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opennotspecifiedOct 2018View details →

FIGURE 1 in A new Lamellibrachia species and confirmed range extension for Lamellibrachia barhami (Siboglinidae, Annelida) from Costa Rica methane seeps

FIGURE 1. Distribution of Lamellibrachia. Lamellibrachia anaximandri (white square), Lamellibrachia barhami (grey circle), Lamellibrachia columna (white hexagon), Lamellibrachia donwalshi sp. nov. (white star), Lamellibrachia juni (white triangle), Lamellibrachia luymesi (black star), Lamellibrachia sagami (grey triangle), Lamellibrachia satsuma (white circle), Lamellibrachia victori (grey diamond), unresolved Lamellibrachia species (black circles): L. sp. 1/cf. luymesi, L. sp. 2, L. sp. L4, L. sp. L5, L. sp. L6.

opennotspecifiedOct 2018View details →

FIGURE 4 in A new Lamellibrachia species and confirmed range extension for Lamellibrachia barhami (Siboglinidae, Annelida) from Costa Rica methane seeps

FIGURE 4. Haplotype networks from COI data of Lamellibrachia sp. 2 (grey), Lamellibrachia anaximandri (white), and Lamellibrachia donwalshi sp. nov. (black).

FIGURE 3 in New records of Swiftia (Cnidaria, Anthozoa, Octocorallia) from off the Pacific Costa Rican margin, including a new species from methane seeps

FIGURE 3. Swiftia sahlingi sp. nov., MZUCR 2725 (holotype). (A–C) coenenchymal sclerites; (D) tentacular rods (optic micrographs).

FIGURE 2 in New records of Swiftia (Cnidaria, Anthozoa, Octocorallia) from off the Pacific Costa Rican margin, including a new species from methane seeps

FIGURE 2. Swiftia sahlingi sp. nov. (A) MZUCR 2725, holotype; (B–D) colonies in situ, at the type locality, Mound 12.

FIGURE 5 in New records of Swiftia (Cnidaria, Anthozoa, Octocorallia) from off the Pacific Costa Rican margin, including a new species from methane seeps

FIGURE 5. Swiftia phylogenetic analysis. Maximum likelihood tree of the combined analysis of COI and MutS. Numbers above nodes are bootstrap support percentages (BS) from RAxML, followed by Bayesian posterior probabilities (PP). Nodes with no numbers indicate support was less that 50% BS and 0.7 PP. A dash '-' indicates the node was not found in the Bayesian analysis.

FIGURE 1 in New records of Swiftia (Cnidaria, Anthozoa, Octocorallia) from off the Pacific Costa Rican margin, including a new species from methane seeps

FIGURE 1. Swiftia sahlingi sp. nov. MZUCR 2725, holotype; (A) entire colony; (B) detail of branches and polyp mounds; (C) MZUCR 2729, paratype, polyp detail; (D) Swiftia comauensis, polyp detail (photograph: Verene Häussermann).

FIGURE 4 in New records of Swiftia (Cnidaria, Anthozoa, Octocorallia) from off the Pacific Costa Rican margin, including a new species from methane seeps

FIGURE 4. Swiftia sahlingi sp. nov., MZUCR 2725 (holotype) SEM micrographs. (A) spindles; (B) spindles and radiates; (C) plates; (D) points sclerites; (E) warty clubs; (F) polyp rods.

opencc-by-4.0Aug 2024View details →

Datafiles supporting the article: Impact of methane and other precursor emission reductions on surface ozone in Europe: Scenario analysis using the EMEP MSC-W model

This repository contains the input and output files of the EMEP model related to the article "Impact of methane and other precursor emission reductions on surface ozone in Europe: Scenario analysis using the EMEP MSC-W model" submitted to ACP. The folder Python_scripts includes the .py files used to generate the MAGICC7 model input files and simulation results, as well as the files used to create the figures in both the manuscript and supplementary information. For users, the paths in these scripts will have to be adjusted to point to the data files included in the EMEP_output folder. The latter folder contains the 5-year average scenario simulations as discussed in the main body of the text, as well as the ozone sensitivity to methane concentrations. The EMEP_input folder contains the IIASA scenario emission files for the baseline, 2050 CLE, 2050 MFR, and 2050 LOW scenarios, including separate international shipping files. The regional 0.1 by 0.1 degree emission files are a combination of IIASA files for EECCA countries and EMEP reported emissions scaled by the included 'femis' files. The EMEP model code and reported emissions are available from the open-source release, available here: https://zenodo.org/record/8431553.

opencc-by-4.0Sep 2024View details →

Figures in "Gulf Stream mesoscale variabilities drive bottom marine heatwaves in Northwest Atlantic continental margin methane seeps"

