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Bodega Head Intertidal Surf Zone Chlorophyll-a Raw Fluorescence

Metadata Updated: August 27, 2024

Chlorophyll-a fluorescence data were collected using a WET Labs ECO FL fluorometer (http://www.wetlabs.com/eco-fl) with the following manufacturer specifications: excitation/emission wavelengths: 470/695 nm; sensitivity: 0.02 ?g/l; and range: 0-125 ?g/I. Fluorometers were installed in the mid-intertidal zone (~ 0 0.3 m above MLLW) at Bodega Head (38.318739, -123.074186) in California, USA. The instrument is encased in a custom-made, secondary PVC case and then affixed to the rock using 3 stainless steel mesh straps and stainless steel lag screws screwed into high tension plastic anchors set into pre-drilled holes. The instrument face is oriented downslope and towards the water. Observations are logged every 15 minutes. The sensor face is cleaned every 2 weeks when possible but no less than every 4 weeks (depending on sea state). Instruments are typically deployed between January and March and then retrieved between September and November of each year. They are sent back to the manufacturer for servicing and re-characterization annually.

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License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date August 13, 2024
Metadata Created Date July 26, 2024
Metadata Updated Date August 27, 2024
Reference Date(s) 2016-07-27T22:54:54Z (creation), 2016-07-27T22:54:54Z (issued), 2016-07-27T22:54:54Z (revision)
Frequency Of Update

Metadata Source

Harvested from ioos

Additional Metadata

Resource Type Dataset
Metadata Date August 13, 2024
Metadata Created Date July 26, 2024
Metadata Updated Date August 27, 2024
Reference Date(s) 2016-07-27T22:54:54Z (creation), 2016-07-27T22:54:54Z (issued), 2016-07-27T22:54:54Z (revision)
Responsible Party Romberg Tiburon Center for Environmental Studies (Point of Contact)
Contact Email
Guid OceanSITES:OS_Bodega_Head_factory_20160727T155454.nc
Access Constraints
Bbox East Long -123.07419
Bbox North Lat 38.31874
Bbox South Lat 38.31874
Bbox West Long -123.07419
Coupled Resource
Frequency Of Update
Harvest Object Id 1bb87fc0-ec07-4cb2-93b7-844d842b1d72
Harvest Source Id 54e15a6e-6dde-4c9c-a8f0-345cc0dfccfb
Harvest Source Title ioos
Licence
Lineage All fluorometry data and tidal height predictions are collected and processed in Coordinated Universal Time (UTC). Out of water measurements are flagged in the dataset by interpolating between the raw fluorescence data points in order to align the fluorescence time series with tidal height predictions (downloaded from: http://tbone.biol.sc.edu/tide/) and identify observations when the tide is < 1 m above the apparent tidal height of the fluorometer. The apparent tidal height of the fluorometer is determined by visual inspection of the plotted fluorescence and tidal height data. The focal period is during extreme low tides when the fluorometer is clearly out of water, recorded measurement are close to the dark count offset value (see below) and do not change over the low tide interval. These data delineate an obvious, sharp transition as the instrument is uncovered or covered by the tide. Instrument fouling is also flagged in the dataset by visual inspection of the plotted fluorescence data. Fouling is defined as any period of randomly scattered data without an obvious trend in the fluorescence signal. To scale raw fluorescence observations to factory calibrated chlorophyll-a, WET Labs uses a chlorophyll-a equivalent concentration (CEC) scale factor. The CEC scale factor is calculated as the signal output using a fluorescent proxy approximately equal to 25 ?g/l of a Thalassiosira weissflogii phytoplankton culture (scale factor = 25 (?g/l)(Chl Equivalent Concentration dark count)-1). The dark count is the measured signal output of the fluorometer in clean water with black tape over the detector. Scaling is linear. These values are provided as part of the manufacturers annual characterization for each instrument (Table 1). CEC units are calculated from the raw data by subtracting the dark count and then multiplying by the scale factor. The data reported here are chlorophyll-a scaled to the factory CEC for the entire time series from 2010 2015. Out of water periods and fouled periods have not been removed but are flagged in the dataset. Only pre- and post-deployment data have been removed.
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Point", "coordinates": [-123.07419, 38.31874]}
Progress
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2010-04-16T02:15:00Z
Temporal Extent End 2015-11-22T00:00:00Z

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