Seasonal study of methane and nitrous oxide in the coastal waters of the southern Baltic Sea
Seasonal study of methane and nitrous oxide in the coastal waters of the southern Baltic Sea
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DOI：
10.1006/ecss.1998.0397
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发表时间：
1998-12-01
影响因子：
2.8
通讯作者：
Andreae, MO
中科院分区：
文献类型：
--
作者：
Bange, HW;Dahlke, S;Andreae, MO
在1994 ~ 1997年的5次观测中，测定了包括奥得河口西部（波罗的海南部）在内的博登水域独特的沿海生态系统中大气和溶解甲烷（CH4）和氧化亚氮（N2O）的含量。CH4饱和度在105 ~ 15 500%范围内表现出较大的时空变异性，9月最大，12月最小。N2O饱和度在91 ~ 312%之间，3月份达到最大值。两种气体的浓度只在靠近Peene河口的奥得河口西部观察到。因此，我们得出结论，所调查的博登水体中CH4和N2O的分布与Peene河径流直接或间接相关，而与奥得河无关。我们对博登水域每年向大气排放的CH4的估计表明，波罗的海对总CH4排放的贡献很大（约17%）。相比之下，博登水域只是大气中N2O的一个小来源。沉积物浆体实验估算的CH4产速率显示出显著的空间变异性，表明产甲烷活动与表层沉积物中醋酸盐消耗有关。沉积CH4的产生可能取决于有机质堆积量的不同。(C) 1998学术出版社。
Atmospheric and dissolved methane (CH4) and nitrous oxide (N2O) were measured in the unique coastal ecosystem of the Bodden waters, including the western Oder estuary, (southern Baltic Sea) during five campaigns between 1994 and 1997. The CH4 saturations, ranging from 105-15 500%, showed great spatial and temporal variability with maximum values in September and minimum values in December. The N2O saturations were in the range of 91-312% with a maximum in March. Enhanced concentrations of both gases were observed only in the western Oder estuary near the mouth of the Peene River. Thus, we conclude that the distributions of CH4 and N2O in the investigated Bodden waters are, directly or indirectly, linked to the Peene River runoff and not to the Oder River. Our estimate of the annual CH4 emissions from the Bodden waters to the atmosphere indicates a significant contribution (c. 17%) to the overall CH4 emissions from the Baltic Sea. In contrast, the Bodden waters represent only a small source for atmospheric N2O.CH4 production rates estimated from sediment slurry experiments revealed a significant spatial variability and indicated that methanogenic activity was related to acetate consumption in the surface sediment layer. Sedimentary CH4 production might depend on different amounts of accumulation of organic material. (C) 1998 Academic Press.