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  Global radiative and climate effect of the water vapour continuum at visible and near-infrared wavelengths

Rädel, G., Shine, K., & Ptashnik, I. (2015). Global radiative and climate effect of the water vapour continuum at visible and near-infrared wavelengths. Quarterly Journal of the Royal Meteorological Society, 141, 727-738. doi:10.1002/qj.2385.

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R-del_et_al-2015-Quarterly_Journal_of_the_Royal_Meteorological_Society.pdf (Publisher version), 2MB
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Rädel, Gaby1, Author
Shine, K.P., Author
Ptashnik, I.V., Author
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1Climate Dynamics, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913568              

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Free keywords: radiative transfer; solar radiation; self-continuum; foreign-continuum; global dimming; water vapour feedback
 Abstract: Recent laboratory measurements show that absorption by the water vapour continuum in near-infrared windows may be about an order of magnitude higher than assumed in many radiation codes. The radiative impact of the continuum at visible and near-infrared wavelengths is examined for the present day and for a possible future warmer climate (with a global-mean total column water increase of 33%). The calculations use a continuum model frequently used in climate models ('CKD') and a continuum model where absorption is enhanced at wavelengths greater than 1 μm based on recent measurements ('CAVIAR'). The continuum predominantly changes the partitioning between solar radiation absorbed by the surface and the atmosphere; changes in top-of-atmosphere net irradiances are smaller. The global-mean clear-sky atmospheric absorption is enhanced by 1.5 W m-2 (about 2%) and 2.8 W m-2 (about 3.5%) for CKD and CAVIAR respectively, relative to a hypothetical no-continuum case, with all-sky enhancements about 80% of these values. The continuum is, in relative terms, more important for radiation budget changes between the present day and a possible future climate. Relative to the no-continuum case, the increase in global-mean clear-sky absorption is 8% higher using CKD and almost 20% higher using CAVIAR; all-sky enhancements are about half these values. The effect of the continuum is estimated for the solar component of the water vapour feedback, the reduction in downward surface irradiance and precipitation change in a warmer world. For CKD and CAVIAR respectively, and relative to the no-continuum case, the solar component of the water vapour feedback is enhanced by about 4 and 9%, the change in clear-sky downward surface irradiance is 7 and 18% more negative, and the global-mean precipitation response decreases by 1 and 4%. There is a continued need for improved continuum measurements, especially at atmospheric temperatures and at wavelengths below 2 μm. © 2014 The Authors.

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Language(s): eng - English
 Dates: 2014-04-102014-06-192015-04
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/qj.2385
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Title: Quarterly Journal of the Royal Meteorological Society
Source Genre: Journal
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Publ. Info: Reading, Berkshire, England [etc.] : Royal Meteorological Society.
Pages: - Volume / Issue: 141 Sequence Number: - Start / End Page: 727 - 738 Identifier: ISSN: 0035-9009
CoNE: https://pure.mpg.de/cone/journals/resource/954925442598