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Loginova, Alexandra; Kowalczuk, Piotr; Wünsch, Urban (2024): Molecular weight of dissolved organic matter in sediments of the Baltic Sea [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.967076 (DOI registration in progress)

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Abstract:
Pore water dissolved organic matter average weighted apparent molecular weight (AMW) and abundancies of molecular weight (MW) fractions obtained by Gaussian decomposition of size exclusion chromatograms from pore water samples collected using Rhizon samplers from the water 2 cm above the water-sediment interface and the top 10 cm of the sediment cores at 2cm interval. The sediment cores were recovered using a GeMax sampler. These samples were collected between 2020 and 2021 during cruises onboard RV Oceania (Institute of Oceanology of the Polish Academy of Sciences), which took place in spring, autumn, and winter, to the Central and Southern Baltic Sea, i.e., Eastern Gotland Basin, Bornholm Basin, and Gdansk Basin. The pore water dissolved organic matter molecular weight was used for further evaluation of the sediment flux of dissolved organic carbon. The molecular weight fractionation was used for characterizing pore-water dissolved organic matter in the Baltic Sea sediments.
AMW (Da) - averaged weighted apparent molecular weight. Molecular weight was measured by size exclusion chromatography (SEC) using a Shimadzu Nexera X2 UFLC system equipped with a TSKgel SuperAWM-H column. Dissolved organic matter was eluted with 0.15 M ammonium acetate (pH 7), and two sequential detectors were used. Absorbance was measured between 240 and 600 nm at 2 nm intervals using a Shimadzu SPD-M30. Retention times were converted to apparent molecular size based on a calibration curve using polystyrene sulfonate standards. For AMW, a spectral slope value between 275 and 295 nm (S275-295) was evaluated for each absorbance spectrum using log-transformed linear regression during SEC analyses at every second of retention time. The retention time was then converted into apparent MW after calibration and weighted average molecular weight (MW) was inferred. Abundances of low molecular weight (LMW), medium molecular weight (MMW), and high molecular weight (HMW) in the Dalton*Absorbance Unit were calculated by fractionation of MW chromatograms using absorption at 350nm signal. For this, each SEC-absorbtion chromatogram was fitted with three Gaussian peaks using "peakfit" function in MATLAB (MathWorks®). The three peaks were referenced as LMW for peaks centered at retention times equivalent to MW ~100-500 Da, MMW for the peaks centered at retention times equivalent to MW of ~500Da -1 kDa, and HMW for peaks centered at retention times equivalent to MW larger than 1 kDa for further analyses. The areas under the Gaussian peaks were referred to as abundancies of corresponding MW fractions.
Keyword(s):
Dissolved Organic Matter; molecular mass; pore waters
Supplement to:
Terzić, Elena; Zabłocka, Monika; Loginova, Alexandra N.; Borzycka, Karolina; Kowalczuk, Piotr (2024): Estimation of net accumulation and removal of fluorescent dissolved organic matter in different Baltic Sea water masses. Frontiers in Marine Science, 11, 1379604, https://doi.org/10.3389/fmars.2024.1379604
Funding:
EEA and Norway Grants, grant/award no. 2020/37/K/ST10/03018: Microbial Dissolved Organic Matter utilisation at the near-sediment waters in the Baltic Sea Deeps
National Science Center - Poland (NCN), grant/award no. 2019/33/B/ST10/01232: Estimation of the diffusion coefficient of dissolved organic matter from sediments to overlying waters through relationships between its optical and chromatographic characteristics and dissolved iron in Baltic Sea deeps
Coverage:
Median Latitude: 55.101879 * Median Longitude: 18.242111 * South-bound Latitude: 54.440000 * West-bound Longitude: 15.299300 * North-bound Latitude: 57.334000 * East-bound Longitude: 20.050400
Date/Time Start: 2020-03-06T07:03:00 * Date/Time End: 2021-04-20T06:04:00
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 0.09 m
Event(s):
2020_Mar_opt_M1  * Latitude: 54.750000 * Longitude: 19.300000 * Date/Time: 2021-03-08T12:03:00 * Elevation: -98.0 m * Location: Baltic Sea * Method/Device: Core (CORE)
2020_Mar_opt_P1  * Latitude: 54.830000 * Longitude: 19.320000 * Date/Time: 2021-03-08T07:03:00 * Elevation: -104.0 m * Location: Baltic Sea * Method/Device: Core (CORE)
2020_Mar_opt_P104bw  * Latitude: 54.580000 * Longitude: 19.180000 * Date/Time: 2021-03-05T09:03:00 * Elevation: -78.0 m * Location: Baltic Sea * Method/Device: Core (CORE)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
Event labelEventLoginova, Alexandra
Latitude of eventLatitudeLoginova, Alexandra
Longitude of eventLongitudeLoginova, Alexandra
Date/Time of eventDate/TimeLoginova, Alexandra
Elevation of eventElevationmLoginova, Alexandra
Station labelStationLoginova, Alexandra
Cruise/expeditionExpeditionLoginova, Alexandra
DEPTH, sediment/rockDepth sedmLoginova, AlexandraGeocode
Molecular massMuLoginova, Alexandrasee description in data abstractAbundance LMW (Da AU)
10 Molecular massMuLoginova, Alexandrasee description in data abstractAbundance MMW (Da AU)
11 Molecular massMuLoginova, Alexandrasee description in data abstractAbundance HMW (Da AU)
12 Molecular massMuLoginova, Alexandrasee description in data abstractAMW (Da)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
835 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Event

