http://lod.bco-dmo.org/id/dataset/999115
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2026-05-21
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Large phytoplankton chain lengths from BIOSWOT-Med Zooglider deployment in the Northwest Mediterranean Sea during March to May 2023
2026-05-22
publication
2026-05-22
revision
Woods Hole Oceanographic Institution (WHOI BCO-DMO)
2026-05-22
publication
https://doi.org/10.26008/1912/bco-dmo.999115.1
Mark D. Ohman
University of California-San Diego Scripps
principalInvestigator
Jeffrey S. Ellen
Naval Information Warfare Center Pacific
principalInvestigator
Sven Gastauer
Thünen Institute of Sea Fisheries
principalInvestigator
Karine Leblanc
Aix-Marseille University
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Ohman, M. D., Leblanc, K., Ellen, J. S., Gastauer, S. (2026) Large phytoplankton chain lengths from BIOSWOT-Med Zooglider deployment in the Northwest Mediterranean Sea during March to May 2023. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-05-22 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.999115.1 [access date]
Long Phytoplankton Chain lengths, Zooglider BioSWOT-Med Dataset Description: Methods and Sampling: <p><em>Zooglider</em> was deployed in the western Mediterranean Sea between 20 March and 8 May 2023 as a part of the BioSWOT-Med program (Doglioli et al. 2024). It was initially released off the coast of Majorca, navigated to south of Menorca, then recovered at sea and redeployed in the center of an anticyclonic eddy north of Menorca. The shadowgraph imaging Zoocam on <em>Zooglider</em> was activated for dives 1-8 (Majorca, 30 March), dives 245-314 (south of Menorca, 24 April–3 May), and dives 353-389 (eddy, 4-8 May). <em>Zooglider</em> ascended at ~10 centimeters per second (cm/s) and the Zoocam sampled at 1 Hz throughout ascent, providing an image approximately every 10 cm of vertical travel. The 15 cm light path of the Zoocam is illuminated with a red LED (620-630 nm), imaging 250 milliliters (mL) per frame. Further details are in Ohman et al. (2018).</p>
<p>After flatfielding, Regions of Interest (ROIs) were segmented using a two step Canny edge detector (Ellen 2018, Ohman et al. 2018). ROIs were pre-classified using a Convolutional Neural Network (Ellen and Ohman 2024), then the classification of ROIs manually verified. In this verification process we observed numerous phytoplankton chains whose morphology was familiar, but whose dimensions were much greater than expected. We retrieved a subset of phytoplankton chains whose feret diameter was <u>&gt;</u> 2 millimeters (mm) for closer manual inspection. These ROIs were measured manually with an on-screen digital tool.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2243190 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2243190
completed
Mark D. Ohman
University of California-San Diego Scripps
619-534-2754
Scripps Institution of Oceanography 0218 University of California, San Diego 9500 Gilman Drive
La Jolla
CA
92093-0218
USA
mohman@ucsd.edu
pointOfContact
Jeffrey S. Ellen
Naval Information Warfare Center Pacific
jeff@ulysses.eco
pointOfContact
Sven Gastauer
Thünen Institute of Sea Fisheries
Herwigstraße 31
Bremerhaven
27572
Germany
sven.gastauer@gmail.com
pointOfContact
Karine Leblanc
Aix-Marseille University
karine.leblanc@mio.osupytheas.fr
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Taxon
Dive
latitude_mid_ascent_75
longitude_mid_ascent_75
ISO_DateTime_CET
ISO_DateTime_UTC
Pressure_db
Total_length_mm
Comments
Zooglider SN51
theme
None, User defined
taxon
dive_id
latitude
longitude
ISO_DateTime_Local
ISO_DateTime_UTC
water pressure
length
comments
featureType
BCO-DMO Standard Parameters
Zooglider
instrument
BCO-DMO Standard Instruments
BioSWOT-Med
service
Deployment Activity
Northwestern Mediterranean Sea
place
Locations
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Zooglider assessment of zooplankton frontal gradients across the BIOSWOT-Med region
https://osprey.bco-dmo.org/project/920991
Zooglider assessment of zooplankton frontal gradients across the BIOSWOT-Med region
<p><em><strong>NSF Award Abstract:</strong></em><br />
