Saisonale Variation von Deuterium und Sauerstoff-18 in Luftfeuchte und Niederschlag über Antarktika
| Autor: | G. Schwarz, Peter Kowski, Hartwig Gernandt |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Oxygen-18
010504 meteorology & atmospheric sciences δ18O Sampling (statistics) 010502 geochemistry & geophysics Snow 01 natural sciences Isotopic composition Inorganic Chemistry 13. Climate action Climatology Environmental Chemistry Environmental science Precipitation Water vapor 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Isotopes in Environmental and Health Studies. 34:159-168 |
| ISSN: | 1477-2639 1025-6016 |
| DOI: | 10.1080/10256019708036343 |
| Popis: | D and (18)O distributions were investigated in Antarctic precipitation (falling snow) and in water vapour to study their dependance on season and sampling site. Long-term sampling at the former German Georg Forster Station during 1978-93 and at the Japanese Syowa Station during 1994-97 allow conclusions about the present seasonal isotopic variations in the water inflow to Antarctica. The δD and δ(18)O values of precipitation at these East Antarctic coastal stations were compared with corresponding data from the West Antarctic Georg von Neumayer and Halley stations. The monthly means of these long-term data sets show typical hysteresis-like seasonal patterns of isotopic composition. Significant time lags exist regarding station temperatures, while water vapour δD values do not show such hysteresis patterns. Here, half-yearly and even quarter-yearly time components were found by Fourier analysis. Attempts were made to describe the variation in δD and δ(18)O values of water vapour and precipitation as well as in the resulting deuterium excess by the mixed cloud isotopic model (MCIM) of Ciais and Jouzel. |
| Databáze: | OpenAIRE |
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