Eddy covariance flux corrections and uncertainties in long-term studies of carbon and energy exchanges
Eddy covariance flux corrections and uncertainties in long-term studies of carbon and energy exchanges
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DOI：
10.1016/s0168-1923(02)00105-3
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发表时间：
2002-12-02
影响因子：
6.2
通讯作者：
Lee, X
中科院分区：
文献类型：
--
作者：
Massman, WJ;Lee, X
本研究源于并扩展了 2000 年 5 月 30 日至 31 日在科罗拉多州博尔德举行的美国能源部主办的研讨会的讨论，该研讨会涉及与碳和能量交换的长期涡度协方差测量相关的问题和不确定性。该研讨会的组织是为了回应 1999 年 AmeriFlux 年度会议上提出的担忧，即在对涡流协方差通量估计进行光谱校正以及在校正涡流协方差 CO2 通量时缺乏能量平衡闭合时，站点之间缺乏一致性。最终，这种一致性的缺乏使得跨站点比较和全球综合变得困难和不确定。研讨会有两个主要目标：首先，强调长期涡协方差通量记录的准确性所涉及的问题；其次，为了确定解决这些问题的优先研究领域和行动，研讨会涵盖的主题包括进行光谱校正的不同方法、排水和平流等 3D 效应的影响、由于无法测量低频贡献而低估涡流协方差通量、坐标系和夜间通量测量。此外，这项研究还涵盖了研讨会上未提出的一些新的和潜在的重要问题，涉及追踪气体涡流协方差通量的密度项（Webb 等人，1980）。本文尽可能综合这些讨论，并就方法论和研究重点提出建议。由 Elsevier Science B.V. 出版
This study derives from and extends the discussions of a US DOE sponsored workshop held on 30 and 31 May, 2000 in Boulder, CO concerning issues and uncertainties related to long-term eddy covariance measurements of carbon and energy exchanges. The workshop was organized in response to concerns raised at the 1999 annual AmeriFlux meeting about the lack of uniformity among sites when making spectral corrections to eddy covariance flux estimates and when correcting the eddy covariance CO2 fluxes for lack of energy balance closure. Ultimately, this lack of uniformity makes cross-site comparisons and global synthesis difficult and uncertain. The workshop had two primary goals: first, to highlight issues involved in the accuracy of long-term eddy covariance flux records; and second, to identify research areas and actions of high priority for addressing these issues, Topics covered at the workshop include different methods for making spectral corrections, the influence of 3D effects such as drainage and advection, underestimation of eddy covariance fluxes due to inability to measure low frequency contributions, coordinate systems, and nighttime flux measurements. In addition, this study also covers some new and potentially important issues, not raised at the workshop, involving density terms to trace gas eddy covariance fluxes (Webb et al., 1980). Wherever possible, this paper synthesizes these discussions and make recommendations concerning methodologies and research priorities. Published by Elsevier Science B.V.