Latitude

Longitude

Date/Time

Elevation [m]

Station

Expedition

Depth sed [m]

M [u]
(Abundance LMW (Da AU))
10 
M [u]
(Abundance MMW (Da AU))
11 
M [u]
(Abundance HMW (Da AU))
12 
M [u]
(AMW (Da))
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2021_Feb_opt_AKU2755.000016.00002021-02-15T10:02:00-76AKU272021_Feb_opt0.07152630.4331003979377.9020011580257.2300001178.44490
2021_Feb_opt_AKU2755.000016.00002021-02-15T10:02:00-76AKU272021_Feb_opt0.092418679.1710007243699.523009123946.6040001195.97780
2021_Feb_opt_P5 55.240016.05002021-02-15T16:02:00-84P5'2021_Feb_opt0.0046519.549680184770.88790878826.139300998.01462
2021_Feb_opt_P555.240016.05002021-02-15T16:02:00-84P5'2021_Feb_opt0.0143640.722160224942.351101087026.6190001028.86530
2021_Feb_opt_P555.240016.05002021-02-15T16:02:00-84P5'2021_Feb_opt0.0356560.309330635033.332701908346.4550001096.65170
2021_Feb_opt_P555.240016.05002021-02-15T16:02:00-84P5'2021_Feb_opt0.0561848.799510648177.389302009550.8550001125.19900
2021_Feb_opt_P555.240016.05002021-02-15T16:02:00-84P5'2021_Feb_opt0.0766253.987010816345.098903956525.2820001171.14650
2021_Feb_opt_P555.240016.05002021-02-15T16:02:00-84P5'2021_Feb_opt0.0967781.0379501334547.762003412446.7020001159.87160
2021_Apr_chem_IDEAL1 55.440015.30002021-04-14T06:04:00-86IDEAL12021_Apr_chem0.0041196.313310136451.38790954031.372500996.54629
2021_Apr_chem_IDEAL155.440015.30002021-04-14T06:04:00-86IDEAL12021_Apr_chem0.0182724.624950431201.293101365280.5300001063.20830
2021_Apr_chem_IDEAL155.440015.30002021-04-14T06:04:00-86IDEAL12021_Apr_chem0.0356436.340210908493.974402201401.1270001143.16170
2021_Apr_chem_IDEAL155.440015.30002021-04-14T06:04:00-86IDEAL12021_Apr_chem0.0566360.0626401038471.217002497331.7990001139.33130
2021_Apr_chem_IDEAL155.440015.30002021-04-14T06:04:00-86IDEAL12021_Apr_chem0.0769499.0659601043157.988002818449.5520001147.78670
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2021_Apr_chem_BO1 55.330015.57002021-04-14T16:04:00-93BO12021_Apr_chem0.0050047.296300263477.11740787360.9039001019.62440
2021_Apr_chem_BO155.330015.57002021-04-14T16:04:00-93BO12021_Apr_chem0.0158419.6324801040900.711002477600.4300001158.94410
2021_Apr_chem_BO155.330015.57002021-04-14T16:04:00-93BO12021_Apr_chem0.031943420.990003440449.5070001191.31370
2021_Apr_chem_BO155.330015.57002021-04-14T16:04:00-93BO12021_Apr_chem0.0563473.747510476581.059905756966.6210001182.08810
2021_Apr_chem_BO155.330015.57002021-04-14T16:04:00-93BO12021_Apr_chem0.07107292.7412002581967.681006049208.3550001189.38650
