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Continuous monitoring of summer surface water vapor isotopic composition above the Greenland Ice Sheet

Steen-Larsen, H. C.; Johnsen, S. J.; Masson-Delmotte, V.; Stenni, B.; Risi, C.; Sodemann, H.; Balslev-Clausen, D.; Blunier, T.; Dahl-Jensen, D. and Ellehoj, M. D., et al. (2013) In Atmospheric Chemistry and Physics 13(9). p.4815-4828
Abstract
We present here surface water vapor isotopic measurements conducted from June to August 2010 at the NEEM (North Greenland Eemian Drilling Project) camp, NW Greenland (77.45 degrees N, 51.05 degrees W, 2484 m a.s.l.). Measurements were conducted at 9 different heights from 0.1m to 13.5m above the snow surface using two different types of cavity-enhanced near-infrared absorption spectroscopy analyzers. For each instrument specific protocols were developed for calibration and drift corrections. The inter-comparison of corrected results from different instruments reveals excellent reproducibility, stability, and precision with a standard deviations of similar to 0.23 parts per thousand for delta O-18 and similar to 1.4 parts per thousand for... (More)
We present here surface water vapor isotopic measurements conducted from June to August 2010 at the NEEM (North Greenland Eemian Drilling Project) camp, NW Greenland (77.45 degrees N, 51.05 degrees W, 2484 m a.s.l.). Measurements were conducted at 9 different heights from 0.1m to 13.5m above the snow surface using two different types of cavity-enhanced near-infrared absorption spectroscopy analyzers. For each instrument specific protocols were developed for calibration and drift corrections. The inter-comparison of corrected results from different instruments reveals excellent reproducibility, stability, and precision with a standard deviations of similar to 0.23 parts per thousand for delta O-18 and similar to 1.4 parts per thousand for delta D. Diurnal and intraseasonal variations show strong relationships between changes in local surface humidity and water vapor isotopic composition, and with local and synoptic weather conditions. This variability probably results from the interplay between local moisture fluxes, linked with firn-air exchanges, boundary layer dynamics, and large-scale moisture advection. Particularly remarkable are several episodes characterized by high (> 40 parts per thousand) surface water vapor deuterium excess. Air mass back-trajectory calculations from atmospheric analyses and water tagging in the LMDZiso (Laboratory of Meteorology Dynamics Zoom-isotopic) atmospheric model reveal that these events are associated with predominant Arctic air mass origin. The analysis suggests that high deuterium excess levels are a result of strong kinetic fractionation during evaporation at the sea-ice margin. (Less)
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publication status
published
subject
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Atmospheric Chemistry and Physics
volume
13
issue
9
pages
4815 - 4828
publisher
Copernicus Gesellschaft mbH
external identifiers
  • wos:000318941300022
  • scopus:84896692801
ISSN
1680-7324
DOI
10.5194/acp-13-4815-2013
project
BECC
MERGE
language
English
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yes
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952d7302-55ae-457a-966f-1c19a794159c (old id 3931291)
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2013-07-15 15:06:17
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2019-09-22 03:17:35
@article{952d7302-55ae-457a-966f-1c19a794159c,
  abstract     = {We present here surface water vapor isotopic measurements conducted from June to August 2010 at the NEEM (North Greenland Eemian Drilling Project) camp, NW Greenland (77.45 degrees N, 51.05 degrees W, 2484 m a.s.l.). Measurements were conducted at 9 different heights from 0.1m to 13.5m above the snow surface using two different types of cavity-enhanced near-infrared absorption spectroscopy analyzers. For each instrument specific protocols were developed for calibration and drift corrections. The inter-comparison of corrected results from different instruments reveals excellent reproducibility, stability, and precision with a standard deviations of similar to 0.23 parts per thousand for delta O-18 and similar to 1.4 parts per thousand for delta D. Diurnal and intraseasonal variations show strong relationships between changes in local surface humidity and water vapor isotopic composition, and with local and synoptic weather conditions. This variability probably results from the interplay between local moisture fluxes, linked with firn-air exchanges, boundary layer dynamics, and large-scale moisture advection. Particularly remarkable are several episodes characterized by high (> 40 parts per thousand) surface water vapor deuterium excess. Air mass back-trajectory calculations from atmospheric analyses and water tagging in the LMDZiso (Laboratory of Meteorology Dynamics Zoom-isotopic) atmospheric model reveal that these events are associated with predominant Arctic air mass origin. The analysis suggests that high deuterium excess levels are a result of strong kinetic fractionation during evaporation at the sea-ice margin.},
  author       = {Steen-Larsen, H. C. and Johnsen, S. J. and Masson-Delmotte, V. and Stenni, B. and Risi, C. and Sodemann, H. and Balslev-Clausen, D. and Blunier, T. and Dahl-Jensen, D. and Ellehoj, M. D. and Falourd, S. and Grindsted, A. and Gkinis, V. and Jouzel, J. and Popp, T. and Sheldon, S. and Simonsen, S. B. and Sjolte, Jesper and Steffensen, J. P. and Sperlich, P. and Sveinbjornsdottir, A. E. and Vinther, B. M. and White, J. W. C.},
  issn         = {1680-7324},
  language     = {eng},
  number       = {9},
  pages        = {4815--4828},
  publisher    = {Copernicus Gesellschaft mbH},
  series       = {Atmospheric Chemistry and Physics},
  title        = {Continuous monitoring of summer surface water vapor isotopic composition above the Greenland Ice Sheet},
  url          = {http://dx.doi.org/10.5194/acp-13-4815-2013},
  volume       = {13},
  year         = {2013},
}