Li, Xiao-Jun; Zhuang, Guangchao; Zhang, Hong-Hai: Methane and Dimethylsulfoniopropionate (DMSP) concentration in the South China Sea [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.969263 (dataset in review)
Abstract:
The South China Sea (SCS) frequently encounters mesoscale eddies due to the influence of the Kuroshio intrusion and monsoonal patterns. However, the impact of these eddies on methane (CH⁴) biogeochemical cycling in the SCS remains poorly understood. Dissolved methane and dimethylsulfoniopropionate (DMSP) samples were collected from the eddy pair (cyclonic-anticyclonic eddy pair) at stations ME1−ME7, located near the western side of Hainan Island, on September 27, 2020. Additionally, methane concentration and oxidation rates were assessed within anticyclonic eddy stations between September 13 and 23, 2022. The distribution of SLA were obtained from the Copernicus Marine Environment Monitoring Service at 0.25° resolution. Seawater samples collected by 12 L Niskin bottles equipped with SBE 911 plus a conductivity-temperature-depth (CTD) probe. The CH⁴ sample was collected in 120 ml brown bottles and then 50 μl saturated HgCl₂ was added to inhibit biological activity. Samples were sealed with aluminum caps containing Teflon septa and temporarily stored in the dark at 4°C. Dissolved methane was measured using a cryogenic purge-and-trap setup connected to an gas chromatograph (GC-8890, Agilent, USA) with a flame ionization detector (FID) according to the detailed methods given in (Zhang et al. (2004, doi:10.1029/2004JC002268). For total dimethylsulfoniopropionate (DMSPt), 5 ml seawater were preserved with the addition of 5 μl of 50% sulfuric acid to oxidize dimethylsulfide (DMS) into nonvolatile compounds and inhibit biological activity. Seawater samples intended for dissolved DMSP (DMSPd) determination were pre-filtered by gravity using a 0.45 μm filter. Particulate DMSP (DMSPp) was derived by subtracting DMSPd from DMSPt. All DMSP samples were stored in darkness at 4℃ until analysis. Briefly, a 2 ml sample was mixed with 200 μl of 10 mol/potassium hydroxide (KOH) and incubated at room temperature for 6 h to ensure complete conversion of DMSP into DMS. Seawater DMS samples were analyzed immediately after collection using a modified purge-and-trap method on a gas chromatograph (GC-2014, Shimadzu, Japan) equipped with a flame photometric detector (FPD) (Yang et al., 2012, doi:10.1016/j.marchem.2012.05.003).
Supplement to:
Li, Xiao-Jun; Li, Shuang; Zhou, Chun; Zhang, Hong-Hai; Zhuang, Guang-Chao (submitted): Effect of the mesoscale eddy on the methane cycling in the South China Sea.
References:
Bussmann, Ingeborg; Hackbusch, Steffen; Schaal, Patrick; Wichels, Antje (2017): Methane distribution and oxidation around the Lena Delta in summer 2013. Biogeosciences, 14(21), 4985-5002, https://doi.org/10.5194/bg-14-4985-2017
Kiene, Ronald P; Slezak, Doris (2006): Low dissolved DMSP concentrations in seawater revealed by small‐volume gravity filtration and dialysis sampling. Limnology and Oceanography-Methods, 4(4), 80-95, https://doi.org/10.4319/lom.2006.4.80
Liu, Qiao; Du, Guanxiang; Li, Xiao‐Jun; Liu, Jiarui; Meng, Ni; Li, Chun‐Yang; Liu, Xiting; Zhang, Guiling; Yang, Gui‐Peng; Joye, Samantha B; Zhuang, Guang-Chao (2024): Dynamics and Controls of Methane Oxidation in the Aerobic Waters of Eastern China Marginal Seas. Journal of Geophysical Research: Oceans, 129(3), e2023JC020280, https://doi.org/10.1029/2023JC020280
Mao, Shi-Hai; Zhang, Hong-Hai; Zhuang, Guang-Chao; Li, Xiao-Jun; Liu, Qiao; Zhou, Zhen; Wang, Wei-Lei; Li, Chun-Yang; Lu, Ke-Yu; Liu, Xi-Ting; Montgomery, Andrew; Joye, Samantha B; Zhang, Yu-Zhong; Yang, Gui-Peng (2022): Aerobic oxidation of methane significantly reduces global diffusive methane emissions from shallow marine waters. Nature Communications, 13, 7309, https://doi.org/10.1038/s41467-022-35082-y
Reeburgh, William S (2007): Oceanic Methane Biogeochemistry. Chemical Reviews, 107(2), 486-513, https://doi.org/10.1021/cr050362v
Funding:
Coverage:
Median Latitude: 18.628571 * Median Longitude: 112.499286 * South-bound Latitude: 18.500000 * West-bound Longitude: 111.697000 * North-bound Latitude: 18.800000 * East-bound Longitude: 113.301000
Date/Time Start: 2020-09-27T02:26:00 * Date/Time End: 2020-09-27T19:26:00
Minimum DEPTH, water: 2.9 m * Maximum DEPTH, water: 204.8 m
Event(s):
SCS_ME1 * Latitude: 18.500000 * Longitude: 111.697000 * Date/Time: 2020-09-27T02:26:00 * Elevation: -800.0 m * Location: South China Sea * Method/Device: Eddy Covariance Station (ECS)
SCS_ME2 * Latitude: 18.500000 * Longitude: 111.966000 * Date/Time: 2020-09-27T05:05:00 * Elevation: -800.0 m * Location: South China Sea * Method/Device: Eddy Covariance Station (ECS)
SCS_ME3 * Latitude: 18.600000 * Longitude: 112.233000 * Date/Time: 2020-09-27T08:08:00 * Elevation: -403.0 m * Location: South China Sea * Method/Device: Eddy Covariance Station (ECS)
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Event label | Event | Li, Xiao-Jun | |||
2 | Latitude of event | Latitude | Li, Xiao-Jun | |||
3 | Longitude of event | Longitude | Li, Xiao-Jun | |||
4 | Date/Time of event | Date/Time | Li, Xiao-Jun | |||
5 | Elevation of event | Elevation | m | Li, Xiao-Jun | ||
6 | Station label | Station | Li, Xiao-Jun | |||
7 | DEPTH, water | Depth water | m | Li, Xiao-Jun | CTD, Sea-Bird, SBE 911 | Geocode |
8 | Temperature, water | Temp | °C | Li, Xiao-Jun | CTD, Sea-Bird, SBE 911 | |
9 | Salinity | Sal | Li, Xiao-Jun | CTD, Sea-Bird, SBE 911 | ||
10 | Methane | CH4 | nmol/l | Li, Xiao-Jun | According to Zhang et al. (2004) | |
11 | Dimethylsulfoniopropionate, dissolved, flux per day | DMSP diss flux | nmol/l/day | Li, Xiao-Jun | According to Yang et al. (2012) | |
12 | Dimethylsulfoniopropionate, particulate, flux per day | DMSP part flux | nmol/l/day | Li, Xiao-Jun | According to Yang et al. (2012) | |
13 | Dimethylsulfoniopropionate, total, flux per day | DMSP tot flux | nmol/l/day | Li, Xiao-Jun | According to Yang et al. (2012) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
347 data points