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   set  data   graph     Hakai Bulk and Size-Fractionated Chlorophyll and Phaeopigment Concentrations Collected by
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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL cdm_data_type String TimeSeriesProfile
attribute NC_GLOBAL cdm_profile_variables String preciseLat, preciseLon, time
attribute NC_GLOBAL cdm_timeseries_variables String latitude, longitude, site_id, work_area
attribute NC_GLOBAL comment String ##Limitations:
The utilized acidification method is sensitive to interference by high concentrations of chlorophyll c and b. High chlorophyll c concentrations can cause a slight overestimation of chlorophyll a and an underestimation of phaeopigments, which can result in negative phaeopigment concentrations. High chlorophyll b concentrations can result in underestimations of chlorophyll a and overestimations of phaeopigments. When chlorophyll b is high relative to chlorophyll a, chlorophyll a can be underestimated by as much as 2.5 fold. For more details see Welschmeyer et al. (1994). These two types of interference likely had an influence on the published chlorophyll and phaeopigment dataset. Notably, comparison with HPLC has shown that stations in the Quadra Island region often experience conditions where chlorophyll b is present in high concentrations and is high relative to chlorophyll a.

The acidification method used to analyze the Hakai Institute dataset has been shown to highly overestimate phaeopigment concentrations based on comparison to concentrations determined by HPLC (Trees et al., 2003). Care should be used when interpreting the published phaeopigment concentrations.

Prior to 2021, samples that exceeded the manufacturer specified instrument sensitivity range were not diluted to bring their concentrations within the specified range. Samples run above the instrument sensitivity range may have underestimated chlorophyll concentrations due to the blockage of light passing through the sample and a corresponding reduction of fluorescence output (see Turner Trilogy user manual for complete description). As a result these samples were removed and the dataset lacks many concentrations from phytoplankton bloom events. Comparison with matching HPLC derived chlorophyll a suggests that the affected samples may be useable, but further analysis is required. These data can be shared upon request and are available in the provisional dataset.
attribute NC_GLOBAL comments String The utilized acidification method is sensitive to interference by high concentrations of chlorophyll c and b. High chlorophyll c concentrations can cause a slight overestimation of chlorophyll a and an underestimation of phaeopigments, which can result in negative phaeopigment concentrations. High chlorophyll b concentrations can result in underestimations of chlorophyll a and overestimations of phaeopigments. When chlorophyll b is high relative to chlorophyll a, chlorophyll a can be underestimated by as much as 2.5 fold. For more details see Welschmeyer et al. (1994). These two types of interference likely had an influence on the published chlorophyll and phaeopigment dataset. Notably, comparison with HPLC has shown that stations in the Quadra Island region often experience conditions where chlorophyll b is present in high concentrations and is high relative to chlorophyll a. The acidification method used to analyze the Hakai Institute dataset has been shown to highly overestimate phaeopigment concentrations based on comparison to concentrations determined by HPLC (Trees et al., 2003). Care should be used when interpreting the published phaeopigment concentrations. Prior to 2021, samples that exceeded the manufacturer specified instrument sensitivity range were not diluted to bring their concentrations within the specified range. Samples run above the instrument sensitivity range may have underestimated chlorophyll concentrations due to the blockage of light passing through the sample and a corresponding reduction of fluorescence output (see Turner Trilogy user manual for complete description). As a result these samples were removed and the dataset lacks many concentrations from phytoplankton bloom events. Comparison with matching HPLC derived chlorophyll a suggests that the affected samples may be useable, but further analysis is required. These data can be shared upon request.
