Evolution of atmospheric carbon dioxide concentration at different temporal scales recorded in a tall forest
Evolution of atmospheric carbon dioxide concentration at different temporal scales recorded in a tall forest
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高大森林记录的不同时间尺度大气二氧化碳浓度的演变
DOI：
10.1016/j.atmosenv.2012.07.013
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发表时间：
2012-12
影响因子：
5
通讯作者：
Jiabing Wu, Yanli Jing, Dexin Guan, Hong Yang
中科院分区：
文献类型：
--
作者：
Jiabing Wu, Yanli Jing, Dexin Guan, Hong Yang
了解特定生态系统的CO2随时间的演变，可以提供更多的了解大气CO2的变化。2003 - 2010年，利用红外光谱仪对一片温带古老森林的大气CO2浓度进行了连续观测。结果表明，CO2的日变化和季节变化主要受植被活动的影响，而夜间弱湍流混合则是CO2在冠层下积累的主要原因。其结果是，在白天和夜间的林分CO2浓度变化很大。月平均值表现出的季节变化的主要特点是在12月和7月至8月期间的最低值，与平均季节振幅（最小和最大月平均值的差异）为60.5 ppmv。通过对月平均值拟合一个调和模型，估计年平均CO2浓度的线性增加趋势为1.7 ppmv yr− 1，季节周期的幅度为0.58 ppmv yr− 1。年平均CO2浓度的上升趋势可能归因于研究期间全球CO2排放量的急剧增加。这项研究还发现，分层的CO2浓度低于树冠层在夜间很容易被打乱后，日出，这表明，森林地面植物是不是，如以前所假设的，暴露于显着更高的CO2浓度比正常的大气浓度。
Understanding the temporal evolution of CO2over specific ecosystems can provide additional insight into atmospheric CO2variability. From 2003 to 2010, CO2ambient concentrations in an old-growth temperate forest were measured continuously by using an infrared analyzer. The results show that daily cycle and seasonal variation of CO2were mostly dominated by vegetation activity, whereas the weak turbulent mixing at night contributed frequently to CO2build-up below the canopy. As a result, CO2concentrations changed considerably during daytime and nighttime in the forest stand. The monthly means exhibited a seasonal variation characterized by a primary peak in December and a minimum during July to August, with an average seasonal amplitude (the difference of minimum and maximum monthly means) of 60.5 ppmv. By fitting a harmonic model to the monthly means, linear increase trends of 1.7 ppmv yr−1in the annual mean CO2concentrations and 0.58 ppmv yr−1in the amplitude of the seasonal cycle were estimated. The upward trend of annual mean CO2concentration may be attributed to the dramatic global increase in CO2emissions during the study period. This study also found that the stratification of CO2concentrations below the canopy during nighttime was easily disrupted after sunrise, which suggests that forest floor plants are not, as previous assumed, exposed to significantly greater CO2concentrations than the normal atmospheric concentrations.
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影响因子：
13.5
作者：
S. Running;D. Baldocchi;D. Turner;S. Gower;P. Bakwin;K. Hibbard
通讯作者：
S. Running;D. Baldocchi;D. Turner;S. Gower;P. Bakwin;K. Hibbard
影响因子：
56.9
作者：
Levitus, S;Antonov, JI;Broccoli, AJ
通讯作者：
Broccoli, AJ
DOI：
--
发表时间：
2007
期刊：
--
影响因子：
--
作者：
Georg Beck;Meijer
通讯作者：
Georg Beck;Meijer
影响因子：
--
作者：
G. Pearman;P. Hyson
通讯作者：
G. Pearman;P. Hyson
影响因子：
6.2
作者：
Guan, De-Xin;Wu, Jia-Bing;Jin, Chang-Jie
通讯作者：
Jin, Chang-Jie