Deriving Daytime Variables From the AmeriFlux Standard Eddy Covariance Data Set
- Berkeley Water Center. Berkeley, CA (United States); Microsoft. San Francisco, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Berkeley Water Center. Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Univ. of Virginia, Charlottesville, VA (United States)
A gap-filled, quality assessed eddy covariance dataset has recently become available for the AmeriFluxnetwork. This dataset uses standard processing and produces commonly used science variables. This shared dataset enables robust comparisons across different analyses. Of course, there are many remaining questions. One of those is how to define 'during the day' which is an important concept for many analyses. Some studies have used local time — for example 9am to 5pm; others have used thresholds on photosynthetic active radiation (PAR). A related question is how to derive quantities such as the Bowen ratio. Most studies compute the ratio of the averages of the latent heat (LE) and sensible heat (H). In this study, we use different methods of defining 'during the day' for GPP, LE, and H. We evaluate the differences between methods in two ways. First, we look at a number of statistics of GPP. Second, we look at differences in the derived Bowen ratio. Our goal is not science per se, but rather informatics in support of the science.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Computational Research Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 1026798
- Report Number(s):
- LBNL-4737E-Poster; TRN: US201121%%103
- Resource Relation:
- Conference: American Geophysical Union, San Francisco, CA, 12/6/2008
- Country of Publication:
- United States
- Language:
- English
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