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Bussmann, Ingeborg; Hackbusch, Steffen; Schaal, Patrick; Wichels, Antje (2016): Methane concentration and oxidation in the Lena Delta, September 2013. PANGAEA,, Supplement to: Bussmann, I et al. (2017): Methane distribution and oxidation around the Lena Delta in summer 2013. Biogeosciences, 14(21), 4985-5002,

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The Lena River is one of the biggest Russian rivers draining into the Laptev Sea. Due to predicted increasing temperatures, the permafrost areas surrounding the Lena Delta will melt at increasing rates. With this melting, high amounts of methane will reach the waters of the Lena and the adjacent Laptev Sea. Methane oxidation by methanotrophic bacteria is the only biological way to reduce methane concentrations within the system. However, the polar estuary of the Lena River is a challenging environment for bacteria, with strong fluctuations in salinity and temperature. We determined the activity (tracer method) and the abundance (qPCR) of aerobic methanotrophic bacteria. We described the methanotrophic population with MISA; as well as the methane distribution (head space) and other abiotic parameters in the Lena Delta in September 2013.
In 'riverine water' (S <5) we found a median methane concentration of 22 nM, in 'mixed water' (5 < S < 20) the median methane concentration was 19 nM and in 'polar water' (S > 20) a median 28 nM was observed. The Lena River was not the methane source for surface water, and bottom water methane concentrations were mainly influenced by the concentration in surface sediments. However, the methane oxidation rate in riverine and polar water was very similar (0.419 and 0.400 nM/d), but with a higher relative abundance of methanotrophs and a higher 'estimated diversity' with respect to MISA OTUs in the 'rivine water' as compared to 'polar water'. The turnover times of methane ranged from 167 d in 'mixed water', 91 d in 'riverine water' and only 36 d in 'polarwater'. Also the environmental parameters influencing the methane oxidation rate and the methanotrophic population differed between the water masses. Thus we postulate a riverine methanotrophic population limited by sub-optimal temperatures and substrate concentrations and a polar methanotrophic population being well adapted to the cold and methane poor environment, but limited by the nitrogen content. The diffusive methane flux into the atmosphere ranged from 4 -163 µmol m2 d-1 (median 24). For the total methane inventory of the investigated area, the diffusive methane flux was responsible for 8% loss, compared to only 1% of the methane consumed by the methanotrophic bacteria within the system.
Related to:
Dubinenkov, Ivan; Kraberg, Alexandra C; Bussmann, Ingeborg; Kattner, Gerhard; Koch, Boris P (2015): Physical oceanography and dissolved organic matter in the coastal Laptev Sea in 2013. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA,
Median Latitude: 73.039070 * Median Longitude: 129.647259 * South-bound Latitude: 71.741470 * West-bound Longitude: 127.316470 * North-bound Latitude: 74.060640 * East-bound Longitude: 132.466220
Date/Time Start: 2013-09-01T11:22:00 * Date/Time End: 2013-09-06T19:20:00
Minimum DEPTH, water: m * Maximum DEPTH, water: 27 m
T1-1302 * Latitude: 71.741470 * Longitude: 129.837060 * Date/Time: 2013-09-01T18:01:00 * Elevation: -6.0 m * Location: Laptev Sea * Campaign: Lena2013 (RU-Land_2013_Lena) * Basis: AWI Arctic Land Expedition * Method/Device: Multiple investigations (MULT)
T1-1303 * Latitude: 71.777220 * Longitude: 130.088000 * Date/Time: 2013-09-01T11:22:00 * Elevation: -12.0 m * Location: Laptev Sea * Campaign: Lena2013 (RU-Land_2013_Lena) * Basis: AWI Arctic Land Expedition * Method/Device: Multiple investigations (MULT)
T1-1304 * Latitude: 71.902000 * Longitude: 130.690000 * Date/Time: 2013-09-02T00:17:00 * Elevation: -15.0 m * Location: Laptev Sea * Campaign: Lena2013 (RU-Land_2013_Lena) * Basis: AWI Arctic Land Expedition * Method/Device: Multiple investigations (MULT)
Physical oceanography and dissolved organic matter from this cruise are published in Dubinenkov et al. (2015)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventBussmann, Ingeborg
2Date/Time of eventDate/TimeBussmann, Ingeborg
3Latitude of eventLatitudeBussmann, Ingeborg
4Longitude of eventLongitudeBussmann, Ingeborg
5Elevation of eventElevationmBussmann, Ingeborg
6DEPTH, waterDepth watermBussmann, IngeborgGeocode
7MethaneCH4nmol/lBussmann, Ingeborgin water
8MethaneCH4nmol/lBussmann, Ingeborgin surface sediment
9Turnover rate, methanek CH41/dayBussmann, IngeborgRadio 3H-CH4 tracer techniqueaverage
10Turnover rate, standard deviationk std dev±Bussmann, IngeborgRadio 3H-CH4 tracer technique
11Methane oxidation rateMOXnmol/l/dayBussmann, IngeborgRadio 3H-CH4 tracer techniqueaverage
12Methane oxidation rate, standard deviationMOX std dev±Bussmann, IngeborgRadio 3H-CH4 tracer technique
13Bacteria, methane oxidizingMOB%Bussmann, IngeborgQuantitative real-time polymerase chain reaction (q-PCR)percentage of MOB-DNA of total extracted DNA
180 data points

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