Data · collection
Thorium-234 Activity in Particulate and Dissolved Components Measured during the U.S. JGOFS Arabian Sea Process Study
Listed in NASA Earthdata CMR
A component of U.S. Joint Global Ocean Flux Study (JGOFS) is the Arabian Sea Process Study.
Description
Eleven cruises took place aboard the R/V Thomas G. Thompson for about sixteen months from October 1994 until January 1996. These cruises provided seasonal coverage of the annual monsoon and inter-monsoon cycles in the area southeast of Oman - from where the cruises were staged.
The monsoons of the Arabian Sea drive a uniquely intense carbon cycling system, and it is the goal of JGOFS to better understand the role of the oceans in global carbon cycling. Thorium-234 can be used as a tracer to estimate particle and carbon fluxes and cycling rates. Water samples were collected by in situ pump, the Slurper.
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At every station, samples were collected at the surface. At long stations, samples were collected at discrete depth levels. At intermediate and long stations, 0-100m composite samples were collected.
In addition to gamma and beta counting to determine thorium activities, CHN analysis was performed to determine particulate organic carbon (POC) and particulate organic nitrogen (PON) concentrations. Particulate thorium, POC and PON are fractionated into 2 size fractions: greater than 53 microns, and 1-53 microns. Thorium-234 activities are measured in decays per minute per liter (dpm/l).
POC and PON are measured in micromoles per liter (umol/l). The data is public domain and can be retrieved on-line at "usjgofs.whoi.edu/jg/dir/jgofs/" [This information was obtained from the U.S. JGOFS website and from the Cafe Thorium website at WHOI.]
Links
Get the data
- Access US JGOFS data usjgofs.whoi.edu/jg/dir/jgofs ↗
download · from NASA CMR
Documentation and papers
- US JGOFS Home Page usjgofs.whoi.edu ↗
documentation · from NASA CMR
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214605798-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214605798-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Biogeochemical Cycles · Carbon · Carbon, Hydrogen, Nitrogen Analyzers · GAMMA RADIATION DETECTOR · Particulate Organic Carbon · Particulate Organic Nitrogen · Poc · Pon · SHIPS · Thorium-234 · Thorium-234 · Thorium-234
- Inferred from text
- Climate change science 71%
Provenance · 1 source records, 20 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214605798-SCIOPS | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].anzsrc:group:3702 | enrichment · NASA CMR | taxonomy-embedding@1.1.0 | title+keywords+description (71%) |
| concepts[instrument].gcmd_instrument:chn-analyzers | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:gamma-radiation-detector | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/biogeochemical-cycles | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/carbon | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/nitrogen/particulate-organic-nitrogen | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/nitrogen/pon | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/ocean-tracers/thorium-234 | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/organic-carbon/particulate-organic-carbon | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/organic-carbon/poc | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/radionuclides/thorium-234 | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/trace-elements/thorium-234 | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:ships | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| license_text | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |