2010
DOI: 10.5194/acpd-10-23345-2010
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A upper limit for water dimer absorption in the 750 nm spectral region and a revised water line list

Abstract: The absorption of solar radiation by water dimer molecules in the Earth's atmosphere can potentially act as a positive feedback effect for climate change. There seems little doubt from the results of previous laboratory and theoretical studies that significant concentrations of the water dimer should be present in the atmosphere, yet attempts to detect water dimer absorption signatures in atmospheric field studies have so far yielded inconclusive results. Here we report spectral measurements in the near… Show more

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Cited by 15 publications
(18 citation statements)
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References 50 publications
(126 reference statements)
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“…For all SPAC measurements the retrieved continuum optical depth is proportional to the square of the vapor pressure. As was stressed earlier, this indicates that the contribution to the derived continuum from the "weak" lines was either correctly subtracted using the UCL line list [Shillings et al, 2011] or was negligible. This pressure dependence also appears to be good evidence that there was no condensation or significant water adsorption on the cell optics, as there is no reason why such absorption would exhibit pressure-squared dependence.…”
Section: Implication For the Possible Nature Of The Self-continuum Inmentioning
confidence: 63%
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“…For all SPAC measurements the retrieved continuum optical depth is proportional to the square of the vapor pressure. As was stressed earlier, this indicates that the contribution to the derived continuum from the "weak" lines was either correctly subtracted using the UCL line list [Shillings et al, 2011] or was negligible. This pressure dependence also appears to be good evidence that there was no condensation or significant water adsorption on the cell optics, as there is no reason why such absorption would exhibit pressure-squared dependence.…”
Section: Implication For the Possible Nature Of The Self-continuum Inmentioning
confidence: 63%
“…[20] When retrieving the continuum within monomer absorption bands, the main source of error comes from uncertainty in line parameters of the strongest lines, which [Shillings et al, 2011] (circles). When the HITRAN database is used, the contribution from many weak lines missing in HITRAN and clearly visible in the experimental spectrum leads to an overestimation in the retrieved continuum up to a factor of 2 in this window compared to a retrieval using the UCL line list.…”
Section: Error Of the Derived Continuummentioning
confidence: 99%
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“…One may wonder if water dimer absorption in the near‐UV region may contribute to the measured water vapor absorption. Literature water dimer formation equilibrium constant [ Shillings et al ., ; Temelso et al ., ] is around 0.05 atm −1 at 293 K. Only 0.066% of water vapor exists as water dimer at 10 Torr pressure. In addition, water dimer absorption is expected to have a quadratic dependence on water vapor pressure.…”
Section: Resultsmentioning
confidence: 99%
“…The possible involvement of water clusters in these processes has been proposed for a long time (Bignell et al, 1970;Lee et al, 1973;Coffey, 1977;Wolynes & Roberts, 1978;Carlon, 1979;Dias-Lalcaca et al, 1981). The abundance and the vibrational spectrum of the water dimer and trimer were evaluated both theoretically (Shillings et al, 2010) and in an experiment (Goss et al, 1999). The temperature contributions of the greenhouse gases of the Earth's atmosphere to the greenhouse effect are determined in (Barrett, 2005) according to their volume fraction.…”
mentioning
confidence: 99%