One year of downwelling spectral radiance measurements from 100 to 1400 cm−1 at Dome Concordia: Results in clear conditions
The present work examines downwelling radiance spectra measured at the ground during 2013 by a Far Infrared Fourier Transform Spectrometer at Dome C, Antarctica. A tropospheric backscatter and depolarization lidar is also deployed at same site, and a radiosonde system is routinely operative. The mea...
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ftunibolognairis:oai:cris.unibo.it:11585/570409 2024-09-15T17:44:45+00:00 One year of downwelling spectral radiance measurements from 100 to 1400 cm−1 at Dome Concordia: Results in clear conditions RIZZI, ROLANDO MAESTRI, TIZIANO Arosio, C. Palchetti, L. Bianchini, G. Del Guasta, M. Rizzi, R Arosio, C. Maestri, T. Palchetti, L. Bianchini, G. Del Guasta, M. 2016 STAMPA http://hdl.handle.net/11585/570409 https://doi.org/10.1002/2016JD025341 http://onlinelibrary.wiley.com/doi/10.1002/2016JD025341/abstract eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000385836000005 volume:121 issue:18 firstpage:10937 lastpage:10953 numberofpages:17 journal:JOURNAL OF GEOPHYSICAL RESEARCH. ATMOSPHERES http://hdl.handle.net/11585/570409 doi:10.1002/2016JD025341 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84991257143 http://onlinelibrary.wiley.com/doi/10.1002/2016JD025341/abstract Dome C far infrared water vapor continuum Geophysic Oceanography Forestry Ecology Aquatic Science Water Science and Technology Soil Science Geochemistry and Petrology Earth-Surface Processe Atmospheric Science Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Paleontology info:eu-repo/semantics/article 2016 ftunibolognairis https://doi.org/10.1002/2016JD025341 2024-06-24T14:22:20Z The present work examines downwelling radiance spectra measured at the ground during 2013 by a Far Infrared Fourier Transform Spectrometer at Dome C, Antarctica. A tropospheric backscatter and depolarization lidar is also deployed at same site, and a radiosonde system is routinely operative. The measurements allow characterization of the water vapor and clouds infrared properties in Antarctica under all sky conditions. In this paper we specifically discuss cloud detection and the analysis in clear sky condition, required for the discussion of the results obtained in cloudy conditions. First, the paper discusses the procedures adopted for the quality control of spectra acquired automatically. Then it describes the classification procedure used to discriminate spectra measured in clear sky from cloudy conditions. Finally a selection is performed and 66 clear cases, spanning the whole year, are compared to simulations. The computation of layer molecular optical depth is performed with line-by-line techniques and a convolution to simulate the Radiation Explorer in the Far InfraRed-Prototype for Applications and Development (REFIR-PAD) measurements; the downwelling radiance for selected clear cases is computed with a state-of-the-art adding-doubling code. The mean difference over all selected cases between simulated and measured radiance is within experimental error for all the selected microwindows except for the negative residuals found for all microwindows in the range 200 to 400 cm−1, with largest values around 295.1 cm−1. The paper discusses possible reasons for the discrepancy and identifies the incorrect magnitude of the water vapor total absorption coefficient as the cause of such large negative radiance bias below 400 cm−1. Article in Journal/Newspaper Antarc* Antarctica IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Journal of Geophysical Research: Atmospheres 121 18 10,937 10,953 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
Dome C far infrared water vapor continuum Geophysic Oceanography Forestry Ecology Aquatic Science Water Science and Technology Soil Science Geochemistry and Petrology Earth-Surface Processe Atmospheric Science Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Paleontology |
spellingShingle |
Dome C far infrared water vapor continuum Geophysic Oceanography Forestry Ecology Aquatic Science Water Science and Technology Soil Science Geochemistry and Petrology Earth-Surface Processe Atmospheric Science Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Paleontology RIZZI, ROLANDO MAESTRI, TIZIANO Arosio, C. Palchetti, L. Bianchini, G. Del Guasta, M. One year of downwelling spectral radiance measurements from 100 to 1400 cm−1 at Dome Concordia: Results in clear conditions |
