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Parameterization of clear sky effective emissivity under surface-based temperature inversion at Dome C and South Pole, Antarctica

Published online by Cambridge University Press:  02 April 2013

Maurizio Busetto ,
Christian Lanconelli ,
Mauro Mazzola ,
Angelo Lupi ,
Boyan Petkov ,
Vito Vitale ,
Claudio Tomasi ,
Paolo Grigioni  and
Andrea Pellegrini
Maurizio Busetto*
Affiliation:
Institute of Atmospheric Sciences and Climate, National Research Council, Via Gobetti 101, 40129 Bologna, Italy
Christian Lanconelli
Affiliation:
Institute of Atmospheric Sciences and Climate, National Research Council, Via Gobetti 101, 40129 Bologna, Italy
Mauro Mazzola
Affiliation:
Institute of Atmospheric Sciences and Climate, National Research Council, Via Gobetti 101, 40129 Bologna, Italy
Angelo Lupi
Affiliation:
Institute of Atmospheric Sciences and Climate, National Research Council, Via Gobetti 101, 40129 Bologna, Italy
Boyan Petkov
Affiliation:
Institute of Atmospheric Sciences and Climate, National Research Council, Via Gobetti 101, 40129 Bologna, Italy International Centre for Theoretical Physics, Strada Costiera 11, 34014 Trieste, Italy
Vito Vitale
Affiliation:
Institute of Atmospheric Sciences and Climate, National Research Council, Via Gobetti 101, 40129 Bologna, Italy
Claudio Tomasi
Affiliation:
Institute of Atmospheric Sciences and Climate, National Research Council, Via Gobetti 101, 40129 Bologna, Italy
Paolo Grigioni
Affiliation:
Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Via Anguillarese 301, 00123 Roma, Italy
Andrea Pellegrini
Affiliation:
Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Via Anguillarese 301, 00123 Roma, Italy
*
m.busetto@isac.cnr.it
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Abstract

For most parts of the year the Antarctic Plateau has a surface temperature inversion with strength c. 20 K. Under such conditions the warmer air at the top of the inversion layer contributes more to the clear sky atmospheric longwave radiation at surface level than does the colder air near the ground. Hence, it is more appropriate to relate longwave irradiance (LWI) to the top of the inversion layer temperature (Tm) than to the ground level temperature (Tg). Analysis of radio soundings carried out at Dome C and South Pole during 2006–08 shows that the temperature at 400 m above the surface (T400) is a good proxy for Tm and is linearly related to Tg with correlation coefficients greater than 0.8. During summer, radiosonde measurements show almost isothermal conditions, hence T400 still remains a good proxy for the lower troposphere maximum temperature. A methodology is presented to parameterize the clear sky effective emissivity in terms of the troposphere maximum temperature, using ground temperature measurements. The predicted 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 those calculated with previously published parametric equations.

Keywords

BSRNdownwelling longwave irradiancehigh Antarctic Plateauradio sounding
Type
Physical Sciences
Information
Antarctic Science , Volume 25 , Issue 5 , October 2013 , pp. 697 - 710
Copyright
Copyright © Antarctic Science Ltd 2013 

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