Estimation of carbon mass fluxes over Europe using the C-Fix model and Euroflux data
Estimation of carbon mass fluxes over Europe using the C-Fix model and Euroflux data
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DOI：
10.1016/s0034-4257(02)00043-3
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发表时间：
2002-12
影响因子：
13.5
通讯作者：
Frank Veroustraete;H. Sabbe;H. Eerens
中科院分区：
文献类型：
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作者：
Frank Veroustraete;H. Sabbe;H. Eerens
欧盟资助的项目气候变化对欧洲森林的长期区域影响：影响评估和碳预算后果（LTEEF-II，ENV 4-CT 97 -0577）的目标之一是量化植被（森林）和大气之间的碳和水通量，并评估欧洲森林的碳平衡。本文介绍了在LTEEF-II项目的部分目标框架内应用C-Fix模型的结果，如欧洲大陆尺度所定义的。本文的第一部分介绍了C-Fix模型。C-Fix是一个Monteith型参数模型，由温度、辐射和吸收光合有效辐射分数驱动，最后一个变量是通过处理1997年在欧洲获得的NOAA/AVHRR数据以及1998-1999年期间同一区域的植被数据得出的。在第二部分的文件中，所获得的主要结果进行了说明，例如森林的净生态系统通量，计算本地的Euroflux CO2测量站点以及整个大陆。1997年期间在Euroflux站点进行的NEP涡度协方差测量的模型模拟进行了评估。此外，与NOAA/AVHRR数据确定的NEP之间的比较，反对NEP模拟VGT数据的基础上进行。两个数据集之间的差异高达20%。最后，用NOAA/AVHRR资料得到的1997年欧洲植被净生态效益的C-Fix估计值为2.70± 32%PgC，（P= 1015 g，%为95%置信限）。当使用1998年4月至1999年3月期间的VGT数据时，这一估计值降至2.15±43% Pg C。但是，欧洲1997年的森林净生产率估计为0.735 Pg C。沿沿着东经13°的南北样带，穿过欧洲，从北方到南方纬度，NEP和其他基本碳质量通量GPP和NPP明显增加。此外，沿着这条横断面的数值模拟与C-Fix的NEP对应以及涡度协方差NEP估计的Euroflux网站。
One of the aims of the EU funded project Long-term regional effects of climate change on European forests: impact assessment and consequences for carbon budgets (LTEEF-II, ENV4-CT97-0577) is to quantify the fluxes of carbon and water between vegetation (forests) and atmosphere and to assess the carbon balance of forests in Europe. This paper presents the results of the application of the C-Fix model within the frame of part of the objectives of the LTEEF-II project, as defined for the European continental scale. A description of the C-Fix model is presented in the first part of this paper. C-Fix is a Monteith type parametric model driven by temperature, radiation and fraction of Absorbed Photosynthetically Active Radiation (fAPAR), the last variable derived by processing NOAA/AVHRR data of 1997 acquired over Europe as well as VEGETATION (VGT) data for the same region for the period 1998–1999. In a second part of the paper, the main results obtained are described, e.g. net ecosystem fluxes for forest, calculated locally for the Euroflux CO2measurement sites as well as for the whole continent. The model simulations were evaluated with eddy covariance measurements of NEP performed during 1997 at the Euroflux sites. Moreover, a comparison between NEP determined with NOAA/AVHRR data, opposed to NEP simulations based on VGT data is performed. A difference up to 20% is obtained between both data sets. Finally A C-Fix estimate of total European vegetation NEP obtained with NOAA/AVHRR data for 1997 is 2.70±32% Pg C, (P=1015g, % is 95% confidence limit). This estimate decreases to 2.15±43% Pg C when VGT data for the period April 1998–March 1999 are used. The total forest NEP for Europe, however, is estimated at 0.735 Pg C for 1997. Along a North–South transect at 13° east, through Europe a clear increase in NEP and the other basic carbon mass fluxes GPP and NPP is modelled from northern to southern latitudes. Moreover, along this transect the values simulated with C-Fix for NEP corresponds well with the eddy covariance NEP estimates for the Euroflux sites.