Filters: Tags: carbon isotope analysis (X) > partyWithName: Woods Hole Coastal and Marine Science Center (X)

Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Types Map Service (2) OGC WFS Layer (2) OGC WMS Layer (2) OGC WMS Service (2) Contacts Natural Hazards U.S. Geological Survey U.S. Geological Survey - ScienceBase Meagan Eagle John Pohlman More... Categories Data (10) Tag Types Theme (10) Place (10) USGS Scientific Topic Keyword (9) Tag Schemes None (10) USGS Thesaurus (10) Geographic Names Information System (GNIS) (6) ISO 19115 Topic Category (10) National Agricultural Library Thesaurus (5) Marine Realms Information Bank (MRIB) keywords (2) Coastal and Marine Ecological Classification Standard (1) More... View Results as: JSON ATOM CSV

Vertical chemical profiles collected across haloclines in the water column of the Ox Bel Ha cave network within the coastal aquifer of the Yucatan Peninsula in January 2015 and January 2016 Natural cave passages penetrating a coastal aquifer in the Yucatan Peninsula (Mexico) were accessed to test the hypothesis that chemoclines associated with salinity gradients (haloclines) within the flooded cave networks of the karst subterranean estuary are sites of methane oxidation. Two field trips were carried out to the fully-submerged cave system located 6.6 km inland from the coastline in January 2015 and January 2016. Vertical chemical profiles across the water column haloclines were obtained using the OctoPiPi (OPP), a high-resolution water sampler built by the U.S. Geological Survey (USGS). The sampling efforts resulted in cm-scale profiles of major ions (e.g., chloride and sulfate), as well as concentrations... Categories: Data; Tags: Cenote Bang, Ecology, Geochemistry, Hydrology, Mexico, All tags... Ox Bel Ha Cave System, Quintana Roo, U.S. Geological Survey, USGS, Yucatan Peninsula, anchialine ecosystem, aquatic ecosystem, biogeochemical cycling, biogeochemical cycling, carbon cycling, carbon isotope analysis, cave, cenote, chemical records, coastal aquifer, coastal ecosystems, ecosystem function, environment, environment, estuarine ecosystems, estuarine mixing, field inventory and monitoring, freshwater ecosystems, geochemical data, geochemistry, groundwater, hydrogeology, hydrologic records, hydrology, inland waters, inlandWaters, karst, salinity, subterranean estuary, Fewer tags Collection, analysis, and age-dating of sediment cores from salt marshes on the south shore of Cape Cod, Massachusetts, from 2013 through 2014 The accretion history of fringing salt marshes located on the south shore of Cape Cod is reconstructed from sediment cores collected in low and high marsh vegetation zones. These marshes are micro-tidal, with a mean tidal range of 0.442 m. Their location within protected embayments and the absence of large rivers results in minimal sediment supply and a dominance of organic matter contributions to sediment peat. Age models based on 210-lead and 137-cesium are constructed to evaluate how vertical accretion and carbon burial rates have changed over the past century. The continuous rate of supply age model was used to age date 11 cores (10 low marsh and 1 high marsh) across four salt marshes. Both vertical accretion... Categories: Data; Tags: 137-cesium, 210-lead, Barnstable County, Cape Cod, Commonwealth of Massachusetts, All tags... Eel Pond, Environmental Health, Falmouth, Geochemistry, Great Pond, Hamblin Pond, Sage Lot Pond, Soil Sciences, United States of America, Waquoit Bay, Water Quality, Water Resources, accretion rate, carbon, carbon burial, carbon isotope analysis, elevation, geoscientificInformation, high marsh, location, low marsh, nitrogen, oceans, piston coring, radiometric dating, salt marsh elevation, sea-level change, sedimentation, soil chemistry, Fewer tags Static chamber gas fluxes and carbon and nitrogen isotope content of age-dated sediment cores from a Phragmites wetland in Sage Lot Pond, Massachusetts, 2013-2015 Coastal wetlands are major global carbon sinks, however, they are heterogeneous and dynamic ecosystems. To characterize spatial and temporal variability in a New England salt marsh, static chamber measurements of greenhouse gas (GHG) fluxes were compared among major plant-defined zones (high marsh dominated by Distichlis spicata and a zone of invasive Phragmites australis) during 2013 and 2014 growing seasons. Two sediment cores were collected in 2015 from the Phragmites zone to support previously reported core collections from the high marsh sites (Gonneea and others 2018). Collected cores were up to 70 cm in length with dry bulk density ranges from 0.04 to 0.33 grams per cubic centimeter and carbon content 22.4%... