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Site: Twitchell Wetland West Pond

The site is a 7.4-acre restored wetland on Twitchell Island, that is managed by the California Department of Water Resources (DWR) and the U.S. Geological Survey (USGS). It forms a rectangle that is aligned east-west along the predominate wind direction of the region. In the fall of 1997, the site was permanently flooded to a depth of approximately 25 cm. The wetland was almost completely covered by cattails (Typha spp.) and tules (Schoenoplectus acutus) by the third growing season. A flux tower equipped to analyze energy, H2O, CO2, and CH4 fluxes was installed on May 17, 2012. Details on this pilot study are produced in a set of papers by Miller and colleagues [R. L. Miller and Fujii, 2010; R.L. Miller et al., 2000; R.L. Miller et al., 2008]. The fetch of this site extends 160 m in the predominant wind direction (252 degree counterclockwise from true North). We have to reject data when the wind direction lies outside of 240 to 290 degree counter clockwise from true North.

Ameriflux BADM Site Info

Last field site visit: more fieldnotes

2018-12-06 10:00:00 7700 not connected in software, reconnected.

Equipment installed at the site: more details
Campbell Sci. Interface A547
Campbell Sci. Multiplexer AM16/32B
Campbell Sci. Multiplexer AM25T
Campbell Sci. Data Logger CR1000
Campbell Sci. Water Level CS450
Campbell Sci. Conductivity Sensor CS547A
Decagon-METER Narrow Band SRS-Ni NDVI
Fabricated Battery Bank BB-Fab
Forerunner-Eosense CO2 probe GP-001
Gill Anemometer WM 1590
Hukseflux Net Radiometer NR01
Kipp & Zonen PAR Sensor PQS 1
Licor Gas Analyzer LI-7500A
Licor Interface LI-7550
Licor Gas Analyzer LI-7700
PME DO Sensor miniDOT-usb
Sensorex DO Sensor DO6400/T
Vaisala RH & Temp HMP60
Vaisala Barometer PTB110

Data Streams:

WP_flux 30 minute averages of the 10Hz flux data.
WP_met Met data from the West Pond collected with a CR1000 data logger.
WP_cam RGB digital number data extracted from autocam photos from four photos from 13:25 to 14:45
WP_minidot Dissolved oxygen from the minidot sensor at the tower

  This material is based upon work supported by the National Science Foundation and US Department of Energy. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the supporters.