References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-14-7741-2014

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

Steen-Larsen

H. C.

¹ ² Sveinbjörnsdottir

A. E.

³ Peters

A. J.

⁴ Masson-Delmotte

https://orcid.org/0000-0001-8296-381X

¹ Guishard

M. P.

⁴ Hsiao

⁵ Jouzel

¹ Noone

² Warren

J. K.

⁴ White

J. W. C.

⁶

Laboratoire des Sciences du Climat et de l'Environnement, UMR CEA-CNRS-UVSQ/IPSL 8212, Gif-sur-Yvette, France

Department of Atmospheric and Oceanic Sciences, and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA

Institute of Earth Sciences, University of Iceland, Reykjavik, Iceland

Bermuda Institute of Ocean Sciences, St. George's GE 01, Bermuda, UK

Picarro Inc., Santa Clara, California, USA

Institute of Arctic and Alpine Research, Campus Box 450, University of Colorado, Boulder, Colorado, USA

04 08 2014

14 15 7741 7756

2014

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://acp.copernicus.org/articles/14/7741/2014/acp-14-7741-2014.html

The full text article is available as a PDF file from https://acp.copernicus.org/articles/14/7741/2014/acp-14-7741-2014.pdf

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&permil;, 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&permil; % (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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