Diurnal dynamics of CH4 from a boreal peatland during snowmelt
Diurnal dynamics of CH4 from a boreal peatland during snowmelt
复制标题
融雪期间北方泥炭地 CH4 的日动态
DOI：
10.1111/j.1600-0889.2010.00455.x
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
M. Wilmking
中科院分区：
文献类型：
--
作者：
Gazovic;Kutzbach;Schreiber;M. Wilmking
泥炭地是甲烷（CH4）的主要天然来源之一，但在冬季、秋季和高度动态的春季解冻期，其流出量的量化尚不确定。在这里，我们报告了在俄罗斯西北部北部泥炭地的积雪融化期间使用涡流协方差技术测量的ch4通量（FCH4）的明显日变化。在冬季背景排放~ 0.5mgm−2h−1之后，4月21日至5月3日ch4通量的强烈日变化明显受地表温度（Tsur）和近地表湍流的变化控制，如摩擦速度（u*）所示。夜间ch4通量为~ 0.8mgm−2h−1，高峰期ch4通量为~ 3mgm−2h−1。首先，由于地表温度在白天0°C和夜间0°C之间振荡，在湿泥炭地微形态上观测到的冰层冻融循环似乎强烈地影响了日变率。一旦冰层融化，风速的增加似乎增加了ch4的流出，可能是由于增加了水面的混合。显然，在高动态春融期，多种物理因素共同影响着ch4外排的气体输运过程。
Peatlands are one of the major natural sources of methane (CH4), but the quantification of efflux is uncertain especially during winter, fall and the highly dynamic spring thaw period. Here, we report pronounced diurnal variations in CH4fluxes (FCH4), measured using the eddy-covariance technique during the snow-thawing period at a boreal peatland in north-western Russia. Following the background winter emission of ∼0.5mgm−2h−1, strong diurnal variability in CH4fluxes from 21 April to 3 May was apparently controlled by changes in surface temperature (Tsur) and near-surface turbulence as indicated by the friction velocity (u*).CH4fluxeswere∼0.8mgm−2h−1during night and∼3mgm−2h−1during peak efflux. Primarily, the freeze-thaw cycle of an ice layer observed at the wet peatland microforms due to surface temperatures oscillating between 0◦C during the days and 0◦C during the nights appeared to strongly influence diurnal variability. Once the ice layer was melted, increases in wind speed seemed to enhance CH4efflux, possibly by increased mixing of the water surface. Apparently, a combination of physical factors is influencing the gas transport processes of CH4efflux during the highly dynamic spring thaw period.
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影响因子：
4.9
作者：
Becker;Kutzbach;Forbrich;Schneider;M. Wilmking
通讯作者：
M. Wilmking
影响因子：
11.6
作者：
C. Wille;L. Kutzbach;T. Sachs;D. Wagner;E. Pfeiffer
通讯作者：
C. Wille;L. Kutzbach;T. Sachs;D. Wagner;E. Pfeiffer
甲烷排放量的昼夜变化与瑞典酸性沼泽地的地下水位、土壤温度、气候和植被覆盖率的关系
影响因子：
4
作者：
MIKKELA, C;SUNDH, I;NILSSON, M
通讯作者：
NILSSON, M
温带贫瘠沼泽地冰下和雪中的冬季甲烷动态
影响因子：
3.8
作者：
R. Melloh
通讯作者：
R. Melloh
DOI：
10.1098/rsta.1995.0032
发表时间：
1995-05-16
影响因子：
5
作者：
CLYMO, RS;PEARCE, DME
通讯作者：
PEARCE, DME