Spectral Characterization of the Surface Longwave Radiation over the East Antarctic Plateau

Year: 2017

Authors: Palchetti L., Lanconelli C., Bianchini G., Di Natale G.

Autors Affiliation: National Institute of Optics – INO-CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy; Institute of Atmospheric Science and Climate – ISAC-CNR, via Gobetti 101, 40129 Bologna, Italy; Joint Research Centre, Institute for Environment and Sustainability (IES), Land Resource Management Unit (H05)TP 440, via E. Fermi 2749, 21027 Ispra (VA), Italy

Abstract: The spectral features of the downward longwave radiation have been characterized by exploiting spectral measurements, acquired over the Antarctic Plateau at Dome C at 3230 m, by the Radiation Explorer in the Far InfraRed – Prototype for Applications and Development (REFIR-PAD) spectroradiometer. REFIR-PAD is operative at the base with continuous operations over 24 hours since 2012 and measures the spectra from 100 to 1400 cm(-1) with 0.4 cm(-1) of resolution, covering the under-explored far-IR for the first time with systematic measurements. REFIR-PAD spectral measurements have been used to calculate the atmospheric longwave flux to be compared with standard measurements performed by BSRN, for validation and error estimates. The agreement is within the error estimate of 4.5Wm(-2) for REFIR-PAD and 10Wm(-2) for BRSN measurements. Finally, seasonal variabilities of the longwave flux measured in different spectral regions have been studied by exploiting 1-year dataset of measurements to show possible correlations with different atmospheric regimes.

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More Information: This research was supported by the Italian PNRA (Programma Nazionale di Ricerche in Antartide), under the projects: 2009/A04.03 (PRANA), 2013/AC3.01 (COMPASS), and 2013/AC3.06 (STRRAP-b).

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