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Steinle, Lea; Maltby, Johanna; Treude, Tina; Kock, Annette; Bange, Hermann W; Niemann, Helge (2017): Physico-chemical data including methane concentrations, as well as methane oxidation rates, measured at time-series station Boknis Eck (Baltic Sea) from 2012-2014. PANGAEA, https://doi.org/10.1594/PANGAEA.871890, Supplement to: Steinle, Lea; Maltby, Johanna; Treude, Tina; Kock, Annette; Bange, Hermann W; Engbersen, Nadine; Zopfi, Jakob; Lehmann, Moritz F; Niemann, Helge (2017): Effects of low oxygen concentrations on aerobic methane oxidation in seasonally hypoxic coastal waters. Biogeosciences, 14(6), 1631-1645, https://doi.org/10.5194/bg-14-1631-2017

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Abstract:
Coastal seas may account for more than 75% of global oceanic methane emissions. There, methane is mainly produced microbially in anoxic sediments from where it can escape to the overlying water column. Aerobic methane oxidation (MOx) in the water column acts as a biological filter reducing the amount of methane that eventually evades to the atmosphere. The efficiency of the MOx filter is potentially controlled by the availability of dissolved methane and oxygen, as well as temperature, salinity, and hydrographic dynamics, and all of these factors undergo strong temporal fluctuations in coastal ecosystems. In order to elucidate the key environmental controls, specifically the effect of oxygen availability, on MOx in a seasonally stratified and hypoxic coastal marine setting, we conducted a 2-year time-series study with measurements of MOx and physico-chemical water column parameters in a coastal inlet in the southwestern Baltic Sea (Eckernförde Bay). We found that MOx rates generally increased toward the seafloor, but were not directly linked to methane concentrations. MOx exhibited a strong seasonal variability, with maximum rates (up to 11.6 nmol l-1 d-1) during summer stratification when oxygen concentrations were lowest and bottom-water temperatures were highest. Under these conditions, 70-95% of the sediment-released methane was oxidized, whereas only 40-60% were consumed during the mixed and oxygenated periods. Laboratory experiments with manipulated oxygen concentrations in the range of 0.2-220 µmol l-1 revealed a sub-micromolar oxygen-optimum for MOx at the study site. In contrast, the fraction of methane-carbon incorporation into the bacterial biomass (compared to the total amount of oxidised methane) was up to 38-fold higher at saturated oxygen concentrations, suggesting a different partitioning of catabolic and anabolic processes under oxygen-replete and oxygen-starved conditions, respectively. Our results underscore the importance of MOx in mitigating methane emission from coastal waters and indicate an organism-level adaptation of the water column methanotrophs to hypoxic conditions.
Coverage:
Latitude: 54.529500 * Longitude: 10.039330
Date/Time Start: 2012-10-17T10:23:36 * Date/Time End: 2014-09-17T10:01:40
Minimum DEPTH, water: 0.9 m * Maximum DEPTH, water: 26.3 m
Event(s):
Boknis_Eck_1957 * Latitude: 54.529500 * Longitude: 10.039330 * Date/Time: 1957-04-30T00:00:00 * Device: CTD/Rosette (CTD-RO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DATE/TIMEDate/TimeSteinle, LeaGeocode
2Bottle numberBottleSteinle, Lea
3DEPTH, waterDepth watermSteinle, LeaGeocode
4Temperature, waterTemp°CSteinle, Lea
5SalinitySalSteinle, LeaPSU
6OxygenO2µmol/lSteinle, Lea
7MethaneCH4nmol/lSteinle, Lea
8Methane, standard deviationCH4 std dev±Steinle, Lea
9Turnover rate, methane oxidationk MOX1/daySteinle, Lea
10Turnover rate, standard deviationk std dev±Steinle, Lea
11Methane oxidation rateMOXnmol/l/daySteinle, Lea
12Methane oxidation rate, standard deviationMOX std dev±Steinle, Lea
Size:
478 data points

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