نتایج جستجو برای: eddy covariance
تعداد نتایج: 44832 فیلتر نتایج به سال:
The eddy covariance (EC) technique is a powerful tool for measuring atmospheric exchange rates that was recently adapted by biogeochemists to measure aquatic oxygen fluxes. A review of biogeochemical EC literature revealed the majority studies were conducted in shallow waters where waves likely present, and biased sensor turbulence measurements. This identified larger measurement heights shifte...
The eddy covariance technique is a widely used and accepted method to quantify ecosystem-scale mass and energy fluxes. Eddy covariancemeasurements of evaporation, also known as evapotranspiration, are used to determine local, regional and global water budgets, calibrate and validate land surface models, and acquire understanding of ecosystem processes. This paper assesses the accuracy of eddy c...
Better quantification of isotope ratios of atmosphere-ecosystem exchange of CO2 could substantially improve our ability to probe underlying physiological and ecological mechanisms controlling ecosystem carbon exchange, but the ability to make long-term continuous measurements of isotope ratios of exchange fluxes has been limited by measurement difficulties. In particular, direct eddy covariance...
An intercomparison study of two methods for estimating forest soil CO2 efflux was conducted during a 3-week period in summer. An empirical model established from nearly 2 years of chamber measurements predicted that the soil CO2 efflux ranged from 1.2 to 1.4 mmol m−2 s−1. This small range was due to the lack of variability in the model parameters (soil temperature and moisture) during the study...
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