attribute NC_GLOBAL contributor_name String Hakai Institute;Del Bel Belluz, Justin;Fedje, Bryn;Tula Foundation
attribute NC_GLOBAL contributor_role String owner,distributor;custodian,author,editor,pointOfContact,resourceProvider,principalInvestigator,originator,publisher;editor,processor,contributor;funder
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_city String Campbell River
attribute NC_GLOBAL creator_country String Canada
attribute NC_GLOBAL creator_email String justin.belluz at hakai.org
attribute NC_GLOBAL creator_institution String Hakai Institute
attribute NC_GLOBAL creator_name String Hakai Institute
attribute NC_GLOBAL creator_ror String https://ror.org/02pry0c91 (external link)
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://www.hakai.org/ (external link)
attribute NC_GLOBAL date_created String 2024-07-12
attribute NC_GLOBAL date_modified String 2024-07-12T19:36:06.603Z
attribute NC_GLOBAL doi String https://doi.org/10.21966/q5vm-8797 (external link)
attribute NC_GLOBAL featureType String TimeSeriesProfile
attribute NC_GLOBAL geospatial_bounds String -128.5,52.27 -127.4,52.21 -127.2,51.66 -125.6,51.13 -124.8,50.96 -124.1,50.43 -124.7,49.98 -124.9,49.80 -126.7,50.45 -128.1,51.37 -128.4,51.69 -128.5,52.27
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL geospatial_vertical_max String 650.0
attribute NC_GLOBAL geospatial_vertical_positive String down
attribute NC_GLOBAL geospatial_vertical_units String m
attribute NC_GLOBAL id String d55021c3-a142-4e14-8208-36c9826c1893
attribute NC_GLOBAL infoUrl String https://catalogue.hakai.org/dataset/ca-cioos_d55021c3-a142-4e14-8208-36c9826c1893
attribute NC_GLOBAL institution String Hakai Institute
attribute NC_GLOBAL keywords String abundance and biomass, Calvert Island, chlorophyll a, CIOOS:other, coastal characterization, Johnstone Strait, phytoplankton, Quadra Island, Salish Sea, Strait of Georgia, water quality
attribute NC_GLOBAL keywords_vocabulary String CIOOS: CIOOS Essential Ocean Variables Vocabulary
attribute NC_GLOBAL license String https://creativecommons.org/licenses/by/4.0 (external link)
attribute NC_GLOBAL metadata_form String https://hakaiinstitute.github.io/hakai-metadata-entry-form#/en/hakai/7U7b8oPpeTN6gjvXlUCTGJr5pga2/-MadZvZJ4ZeikpCgRcV8 (external link)
attribute NC_GLOBAL metadata_link String https://catalogue.hakai.org/dataset/ca-cioos_d55021c3-a142-4e14-8208-36c9826c1893
attribute NC_GLOBAL naming_authority String ca.cioos
attribute NC_GLOBAL platform String self-propelled small boat
attribute NC_GLOBAL platform_vocabulary String https://vocab.nerc.ac.uk/collection/L06/current/ (external link)
attribute NC_GLOBAL product_version String 1.0.0
attribute NC_GLOBAL progress String onGoing
attribute NC_GLOBAL project String Oceanography
attribute NC_GLOBAL publisher_address String 1713 Hyacinthe Bay Road
attribute NC_GLOBAL publisher_city String Campbell River
attribute NC_GLOBAL publisher_country String Canada
attribute NC_GLOBAL publisher_email String justin.belluz at hakai.org
attribute NC_GLOBAL publisher_institution String Hakai Institute
attribute NC_GLOBAL publisher_name String Del Bel Belluz, Justin
attribute NC_GLOBAL publisher_orcid String https://orcid.org/0000-0002-3536-9508 (external link)
attribute NC_GLOBAL publisher_ror String https://ror.org/02pry0c91 (external link)
attribute NC_GLOBAL publisher_type String person
attribute NC_GLOBAL publisher_url String https://www.hakai.org/ (external link)
attribute NC_GLOBAL sourceUrl String (source database)
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v79
attribute NC_GLOBAL subsetVariables String work_area, survey, site_id, line_out_depth
attribute NC_GLOBAL summary String This dataset is comprised of Hakai Institute chlorophyll and phaeopigment concentrations collected from 2017 to present at stations within the Calvert Island, Johnstone Strait, and the Quadra Island study regions. Samples for these data were collected in the field using Niskin bottles. Sample water (250 ml) was filtered through: 1) a single glass fiber filter (GF/F, nominal pore size 0.7 um) to comprise a bulk measure of phytoplankton chlorophyll and phaeopigment concentrations and 2) a stack of filters (GF/F, 3 um, and 20 um polycarbonate filters) to estimate chlorophyll and phaeopigment concentrations from pico, nano, and micro-phytoplankton, respectively. Filters were extracted for 24 hours in 10 ml of 90% acetone and analyzed on Turner Designs Trilogy laboratory fluorometers using the acidification module and following the method of Holm Hansen et al. (1965).

Data have been quality controlled by manual inspection which included a comparison of bulk concentrations against the sum of the size-fractionated filter concentrations. Where available, further comparisons were done with other measures of chlorophyll concentrations including in situ CTD chlorophyll fluorescence and high-performance liquid chromatography (HPLC) data.

