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| Titel |
Coupling Flux Towers and Networks with Proximal and Remote Sensing Data: New Tools to Collect and Share Time-Synchronized Hourly Fluxes |
| VerfasserIn |
George Burba, Tom Avenson, Andreas Burkart, John Gamon, Kaiyu Guan, Tommaso Julitta, Gilberto Pastorello, Karolina Sakowska |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250137961
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| Publikation (Nr.) |
 EGU/EGU2017-838.pdf |
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| Zusammenfassung |
| Multiple hundreds of flux towers are presently operational as standalone projects
and as parts of larger networks. However, the vast majority of these towers do not
allow straight-forward coupling with satellite data, and even fewer have optical
sensors for validation of satellite products and upscaling from field to regional
levels.
In 2016, new tools to collect, process, and share time-synchronized flux data from
multiple towers were developed and deployed globally. Originally designed to automate site
and data management, these new tools can also be effective in coupling tower data with
satellite data due to the following present capabilities:
Fully automated FluxSuite
system combines hardware, software and web-services, and does not require an
expert to run it
It can be incorporated into a new flux station or added to a present station, using
weatherized remotely-accessible microcomputer, SmartFlux2
It utilizes EddyPro software to calculate fully-processed fluxes and footprints in
near-realtime, alongside radiation, optical, weather and soil data
All site data are merged into a single quality-controlled file timed using PTP time
protocol
Data from optical sensors can be integrated into this complete dataset via
compatible dataloggers
Multiple stations can be linked into time-synchronized network with automated
reports and email alerts visible to PIs in real-time
Remote sensing researchers without stations can form “virtual networks” of
stations by collaborating with tower PIs from different physical networks
The present system can then be utilized to couple ground data with satellite data via the
following proposed concept:
GPS-driven PTP protocol will synchronize instrumentation within the station,
different stations with each other, and all of these to satellite data to precisely
align optical and flux data in time
Footprint size and coordinates computed and stored with flux data will help
correctly align footprints and satellite motion to precisely align optical and flux
data in space
Current flux towers can be augmented with ground optical sensors and use
standard routines to deliver continuous products (e.g. SIF, PRI, NDVI, etc.) based
on automated field spectrometers (e.g., FloX and RoX, etc.) and other optical
systems
Schedule can be developed to point ground optical sensor into the footprint, or
to run leaf chamber measurements in the footprint, at the same time with the
satellite or UAV above the footprint
Full snapshot of the satellite pixel can then be constructed including leaf-level,
ground optical sensor, and flux measurements from the same footprint area
closely coupled with the satellite measurements to help interpret satellite data,
validate models, and improve upscaling
Several dozens of new towers already operational globally can be readily adapted for the
proposed concept. In addition, over 500 active traditional towers can be updated to
synchronize their data with satellite measurements. This presentation will show how
FluxSuite system is used by major networks, and describe the concept of how this approach
can be utilized to couple satellite and tower data. |
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