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

Bastrikov, Vladislav; Steen‐Larsen, Hans Christian; Masson‐Delmotte, Valérie; Gribanov, K. G.; Cattani, O.; Jouzel, Jean; Захаров, В. И.

doi:10.5194/amt-7-1763-2014

Cited by 54 publications

(78 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4), with slopes lower than eight, a value attributed to thermodynamic equilibrium, as it approximately represents the average ratio between D and 18 O liquid-vapour equilibrium fractionation. Such low slopes have also been observed in atmospheric vapour from Hawaii (7.02 ), Greenland (between 6.47 and 7.44 (Steen-Larsen et al, 2013)), western Siberia (between 5.6 and 7.7 (Bastrikov et al, 2014)), and in North America (7.5 ). The previously described shift in d during Rayleigh-type rainout, due to the nonlinearity in the deuterium excess definition, is not sufficient to explain these low slopes, and non-equilibrium processes such as evaporation are also probably involved (Gibson et al, 2008).…”

Section: Regional Isotopic Signaturesmentioning

confidence: 87%

Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

2015

View full text Add to dashboard Cite

Abstract. Stable isotopes of water vapour represent a powerful tool for tracing atmospheric vapour origin and mixing processes. Laser spectrometry recently allowed high timeresolution measurements, but despite an increasing number of experimental studies, there is still a need for a better understanding of the isotopic signal variability at different time scales. We present results of in situ measurements of δ 18 O and δD during 36 consecutive days in summer 2011 in atmospheric vapour of a Mediterranean coastal wetland exposed to high evaporation (Camargue, Rhône River delta, France). The mean composition of atmospheric vapour (δ v ) is δ 18 O = −14.66 ‰ and δD = −95.4 ‰, with data plotting clearly above the local meteoric water line on a δ 18 O-δD plot, and an average deuterium excess (d) of 21.9 ‰. Important diurnal d variations are observed, and an hourly time scale analysis is necessary to interpret the main processes involved in its variability. After having classified the data according to air mass back trajectories, we analyse the average daily cycles relating to the two main meteorological situations, i.e. air masses originating from North Atlantic Ocean and Mediterranean Sea. In both situations, we show that diurnal fluctuations are driven by (1) the influence of local evaporation, culminating during daytime, and leading to an increase in absolute water vapour concentration associated to a δ v enrichment and d increase; (2) vertical air mass redistribution when the Planetary Boundary Layer collapses in the evening, leading to a d decrease, and (3) dew formation during the night, producing a δ v depletion with d remaining stable. Using a twocomponent mixing model, we calculate the average composition of the locally evaporated vapour (δ E ). We find higher d (E) under North Atlantic air mass conditions, which is consistent with lower humidity conditions. We also suggest that δ v measured when the PBL collapses is the most representative of a regional signal. Strong, cold and dry winds coming from the north bring an isotopically depleted vapour, while light, warm and wet winds coming from the south bring an isotopically enriched vapour. Under northern conditions, a strong advection rate dilutes the contribution of the locally evaporated vapour (δ E ) to the ambient moisture (δ v ). The higher d values measured under northern conditions, compared to the Mediterranean situation, thus results from the combination of a higher d in both local and regional vapour. This depiction of typical daily cycles of water vapour isotopic composition can be used as a framework for further quantitative analyses of vapour sources during specific days.

show abstract

Section: Regional Isotopic Signaturesmentioning

confidence: 87%

Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

2015

View full text Add to dashboard Cite

show abstract

“…However, on the northern Tibetan Plateau, the δ 18 O composition of water vapour and precipitation correlated positively with tem- perature (Yin et al, 2008). A positive correlation between the isotope record of water vapour and temperature (T ) was also found at Heidelberg (Germany), western Siberia, southern Greenland, and Minnesota (USA) (respectively, SchochFischer et al, 1984;Bastrikov et al, 2014;Bonne et al, 2014;Welp et al, 2008). Clearly, the relationships between δ 18 O-T and δ 18 O-RH at our station differ from those at other stations.…”