Ocean fronts are regions of sharp horizontal discontinuities that can alter phytoplankton growth rates and community composition, zooplankton distributions and grazing activity, and predator foraging success. This study is using Zooglider, an autonomous ocean sampler equipped with a range of sensors and capitalizing on a unique opportunity to investigate frontal gradients and plankton communities in the western Mediterranean Sea. It is timed to coincide with a rapid crossover phase of a new NASA satellite mission. The combination of satellite and field-collected data will provide high resolution of the bio-physical consequences of oceanic frontal processes. The project incorporates training for graduate and undergraduate students as well as public outreach. Results are broadly communicated by partnering with a major public aquarium that serves 450,000 visitors per year, including by exhibiting novel porcelain ‘Zooware’ meant to convey the sensory experience of exploring the ocean’s planktonic fauna.</p>
<p>This project focuses on advancing understanding of frontal processes in the western Mediterranean Sea, at a ‘crossover’ site where NASA’s new Surface Water Ocean Topography (SWOT) satellite is making high-frequency sea surface height measurements using a high-resolution sensor. Measurements from the SWOT satellite are resolving small changes in sea-surface height, making it possible to follow the development and temporal progression of ocean frontal systems. The investigator is assessing the consequences of these frontal systems by testing the hypotheses that 1) zooplankton, marine snow particles, and predators are altered in these ocean frontal regions with a size-dependent or trait-dependent response; 2) particle-grazing zooplankton are more closely associated with layers of marine snow than with layers of living phytoplankton; 3) vertical thin layers of zooplankton are more likely to form in frontal than non-frontal regions; and 4) higher predators such as zooplanktivorous fish and marine mammals are more detectable in frontal regions The project makes use of an autonomous ocean instrument, the Zooglider. It includes a shadowgraph imaging Zoocam for resolving zooplankton and marine snow; a dual frequency Zonar to resolve mesozooplankton and larger sources of acoustic backscatter; and a sensitive hydrophone for recording ambient sounds, especially from marine mammals and fishes. These autonomous measurements are coordinated with complementary measurements from a ship-based sampling program, other autonomous vehicles, and satellite remote sensing.</p>
BIOSWOT-Med
largerWorkCitation
project
eng; USA
oceans
Northwestern Mediterranean Sea
2.53681
5.4071
39.32251
40.9832
2023-03-30
2023-05-08
NW Mediterranean Sea
0
BCO-DMO catalogue of parameters from Large phytoplankton chain lengths from BIOSWOT-Med Zooglider deployment in the Northwest Mediterranean Sea during March to May 2023
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/999193.rdf
Name: Taxon
Units: unitless
Description: <p>One of 5 categories of elongate phytoplankton chains whose total length was measured</p>
http://lod.bco-dmo.org/id/dataset-parameter/999194.rdf
Name: Dive
Units: unitless
Description: <p>Zooglider dive number</p>
http://lod.bco-dmo.org/id/dataset-parameter/999195.rdf
Name: latitude_mid_ascent_75
Units: decimal degrees
Description: <p>Latitude of mid-point of dive during ascent in decimal degrees; positive values indicate northern coordinates</p>
http://lod.bco-dmo.org/id/dataset-parameter/999197.rdf
Name: longitude_mid_ascent_75
Units: decimal degrees
Description: <p>Longitude of mid-point of dive during ascent in decimal degrees; positive values indicate eastern coordinates</p>
http://lod.bco-dmo.org/id/dataset-parameter/999199.rdf
Name: ISO_DateTime_CET
Units: unitless
Description: <p>Date and time of Zooglider dive (Central European Time) in ISO 8601 format</p>
http://lod.bco-dmo.org/id/dataset-parameter/999200.rdf
Name: ISO_DateTime_UTC
Units: unitless
Description: <p>Date and time of Zooglider dive (UTC) in ISO 8601 format</p>
http://lod.bco-dmo.org/id/dataset-parameter/999202.rdf
Name: Pressure_db
Units: decibars
Description: <p>Pressure at which phytoplankton chain was imaged</p>
http://lod.bco-dmo.org/id/dataset-parameter/999203.rdf
Name: Total_length_mm
Units: millimeters (mm)
Description: <p>Total length of phytoplankton chain</p>
