Abstract
Based on isotope and meteorology data at Vienna station from 1972 to 2014 provided by GNIP, the average monthly and annual hydrogen and oxygen stable isotopic compositions and main factors were analyzed by using various trend analysis, periodic analysis and correlation analysis methods. The monthly mean isotopic compositions change slightly, reflecting the fact that although Vienna is affected by the maritime climate and the continental climate, the former impact is more significant. The slope and intercept of the LMWL in Vienna changed significantly from October to March, indicating that it was affected by alternating effects of the two climates. The annual mean isotopes show a trend of enrichment, and it has an obvious temperature effect, but the rainfall amount effect does not exist, and no simple linear relationship was found between isotopes and vapor pressure. The annual mean isotopes also show the periodic variation characteristics with scales such as 9-16 years and 18~29 years, and it is concluded that the isotope values will be enriched after 2011 at the scale 22 years. The multivariate regression relationship established by δD and δ18O with three climate parameters of temperature, precipitation and vapor pressure can quantitatively estimate the missing value in isotopic data.
Highlights
The stable isotopes in natural water are widely used to study the global hydrological cycle and climate change [1,2,3]
The maximum monthly mean hydrogen and oxygen isotopes in precipitation at Vienna station mainly occur in July to August of each year, and the minimum mainly occur in December to February of each year, which is consistent with the results obtained from Fig. 1
Compared with the global hydrogen and oxygen isotopes in precipitation, the δ value in Vienna is lower, indicating that the moisture sources is mainly marine air mass, and Vienna is mainly controlled by oceanic climate throughout the year
Summary
The stable isotopes (δD and δ18O) in natural water are widely used to study the global hydrological cycle and climate change [1,2,3]. Precipitation is an important part of the natural water cycle, and its hydrogen and oxygen stable isotope relationships play a dominant role in the isotope relationship of the hydrological system. Domestic and foreign scholars used the composition of hydrogen and oxygen stable isotopes in precipitation to reveal the moisture source in precipitation [5,6], to explore the influence of monsoon activity on the temporal and spatial distribution of precipitation isotopes [7,8] and analyzed the precipitation law in the region. The composition of stable isotopes in atmospheric precipitation varies greatly with time and space, and the local meteoric water line (LMWL) in different regions tend to deviate from the global meteoric water line to varying degrees [10]. The International Atomic Energy Agency (IAEA) and the World Meteorological Organization (WMO) collaborated to study the temporal and spatial variations in stable isotopes and tritium in atmospheric precipitation starting in 1961 to develop a global precipitation isotope monitoring network (GNIP, the Global Network of Isotopes in Precipitation), and more than 800 precipitation sampling stations have been established around the world
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