Data were collected by the Hakai Institute Oceanography and Nearshore programs.
attribute NC_GLOBAL title String Hakai Bulk and Size-Fractionated Chlorophyll and Phaeopigment Concentrations Collected by Niskin Bottle, Research
variable work_area   String  
attribute work_area long_name String Work Area
variable survey   String  
attribute survey long_name String Survey
variable site_id   String  
attribute site_id cf_role String timeseries_id
attribute site_id long_name String Site Id
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude axis String Y
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
variable longitude   double  
attribute longitude _CoordinateAxisType String Lon
attribute longitude axis String X
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude source_name String long
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable preciseLat   double  
attribute preciseLat long_name String Precise Latitude
attribute preciseLat units String degrees_north
variable preciseLon   double  
attribute preciseLon long_name String Precise Longitude
attribute preciseLon units String degrees_east
variable depth   double  
attribute depth _CoordinateAxisType String Height
attribute depth _CoordinateZisPositive String down
attribute depth axis String Z
attribute depth ioos_category String Location
attribute depth long_name String Depth
attribute depth positive String down
attribute depth standard_name String depth
attribute depth units String m
variable line_out_depth   double  
attribute line_out_depth actual_range double 0.0, 260.0
attribute line_out_depth long_name String Line Out Depth
attribute line_out_depth units String m
variable pressure_transducer_depth   double  
attribute pressure_transducer_depth long_name String Pressure Transducer Depth
attribute pressure_transducer_depth units String m
variable time   double  
attribute time _CoordinateAxisType String Time
attribute time axis String T
attribute time cf_role String profile_id
attribute time ioos_category String Time
attribute time long_name String Collected
attribute time source_name String collected
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
variable phaeo_20um   double  
attribute phaeo_20um long_name String Bigger than 20um Concentration Of Phaeopigments In Sea Water
attribute phaeo_20um sdn_parameter_name String Concentration of phaeopigments {pheopigments} per unit volume of the water body [particulate >20um phase] by filtration, acetone extraction and fluorometry
attribute phaeo_20um sdn_parameter_urn String SDN:P01::
attribute phaeo_20um sdn_uom_name String Micrograms per litre
attribute phaeo_20um sdn_uom_urn String SDN:P06::UGPL
attribute phaeo_20um units String ug/L
variable phaeo_3_20um   double  
attribute phaeo_3_20um long_name String 3um to 20um Concentration Of Phaeopigments In Sea Water
attribute phaeo_3_20um sdn_parameter_name String Concentration of phaeopigments {pheopigments} per unit volume of the water body [particulate 3-20um phase] by filtration, acetone extraction and fluorometry
attribute phaeo_3_20um sdn_parameter_urn String SDN:P01::
attribute phaeo_3_20um sdn_uom_name String Micrograms per litre
attribute phaeo_3_20um sdn_uom_urn String SDN:P06::UGPL
attribute phaeo_3_20um units String ug/L
variable phaeo_2_20um   double  
attribute phaeo_2_20um long_name String 2um to 20um Concentration Of Phaeopigments In Sea Water
attribute phaeo_2_20um sdn_parameter_name String Concentration of phaeopigments {pheopigments} per unit volume of the water body [particulate 2-20um phase] by filtration, acetone extraction and fluorometry
attribute phaeo_2_20um sdn_parameter_urn String SDN:P01::SPHAFLPG
attribute phaeo_2_20um sdn_uom_name String Micrograms per litre
attribute phaeo_2_20um sdn_uom_urn String SDN:P06::UGPL
attribute phaeo_2_20um units String ug/L
variable phaeo_gff_2um   double  
attribute phaeo_gff_2um long_name String GF/F size to 2um size Concentration Of Phaeopigments In Sea Water
attribute phaeo_gff_2um sdn_parameter_name String Concentration of phaeopigments {pheopigments} per unit volume of the water body [particulate GF/F-2um phase] by filtration, acetone extraction and fluorometry
attribute phaeo_gff_2um sdn_parameter_urn String SDN:P01::
attribute phaeo_gff_2um sdn_uom_name String Micrograms per litre
attribute phaeo_gff_2um sdn_uom_urn String SDN:P06::UGPL
attribute phaeo_gff_2um units String ug/L
variable phaeo_gff_3um   double  
attribute phaeo_gff_3um long_name String GF/F size to 3um size Concentration Of Phaeopigments In Sea Water
attribute phaeo_gff_3um sdn_parameter_name String Concentration of phaeopigments {pheopigments} per unit volume of the water body [particulate GF/F-3um phase] by filtration, acetone extraction and fluorometry
attribute phaeo_gff_3um sdn_parameter_urn String SDN:P01::
attribute phaeo_gff_3um sdn_uom_name String Micrograms per litre
attribute phaeo_gff_3um sdn_uom_urn String SDN:P06::UGPL
