俄罗斯莫斯科市降水中稳定同位素(δ2H、δ18O)的监测:2005-2014年和1970-1979年的比较

Pub Date : 2021-01-01 DOI:10.21638/spbu07.2021.405
N. N. Zykin, I. Tokarev, N. Vinograd
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引用次数: 0

摘要

利用单次降水(剔除不可靠样品后共842次)取样,研究了2005-2014年莫斯科地区大气降水中氧(δ18O)和氢(δ2H)的同位素组成。与VSEGINGEO和IVP RAS在1969-1979年为IAEA-WMO GNIP网络进行的类似研究进行了比较,当时采用累积法采集了月平均样品(主要在1975-1979年进行了61对氘和氧-18测定)。2005-2015年序列简化为1969-1979年序列的类似形式,通过最近气象站的降水量数据重新计算。结果表明,近10年来,大气降水局地线方程发生了显著变化,其初始形式为δ2H = 6.09×δ18O - 23.0‰(R2 = 0.87),目前为δ2H = 6.93×δ18O - 11.3‰(R2 = 0.944)。δ2H和δ18O平均值的耗竭也较第一个观测期有所减少,这明显反映了气候变化的过程。同时,在每个时期内,注意到按时间顺序排列的数据的近似线的负斜率(尽管相对较小)。氘过剩随季节自然变化,夏季为负值,主要是由于蒸发过程中的非平衡分馏。2005-2014年降水同位素组成的温度依赖性较1969-1979年发生了显著变化,无法通过气象观测重建过去降水组成。
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Monitoring of stable isotopes (δ2H, δ18O) in precipitations of Moscow city (Russia): comparison for 2005–2014 and 1970–1979 periods
The isotopic composition of oxygen (δ18O) and hydrogen (δ2H) of atmospheric precipitation in Moscow in 2005–2014 was studied by sampling single precipitations (a total of 842 measurements after rejection of unreliable samples). A comparison is made with similar studies carried out by VSEGINGEO and IVP RAS for the IAEA-WMO GNIP network in 1969–1979, when monthly average samples were taken by the accumulation method (61 pair determinations of deuterium and oxygen-18, mainly in 1975–1979). The 2005–2015 series is reduced to a similar form for the 1969–1979 series, recalculated through the data on the volume of precipitation at the nearest meteorological station. It was found that in the last decade there has been a significant change in the equation of the local line of meteoric waters, which for the first period had the form δ2H = 6.09×δ18O – 23.0 ‰ (R2 = 0.87), and is currently described by the relation δ2H = 6.93×δ18O – 11.3 ‰ (R2 = 0.944). There is also a decrease in depletion of the average values of δ2H and δ18O, compared with the first observation period, which apparently reflects the course of climatic changes. At the same time, within each of the periods, a negative (albeit relatively small) slope of the line of approximation of chronological data is noted. Deuterium excess naturally changes seasonally, taking negative values in summer, primarily due to non-equilibrium fractionation during evaporation. In 2005–2014, the temperature dependence of the isotopic composition of precipitation changed significantly in comparison with 1969–1979, which makes it impossible to reconstruct the composition of precipitation in the past from meteorological observations.
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