Data and code for figures in "Gulf Stream mesoscale variabilities drive bottom marine heatwaves in Northwest Atlantic continental margin methane seeps".

opencc-by-4.0May 2024View details →

Sediment geochemistry, archaeal abundance and GDGT data from methane seep sediments offshore Southwest Taiwan

Dataset for manuscript "Methane Index and TEX86 values in cold seep sediments: implications for paleo-environmental reconstructions" currently under review in Geochimica et Cosmochimica Acta. Parameters include methane gas concentration, sulfate concentration, total organic carbon, dissolved inorganic carbon, stable carbon isotopes of total organic and dissolved inorganic carbon, the abundances of archaea and ANME-1, glycerol dialkyl glycerol tetraethers (GDGTs) and their associated indices including the Methane Index, Branched Isoprenoid Index, Ring Index and TEX86. ANME1_gdgt_calculation datasheet shows the calculations based on which the ANME-1 GDGT relative distribution was inferred. Datasheets Flux Dive1, Flux Dive3 and Flux MD10-3280 contain the calculations of sulfate and dissolved inorganic carbon fluxes.

opencc-by-4.0Nov 2024View details →

Clumped isotope measurements reveal aerobic oxidation of methane below the Greenland ice sheet

Archive Data Author(s) Getachew Agmuas Adnew, Thomas Ro¨ckmann, Thomas Blunier, Christian Juncher Jørgensen, Sarah Elise Sapper, Carina van der Veen, Malavika Sivan, Maria Elena Popa, Jesper Riis Christiansen Title Clumped isotope measurements reveal aerobic oxidation of methane below the Greenland ice sheet Description Data collection related to the manuscript/paper " Clumped isotope measurements reveal aerobic oxidation of methane below the Greenland ice sheet".   The data are the basis for figure 4, 5, 6,7 and 9, table 1 and supplementary figure 2 in manuscript/paper. The data is provided as an excel file as described below. Sheet 1: Mass scan for clumped methane measurement cup configuration. This data set is used to produce figure 4. Sheet 2:   contains all data for the concentration and isotope composition of methane  (bulk and clumped isotope) and the 𝛅13C of carbon dioixed . These data is provided in Table 1 and used to produce Figure 5  to 7 and supplemetary figure 2 Sheet 3: Water isotope data of the subglacial melt water Sheet 4: Data for end pont members used to produce Figure 9   2.1 Site description The study site is located at an elevation of 450 m above sea level at a lateral subglacial meltwater outlet on the southern flank at the terminus of the Isunnguata Sermia Glacier at the western margin of the GrIS (67°09’16.40’’N 50°04’08.48’’W). The area in front of the meltwater outlet consists of abraded granodioritic gneiss bedrock with large boulders and patches of gravel, sand and silt deposited by meltwater. The glacier front contained highly irregular cracks and air-filled cavities, which changed over the season as the ice melted and deformed.   2.2. Collection of air samples Air samples were collected in june 2022 from the ice cave using a small compressor that compressed ambient air into pre-evacuated 6 and 15 L volume canisters to a final pressure of 3 bar (Entech Instruments,USA) (Figure 2 and 3). The mole fraction of CH4 and CO2 in the air sampled was monitored with a microportable Greenhouse Gas Analyzer (MGGA) (GLA131-GGA, ABB-Los Gatos Research, San Jose, CA, USA). Background air was collected at the top of the glacier in 2 L volume stainless steel canisters.   2.2. Collection of water samples We collected water samples from the subglacial meltwater at the margin of ISG for water isotope analysis in June 2022 between 12:00 and 15:00 (local time). The water samples were filtered using 0.45 µm pore size syringe filters and stored in an amber glass with a small headspace in a refrigerator prior to analysis.   2.7 Isotopic analyses of gas and water samples   The bulk isotope composition (δ13C(CH4) and δD(CH4)) and clumped isotopes (∆13CH3D and ∆12CH2D2) of CH4 were measured using a high-resolution gas source isotope ratio mass spectrometer (HR-IRMS) (Thermo Scientific, Germany) in dual inlet mode at Utrecht University. CH4 from air samples was extracted using cryogenic separation (see Figure 3). The extraction process employed two traps to remove CO2 and other condensable gases, followed by a charcoal trap to collect CH4, all operated at a temperature of liquid nitrogen (-196°C). Further purification of CH4 was achieved using a custom-made gas chromatography setup with two columns: a stainless steel column packed with molecular sieve to separate gases like H2, Ar, O2, and N2 and a second column packed with HayeSep-D porous polymer to separate CH4 from higher-order hydrocarbons such as C2H6 and C3H8.   The isotopic composition of CO2 (δ13C) was analyzed with the CF-IRMS system at Utrecht University. In short, the CO2 is cryogenically separated from the air, further purified chromatographically, and then injected into the IRMS via an open split inlet. The results are related to the VPDB and VSMOW scales via a reference air cylinder with known isotopic composition.   Water isotopes were measured at Physics of Ice and Climate (PIC), Niels Bohr Institute, University of Copenhagen, Denmark with a cavity ring-down spectroscopy (Picarro L2130, PICARRO, USA).

