continuous measurements of atmospheric water vapour isotopes in western siberia (kourovka)
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2014
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Abstract
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‰ for δD, 10–15‰ for
δ18O and 2–8‰ 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‰ °C−1. Large d-excess diurnal variability
was observed during summer with up to 30‰ 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‰ and 7‰) and associated patterns for
meteorological observations have been determined. The total uncertainty of the isotopic measurements
was quantified as 1.4–11.2‰ for δD, 0.23–1.84‰ for
δ18O and 2.3–18.5‰ for d-excess depending on the humidity.
| Reference Key |
bastrikov2014atmosphericcontinuous
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|---|---|
| Authors | ;V. Bastrikov;H. C. Steen-Larsen;V. Masson-Delmotte;K. Gribanov;O. Cattani;J. Jouzel;V. Zakharov |
| Journal | bioorganic & medicinal chemistry |
| Year | 2014 |
| DOI |
10.5194/amt-7-1763-2014
|
| URL | |
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