Data · collection
Thorium-234 Activity in Particulate and Dissolved Components 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-234 can be used as a tracer to estimate particle and carbon fluxes and cycling rates. Water samples were collected by in situ pump at various depths at the stations.
Dissolved thorium-234 was measured by non-destructive gamma spectrometry. Particulate thorium-234 was measured in three different size classes: 0.7-1 micrometer, 1-53 micrometer, and >53 micrometer by low-level beta counting. The thorium-234 data were only collected during the second (TT008) and fourth (TT012) cruises.
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/C1214605746-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214605746-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Biogeochemical Cycles · GAMMA RAY SPECTROMETERS · PARTICLE SPECTROMETERS · SHIPS · SPECTROMETERS · Stable Isotopes · Thorium-234 · Thorium-234 · Thorium-234 · Trace Elements
Provenance · 1 source records, 16 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214605746-SCIOPS | 15 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-234 | 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/stable-isotopes/thorium-234 | 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[measured_variable].gcmd:earth-science/terrestrial-hydrosphere/water-quality-water-chemistry/isotopes/stable-isotopes | 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 |
| 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 |