Section: The Effects Of Meteorological and Environmental Factors On δmentioning

confidence: 92%

Simultaneous monitoring of stable oxygen isotope composition in water vapour and precipitation over the central Tibetan Plateau

Tian

et al. 2015

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. This study investigated daily δ 18 O variations of water vapour (δ 18 O v ) and precipitation (δ 18 O p ) simultaneously at Nagqu on the central Tibetan Plateau for the first time. Data show that the δ 18 O tendencies of water vapour coincide strongly with those of associated precipitation. The δ 18 O values of precipitation affect those of water vapour not only on the same day, but also for the following several days. In comparison, the δ 18 O values of local water vapour may only partly contribute to those of precipitation. During the entire sampling period, the variations of δ 18 O v and δ 18 O p at Nagqu did not appear dependent on temperature, but did seem significantly dependent on the joint contributions of relative humidity, pressure, and precipitation amount. In addition, the δ 18 O changes in water vapour and precipitation can be used to diagnose different moisture sources, especially the influences of the Indian monsoon and convection. Moreover, intense activities of the Indian monsoon and convection may cause the relative enrichment of δ 18 O p relative to δ 18 O v at Nagqu (on the central Tibetan Plateau) to differ from that at other stations on the northern Tibetan Plateau. These results indicate that the effects of different moisture sources, including the Indian monsoon and convection currents, need be considered when attempting to interpret paleoclimatic records on the central Tibetan Plateau.

show abstract

“…However, at low humidity levels (<1500 ppmv) the instrument reveals a strong increase in uncertainty estimated to be 5.6 ‰ for δD and 0.92 ‰ for δ 18 O at 1000-1500 ppmv and 11.2 ‰ for δD and 1.84 ‰ for δ 18 O at 500-1000 ppmv (Bastrikov et al, 2014). The measurements below 500 ppmv are considered to be beyond the instrument measuring capabilities and are not used in the analysis.…”

Section: Water Vapor Measurements At Kourovkamentioning

confidence: 99%

To what extent could water isotopic measurements help us understand model biases in the water cycle over Western Siberia

et al. 2014

Self Cite

View full text Add to dashboard Cite

Abstract. We evaluate the isotopic composition of water vapor and precipitation simulated by the LMDZ (Laboratoire de Météorologie Dynamique-Zoom) GCM (General Circulation Model) over Siberia using several data sets: TES (Tropospheric Emission Spectrometer) and GOSAT (Greenhouse gases Observing SATellite) satellite observations of tropospheric water vapor, GNIP (Global Network for Isotopes in Precipitation) and SNIP (Siberian Network for Isotopes in Precipitation) precipitation networks, and daily, in situ measurements of water vapor and precipitation at the Kourovka site in Western Siberia. LMDZ captures the spatial, seasonal and daily variations reasonably well, but it underestimates humidity (q) in summer and overestimates δD in the vapor and precipitation in all seasons. The performance of LMDZ is put in the context of other isotopic models from the SWING2 (Stable Water Intercomparison Group phase 2) models. There is significant spread among models in the simulation of δD, and of the δD-q relationship. This confirms that δD brings additional information compared to q only. We specifically investigate the added value of water isotopic measurements to interpret the warm and dry bias featured by most GCMs over mid and high latitude continents in summer. The analysis of the slopes in δD-q diagrams and of processes controlling δD and q variations suggests that the cause of the dry bias could be either a problem in the large-scale advection transporting too much dry and warm air from the south, or too strong boundary-layer mixing. However, δD-q diagrams using the available data do not tell the full story. Additional measurements would be needed, or a more sophisticated theoretical framework would need to be developed.

show abstract

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

Cited by 54 publications

References 46 publications

Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

Simultaneous monitoring of stable oxygen isotope composition in water vapour and precipitation over the central Tibetan Plateau

To what extent could water isotopic measurements help us understand model biases in the water cycle over Western Siberia

Contact Info

Product

Resources

About