Determining the contribution of vertical advection to the net ecosystem exchange at Hyytiälä forest, Finland
Determining the contribution of vertical advection to the net ecosystem exchange at Hyytiälä forest, Finland
复制标题
确定垂直平流对芬兰 Hyytiälä 森林净生态系统交换的贡献
DOI：
10.1111/j.1600-0889.2007.00306.x
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
T. Vesala
中科院分区：
文献类型：
--
作者：
I. Mammarella;P. Kolari;J. Rinne;P. Keronen;J. Pumpanen;T. Vesala
In nighttime the importance of advection processes to full carbon balance estimated by micrometeorological methods is pronounced. The vertical advection needs the determination of mean vertical velocity which can be obtained from planar fitting, which is the determination of mean local streamline coordinates based on the statistics of the wind field measured over long periods. We tested the utilization of planar-fitting based vertical advection using long-term eddy covariance and CO2 concentration gradient data at SMEAR II field station (Hyytiålå, Southern Finland). The vertical-advection corrected carbon balance, without any friction velocity filtering, agrees very well with those obtained by filtering and gap-filling procedure, and those by chambers and ecosystem model. Although no direct measurements for horizontal advection is available, the results indicate minor significance of horizontal advection in the studied cases.