opencc-by-4.0Nov 2024View details →

Data for Methane Emission Metrics Assessment: Sum44

<h1>Synthetic Datasets</h1> Synthetic datasets created for "Assessing alternative methane emission metrics conducive to quantifying global warming and setting near-term climate goals". All datasets were uploaded as .ZIP files and data is in .TXT format. 1) Synthetic Dataset - contains 1000 methane emissions pathways and their AGTP-derived temperature outputs used in the main text. Data generated according to methods detailed in the article text.  2) Balanced Synthetic Dataset - contains 1000 methane emissions pathways and their AGTP-derived temperature outputs used in the Supplemental Materials Section 1.1. Pathways balanced for increases and decreases. 3) Idealized Pathways - contains the step and pulse methane emissions pathways and their AGTP-derived temperature outputs.

FIGURE 33 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURE 33. Thyasira falklandicum, South Orkney Island, Antarctica, 244–344m, NMW.Z. 2005.4.4, Gross anatomy after removal of right mantle.

FIGURES 1–4. Thyasira methanophila new species. Holotype. MNHNCL 201646 Live collected specimen. Figs 1 & 4 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 1–4. Thyasira methanophila new species. Holotype. MNHNCL 201646 Live collected specimen. Figs 1 & 4 external and internal of right valve; Figs 2 & 3 external and internal of left valve.

FIGURES 5–10. Thyasira methanophila new species. Paratypes. MNHNCL 201648 and NMW.Z. 2005.4.2. Figs 5–7 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 5–10. Thyasira methanophila new species. Paratypes. MNHNCL 201648 and NMW.Z. 2005.4.2. Figs 5–7 disarticulated valves showing variation in outline; Fig. 8 oblique view of part of escutcheon; Fig. 9 internal view with adductor muscle and pallial scars artificially highlighted. Fig. 10 right valve of specimen used for anatomical study.

FIGURES 16–22 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 16–22. Thyasira methanophila new species. Scanning electron micrographs of the ctenidium and filaments. Fig. 16 posterior portion of a demibranch, longitudinal oblique view; Fig. 17 frontal view of filaments on the exterior surface; Fig. 18 frontal view of filaments on interior surface; Fig. 19 oblique view of bacteriocyte zone of filaments with cut transverse section; Fig. 20 transverse section of one half of a filament showing open bacteriocytes; Fig. 21 polygonal surfaces of bacteriocytes; Fig. 22 ruptured bacteriocyte showing bacteria. Black arrows indicate features. white arrows indicate links between images.

FIGURES 23–26. Maorithyas marama Fleming, 1950 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 23–26. Maorithyas marama Fleming, 1950, Sylvan Cove Stewart Island, New Zealand, 7 m. NMNZ M026537. Figs 23 & 26 external and internal views of right valve; Figs 24 & 25 external and internal views of left valve. FIGURES 27–29. Dorsal views of left valves to show variation in escutcheon development. Fig. 27 T. methanophila; Fig. 28 T. (M.) marama; Fig. 29 T. falklandicum.

FIGURES 30–32 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 30–32 Maorithyas marama Bradshaw Sound, Fjordland, New Zealand, 90m. NMNZ M179679. Gross anatomy. Fig. 30 View after removal of right mantle; Fig. 31 View after removal of right ctenidium; Fig. 32 View after removal of right lateral body pouch and revealing alimentary system.

FIGURES 14–15. Thyasira methanophila new species. Gross anatomy. Fig. 14 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 14–15. Thyasira methanophila new species. Gross anatomy. Fig. 14 View after removal of right ctenidium. Fig. 15 View after removal of right lateral body pouch and exposing alimentary system.

FIGURES 11–13. Thyasira methanophila new species. Gross anatomy. Fig. 11 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 11–13. Thyasira methanophila new species. Gross anatomy. Fig. 11 View after removal of right mantle; Fig. 12 View of right mantle and adductor muscles showing pallial blood vessel; Fig. 13 oblique ventral view showing fleshy ctenidia and swollen lateral body pouches. Abbreviations as listed in appendix.