Theoretical Line Shape for H2o Vapor; Application to the Continuum

Clough, S. A.; Kneizys, F. X.; Davies, R. W.; Gamache, Robert R.; Tipping, R. H.

doi:10.1016/b978-0-12-208440-9.50007-7

Cited by 60 publications

(31 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In solar radiation, the 03 absorption cross section is divided into 15 bands in the ultraviolet and visible regions (0.238 N 0.708tcm), while in the near infrared region (0.705r3.57um) used are eight H2O absorption bands and 6 remaining bands, in which the absorbers are aerosol and cloud. For terrestrial radiation, the correlated k-distribution (6k intervals) method is used; H2O 19 bands in 20-2500 cm-1 with the continuum absorption coefficients by Clough et al (1980), CO2 four bands in 500-860 cm-1, and 03 three bands in 930-1190 cm-1.…”

Section: Radiative Heating Calculationmentioning

confidence: 99%

An Estimation of the Radiative Effect in the Stratosphere due to the Pinatubo Aerosol

Shibata¹,

Uchino²,

Kamiyama³

et al. 1996

Journal of the Meteorological Society of Japan

View full text Add to dashboard Cite

show abstract

Section: Radiative Heating Calculationmentioning

confidence: 99%

An Estimation of the Radiative Effect in the Stratosphere due to the Pinatubo Aerosol

Shibata¹,

Uchino²,

Kamiyama³

et al. 1996

Journal of the Meteorological Society of Japan

View full text Add to dashboard Cite

show abstract

“…The response function of the sensor was replaced by a rectangular shape function with the same area. Absorption coefficients of water vapor continuum in the wavenumber range from 950 to 1250cm-1 were modified by following the experimental result obtained by Fukabori et al (1993); that is, the coefficients by Clough et al (1980) were reduced by a 0.7 factor in the wavenumbers range from 1000 to 1200cm-1, and the correction factor was linearly interpolated with wavenumbers between 0.7 and 1.0 in the ranges between 950cm-1 and 1000cm-1, and between 1200cm-1 and 1250cm-1, respectively.…”

Section: Discussionmentioning

confidence: 99%

Ground-Based Cirrus Observation

Uchiyama¹,

Asano²,

Shiobara

et al. 1999

Journal of the Meteorological Society of Japan

View full text Add to dashboard Cite

“…Water vapor, CO2 and ozone absorption are taken into account by the correlated k-method (Lacis et al, 1979). As the continuum absorption coefficient for water vapor, the modified values of Clough et al (1980) were used in the region 850 to 1250cm-1 on the basis of measurements made by Fukabori et al (1993). When we calculated the effective emissivity in Part I, the multiplication properties were used and the correlation of each component was assumed.…”

Section: Radiative Transfer Modelmentioning

confidence: 99%

Ground-Based Cirrus Observation

Uchiyama¹,

Fukabori²

1999

Journal of the Meteorological Society of Japan

View full text Add to dashboard Cite

A ground-based observation system has been developed at the Meteorological Research Institute (MRI) for simultaneous measurements of cloud structure and radiative properties of high-level ice clouds. In this observation system, the cloud microphysical quantities and spectral radiances in the region of the 10um window could be simultaneously observed by a Hydrometeor Video Sonde (HYVIS) and a Fourier Transform Infrared (FTIR) spectro-radiometer. On the basis of the results measured by HYVIS, the size distribution of ice particles was approximated by the power law distribution, and the simulation calculations of observed radiances were made for the some combination of the lower limit of power law distribution (r1) and the optical thickness at 10.5um (Tlo.5). Using these data, the minimum error point is searched in the error map. By this method, we retrieve optical thickness and particle size information.The optically thin, medium and thick cases were analyzed in order to investigate the characteristic of our retrieval method. It is found that the optical thickness determined the magnitude of observed radiance, and size distributions determined the slope of the spectrum in the 860 to 980cm-1 region. The simulated and observed radiances agree within +2mW/(m2 sr cm-1), except the 9.6um ozone band and the root mean squares error 1.2mW/(m2 sr cm-1). The error analysis showed that though 5% systematic error is permitted to optical thickness retrieval in some cases, 1% systematic error causes large errors in the size information retrieval, and that a +500m height error corresponds to 1 to 3% radiance error. Furthermore, the values estimated from the radiance in the region of wavenumber 860 to 980cm-1 were almost the same as those from radiance in the whole region, and the optical thickness may be determined from data in the region 1080 to 1200cm-1 without being affected by the size distribution. We also retrieved 1O.5 and effective radius (reff) using the log-normal size distribution within the same degree of error as obtained by the power law model. Furthermore, we investigated the relationship between the parameters retrieved. The ratio of the visible optical thickness at 0.5,um (T0.5) to the infrared one at 10.5um (T1o.5) on June 22 is 0.4 to 1.0, and that on June 30 is 1.0 to 1.8. There is a tendency that the ratio of T1o.5 to T0.5 becomes large as the effective radius increases. We also investigated the relation between n o.5 and the effective radius (reff) of log-normal size distribution. The relation between them changes case by case. There is a negative correlation between them in the case of June 22. In the case of June 30, the effective radius is scattered between 20 and 85um.Concurrent NOAA-11 satellite data over the Tsukuba area were also analyzed. The results show that observation from the satellite is consistent with the ground based observation, and that the large difference of the brightness temperature observed by the different window channels is closely related to the existence of small ice part...

show abstract

Theoretical Line Shape for H2o Vapor; Application to the Continuum

Cited by 60 publications

References 14 publications

An Estimation of the Radiative Effect in the Stratosphere due to the Pinatubo Aerosol

An Estimation of the Radiative Effect in the Stratosphere due to the Pinatubo Aerosol

Ground-Based Cirrus Observation

Ground-Based Cirrus Observation

Contact Info

Product

Resources

About