Optical, chemical, and biological oceanographic conditions on the Scotian Shelf and in the eastern Gulf of Maine in 2019

Ocean physical conditions in the Maritimes Region in 2019 were characterized by cooler surface temperatures, continued warmer bottom temperatures and weaker stratification compared to recent years. Deep nutrient inventories were lower than normal over most of the region, with the exception of the Cabot Strait section where deep nutrients were near or higher than normal during the spring sampling and associated with record-warm water. Anomalies of surface nutrients were negative across the region, with the exception of positive anomalies observed at the deep shelf and offshore stations of the Louisbourg section. The spring phytoplankton bloom was near or slightly earlier than normal across the Scotian Shelf (SS) with near-normal duration. Peak chlorophyll a concentrations during the spring bloom occurred within a narrow time window across the SS. At Halifax-2 (HL2), the spring bloom was characterized by a high amplitude, and a rapid progression and decline. Plankton community changes persisted in 2019 with lower abundance of large phytoplankton (diatoms), mainly lower-than-normal biomass of zooplankton and abundance of Calanus finmarchicus, and higher-than-normal abundance of non-copepods. Arctic Calanus and warm-shelf copepods showed mixed abundance anomalies in 2019, reversing the pattern of 2018. Above-normal abundances of Oithona atlantica, especially at HL2, suggest a greater influence of offshore waters in recent years. Surface temperature in the Bedford Basin was near normal in 2019 with mainly cooler-than-normal temperatures from January to June and near- or slightly-above-normal temperatures from July to December. Bottom temperature and salinity were below normal in 2019 with near- or slightly-above-normal conditions at the start of the year and progressing toward cooler and fresher water from February to December. Surface and deep nitrate, phosphate and silicate were near or below normal, with surface phosphate reaching a record low in 2019. The 2018 Continuous Plankton Recorder data indicated an annual abundance of diatoms close to normal for the Eastern (ESS) and Western Scotian Shelf (WSS), while the abundance of dinoflagellates and the Phytoplankton Colour Index values were near (WSS) or above (ESS) normal. The annual abundance of Calanus CI-IV was near normal (ESS) or slightly below normal (WSS), while C. finmarchicus CV-VI levels were slightly below (ESS) or below (WSS) normal. The abundance of Calanus glacialis (ESS, WSS) and Para/Pseudocalanus and Limacina spp. (WSS) were lower than normal, while that of coccolithphore (ESS, WSS), and copepod nauplii and foraminifera (ESS) was higher than normal. "

Date ( RI_366 ): 2019-01-01

Date ( RI_367 ): 2020-12-04

RI_415

Government of Canada; Fisheries and Oceans Canada - Catherine Johnson ( )

Bedford Institute of Oceanography, 1 Challenger Drive, PO Box 1006 , Dartmouth , Nova Scotia , B2Y 4A2 , Canada

Purpose: "This entry provides access to the figures and data tables that feature in the CSAS Research Document titled 'Optical, chemical, and biological oceanographic conditions on the Scotian Shelf and in the eastern Gulf of Maine in 2019'.

Please consult the meta-data text file that accompanies the zip file download for the figure on the data usage policy and appropriate citation. The meta-data file also provides field descriptors and any other information that may be useful in interpreting the data provided in relation to the accompanying imagery.

Status: onGoing; enContinue RI_596

Maintenance and update frequency: asNeeded; auBesoin RI_540

Keywords ( RI_528 )

Chlorophyll
Nutrients
Plankton

Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( RI_528 )

Marine biology
Coastal waters
Earth sciences
Salt water
Oceans
Water
Oceanography

Use limitation: Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada)

Access constraints: license; licence RI_606

Use constraints: license; licence RI_606

Use limitation: Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada)

Classification: unclassified; nonClassifié RI_484

Spatial representation type: textTable; texteTable RI_637

Metadata language: eng; CAN

Character set: utf8; utf8 RI_458

Topic category

Oceans

Begin date: 2019-01-01

End date: 2019-12-31

Reference system identifier: http://www.epsg-registry.org / EPSG:4326 / 8.2.6

Distribution format

CSV ( n/a )