http://lod.bco-dmo.org/id/dataset-parameter/999204.rdf
Name: Comments
Units: unitless
Description: <p>Comments or notes. On occasion, a phytoplankton chain extended beyond the field of view of the Zoocam, in which case the measurement was recorded with the comment "partially cropped."</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
https://doi.org/10.26008/1912/bco-dmo.999115.1
download
onLine
dataset
<p><em>Zooglider</em> was deployed in the western Mediterranean Sea between 20 March and 8 May 2023 as a part of the BioSWOT-Med program (Doglioli et al. 2024). It was initially released off the coast of Majorca, navigated to south of Menorca, then recovered at sea and redeployed in the center of an anticyclonic eddy north of Menorca. The shadowgraph imaging Zoocam on <em>Zooglider</em> was activated for dives 1-8 (Majorca, 30 March), dives 245-314 (south of Menorca, 24 April–3 May), and dives 353-389 (eddy, 4-8 May). <em>Zooglider</em> ascended at ~10 centimeters per second (cm/s) and the Zoocam sampled at 1 Hz throughout ascent, providing an image approximately every 10 cm of vertical travel. The 15 cm light path of the Zoocam is illuminated with a red LED (620-630 nm), imaging 250 milliliters (mL) per frame. Further details are in Ohman et al. (2018).</p>
<p>After flatfielding, Regions of Interest (ROIs) were segmented using a two step Canny edge detector (Ellen 2018, Ohman et al. 2018). ROIs were pre-classified using a Convolutional Neural Network (Ellen and Ohman 2024), then the classification of ROIs manually verified. In this verification process we observed numerous phytoplankton chains whose morphology was familiar, but whose dimensions were much greater than expected. We retrieved a subset of phytoplankton chains whose feret diameter was <u>&gt;</u> 2 millimeters (mm) for closer manual inspection. These ROIs were measured manually with an on-screen digital tool.</p>
Specified by the Principal Investigator(s)
<p>Data were tabulated and summary statistics calculated for each phytoplankton group.</p>
Specified by the Principal Investigator(s)
- Imported location data from CSV file "962204_v1_ohman_dive_record_zooglider_bioswot.csv", a related dataset from the same project.
- Imported phytoplankton data from original file "Giant_Phytoplankton_Measurements_v1.xlsx" into the BCO-DMO system, removing empty rows and treating "NaN" as missing values (missing values are empty/blank in the final CSV file).
- Joined location data into the phytoplankton table using "Dive_number" (source) matched to "Dive" (target) in half-outer mode, adding "latitude_mid_ascent_75" and "longitude_mid_ascent_75" columns.
- Renamed columns to comply with BCO-DMO naming conventions.
- Combined "Date" and "Time_CET" fields to create "ISO_DateTime_CET" datetime column formatted as %Y-%m-%dT%H:%M:%S (ISO 8601).
- Combined "Date" and "Time_CET" fields (input timezone CET) to create "ISO_DateTime_UTC" datetime column formatted as "%Y-%m-%dT%H:%M:%SZ" (ISO 8601), converted to UTC.
- Removed original "Date" and "Time_CET" columns.
- Applied a typo correction in the Taxon column: "Guindardia" replaced with "Guinardia".
- Saved the final file as "999115_v1_long_phytopl_chain_length_zoogl.csv".
Specified by BCO-DMO Data Managers
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
Zooglider SN51
Zooglider SN51
PI Supplied Instrument Name: Zooglider SN51 PI Supplied Instrument Description:Zooglider SN51, manufactured at the Scripps Institution of Oceanography Instrument Name: Zooglider Instrument Short Name: Instrument Description: Zooglider, designed and built at the Scripps Institution of Oceanography, as described in Ohman et al. (2019. Limnology and Oceanography-Methods 17: 69-86 doi 10.1002/lom3.10301). It is based on a Spray glider hull (Sherman et al. 2002. IEEE Journal of Oceanic Engineering 26: 437-446 doi 10.1109/48.972076), modified with custom optical and acoustic sampling instruments.
Cruise: BioSWOT-Med
BioSWOT-Med
R/V L'Atalante
Community Standard Description
International Council for the Exploration of the Sea
R/V L'Atalante
vessel
BioSWOT-Med
Andrea Doglioli
Aix-Marseille University
R/V L'Atalante
Community Standard Description
International Council for the Exploration of the Sea
R/V L'Atalante
vessel