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Hawkes, Jeffrey A; Rossel, Pamela E; Stubbins, Aron; Butterfield, David A; Connelly, Douglas P; Achterberg, Eric Pieter; Koschinsky, Andrea; Chavagnac, Valerie; Hansen, Christian T; Bach, Wolfgang; Dittmar, Thorsten (2015): Deep-Ocean dissolved organic matter in hydrothermal vents. PANGAEA, https://doi.org/10.1594/PANGAEA.867501, Supplement to: Hawkes, JA et al. (2015): Efficient removal of recalcitrant deep-ocean dissolved organic matter during hydrothermal circulation. Nature Geoscience, 8(11), 856-860, https://doi.org/10.1038/ngeo2543

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Abstract:
Oceanic dissolved organic carbon (DOC) is an important carbon pool, similar in magnitude to atmospheric CO2, but the fate of its oldest forms is not well understood (Dittmar and Stubbins, 2014; Hansell, 2013, doi:10.1146/annurev-marine-120710-100757). Hot hydrothermal circulation may facilitate the degradation of otherwise un-reactive dissolved organic matter, playing an important role in the long-term global carbon cycle. The oldest, most recalcitrant forms of DOC, which make up most of oceanic DOC, can be recovered by solid-phase extraction. Here we present measurements of solid-phase extractable DOC from samples collected between 2009 and 2013 at seven vent sites in the Atlantic, Pacific and Southern oceans, along with magnesium concentrations, a conservative tracer of water circulation through hydrothermal systems. We find that magnesium and solid-phase extractable DOC concentrations are correlated, suggesting that solid-phase extractable DOC is almost entirely lost from solution through mineralization or deposition during circulation through hydrothermal vents with fluid temperatures of 212-401 °C. In laboratory experiments, where we heated samples to 380 °C for four days, we found a similar removal efficiency. We conclude that thermal degradation alone can account for the loss of solid-phase extractable DOC in natural hydrothermal systems, and that its maximum lifetime is constrained by the timescale of hydrothermal cycling, at about 40 million years (Elderfield and Schultz, 1996, doi:10.1146/annurev.earth.24.1.191).
Coverage:
Median Latitude: 10.880999 * Median Longitude: -75.845948 * South-bound Latitude: -56.088930 * West-bound Longitude: 130.763330 * North-bound Latitude: 48.000000 * East-bound Longitude: -30.188980
Date/Time Start: 2001-07-21T00:13:00 * Date/Time End: 2011-07-31T05:22:00
Minimum Elevation: -3034.0 m * Maximum Elevation: -800.0 m
Event(s):
AMK47-Lost_City * Latitude: 30.125000 * Longitude: -42.117000 * Elevation: -800.0 m * Location: Lost City Hydrothermal Field, Mid-Atlantic Ridge * Campaign: AMK47 * Basis: Akademik Mstislav Keldysh * Device: MIR deep-sea manned submersible (MIR)
J2-574 * Latitude: 47.900000 * Longitude: -129.000000 * Date/Time: 2001-07-21T00:13:00 * Elevation: -2192.0 m * Campaign: AT18-08 * Basis: Atlantis (1997) * Device: Remote operated vehicle Jason II (ROVJ)
J2-575 * Latitude: 47.900000 * Longitude: -129.000000 * Date/Time: 2011-07-21T16:23:00 * Elevation: -2203.0 m * Campaign: AT18-08 * Basis: Atlantis (1997) * Device: Remote operated vehicle Jason II (ROVJ)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEventHawkes, Jeffrey A
2Latitude of eventLatitudeHawkes, Jeffrey A
3Longitude of eventLongitudeHawkes, Jeffrey A
4IdentificationIDHawkes, Jeffrey A
5Ocean and sea regionOS regionHawkes, Jeffrey A
6SiteSiteHawkes, Jeffrey Avent
7NameNameHawkes, Jeffrey Avent
8Sampling dateSampling dateHawkes, Jeffrey Ayear
9Sample typeSamp typeHawkes, Jeffrey A
10TypeTypeHawkes, Jeffrey Aflow
11Lithology/composition/faciesLithologyHawkes, Jeffrey A
12DescriptionDescriptionHawkes, Jeffrey Ageochemistry
13MagnesiumMgmmol/lHawkes, Jeffrey A
14Carbon, organic, dissolvedDOCµmol/lHawkes, Jeffrey A
15PrecisionPrecipHawkes, Jeffrey ADOC [µmol/l]
16Solid phase extractableSPEµmol/lHawkes, Jeffrey A
17PrecisionPrecipHawkes, Jeffrey ASPE [µmol/l]
18Sample volumeSamp volmlHawkes, Jeffrey A
19VolumeVolmlHawkes, Jeffrey Aextracted
20FactorFactorHawkes, Jeffrey AExtract dilution factor for SPEDOC analysis
21Carbon, organic, dissolved, extractedDOC extrµmol/lHawkes, Jeffrey ASPEDOC in extract
22ErrorErrorHawkes, Jeffrey ASPEDOC in extract
23Carbon, organic, dissolved, extractedDOC extrµmol/lHawkes, Jeffrey AProcedural SPEDOC extract blank
24PrecisionPrecipHawkes, Jeffrey AExtract Blank precision
25ErrorErrorHawkes, Jeffrey AExtract blank error [µmol/l]
26Carbon, organic, dissolved, extractedDOC extrµmol/lHawkes, Jeffrey ASPEDOC extract blank subtracted
27ErrorErrorHawkes, Jeffrey AExtract error [µmol/l]
28Carbon, organic, dissolved, extractedDOC extrµmol/lHawkes, Jeffrey ASPEDOC
29ErrorErrorHawkes, Jeffrey ASPEDOC error
30PercentagePerc%Hawkes, Jeffrey A
31ContaminationContaminationHawkes, Jeffrey A
32CommentCommentHawkes, Jeffrey ABulk DOC quality control
33Comment 2 (continued)Comm 2Hawkes, Jeffrey AReason for omission from paper
Size:
4130 data points

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