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OAS accession Detail for 0291425
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| accessions_id: | 0291425 | archive |
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| Title: | Hydrothermal sediment temperature profiles sampled near Beggiatoa mats using Alivn's heatlow and temperature probes, deployed from R/V Atlantis cruises AT15-40, AT15-56 in the Guaymas Basin from 2008-2009 (NCEI Accession 0291425) |
| Abstract: | This dataset contains physical data collected on Alvin and R/V Atlantis during cruises AT15-40 and AT15-56 and deployments AT15-40_Alvin_Dives and AT15-56_Alvin_Dives in the Gulf of California from 2008-12-06 to 2009-12-04. These data include depth and water temperature. The instruments used to collect these data include Alvin Heatflow Probe 0.66m and Alvin High Temperature Probe. These data were collected by Andreas Teske, Barbara J. MacGregor, Christopher S. Martens, and Daniel B. Albert of University of North Carolina at Chapel Hill as part of the "Microbial carbon and sulfur cycling in the hydrothermally altered sediments of Guaymas Basin (Guaymas Basin Vents)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2023-01-10. The following is the text of the dataset description provided by BCO-DMO: Hydrothermal sediment temperature profiles near Beggiatoa mats Dataset Description: In-situ temperature profiles of Guaymas Basin hydrothermal sediments (Southern Spreading segment, 27°00.44N and 111°24.55W; 2000 m water depth). Geochemical and temperature data from Guaymas sediments are published or referenced in Biddle et al. (2012) and McKay et al. (2012). |
| Date received: | 20230110 |
| Start date: | 20081206 |
| End date: | 20091204 |
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| West boundary: | -111.415 |
| East boundary: | -111.404 |
| North boundary: | 27.012 |
| South boundary: | 27.006 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Supplementary information: | Acquisition Description: During Alvin dives 4483-4492 (Dec 6-17, 2008) and 4562-4573 (Nov 22-Dec 6, 2009) in the 2000 meters (m) deep Southern Guaymas trench, 113 temperature profiles were taken in sediments near and within Beggiatoa mats, at the hydrothermally active areas from 27°N00.30 to 27°N00.60, and 111°W24.65 to 111°W24.35. All temperature probe measurements, positions of the 139 probes in the mat, and penetration depths were checked with the Alvin dive videotapes that provide a continuous record of all dive operations. Of the 113 temperature profiles, 78 were measured in mats with both orange and white filaments to focus on the relationship between differently colored Beggiatoa . A Heatflow probe manufactured by the Woods Hole Oceanographic Institution (WHOI) was used to measure 69 of the 78 temperature profiles. This is a 0.6 m titanium tube containing a linear heater and five thermistors (type 44032, Omega Engineering, Inc.) at 10-centimeter (cm) intervals along the length of the tube (personal communication with Lane J. Abrams, WHOI). The thermistors have a tolerance of +/- 0.2 up to 40 degrees Celsius (C), and +/- 1 degree C up to 200 degrees C. It is considered fully inserted when a disc at the base reaches the sediment surface, and takes temperature readings at 0, 10, 20, 30, and 40 centimeters below seafloor (cmbsf). For 28 profiles, 5 cm depth resolution was achieved by first inserting the probe 5 cm less than complete insertion and recording one profile, and then inserting the probe the rest of the way and recording a second profile, 5 cm offset from the first. Temperatures were recorded after the readings had stabilized for each of the five depths. Occasionally, this technique resulted in channel formation, and the second set of readings was higher than the first. During dive 4490, one temperature profile was repeated three times, giving a range of sensor precisions from 1.0 to 4.1 C. A high-temperature probe was used to produce nine additional temperature profiles with varying depth intervals from the sediment surface down to 37.5 cmbsf. The high-temperature probe has a type-K thermocouple located at the tip, with a tolerance of +/-3 degrees C up to 400 degrees C. To measure temperature profiles with this probe, the tip touched the sediment surface for the first reading before inserting the probe sequentially to desired depths and taking readings. |
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| Metadata version: | 1 |
| Keydate: | 2024-04-20 19:31:41+00 |
| Editdate: | 2024-04-20 19:32:13+00 |