<div><p>Water samples were transferred from Niskin bottles and stored in crimped copper tubing. Gases were extracted from the water samples in a shore-based vacuum system and stored in aluminosilicate glass ampoules. The extracted gases were analyzed for helium and neon concentrations using ion counting in a quadrupole mass spectrometer and for helium isotopes using a magnetic sector dual-collecting isotope ratio mass spectrometer. Details are given in Jenkins et al. (2019) and Stanley et al. (2007).</p>
<p>Note: Natural and bomb tritium will decay to 3He in the copper tubing water sample container between the time the water sample was acquired and when the gases were extracted. We account for this using tritium concentrations estimated from a prior (2015) cruise occupation extrapolated in time and interpolated in space to the sample location and time. The size of this effect is significant in shallow, northern waters and vanishingly small in deeper and more southerly waters.</p>
<p>SPECIAL NOTE: The sample obtained from Station 21, Cast 11, Bottle 1 (5440 dbar) is excluded because the helium and nutrient results clearly indicate that tbe bottle has either pre/post-tripped or leaked and is not representative of the other bottles tripped at/near this depth. To our knowledge, ODF has not flagged this bottle as invalid, so be aware that any results from this particular water sample (station/cast/bottle) should be ignored.</p>
<p> </p></div>
GP15 He Isotope C(He) and C(Ne) - Leg 2
GP15 He Isotope C(He) and C(Ne) - Leg 2
<div><p><strong>Data Processing:</strong><br />
Raw data were acquired and reduced using custom software written in VB.NET. Data were processed using MATLAB (2020b) and stored in a PostgreSQL V9.3 database.</p>
<p><strong>BCO-DMO Processing:</strong><br />
- renamed fields to comply with BCO-DMO naming conventions; - converted date field to YYYY-MM-DD format; - added date/time field in ISO8601 format; - removed empty columns.</p></div>
862220
GP15 He Isotope C(He) and C(Ne) - Leg 2
2021-09-30T16:03:54-04:00
2021-09-30T16:03:54-04:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:862220
Helium isotope with helium and neon concentration data from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018
This dataset includes helium isotope, helium, and neon concentration data from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018.
false
Jenkins, W. J., German, C. R. (2021) Helium isotope with helium and neon concentration data from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2021-09-30 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.862220.1 [access date]
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1
10.26008/1912/bco-dmo.862220.1
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2021-09-30
Datapackage.json
Frictionless Data Package
https://www.bco-dmo.org/dataset/862220/datapackage.json
application/vnd.datapackage+json
PDF
https://www.bco-dmo.org/dataset/862220/Dataset_description.pdf
application/pdf
ISO 19115-2 (NOAA Profile)
https://www.bco-dmo.org/dataset/862220/iso
application/xml
http://www.isotc211.org/2005/gmd-noaa
Dublin Core
https://www.bco-dmo.org/dataset/862220/dublin-core
application/xml
http://purl.org/dc/elements/1.1/
862220
http://lod.bco-dmo.org/id/dataset/862220
2018-10-25 - 2018-11-23
2018-10-25
2018-10-25
---25
297
--10
2018
2018-11-23
2018-11-23
---23
326
--11
2018
OSPREY
http://www.opengis.net/def/crs/OGC/1.3/CRS84
<http://www.opengis.net/def/crs/OGC/1.3/CRS84> POLYGON((-155.258 -20, -151.986 -20, -151.986 -20, -151.986 18.906, -155.258 18.906, -155.258 -20))
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