Twenty Years of Atmospheric 14Co2 Observations At Schauinsland Station, Germany
Twenty Years of Atmospheric 14Co2 Observations At Schauinsland Station, Germany
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德国绍因斯兰站 20 年大气 14Co2 观测
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
B. Kromer
中科院分区：
文献类型：
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作者：
I. Levin;B. Kromer
本文介绍并讨论了绍因斯兰（48°N，8°E，海拔1205米，黑森林，德国南部）大陆背景站14 CO2的准连续长期观测。1977 ~ 1996年大气14 CO2浓度的稳定下降可用单指数函数描述，e折叠时间为（16.3 ± 0.2）年。夏季（5月至8月）绍因斯兰大气中14 CO2的平均值与在绍因斯兰站点附近生长的树木的单个年轮上进行的测量值相比，在Δ 14 C = ±4‰以内。如果与在特内里费岛伊萨尼亚进行的大气14 CO2海洋背景测量相比，这两个数据集都略微减少了5‰。这是由于化石燃料CO2排放对欧洲大陆以及北方半球中纬度地区的影响。对绍因斯兰样本的δ 13 C分析表明，平均季节变化幅度为±0.4‰，这是由大气-生物圈交换引起的，从1977年到1996年，δ 13 C平均下降=-0.017 ‰ yr-1。这一趋势主要是由于大气中化石燃料CO2的数量增加，13 C/12 C比率减少，与北方中高纬度其他台站测量的趋势相比情况良好。
We present and discuss quasi-continuous long-term 14CO2 observations from the continental background station Schauinsland (48°N, 8°E, 1205 m asl, Black Forest, southern Germany). The observed steady decline of atmospheric 14CO2 from 1977 to 1996 can be described by a single exponential function with an e-folding time of (16.3 ± 0.2) yr. Summer means (May to August) in atmospheric 14CO2 at Schauinsland compare within Δ14C = ±4‰ with measurements made on individual rings from a tree grown in the near vicinity of the Schauinsland site. Both data sets are slightly depleted by up to 5‰ if compared to maritime background measurements of atmospheric 14CO2 made at Izaña, Tenerife. This is due to the influence of fossil fuel CO2 emissions over the European continent as well as generally in mid latitudes of the Northern Hemisphere. δ13C analyses from the Schauinsland samples show mean seasonal variations with an amplitude of ±0.4‰, caused by atmosphere-biosphere exchange, and a mean decrease from 1977 to 1996 of δ13C = −0.017‰ yr−1. This trend is mainly due to an increasing quantity of fossil fuel CO2 in the atmosphere, depleted in 13C/12C ratio, and compares well to trends measured at other stations in mid-to-high northern latitudes.