attribute phaeo_gff_3um units String ug/L
variable phaeo_bulk_gff   double  
attribute phaeo_bulk_gff long_name String Bulk Concentration Of Phaeopigments In Sea Water
attribute phaeo_bulk_gff sdn_parameter_name String Concentration standard deviation of phaeopigments {pheopigments} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and fluorometry
attribute phaeo_bulk_gff sdn_parameter_urn String SDN:P01::PHSDFLP1
attribute phaeo_bulk_gff sdn_uom_name String Micrograms per litre
attribute phaeo_bulk_gff sdn_uom_urn String SDN:P06::UGPL
attribute phaeo_bulk_gff units String ug/L
variable chla_20um   double  
attribute chla_20um colorBarMaximum double 30.0
attribute chla_20um colorBarMinimum double 0.0
attribute chla_20um long_name String >20um Concentration Of Chlorophyll In Sea Water
attribute chla_20um sdn_parameter_name String Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >20um phase] by filtration, acetone extraction and fluorometry
attribute chla_20um sdn_parameter_urn String SDN:P01::SCHLFLPQ
attribute chla_20um sdn_uom_name String Micrograms per litre
attribute chla_20um sdn_uom_urn String SDN:P06::UGPL
attribute chla_20um standard_name String mass_concentration_of_microphytoplankton_expressed_as_chlorophyll_in_sea_water
attribute chla_20um units String ug/L
variable chla_2_20um   double  
attribute chla_2_20um colorBarMaximum double 30.0
attribute chla_2_20um colorBarMinimum double 0.0
attribute chla_2_20um long_name String "2um to 20um Concentration Of Chlorophyll In Sea Water"
attribute chla_2_20um sdn_parameter_name String Concentration standard deviation of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate 2-20um phase] by filtration, acetone extraction and fluorometry
attribute chla_2_20um sdn_parameter_urn String SDN:P01::SCHDSDPG
attribute chla_2_20um sdn_uom_name String Micrograms per litre
attribute chla_2_20um sdn_uom_urn String SDN:P06::UGPL
attribute chla_2_20um standard_name String mass_concentration_of_nanophytoplankton_expressed_as_chlorophyll_in_sea_water
attribute chla_2_20um units String ug/L
variable chla_3_20um   double  
attribute chla_3_20um colorBarMaximum double 30.0
attribute chla_3_20um colorBarMinimum double 0.0
attribute chla_3_20um long_name String 3um to 20um Concentration Of Chlorophyll In Sea Water
attribute chla_3_20um sdn_parameter_name String Concentration standard deviation of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate GF/F-3um phase] by filtration, acetone extraction and fluorometry
attribute chla_3_20um sdn_parameter_urn String SDN:P01::
attribute chla_3_20um sdn_uom_name String Micrograms per litre
attribute chla_3_20um sdn_uom_urn String SDN:P06::UGPL
attribute chla_3_20um standard_name String mass_concentration_of_nanophytoplankton_expressed_as_chlorophyll_in_sea_water
attribute chla_3_20um units String ug/L
variable chla_gff_2um   double  
attribute chla_gff_2um colorBarMaximum double 30.0
attribute chla_gff_2um colorBarMinimum double 0.0
attribute chla_gff_2um long_name String GF/F to 2um Concentration Of Chlorophyll In Sea Water
attribute chla_gff_2um sdn_parameter_name String Concentration standard deviation of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate GF/F-2um phase] by filtration, acetone extraction and fluorometry
attribute chla_gff_2um sdn_parameter_urn String SDN:P01::
attribute chla_gff_2um sdn_uom_name String Micrograms per litre
attribute chla_gff_2um sdn_uom_urn String SDN:P06::UGPL
attribute chla_gff_2um standard_name String mass_concentration_of_picophytoplankton_expressed_as_chlorophyll_in_sea_water
attribute chla_gff_2um units String ug/L
variable chla_gff_3um   double  
attribute chla_gff_3um colorBarMaximum double 30.0
attribute chla_gff_3um colorBarMinimum double 0.0
attribute chla_gff_3um long_name String GF/F to 3um Concentration Of Chlorophyll In Sea Water
attribute chla_gff_3um sdn_parameter_urn String SDN:P01::
attribute chla_gff_3um sdn_uom_name String Micrograms per litre
attribute chla_gff_3um sdn_uom_urn String SDN:P06::UGPL
attribute chla_gff_3um standard_name String mass_concentration_of_picophytoplankton_expressed_as_chlorophyll_in_sea_water
attribute chla_gff_3um units String ug/L
variable chla_bulk_gff   double  
attribute chla_bulk_gff colorBarMaximum double 30.0
attribute chla_bulk_gff colorBarMinimum double 0.0
attribute chla_bulk_gff long_name String Bulk Concentration Of Chlorophyll In Sea Water
attribute chla_bulk_gff sdn_parameter_name String Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and fluorometry
attribute chla_bulk_gff sdn_parameter_urn String SDN:P01::CPHLFLP1
attribute chla_bulk_gff sdn_uom_name String Micrograms per litre
attribute chla_bulk_gff sdn_uom_urn String SDN:P06::UGPL
attribute chla_bulk_gff standard_name String mass_concentration_of_chlorophyll_in_sea_water
attribute chla_bulk_gff units String ug/L

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.


 
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