Abstract
The analysis of the longwave radiation scheme revealed the special role of water vapour among the IR-absorbing and emitting gases in the atmosphere. This is obvious by the fact that water vapour absorption is computed in two terms, i.e. the line term and the continuum term, while absorption rates for all other gases need only the line term. Curiosity for the reason of this distinction lead to the study of the corresponding literature and showed finally a way to improve the performance of the water vapour absorption within this model. The subsequently presented modifications increase the longwave downward fluxes at the surface in cold and/or dry places and help to bring model results in correspondence with observations. The following chapters lead from general properties of gaseous absorption to spectral properties of water vapour, water vapour absorption in the atmospheric window region, the definition of the continuum, and to the hypothetical explanations of the continuum. The succeeding chapters cover the continuum parameterization in ECHAM4, the applied modifications, the validation and finally an estimation of the impact on the ECHAM4 climate. (orig./HM)
Giorgetta, M;
[1]
Wild, M
[2]
- Max-Planck-Institut fuer Meteorologie, Hamburg (Germany)
- Eidgenoessische Technische Hochschule, Zurich (Switzerland)
Citation Formats
Giorgetta, M, and Wild, M.
The water vapour continuum and its representation in ECHAM4.
Germany: N. p.,
1995.
Web.
Giorgetta, M, & Wild, M.
The water vapour continuum and its representation in ECHAM4.
Germany.
Giorgetta, M, and Wild, M.
1995.
"The water vapour continuum and its representation in ECHAM4."
Germany.
@misc{etde_88851,
title = {The water vapour continuum and its representation in ECHAM4}
author = {Giorgetta, M, and Wild, M}
abstractNote = {The analysis of the longwave radiation scheme revealed the special role of water vapour among the IR-absorbing and emitting gases in the atmosphere. This is obvious by the fact that water vapour absorption is computed in two terms, i.e. the line term and the continuum term, while absorption rates for all other gases need only the line term. Curiosity for the reason of this distinction lead to the study of the corresponding literature and showed finally a way to improve the performance of the water vapour absorption within this model. The subsequently presented modifications increase the longwave downward fluxes at the surface in cold and/or dry places and help to bring model results in correspondence with observations. The following chapters lead from general properties of gaseous absorption to spectral properties of water vapour, water vapour absorption in the atmospheric window region, the definition of the continuum, and to the hypothetical explanations of the continuum. The succeeding chapters cover the continuum parameterization in ECHAM4, the applied modifications, the validation and finally an estimation of the impact on the ECHAM4 climate. (orig./HM)}
place = {Germany}
year = {1995}
month = {May}
}
title = {The water vapour continuum and its representation in ECHAM4}
author = {Giorgetta, M, and Wild, M}
abstractNote = {The analysis of the longwave radiation scheme revealed the special role of water vapour among the IR-absorbing and emitting gases in the atmosphere. This is obvious by the fact that water vapour absorption is computed in two terms, i.e. the line term and the continuum term, while absorption rates for all other gases need only the line term. Curiosity for the reason of this distinction lead to the study of the corresponding literature and showed finally a way to improve the performance of the water vapour absorption within this model. The subsequently presented modifications increase the longwave downward fluxes at the surface in cold and/or dry places and help to bring model results in correspondence with observations. The following chapters lead from general properties of gaseous absorption to spectral properties of water vapour, water vapour absorption in the atmospheric window region, the definition of the continuum, and to the hypothetical explanations of the continuum. The succeeding chapters cover the continuum parameterization in ECHAM4, the applied modifications, the validation and finally an estimation of the impact on the ECHAM4 climate. (orig./HM)}
place = {Germany}
year = {1995}
month = {May}
}