Supplementary material to "Seasonal and spatial variability of methane emissions from a subtropical reservoir in Eastern China"

Abstract. Subtropical reservoirs are important source of atmospheric methane (CH4). This study aims to investigate the spatiotemporal variability of CH4 emission, using the methods of static floating chambers and bubble traps, from the water surfaces of Xin'anjiang Reservoir. Seasonal variability showed that CH4 emission from the main reservoir body was high in autumn and low in spring, with medium values in summer and winter. The dynamics of CH4 emission was flat from February to June, but fluctuated dramatically from July to January in the upstream river, which was interrupted by the bubbles in the second half year. However, CH4 emission was largely influenced by the streamflow in the downstream river, with a minimum value in February due to an extreme low streamflow (275 m3 s−1). Spatial variability showed the upstream river had the highest CH4 flux (3.90 ± 7.80 mg CH4 m−2 h−1), followed by the downstream river (0.50 ± 0.41 mg CH4 m−2 h−1), and the main reservoir body stood the last place (0.01 ± 0.07 mg CH4 m−2 h−1). Therefore, it was necessary to capture the variation of CH4 emission from reservoirs in the space and time scales to avoid the error of estimating the CH4 emission incorrectly.

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Supplementary material to "Hot regions of labile and stable soil organic carbon in Germany – Spatial variability and driving factors"

10.5194/soil-2017-30-supplement ◽

2017 ◽

Author(s):

Cora Vos ◽

Angélica Jaconi ◽

Anna Jacobs ◽

Axel Don

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Spatial Variability ◽

Driving Factors ◽

Supplementary Material

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Supplementary material to "Effects of spatial variability on the exposure of fish to hypoxia: a modeling analysis for the Gulf of Mexico"

10.5194/bg-2020-51-supplement ◽

2020 ◽

Author(s):

Elizabeth D. LaBone ◽

Kenneth A. Rose ◽

Dubravko Justic ◽

Haosheng Huang ◽

Lixia Wang

Keyword(s):

Gulf Of Mexico ◽

Spatial Variability ◽

Modeling Analysis ◽

Supplementary Material

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An integrated organic–inorganic geochemical characterization of Paleogene sediments in No.1 Structural Belt of the Nanpu Sag, Bohai Bay Basin, eastern China: implications for the origin of organic matter

Geochemistry Exploration Environment Analysis ◽

10.1144/geochem2019-060 ◽

2020 ◽

Vol 21 (1) ◽

pp. geochem2019-060

Author(s):

Yu Guo ◽

Wenzhe Gang ◽

Gang Gao ◽

Shangru Yang ◽

Chong Jiang ◽

...

Keyword(s):

Organic Matter ◽

Higher Plants ◽

Eastern China ◽

Source Rocks ◽

Bohai Bay ◽

Type Ii ◽

Lacustrine Environment ◽

Anoxic Conditions ◽

Supplementary Material ◽

Nanpu Sag

Paleogene sediments, especially the third member of the Dongying Formation (Ed3) and the first and third members of the Shahejie Formation (Es1 and Es3), have been regarded as the most important source rocks in the Nanpu Sag. Organic and inorganic analyses, including Rock-Eval pyrolysis, gas chromatography-mass spectrometry, and element geochemistry, in 91 mudstone samples, were used to reconstruct the palaeoenvironmental conditions, such as palaeoclimate, palaeo-salinity and palaeo-redox conditions, and to recognize the origin of organic matter. The results show that Es3 has a higher TOC content than Es1 and Ed3. Hydrocarbon genetic potential (S1 + S2) of the samples indicate fair to good hydrocarbon potential. The kerogen type of Ed3 and Es1 source rocks are Type II1–II2, while Es3 source rocks are dominated by Type II2–III kerogens. Biomarkers and inorganic geochemical indicatives of source rocks, such as Pr/Ph, V/(V + Ni) and Cu/Zn, indicate a lacustrine environment with fresh to brackish water under suboxic to anoxic conditions during deposition. Ed3 source rocks are characterized by low G/C30H (gamacerane/C30hopane) (<0.1), TT/C30H (tricyclic terpane/C30hopane) and S/H (serane/hopane), high Pr/Ph (pristane/phytane) and C24TeT/C23TT (C24tetracyclic terpane/C23tricyclic terpane), indicating mixed input of both algae and terrestrial higher plants, dominated by terrestrial higher plants. Es1 source rocks display medium G/C30H, TT/C30H, S/H, Pr/Ph and C24TeT/C23TT, indicative of a mixed input of both algae and terrestrial higher plants. Es3 source rocks are characterized by high G/C30H (>0.1), TT/C30H and S/H, low Pr/Ph and C24TeT/C23TT, typical of a mixed input of algae and terrestrial higher plants, with algal dominance. Ed3, Es1 and Es3 source rocks were mostly deposited in semi-arid to humid-warm climate conditions, with an average temperature higher than 15°C. This study suggests that suitable temperatures, a fresh to brackish lacustrine environment and suboxic to anoxic conditions could result in a high organic matter concentration and preservation, thus providing prerequisites for the formation of high-quality source rocks.Supplementary material: Tables S1–S3 are available at https://doi.org/10.6084/m9.figshare.c.5227684

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