RI_414

Government of Canada; Fisheries and Oceans Canada - OESD Data Request / DSEM Demande de donnés (DFO/MPO) ( )

Bedford Institute of Oceanography, 1 Challenger Drive, PO Box 1006 , Dartmouth , Nova Scotia , B2Y 4A2 , Canada

RI_412

Government of Canada; Fisheries and Oceans Canada - Data Acquisition Assembly and Distribution / Acquisition, assemblage et distribution de données ( )

Bedford Institute of Oceanography, 1 Challenger Drive, P.O. Box 1006 , Dartmouth , Nova Scotia , B2Y 4A2 , Canada

OnLine resource: Figure 06 : Mixing properties at the fixed stations (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 06 : Mixing properties at the fixed stations (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 08 : Optical properties at the fixed stations (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 08 : Optical properties at the fixed stations (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 10 : Nitrate inventories at the fixed stations (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 10 : Nitrate inventories at the fixed stations (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 11 : Maritimes region nutrients anomaly scorecard (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 11 : Maritimes region nutrients anomaly scorecard (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 15 : Chlorophyll inventories at the fixed stations (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 15 : Chlorophyll inventories at the fixed stations (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 16 : Microplankton abundance and community composition at the fixed stations (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 16 : Microplankton abundance and community composition at the fixed stations (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 17 : Maritimes region plankton anomaly scorecard (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 17 : Maritimes region plankton anomaly scorecard (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 18 : Microplankton abundance anomaly scorecard at the fixed stations (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 18 : Microplankton abundance anomaly scorecard at the fixed stations (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 21: Maritimes region microplankton pigments anomaly scorecard (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 21: Maritimes region microplankton pigments anomaly scorecard (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 22 : Zooplankton biomass at the fixed stations (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 22 : Zooplankton biomass at the fixed stations (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 23 : Zooplankton abundance and community composition at the fixed stations (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 23 : Zooplankton abundance and community composition at the fixed stations (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 24 : Calanus finmarchicus abundance and stage distribution at the fixed stations (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 24 : Calanus finmarchicus abundance and stage distribution at the fixed stations (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 25: Dominant copepods abundance at Prince-5 and Halifax 2 stations (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 25: Dominant copepods abundance at Prince-5 and Halifax 2 stations (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 26 : Zooplankton biomass - AZMP sections (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 26 : Zooplankton biomass - AZMP sections (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 27 : Zooplankton biomass - Ecosystem trawl surveys (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 27 : Zooplankton biomass - Ecosystem trawl surveys (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 28 : Calanus finmarchicus abundance - AZMP sections (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 28 : Calanus finmarchicus abundance - AZMP sections (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 29 : Calanus finmarchicus abundance - Ecosystem trawl surveys (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 29 : Calanus finmarchicus abundance - Ecosystem trawl surveys (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 30 : Non-copepods abundance anomaly scorecard - Scotian Shelf (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 30 : Non-copepods abundance anomaly scorecard - Scotian Shelf (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Figure 31 : Maritimes region indicator copepods groups abundance anomaly scorecard (English) ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Figure 31 : Maritimes region indicator copepods groups abundance anomaly scorecard (French) ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Research Document ( HTTPS )
Supporting Document;HTML;eng

OnLine resource: Research Document ( HTTPS )
Supporting Document;HTML;fra

File identifier: 498ad021-92af-431c-80c6-bc2781c320f3 XML

Metadata language: eng; CAN

Character set: utf8; utf8 RI_458

Parent identifier: b81c8d9c-690f-4c2a-aadc-7935c0923cc0 b81c8d9c-690f-4c2a-aadc-7935c0923cc0

Hierarchy level: dataset; jeuDonnées RI_622

Date stamp: 2025-02-07T15:43:17.556Z

Metadata standard name: North American Profile of ISO 19115:2003 - Geographic information - Metadata

Metadata standard version: CAN/CGSB-171.100-2009

Metadata author

No information provided.

RI_408

Government of Canada; Fisheries and Oceans Canada - OESD Data Request / DSEM Demande de donnés (DFO/MPO) ( )

Bedford Institute of Oceanography, 1 Challenger Drive, PO Box 1006 , Dartmouth , Nova Scotia , B2Y 4A2 , Canada

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