2021_Apr_chem_BO155.330015.57002021-04-14T16:04:00-93BO12021_Apr_chem0.09134505.0970003522647.419008327284.6290001198.25280
2021_Apr_chem_P5old 55.250015.99002021-04-18T08:04:00-87P5old2021_Apr_chem0.0045550.772330187200.01000849407.335500999.10791
2021_Apr_chem_P5old55.250015.99002021-04-18T08:04:00-87P5old2021_Apr_chem0.0156292.454500615762.436901762741.6400001119.74150
2021_Apr_chem_P5old55.250015.99002021-04-18T08:04:00-87P5old2021_Apr_chem0.0352105.2809802002089.767001884124.8860001155.83300
2021_Apr_chem_P5old55.250015.99002021-04-18T08:04:00-87P5old2021_Apr_chem0.0568944.8028801116869.861002933089.0420001145.78060
2021_Apr_chem_P5old55.250015.99002021-04-18T08:04:00-87P5old2021_Apr_chem0.0769202.206130543036.568203810583.1350001141.61470
2021_Apr_chem_P5old55.250015.99002021-04-18T08:04:00-87P5old2021_Apr_chem0.0974477.7667301393965.411003421808.0610001153.18690
2021_Apr_chem_LO2 56.150019.22002021-04-19T20:04:00-123LO22021_Apr_chem0.0027962.21422092254.973741092778.8270001003.97240
2021_Apr_chem_LO256.150019.22002021-04-19T20:04:00-123LO22021_Apr_chem0.0157325.214050917211.770402136205.9660001129.97540
2021_Apr_chem_LO256.150019.22002021-04-19T20:04:00-123LO22021_Apr_chem0.0360435.7721201215816.308002712231.9040001150.30000
2021_Apr_chem_LO256.150019.22002021-04-19T20:04:00-123LO22021_Apr_chem0.0574284.1123801532588.968003602398.1370001125.44190
2021_Apr_chem_LO256.150019.22002021-04-19T20:04:00-123LO22021_Apr_chem0.0789396.9175102204105.559005056118.1920001152.31660
2021_Apr_chem_LO256.150019.22002021-04-19T20:04:00-123LO22021_Apr_chem0.09112919.9725002631857.964007436582.5350001154.78240
2021_Apr_chem_BY10 56.630019.58002021-04-20T06:04:00-140BY102021_Apr_chem0.0031746.111540751288.05100489868.2969001004.02230
2021_Apr_chem_BY1056.630019.58002021-04-20T06:04:00-140BY102021_Apr_chem0.0154975.357800299236.88100947144.9872001006.77360
2021_Apr_chem_BY1056.630019.58002021-04-20T06:04:00-140BY102021_Apr_chem0.0340297.844360261494.763901084018.6920001020.78020
2021_Apr_chem_BY1056.630019.58002021-04-20T06:04:00-140BY102021_Apr_chem0.0552401.982360484779.687901424100.9400001070.57710
2021_Apr_chem_BY1056.630019.58002021-04-20T06:04:00-140BY102021_Apr_chem0.0748108.815840541691.603101373024.2420001078.76270
2021_Apr_chem_BY1056.630019.58002021-04-20T06:04:00-140BY102021_Apr_chem0.0957597.209690878135.350502083643.1250001128.98910
2021_Apr_chem_BY1056.630019.58002021-04-20T06:04:00-140BY102021_Apr_chem0.0957597.209690878135.350502083643.1250001128.98910