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

Maurizio Busetto, Christian Lanconelli, Mauro Mazzola, Angelo Lupi, Boyan Petkov, Vito Vitale, Claudio Tomasi, Paolo Grigioni, Andrea Pellegrini

Research output: Contribution to journalArticle

2 Citations (Scopus)

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-2and the root mean square (RMS) of 6.2 W m-2are lower than those calculated with previously published parametric equations. © 2013 Antarctic Science Ltd.
Original languageEnglish
Pages (from-to)697 - 710
Number of pages14
JournalAntarctic Science
Volume25
Issue number5
DOIs
Publication statusPublished - Oct 2013
Externally publishedYes

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Geology

Cite this

Busetto, M., Lanconelli, C., Mazzola, M., Lupi, A., Petkov, B., Vitale, V., ... Pellegrini, A. (2013). Parameterization of clear sky effective emissivity under surface-based temperature inversion at Dome C and South Pole, Antarctica. Antarctic Science, 25(5), 697 - 710. https://doi.org/10.1017/S0954102013000096