topic_facet |
Dome C far infrared water vapor continuum Geophysic Oceanography Forestry Ecology Aquatic Science Water Science and Technology Soil Science Geochemistry and Petrology Earth-Surface Processe Atmospheric Science Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Paleontology |
description |
The present work examines downwelling radiance spectra measured at the ground during 2013 by a Far Infrared Fourier Transform Spectrometer at Dome C, Antarctica. A tropospheric backscatter and depolarization lidar is also deployed at same site, and a radiosonde system is routinely operative. The measurements allow characterization of the water vapor and clouds infrared properties in Antarctica under all sky conditions. In this paper we specifically discuss cloud detection and the analysis in clear sky condition, required for the discussion of the results obtained in cloudy conditions. First, the paper discusses the procedures adopted for the quality control of spectra acquired automatically. Then it describes the classification procedure used to discriminate spectra measured in clear sky from cloudy conditions. Finally a selection is performed and 66 clear cases, spanning the whole year, are compared to simulations. The computation of layer molecular optical depth is performed with line-by-line techniques and a convolution to simulate the Radiation Explorer in the Far InfraRed-Prototype for Applications and Development (REFIR-PAD) measurements; the downwelling radiance for selected clear cases is computed with a state-of-the-art adding-doubling code. The mean difference over all selected cases between simulated and measured radiance is within experimental error for all the selected microwindows except for the negative residuals found for all microwindows in the range 200 to 400 cm−1, with largest values around 295.1 cm−1. The paper discusses possible reasons for the discrepancy and identifies the incorrect magnitude of the water vapor total absorption coefficient as the cause of such large negative radiance bias below 400 cm−1. |
author2 |
Rizzi, R Arosio, C. Maestri, T. Palchetti, L. Bianchini, G. Del Guasta, M. |
format |
Article in Journal/Newspaper |
author |
RIZZI, ROLANDO MAESTRI, TIZIANO Arosio, C. Palchetti, L. Bianchini, G. Del Guasta, M. |
author_facet |
RIZZI, ROLANDO MAESTRI, TIZIANO Arosio, C. Palchetti, L. Bianchini, G. Del Guasta, M. |
author_sort |
RIZZI, ROLANDO |
title |
One year of downwelling spectral radiance measurements from 100 to 1400 cm−1 at Dome Concordia: Results in clear conditions |
title_short |
One year of downwelling spectral radiance measurements from 100 to 1400 cm−1 at Dome Concordia: Results in clear conditions |
title_full |
One year of downwelling spectral radiance measurements from 100 to 1400 cm−1 at Dome Concordia: Results in clear conditions |
title_fullStr |
One year of downwelling spectral radiance measurements from 100 to 1400 cm−1 at Dome Concordia: Results in clear conditions |
title_full_unstemmed |
One year of downwelling spectral radiance measurements from 100 to 1400 cm−1 at Dome Concordia: Results in clear conditions |
title_sort |
one year of downwelling spectral radiance measurements from 100 to 1400 cm−1 at dome concordia: results in clear conditions |
publishDate |
2016 |
url |
http://hdl.handle.net/11585/570409 https://doi.org/10.1002/2016JD025341 http://onlinelibrary.wiley.com/doi/10.1002/2016JD025341/abstract |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000385836000005 volume:121 issue:18 firstpage:10937 lastpage:10953 numberofpages:17 journal:JOURNAL OF GEOPHYSICAL RESEARCH. ATMOSPHERES http://hdl.handle.net/11585/570409 doi:10.1002/2016JD025341 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84991257143 http://onlinelibrary.wiley.com/doi/10.1002/2016JD025341/abstract |
op_doi |
https://doi.org/10.1002/2016JD025341 |
container_title |
Journal of Geophysical Research: Atmospheres |
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121 |
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18 |
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10,937 |
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10,953 |
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