References

AMT

Atmospheric Measurement Techniques

AMT

Atmos. Meas. Tech.

1867-8548

Copernicus Publications

Göttingen, Germany

10.5194/amt-7-1763-2014

Continuous measurements of atmospheric water vapour isotopes in western Siberia (Kourovka)

Bastrikov

¹ ² ³ Steen-Larsen

H. C.

² Masson-Delmotte

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

² Gribanov

¹ Cattani

² Jouzel

² Zakharov

Ural Federal University, Ekaterinburg, 620002, Russia

LSCE/IPSL, UMR8212, CEA-CNRS-UVSQ, CEA Saclay, Gif-sur-Yvette, 91191, France

Institute of Industrial Ecology UB RAS, Ekaterinburg, 620219, Russia

18 06 2014

7 6 1763 1776

2014

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The isotopic composition of atmospheric water vapour at the land surface has been continuously monitored at the Kourovka astronomical observatory in western Siberia (57.037° N, 59.547° E; 300 m a.s.l.) since April 2012. These measurements provide the first record of δD, δ18O and d-excess in this region. Air was sampled at 8 m height within a forest clearing. Measurements were made with a wavelength-scanned cavity ring-down spectroscopy analyzer (Picarro L2130-i). Specific improvements of the measurement system and calibration protocol have been made to ensure reliable measurements at low humidity during winter. The isotopic measurements conducted till August 2013 exhibit a clear seasonal cycle with maximum δD and δ18O values in summer and minimum values in winter. In addition, considerable synoptic timescale variability of isotopic composition was observed with typical variations of 50–100&permil; for δD, 10–15&permil; for δ18O and 2–8&permil; for d-excess. The strong correlations between δD and local meteorological parameters (logarithm of humidity and temperature) are explored, with a lack of dependency in summer that points to the importance of continental recycling and local evapotranspiration. The overall correlation between δD and temperature is associated with a slope of 3&permil; °C−1. Large d-excess diurnal variability was observed during summer with up to 30&permil; decrease during the night and the minima manifested shortly after sunrise. Two dominant diurnal cycle patterns for d-excess differing by the magnitude of the d-excess decrease (21&permil; and 7&permil;) and associated patterns for meteorological observations have been determined. The total uncertainty of the isotopic measurements was quantified as 1.4–11.2&permil; for δD, 0.23–1.84&permil; for δ18O and 2.3–18.5&permil; for d-excess depending on the humidity.

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