期刊
AGRICULTURAL AND FOREST METEOROLOGY
卷 232, 期 -, 页码 265-278出版社
ELSEVIER
DOI: 10.1016/j.agrformet.2016.08.003
关键词
Nighttime CO2 flux correction; CO2 advection; Forest hill slope; Eddy covariance measurement; Information flow; Dynamical process network
资金
- Korea Meteorological Administration Research and Development Program
- Weather Information Service Engine (WISE) project [KMA-2012-0001-A]
- National Science Foundation [EF-1241960]
- Emerging Frontiers
- Direct For Biological Sciences [1734487] Funding Source: National Science Foundation
In hilly terrain affected by drainage flow, the horizontal advection of CO2 makes it difficult to accurately observe the net ecosystem exchange of CO2 by the eddy covariance technique. Downslope drainage can result in an overestimation of respiration at the bottom of a hill slope and an underestimation at the top, resulting in discrepancies among different flux corrections using filters based on the friction velocity, light response curve, and timing of advection. Vertical profiles of the CO2 concentration from the ground to above the canopy were measured along with above-canopy EC flux measurements at the top and bottom of a hill slope at the Gwangneung KoFlux sites from 2008 to 2010. To infer the timing, direction, temporal scale, and structure of CO2 advection from uphill to downhill, we constructed an information flow dynamical process network (DPN) based on the observed multi-level CO2 concentrations. A site specific quality control filter was developed to eliminate data strongly affected by CO2 advection, which identifies the observations when strong downslope information flow exists in the DPN. This site-specific filter considerably reduced the discrepancies among different traditional flux corrections. This research provides a method for the general characterization of advection using information flow, and application of the method as a site-specific filter for eddy covariance observations in hilly and complex terrain. (C) 2016 Elsevier B.V. All rights reserved.
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