sasktran2.optical.O3DBM

class sasktran2.optical.O3DBM

Bases: OpticalDatabaseGenericAbsorber

Tabulated high resolution cross-sections of O3 measured by Daumont, Brion and Malicet in the early 1990’s [1]. The wavelength range slightly varies with temperature but covers the entire UV to NIR region, from 194.50 nm to 830.00 nm at 0.01 to 0.02 nm resolution. The cross-section data were collected at 0.01-0.02 nm resolution and each wavelength/cross-section table varies in size from 22,052 to 63,501 entries. The data consists of 5 tables of wavelength versus cross-section for 5 temperatures.

Notes

Temerature Range

Measurements are provided at 5 temperatures covering typical stratospheric and tropospheric conditions:

218 K

228 K

243 K

273 K

295 K

Wavelength Range

The wavelength range of each temperature table is slightly different and is given below. Note that most of the temperature variation occurs in the Huggins band between 315 and 360 nm:

218K -> 194.50nm to 650.01nm

228K -> 194.50nm to 520.01nm

243K -> 194.50nm to 519.01nm

273K -> 299.50nm to 520.01nm

295K -> 195.00nm to 830.00nm

We looked into temperature interpolation and while DBM suggest that a quadratic interpolation scheme [3] they do not indicate an explicit technique. We tested several quadratic fitting routines and found that a truncated linear fit in temperature was visually more appealing than any of the quadratic fits and had none of the undesirable artifacts (excessive curvature etc.) that naturally arise with quadratic curve fitting. Consequently this object uses a truncated linear fit in temperature.

Data Source

These data are an exact replication of the data files:

O3_CRS_BDM_218K.dat

O3_CRS_BDM_228K.dat

O3_CRS_BDM_243K.dat

O3_CRS_BDM_273K.dat

O3_CRS_BDM_295K.dat

Data is from the IGACO site, http://igaco-o3.fmi.fi/ACSO/cross_sections.html. The files were copied on July 16-July 25 2012.

References

[1]

Daumont, D., et al. “Ozone UV spectroscopy I: Absorption cross-sections at room temperature.” Journal of Atmospheric Chemistry 15.2 (1992): 145-155.

[2]

Brion, J., et al. “High-resolution laboratory absorption cross section of O3. Temperature effect.” Chemical physics letters 213.5 - 6(1993): 610-612.

[3]

Malicet, J., et al. “Ozone UV spectroscopy. II. Absorption cross-sections and temperature dependence.” Journal of Atmospheric Chemistry 21.3 (1995): 263-273.

[4]

Brion, J., et al. “Absorption spectra measurements for the ozone molecule in the 350-830 nm region.” Journal of Atmospheric Chemistry 30.2 (1998): 291-299.

Raises:

OSError – If the file could not be found

__init__() → None

Tabulated high resolution cross-sections of O3 measured by Daumont, Brion and Malicet in the early 1990’s [1]. The wavelength range slightly varies with temperature but covers the entire UV to NIR region, from 194.50 nm to 830.00 nm at 0.01 to 0.02 nm resolution. The cross-section data were collected at 0.01-0.02 nm resolution and each wavelength/cross-section table varies in size from 22,052 to 63,501 entries. The data consists of 5 tables of wavelength versus cross-section for 5 temperatures.

Notes

Temerature Range

Measurements are provided at 5 temperatures covering typical stratospheric and tropospheric conditions:

218 K

228 K

243 K

273 K

295 K

Wavelength Range

The wavelength range of each temperature table is slightly different and is given below. Note that most of the temperature variation occurs in the Huggins band between 315 and 360 nm:

218K -> 194.50nm to 650.01nm

228K -> 194.50nm to 520.01nm

243K -> 194.50nm to 519.01nm

273K -> 299.50nm to 520.01nm

295K -> 195.00nm to 830.00nm

We looked into temperature interpolation and while DBM suggest that a quadratic interpolation scheme [3] they do not indicate an explicit technique. We tested several quadratic fitting routines and found that a truncated linear fit in temperature was visually more appealing than any of the quadratic fits and had none of the undesirable artifacts (excessive curvature etc.) that naturally arise with quadratic curve fitting. Consequently this object uses a truncated linear fit in temperature.

Data Source

These data are an exact replication of the data files:

O3_CRS_BDM_218K.dat

O3_CRS_BDM_228K.dat

O3_CRS_BDM_243K.dat

O3_CRS_BDM_273K.dat

O3_CRS_BDM_295K.dat

Data is from the IGACO site, http://igaco-o3.fmi.fi/ACSO/cross_sections.html. The files were copied on July 16-July 25 2012.

References

[1]

Daumont, D., et al. “Ozone UV spectroscopy I: Absorption cross-sections at room temperature.” Journal of Atmospheric Chemistry 15.2 (1992): 145-155.

[2]

Brion, J., et al. “High-resolution laboratory absorption cross section of O3. Temperature effect.” Chemical physics letters 213.5 - 6(1993): 610-612.

[3]

Malicet, J., et al. “Ozone UV spectroscopy. II. Absorption cross-sections and temperature dependence.” Journal of Atmospheric Chemistry 21.3 (1995): 263-273.

[4]

Brion, J., et al. “Absorption spectra measurements for the ozone molecule in the 350-830 nm region.” Journal of Atmospheric Chemistry 30.2 (1998): 291-299.

Raises:

OSError – If the file could not be found

Methods

__init__()	Tabulated high resolution cross-sections of O3 measured by Daumont, Brion and Malicet in the early 1990's [1].
atmosphere_quantities(atmo, **kwargs)
cross_section_derivatives(wavelengths_nm, ...)
cross_sections(wavelengths_nm, altitudes_m, ...)
optical_derivatives(atmo, **kwargs)