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Isotope meteorology of cold front passages: A case study combining observations and modeling

Scholder-Aemisegger, Franziska LU ; Spiegel, J. K.; Pfahl, S.; Sodemann, H.; Eugster, W. and Wernli, H. (2015) In Geophysical Research Letters 42(13). p.5652-5660
Abstract
This study investigates the role of below-cloud evaporation and evapotranspiration for the short-term variability of stable isotopes in near-surface water vapor and precipitation associated with central European cold fronts. To this end, a combination of observations with high temporal resolution and numerical sensitivity experiments with the isotope-enabled regional weather prediction model COSMOiso is used. The representation of the interaction between rain droplets and ambient vapor below the cloud is fundamental for adequately simulating precipitation isotopes ((p)) and total rainfall amount. Neglecting these effects leads to depletion biases of 20-40 in delta H-2(p) and 5-10% in delta O-18(p) and to an increase of 74% in rainfall... (More)
This study investigates the role of below-cloud evaporation and evapotranspiration for the short-term variability of stable isotopes in near-surface water vapor and precipitation associated with central European cold fronts. To this end, a combination of observations with high temporal resolution and numerical sensitivity experiments with the isotope-enabled regional weather prediction model COSMOiso is used. The representation of the interaction between rain droplets and ambient vapor below the cloud is fundamental for adequately simulating precipitation isotopes ((p)) and total rainfall amount. Neglecting these effects leads to depletion biases of 20-40 in delta H-2(p) and 5-10% in delta O-18(p) and to an increase of 74% in rainfall amount. Isotope fractionation during soil evaporation is of primary importance for correctly simulating the variability of continental low-level vapor delta H-2(v) and delta O-18(v) and particularly of the secondary isotope parameter deuterium excess (d(v)). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
stable water isotopes, below-cloud evaporation, evapotranspiration, precipitation, cold front
in
Geophysical Research Letters
volume
42
issue
13
pages
5652 - 5660
publisher
American Geophysical Union
external identifiers
  • wos:000358691300071
  • scopus:84938203185
ISSN
1944-8007
DOI
10.1002/2015GL063988
language
English
LU publication?
yes
id
5374f73d-745e-4639-b00d-65c4320ba87a (old id 7773461)
date added to LUP
2015-09-18 15:26:08
date last changed
2017-08-13 03:58:53
@article{5374f73d-745e-4639-b00d-65c4320ba87a,
  abstract     = {This study investigates the role of below-cloud evaporation and evapotranspiration for the short-term variability of stable isotopes in near-surface water vapor and precipitation associated with central European cold fronts. To this end, a combination of observations with high temporal resolution and numerical sensitivity experiments with the isotope-enabled regional weather prediction model COSMOiso is used. The representation of the interaction between rain droplets and ambient vapor below the cloud is fundamental for adequately simulating precipitation isotopes ((p)) and total rainfall amount. Neglecting these effects leads to depletion biases of 20-40 in delta H-2(p) and 5-10% in delta O-18(p) and to an increase of 74% in rainfall amount. Isotope fractionation during soil evaporation is of primary importance for correctly simulating the variability of continental low-level vapor delta H-2(v) and delta O-18(v) and particularly of the secondary isotope parameter deuterium excess (d(v)).},
  author       = {Scholder-Aemisegger, Franziska and Spiegel, J. K. and Pfahl, S. and Sodemann, H. and Eugster, W. and Wernli, H.},
  issn         = {1944-8007},
  keyword      = {stable water isotopes,below-cloud evaporation,evapotranspiration,precipitation,cold front},
  language     = {eng},
  number       = {13},
  pages        = {5652--5660},
  publisher    = {American Geophysical Union},
  series       = {Geophysical Research Letters},
  title        = {Isotope meteorology of cold front passages: A case study combining observations and modeling},
  url          = {http://dx.doi.org/10.1002/2015GL063988},
  volume       = {42},
  year         = {2015},
}