Steinfeldt, Reiner; Rhein, Monika (2015): Noble gases measured on water bottle samples during METEOR cruise M91 [dataset]. Institut für Umweltphysik, Universität Bremen, PANGAEA, https://doi.org/10.1594/PANGAEA.845703
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Related to:
Sültenfuß, Jürgen; Roether, Wolfgang; Rhein, Monika (2009): The Bremen mass spectrometric facility for the measurement of helium isotopes, neon, and tritium in water. Isotopes in Environmental and Health Studies, 45(2), 83-95, https://doi.org/10.1080/10256010902871929
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 27542298: Climate - Biogeochemistry Interactions in the Tropical Ocean
Coverage:
Median Latitude: -10.945595 * Median Longitude: -78.677089 * South-bound Latitude: -16.155830 * West-bound Longitude: -82.000330 * North-bound Latitude: -4.999670 * East-bound Longitude: -75.332330
Date/Time Start: 2012-12-03T15:53:00 * Date/Time End: 2012-12-23T20:13:00
Minimum DEPTH, water: 3.38 m * Maximum DEPTH, water: 202.79 m
Event(s):
M91_1713-3 (CTD-003) * Latitude: -4.999670 * Longitude: -82.000330 * Date/Time: 2012-12-03T15:53:00 * Elevation: -5285.5 m * Location: South Pacific Ocean * Campaign: M91 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M91_1714-1 (CTD-004) * Latitude: -5.000000 * Longitude: -81.830170 * Date/Time: 2012-12-03T19:12:00 * Elevation: -4557.3 m * Location: South Pacific Ocean * Campaign: M91 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M91_1715-3 (CTD-006) * Latitude: -5.000170 * Longitude: -81.670330 * Date/Time: 2012-12-04T01:12:00 * Elevation: -2828.6 m * Location: South Pacific Ocean * Campaign: M91 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
Comment:
Coastal upwelling regions as the research area of the Metor cruise M91 off Peru belong to the most productive regions of the world ocean. Oceanic upwelling velocities, however, are too small to be measured directly. We will thus exploite the deviations of the helium-3/helium-4 ratio from the atmospheric solubility equilibrium in the case of upwelling to infer the vertical velocities. This method has already been applied in the equatorial eastern Atlantic and the coastal region off Mauritania. The resulting vertical velocities will be compared with Ekman theory. In conjunction with other measurements perfomed during M91, the upwelling velocities can be used to estimate advective transport of heat, nutrients and climate relevant trace gases into the mixed layer.
Measurement and scientific evaluation of the helium data will be done in the framework of the German project SOPRAN (phase III).
335 helium samples in copper tubes have been taken from the Niskin bottles. Sampling focuses on the mixed layer and the upper 200 m of the water column. The aim of the sampling strategy is to minimize the error of the mixed layer concentration of helium-3 and to get mean values of the helium-3 concentration and gradient below the surface in order to estimate the advective and diffusive input of helium-3 into the mixed layer.
In a first step, the gas has to be extracted from the water stored in the copper tubes, and this gas will then be transferred to a high resolution mass spectrometer. In addition to the helium isotopes helium-3 and helium-4, also the neon concentration of the water samples will be analysed.
See "Further details:" for information on measurement technique.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Steinfeldt, Reiner | |||
| 2 | Date/Time of event | Date/Time | Steinfeldt, Reiner | |||
| 3 | Latitude of event | Latitude | Steinfeldt, Reiner | |||
| 4 | Longitude of event | Longitude | Steinfeldt, Reiner | |||
| 5 | Elevation of event | Elevation | m | Steinfeldt, Reiner | ||
| 6 | DEPTH, water | Depth water | m | Steinfeldt, Reiner | Geocode | |
| 7 | Pressure, water | Press | dbar | Steinfeldt, Reiner | ||
| 8 | Helium | He | nmol/kg | Steinfeldt, Reiner | Mass spectrometer, noble gas, MAP215-50 | http://www.noblegas.uni-bremen.de |
| 9 | δ Helium-3 | δ3He | % | Steinfeldt, Reiner | ||
| 10 | Neon | Ne | nmol/kg | Steinfeldt, Reiner | ||
| 11 | Profile ID | Profile ID | Steinfeldt, Reiner | |||
| 12 | Bottle number | Bottle | Steinfeldt, Reiner |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1635 data points