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Biogeochemistry — BCO-DMO and cruise-based observations

Find biological and chemical oceanography datasets from research cruises and NSF-funded projects.

What this teaches

  • The BCODM collection (Biological & Chemical Oceanography DMO at WHOI)
  • Combining cruise data with satellite remote-sensing for context
  • Using q to scope by analyte (chlorophyll, nitrate, oxygen, alkalinity, etc.)

Sources used: BCODM, WOD

Prompt

Find biogeochemistry datasets — nitrate, oxygen, alkalinity, primary
production — from research cruises in the North Atlantic. Prefer
recent NSF-funded studies.

Transcript

1. Search BCO-DMO with free-text + bbox

search_datasets(
  collections = "BCODM",
  q = "nitrate alkalinity primary production",
  bbox = "-80,25,-30,55",
  limit = 5
)

Returns 0 items. The multi-word free-text search across BCODM titles/descriptions doesn't match this combination. AQUAVIEW's BCODM indexing in this bbox is sparse — the search needs to drop q and inspect all the available items.

2. Drop the free-text — see what BCO-DMO actually covers

search_datasets(
  collections = "BCODM",
  bbox = "-80,25,-30,55",
  limit = 5
)

Returns 6 items total. Top hits (real responses):

ID Title summary Period
bcodmo_dataset_3918 BATS / Hydrostation S CTD profiles — Bermuda Atlantic Time-Series, decibar-averaged CTD with pressure, T, S, dissolved O2, beam attenuation, fluorescence, PAR 1988 → ongoing
bcodmo_dataset_937008_v1 BAIT — Aerosol Fe stable-isotope composition at Tudor Hill, Bermuda Nov 2018–Mar 2020
bcodmo_dataset_781545 AE1918 cruise — continuous MOCNESS net-tow data, R/V Atlantic Explorer Jul 2019
bcodmo_dataset_780092 Squidpop predation experiment, Back Sound, NC Jul 2017
bcodmo_dataset_777838 AE1910 cruise — MOCNESS continuous data May 2019

The standout is BATS (bcodmo_dataset_3918) — the Bermuda Atlantic Time-Series, monthly CTD profiles at 31° 40' N 64° 10' W since 1988, plus biweekly cruises to Hydrostation S (32° 10' N, 64° 30' W).

3. Cross-source: World Ocean Database for archival profiles

search_datasets(
  collections = "WOD",
  bbox = "-80,25,-30,55",
  q = "oxygen",
  limit = 5
)

WOD complements BCO-DMO with multi-decade bottle, CTD, and float profile data — the long-term reference for biogeochemical analytes.

Result the agent gave

"For North Atlantic biogeochemistry, BCO-DMO's coverage in AQUAVIEW is sparse — only 6 items match the bbox -80°W to -30°W, 25°N to 55°N, and the multi-word free-text query for 'nitrate alkalinity primary production' returns zero (BCO-DMO titles use project-name framing, not analyte names).

The most valuable item by far is bcodmo_dataset_3918 — the Bermuda Atlantic Time-Series (BATS) CTD profile dataset. Monthly hydrographic cruises to 31° 40' N, 64° 10' W since 1988, plus biweekly cruises to a neighboring location (Hydrostation S, 32° 10' N, 64° 30' W). Variables: pressure, depth, temperature, conductivity, salinity, dissolved oxygen, beam attenuation, fluorescence, PAR. ERDDAP: https://erddap.bco-dmo.org/erddap.

Other items in the bbox are project-specific (BAIT aerosol Fe isotopes, MOCNESS net tows from R/V Atlantic Explorer, a North Carolina squidpop predation experiment) — useful for specific research questions, less for survey-style biogeochemistry.

Caveat*: BCO-DMO's full North Atlantic catalog is far larger than 6 datasets. AQUAVIEW's coverage of BCO-DMO is partial; for a complete catalog search, use BCO-DMO's own portal at https://www.bco-dmo.org/. For a multi-decade complement, the World Ocean Database (WOD)* has bottle, CTD, and float profiles back to 1770 with broader analyte coverage."

Variations

  • Different region: California Current -127,32,-117,42, North Pacific -180,30,-130,60.
  • Specific PI / project: include the PI's last name in q — BCO-DMO records often title datasets by lead investigator.
  • Specific analyte: e.g., q = "alkalinity" for ocean acidification context.