Methane and carbon dioxide fluxes and their regional scalability for the European Arctic wetlands during the MAMM project in summer 2012
Methane and carbon dioxide fluxes and their regional scalability for the European Arctic wetlands during the MAMM project in summer 2012
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DOI：
10.5194/acp-14-13159-2014
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发表时间：
2014-01-01
影响因子：
6.3
通讯作者：
Pyle, J.
中科院分区：
文献类型：
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作者：
O'Shea, S. J.;Allen, G.;Pyle, J.
2012年7月，作为北极甲烷和其他温室气体：测量、过程研究和建模（MAMM）实地活动的一部分，在芬诺斯堪的纳维亚地貌（北纬67-69.5度，东经20-28度）上空记录了甲烷（CH 4）、二氧化碳（CO2）和边界层热力学的机载和地基测量结果。利用这些空中测量数据和一个简单的边界层箱模型，计算出区域尺度（类似于100公里）的净通量为1.2 +/- 0.5 mg CH 4 h（-1）m（-2）和-350 +/- 143 mg CO2 h（-1）m（-2）。发现这些气载通量与当地季节平均地面箱（1.3 +/- 1.0 mg CH 4 h（-1）m（-2））和涡度协方差（1.3 +/- 0.3 mg CH 4 h（-1）m（-2）和-309 +/- 306 mg CO2 h（-1）m（-2））通量测量结果相对一致。飞机产生的通量的内部一致性，加上一个很好的统计比较与当地的季节性平均地面测量的Fennoscandia宽幅显示出潜在的可扩展性，这种本地化的测量区域尺度的代表性。还比较了MAMM活动区域内JULES（联合王国陆地环境模拟器）和HYBRID 8陆面模式的长期区域CH 4气候。夏季平均每小时排放通量输出2012年（7月至8月）为0.084 mg CH 4 h（-1）m（-2）（JULES模型的最小值为0.0，最大值为0.21 mg CH 4 h（-1）m（-2）），（HYBRID 8的最小值为0.0008，最大值为1.53 mg CH 4 h（-1）m（-2））。根据这些观察，这两个模型被发现显着低估了CH 4排放通量在这一地区，这是与预测不足的模型所产生的湿地范围。
Airborne and ground-based measurements of methane (CH4), carbon dioxide (CO2) and boundary layer thermodynamics were recorded over the Fennoscandian landscape (67-69.5 degrees N, 20-28 degrees E) in July 2012 as part of the MAMM (Methane and other greenhouse gases in the Arctic: Measurements, process studies and Modelling) field campaign. Employing these airborne measurements and a simple boundary layer box model, net regional-scale ( similar to 100 km) fluxes were calculated to be 1.2 +/- 0.5 mg CH4 h(-1) m(-2) and -350 +/- 143 mg CO2 h(-1) m(-2). These airborne fluxes were found to be relatively consistent with seasonally averaged surface chamber (1.3 +/- 1.0 mg CH4 h(-1) m(-2)) and eddy covariance (1.3 +/- 0.3 mg CH4 h(-1) m(-2) and -309 +/- 306 mg CO2 h(-1) m(-2)) flux measurements in the local area. The internal consistency of the aircraft-derived fluxes across a wide swath of Fennoscandia coupled with an excellent statistical comparison with local seasonally averaged ground-based measurements demonstrates the potential scalability of such localised measurements to regional-scale representativeness. Comparisons were also made to longerterm regional CH4 climatologies from the JULES (Joint UK Land Environment Simulator) and HYBRID8 land surface models within the area of the MAMM campaign. The average hourly emission flux output for the summer period (July August) for the year 2012 was 0.084 mg CH4 h(-1) m(-2) (minimum 0.0 and maximum 0.21 mg CH4 h(-1) m(-2)) for the JULES model and 0.088 mg CH4 h(-1) m(-2) (minimum 0.0008 and maximum 1.53 mg CH4 h(-1) m(-2)) for HYBRID8. Based on these observations both models were found to significantly underestimate the CH4 emission flux in this region, which was linked to the under-prediction of the wetland extents generated by the models.