Data · collection
Thorium and Radium Isotope Concentrations Measured during the JGOFS Equatorial Pacific Process Study (EQPAC)
Listed in NASA Earthdata CMR
The Equatorial Pacific Process Study (EQPAC) was conducted along 140 deg W longitude during 1992.
Description
Four cruises took place: February 3 - March 9, March 19 - April 15, August 5 - September 18, and September 24 - October 21. A fifth benthic cruise and sediment trap legs were added.
During the first cruise (TT007), 15 stations were occupied along 140 deg W longitude from 12 deg N latitude to 12 deg S latitude. During the second cruise (TT008), data were collected at 8 stations along 140 deg W longitude from 9 deg S latitude to 9 deg N latitude. During the third cruise (TT011), data were collected at 15 stations along 140 deg W from 12 deg N latitude to 12 deg S latitude.
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During the fourth cruise (TT012), data were collected at 5 stations along 140 deg W longitude from 17 deg S latitude to the equator. Thorium and radium isotope concentrations were measured on two of the cruises: TT007 and TT012. A Multiple Unit Large Volume in situ Filtration System (MULVFS) was used to obtain samples from approximate depths of 0, 25, 50, 95, 140, 215, 340, 440, 535, 630 and 800 meters.
Radium-226 was measured by gamma spectrometry. Thorium-228 and thorium-230 were measured by alpha spectrometry and accelerator mass spectrometry. Radium-228 was measured by alpha spectrometry after 1 year via the ingrown thorium-228.
The data is public domain and can be retrieved on-line at "usjgofs.whoi.edu/jg/dir/jgofs/" [The information in this summary was taken from the JGOFS World Wide Web pages.]
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/C1214605574-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214605574-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Biogeochemical Cycles · GAMMA RAY SPECTROMETERS · PARTICLE SPECTROMETERS · SHIPS · SPECTROMETERS · Thorium · Thorium · Thorium · Trace Elements
- Inferred from text
- Mass spectrometry 75%
Provenance · 1 source records, 16 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214605574-SCIOPS | 10 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:gamma-ray-spectrometers | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:particle-spectrometers | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:spectrometers | 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/ocean-tracers/thorium | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/radionuclides/thorium | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/stable-isotopes/thorium | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-chemistry/trace-elements | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[modality].local:modality:mass-spectrometry | enrichment · NASA CMR | keyword-concept-rules@1.0.0 | title+description (75%) |
| 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 |
| 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 |