Parametric model to estimate clear-sky longwave irradiance at the surface on the basis of vertical distribution of humidity and temperature - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research: Atmospheres Année : 2008

Parametric model to estimate clear-sky longwave irradiance at the surface on the basis of vertical distribution of humidity and temperature

Résumé

The surface downwelling longwave irradiance in clear-sky situations is an important component of the global radiation balance. It can be measured directly using ground-based pyrgeometers or computed using a radiative transfer code given precise information on atmospheric composition (water vapor, ozone, and aerosols) and temperature. Discrepancies between instantaneous observed and simulated values of the clear-sky longwave irradiance are typically at the 3–10 W m−2 level (root-mean-square error). The discrepancies depend both on pyrgeometer and atmospheric composition uncertainties. Over the past century, many authors have worked on deriving control parameters to simulate the clear-sky longwave irradiance using simple parameterizations. The most common control parameters found in the literature are screen-level temperature, screen-level water vapor density, and column integrated precipitable water. We show that reference parameterizations are able to simulate the clear-sky longwave irradiance with an uncertainty of about 10 W m−2. Uncertainties are greater during nighttime than daytime periods. We propose a new parameterization that uses the standard input parameters and their diurnal variations to account for important effects of their vertical distribution on the simulation of clear-sky longwave irradiance. The new parameterization allows us to reduce uncertainties in clear-sky surface downwelling longwave irradiance simulations to better than 5 W m−2 for both daytime and nighttime situations.
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Dates et versions

hal-00281357 , version 1 (05-03-2016)

Identifiants

Citer

Jean-Charles Dupont, Martial Haeffelin, Philippe Drobinski, T. Besnard. Parametric model to estimate clear-sky longwave irradiance at the surface on the basis of vertical distribution of humidity and temperature. Journal of Geophysical Research: Atmospheres, 2008, 113 (D7), pp.D07203. ⟨10.1029/2007JD009046⟩. ⟨hal-00281357⟩
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