Lehmann, Nadine; Reed, Daniel C; Buchwald, Carolyn; Lavoie, Diane; Yeats, Philip A; Mei, Zhi-Ping; Wang, Zeliang; Johnson, Catherine (2024): Hydrographic CTD data from 1975-2020 on the Scotian Shelf, Northwest Atlantic [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.963967
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Subsurface nutrients on the Scotian Shelf, an ocean region at the convergence of the subpolar and subtropical western boundary currents (i.e., Labrador Current and Gulf Stream), are chiefly modulated by upstream shelf and slope waters. Yet little is known about long-term fluctuations in the advective transport of nutrients to the shelf. To examine the relationships between subsurface nutrient concentrations and dominant slope water masses at the Scotian Shelf break, we assembled all available hydrographic data (temperature, salinity) and dissolved nutrient data (nitrate, phosphate, silicate) for the period 1975-2020. Hydrographic and nutrient data were extracted from the Fisheries and Oceans Canada (DFO) data archives MEDS (Marine Environmental Data Section Archive; DFO, 2023a) and BioChem (DFO, 2023b; Devine et al., 2014), respectively, and predominantly include data from current DFO programs (e.g., Atlantic Zone Monitoring Program (AZMP)) and legacy datasets. Hydrographic data consist of vertical water column profiles collected using a conductivity-temperature-depth (CTD) profiler, generally mounted to a rosette sampler equipped with Niskin bottles for discrete water and nutrient sampling (Mitchel et al., 2002). Nutrient (nitrate, phosphate, silicate) measurements generally followed well established colorimetric techniques outlined in detail in the AZMP sampling protocol (Mitchell et al., 2002). Only nutrient data that passed initial quality control (i.e., BioChem quality flags of 1 and 0) are included in the datasets provided here (see Devine et al., 2014 for details on quality control (QC) procedures). In addition to hydrographic and nutrient parameters, datasets further include information on designated regions (e.g., WSS: Western Scotian Shelf, CSS: Central Scotian Shelf, ESS: Eastern Scotian Shelf) as defined in Lehmann et al (2023).
Related to:
Lehmann, Nadine; Reed, Daniel C; Buchwald, Carolyn; Lavoie, Diane; Yeats, Philip A; Mei, Zhi-Ping; Wang, Zeliang; Johnson, Catherine (2024): Hydrographic and nutrient data from 1975-2020 on the Scotian Shelf, Northwest Atlantic. PANGAEA, https://doi.org/10.1594/PANGAEA.963728
Source:
Department of Fisheries and Oceans (DFO) Canada (2022): BioChem: database of biological and chemical oceanographic data. Department of Fisheries and Oceans, Canada. http://www.dfo-mpo.gc.ca/science/data-donnees/biochem/index-eng.html. Database accessed on 2022-02-23. http://www.dfo-mpo.gc.ca/science/data-donnees/biochem/index-eng.html
Department of Fisheries and Oceans (DFO) Canada (2022): Marine Environmental Data Section Archive, https://meds-sdmm.dfo-mpo.gc.ca, Ecosystem and Oceans Science, Department of Fisheries and Oceans Canada. Data obtained on 2022-02-23. https://meds-sdmm.dfo-mpo.gc.ca
Documentation:
Devine, L; Kennedy, M K; St-Pierre, I; Lafleur, C; Ouellet, M; Bond, S (2014): BioChem: The Fisheries and Oceans Canada Database for Biological and Chemical Data. Canadian technical report of fisheries and aquatic sciences1488-5379No. 3073, iv + 40 pp, https://cat.fsl-bsf.scitech.gc.ca/record=b4008162~S1
Lehmann, Nadine; Reed, Daniel C; Buchwald, Carolyn; Lavoie, Diane; Yeats, Philip A; Mei, Zhi-Ping; Wang, Zeliang; Johnson, Catherine (2023): Decadal Variability in Subsurface Nutrient Availability on the Scotian Shelf Reflects Changes in the Northwest Atlantic Ocean. Journal of Geophysical Research: Oceans, 128(11), e2023JC019928, https://doi.org/10.1029/2023JC019928
Mitchell, Michel R; Harrison, Glen; Pauley, Kevin; Gagné, Alain; Maillet, Gary; Strain, Peter (2002): Atlantic Zonal Monitoring Program Sampling Protocol. Canadian Technical Report of
Hydrography and Ocean Sciences 223, iv + 23 pp, https://publications.gc.ca/collections/collection_2007/dfo-mpo/Fs97-18-223-2002E.pdf
Funding:
Coverage:
Median Latitude: 43.934394 * Median Longitude: -62.430495 * South-bound Latitude: 40.401420 * West-bound Longitude: -70.276920 * North-bound Latitude: 47.591440 * East-bound Longitude: -55.840020
Date/Time Start: 1970-02-01T11:00:00 * Date/Time End: 2020-10-14T00:00:00
Minimum DEPTH, water: 0.00 m * Maximum DEPTH, water: 1249.66 m
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Cruise/expedition | Expedition | Johnson, Catherine | Compilation | Cruise ID | |
2 | Name | Name | Johnson, Catherine | Compilation | of CTD database | |
3 | Data ID | Data ID | Johnson, Catherine | Compilation | CTD-ID | |
4 | DATE/TIME | Date/Time | Johnson, Catherine | Compilation | Geocode | |
5 | LATITUDE | Latitude | Johnson, Catherine | Compilation | Geocode | |
6 | LONGITUDE | Longitude | Johnson, Catherine | Compilation | Geocode | |
7 | DEPTH, water | Depth water | m | Johnson, Catherine | Compilation | Geocode |
8 | Location | Location | Johnson, Catherine | Compilation | Location corresponds to subregions defined in Lehmann et al. (2023) | |
9 | Salinity | Sal | Johnson, Catherine | Compilation | ||
10 | Temperature, water | Temp | °C | Johnson, Catherine | Compilation | |
11 | Data source | Data source | Johnson, Catherine | Compilation | of CTD database | |
12 | Uniform resource locator/link to source data file | URL source | Johnson, Catherine | Compilation | of CTD database |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
17375611 data points
Download Data
View dataset as HTML (shows only first 2000 rows)