Abstract

For most parts of the year the Antarctic Plateau has a surface temperature inversion with strengthc. 20 K. Under such conditions the warmer air at the top of the inversion layer contributes more to the clearsky atmospheric longwave radiation at surface level than does the colder air near the ground. Hence, it ismore appropriate to relate longwave irradiance (LWI) to the top of the inversion layer temperature (T_m) than to the ground level temperature (T_g ). Analysis of radio soundings carried out at Dome C and SouthPole during 2006-08 shows that the temperature at 400 m above the surface (T_400 ) is a good proxy for T_m and is linearly related to T_g with correlation coefficients greater than 0.8. During summer, radiosondemeasurements show almost isothermal conditions, hence T 400 still remains a good proxy for the lowertroposphere maximum temperature. A methodology is presented to parameterize the clear sky effectiveemissivity in terms of the troposphere maximum temperature, using ground temperature measurements. Thepredicted LWI values for both sites are comparable with those obtained using radiative transfer models,while for Dome C the bias of 0.8 W m^-2 and the root mean square (RMS) of 6.2 W m^-2 are lower than thosecalculated with previously published parametric equations.

Autore Pugliese

• Pellegrini Andrea

Tutti gli autori

• M. Busetto; C. Lanconelli; M. Mazzola; A. Lupi; B. Petkov; V. Vitale; C. Tomasi; P. Grigioni; A. Pellegrini

Titolo volume/Rivista

Antarctic science

Anno di pubblicazione

2013

ISSN

0954-1020

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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