Kibesillah Hill Intertidal Surf Zone Chlorophyll-a Raw Fluorescence


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 Kibesillah Hill (39.600363, -123.789155) 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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Distribution Formats
  • OPeNDAP
Point of Contact Dr. Karina J. Nielsen
Romberg Tiburon Center for Environmental Studies
Online Resource
Originator Dr. Karina J. Nielsen
Romberg Tiburon Center for Environmental Studies
Online Resource
field maintenance, data collection, and data processing Megan Wood
Dataset Point of Contact CeNCOOS
cencoos_communications@mbari.org
General Documentation
Associated Documentation CeNCOOS: Long-term monitoring of environmental conditions in support of protected marine area management in central and northern California; CeNCOOS: Integrating marine observations to inform decision makers and the general public; Collaborative Research: Scaling up from community to meta-ecosystem dynamics in the rocky intertidal - a comparative-experimental approach; Collaborative Research: The role of calcifying algae as a determinant of rocky intertidal macrophyte community structure at a meta-ecosystem scale
Date(s) creation: 2015-11-03T17:56:11Z
issued: 2015-11-03T17:56:11Z
revision: 2015-11-03T17:56:11Z
creation: 2015-11-03T17:56:11Z
issued: 2015-11-03T17:56:11Z
revision: 2015-11-03T17:56:11Z
creation: 2015-11-03T17:56:11Z
issued: 2015-11-03T17:56:11Z
revision: 2015-11-03T17:56:11Z
creation: 2015-11-03T17:56:11Z
issued: 2015-11-03T17:56:11Z
revision: 2015-11-03T17:56:11Z
creation: 2015-11-03T17:56:11Z
issued: 2015-11-03T17:56:11Z
revision: 2015-11-03T17:56:11Z
Use Limitations
Time Period 2009-03-07T20:15:00Z to 2014-11-05T00:00:00Z
Spatial Bounding Box Coordinates N: 39.60037° S: 39.60035° E: -123.78914° W: -123.78916°
Theme keywords GCMD Science Keywords
  • intertidal
  • surf zone
  • chlorophyll-a
  • fluorescence
  • Kibesillah Hill
  • northern California

CF-1.6
  • chlorophyll sensor out of water flag
  • Fouled sensor flag
  • time
  • latitude
  • longitude
  • depth

Data Center keywords Uncategorized
  • CeNCOOS

Project keywords Uncategorized
  • CeNCOOS: Long-term monitoring of environmental conditions in support of protected marine area management in central and northern California; CeNCOOS: Integrating marine observations to inform decision makers and the general public; Collaborative Research: Scaling up from community to meta-ecosystem dynamics in the rocky intertidal - a comparative-experimental approach; Collaborative Research: The role of calcifying algae as a determinant of rocky intertidal macrophyte community structure at a meta-ecosystem scale

Lineage Statement 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 2009 2014. 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.