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| Titel |
Climatic controls on water vapor deuterium excess in the marine boundary layer of the North Atlantic based on 500 days of in situ, continuous measurements |
| VerfasserIn |
H. C. Steen-Larsen, Á. E. Sveinbjörnsdóttir, A. J. Peters, V. Masson-Delmotte, M. P. Guishard, G. Hsiao, J. Jouzel, D. Noone, J. K. Warren, J. W. C. White |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 15 ; Nr. 14, no. 15 (2014-08-04), S.7741-7756 |
| Datensatznummer |
250118919
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| Publikation (Nr.) |
 copernicus.org/acp-14-7741-2014.pdf |
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| Zusammenfassung |
| Continuous, in situ measurements of water vapor isotopic composition
have been conducted in the North Atlantic, at the Bermuda Islands
(32.26° N, 64.88° W), between November 2011 and
June 2013, using a cavity ring-down spectrometer water vapor isotope
analyzer and an autonomous self-designed calibration
system. Meticulous calibration allows us to reach an accuracy and
precision on 10 min average of δ18O, δ D, and
d-excess of, 0.14, 0.85, and
1.1‰, verified using two parallel instruments with
independent calibration. As a result of more than 500 days with
6-hourly data the relationships between deuterium excess, relative
humidity (RH), sea surface temperature (SST), wind speed, and
wind direction are assessed. From the whole data set, 84 % of
d-excess variance is explained by a strong linear relationship
with relative humidity. The slope of this relationship (−42.6 ± 0.4‰ % (RH))
is similar to the theoretical
prediction of Merlivat and Jouzel (1979) for SST between
20 and 30 °C. However, in contrast with theory,
no effect of wind speed could be detected on the relationship
between d-excess and relative humidity. Separating the data set
into winter, spring, summer, and autumn seasons reveals different
linear relationships between d-excess and humidity. Changes in
wind directions are observed to affect the relationships between
d-excess and humidity. The observed seasonal variability in the
relationship between d-excess and relative humidity underlines
the importance of long-term monitoring to make accurate conclusions. |
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