pp.282-287 (2003).

[3]

M.Yu. Tretyakov et al, J. Mol. Spect. v.223, pp.31-38 (2004).

[4]

M.Yu. Tretyakov et al, J. Mol. Spect. v.231, pp.1-14 (2005).

[5]

B.J. Drouin, JQSRT v.105, pp.450-458 (2007).

[6]

D.S. Makarov et al, J. Mol. Spect. v.252, pp.242-243 (2008).

[7]

D.S. Makarov et al, JQSRT v.112, pp.1420-1428 (2011).

[8]

M.A. Koshelev et al, JQSRT, v.154, pp.24-27 (2015).

[9]

M.A. Koshelev et al, JQSRT, v.169, pp.91-95 (2016).

[10]

M.A. Koshelev et al, JQSRT, v.196, pp.78?86 (2017).

[11]

D.S. Makarov et al, JQSRT v.243 (March 2020) doi:10.1016/j.jqsrt.2019.106798

Line intensities from HITRAN2004. Non-resonant intensity from JPL catalog.

Note

1. The mm line-width coefficients are from Tretyakov et al 2005, Makarov et al 2008, and Koshelev et al 2016; submm line-widths from Golubiatnikov & Krupnov, except 234-GHz line width from Drouin. Mixing coeff. from Makarov’s 2018 revision.

2. The same temperature dependence (X) is used for submillimeter line widths as in the 60 GHz band: (1/T)**X (Koshelev et al 2016).