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: 137-cesium, 210-lead, Cape Cod (606914), Commonwealth of Massachusetts (606926), Constant Rate of Supply (CRS) model, All tags... Ecology, Masphee (615624), Sage Lot Pond (616458), United States of America, accretion rate, age model, biota, carbon, carbon burial, carbon isotope analysis, coastal processes, ecological processes, ecological restoration, elevation, environment, geoscientificInformation, inlandWaters, invasive species, location, nitrogen, oceans, piston coring, plot sampling, radiometric dating, salt marshes, sea-level change, sedimentation, soil chemistry, wetland ecosystems, wetland functions, wetland soils, wetlands, Fewer tags Collection, analysis, and age-dating of sediment cores from mangrove wetlands in San Juan Bay Estuary, Puerto Rico, 2016 The San Juan Bay Estuary, Puerto Rico, contains mangrove forests that store significant amounts of organic carbon in soils and biomass. There is a strong urbanization gradient across the estuary, from the highly urbanized and clogged Caño Martin Peña in the western part of the estuary, a series of lagoons in the center of the estuary, and a tropical forest reserve (Piñones) in the easternmost part with limited urbanization. We collected sediment cores to determine carbon burial rates and vertical sediment accretion from five sites in the San Juan Bay Estuary. Cores were radiometrically-dated using lead-210 and the Plum age model. Sites had soil C burial rates ranging from 50 grams per meter squared per year (g m-2... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: 137-cesium, 210-lead, Caño de Martín Peña (1613013), Commonwealth of Puerto Rico (1779808), Geochemistry, All tags... Laguna La Torrecilla (1611340), Laguna San José (1611343), Laguna de Pinoñes (1611336), Plum age model, San Juan (1612697), United States of America (1890467), accretion rate, age model, carbon, carbon burial, carbon isotope analysis, ecological restoration, environment, geoscientificInformation, health, mangrove sediments, nitrogen, oceans, radiometric dating, sea-level change, sedimentation, soil chemistry, utilitiesCommunication, wetland ecosystems, wetland soils, wetlands, Fewer tags Collection, analysis, and age-dating of sediment cores from Herring River wetlands and other nearby wetlands in Wellfleet, Massachusetts, 2015–17 The Herring River estuary in Wellfleet, Cape Cod, Massachusetts, has been tidally restricted for more than a century by a dike constructed near the mouth of the river. Upstream from the dike, the tidal restriction has caused the conversion of salt marsh wetlands to various other ecosystems including impounded freshwater marshes, flooded shrub land, drained forested upland, and brackish wetlands dominated by Phragmites australis. This estuary is now managed by the National Park Service, which plans to replace the aging dike and restore tidal flow to the estuary. To assist National Park Service land managers with restoration planning, the U.S. Geological Survey collected fourteen sediment cores from different ecosystems... Categories: Data; Tags: 137-cesium, 210-lead, Barnstable County (606927), Cape Cod (606914), Cape Cod National Seashore (606900), All tags... Commonwealth of Massachusetts (606926), Constant Rate of Supply (CRS) model, Duck Creek (616758), Geochemistry, Herring River (616776), Town of Wellfleet (618261), United States of America, Wellfleet Harbor (616838), accretion rate, age model, carbon, carbon burial, carbon isotope analysis, ecological restoration, elevation, environment, geoscientificInformation, inlandWaters, location, nitrogen, oceans, piston coring, radiometric dating, salt marshes, sea-level change, sedimentation, soil chemistry, wetland ecosystems, wetland soils, wetlands, Fewer tags Collection, analysis, and age-dating of sediment cores from natural and restored salt marshes on Cape Cod, Massachusetts, 2015-16 Nineteen sediment cores were collected from five salt marshes on the northern shore of Cape Cod where previously restricted tidal exchange was restored to part of the marshes. Cores were collected in duplicate from two locations within each marsh complex: one upstream and one downstream from the former tidal restriction (typically caused by an undersized culvert or a berm). The unaltered, natural downstream sites provide a comparison against the historically restricted upstream sites. The sampled cores represent a chronosequence of restoration occurring between 2001–10. Collected cores were up to 168 cm in length with dry bulk density ranging from 0.04 to 2.62 grams per cubic centimeter and carbon content 0.12 %... Categories: Data; Tags: Barnstable County (606927), Bass Creek (617465), Boat Meadow River (616844), Cape Cod (606914), Cape Cod Canal (619536), All tags... Commonwealth of Massachusetts (606926), Constant Rate of Supply (CRS) model, Dock Creek (616591), Geochemistry, Mill Creek (616621), Sagamore Beach (617797), Scusset Beach (616340), Town of Bourne (619412), Town of Eastham (619414), Town of Orleans (618257), Town of Sandwich (618259), United States of America, accretion rate, age model, carbon, carbon burial, carbon isotope analysis, cesium-137, ecological restoration, elevation, environment, geoscientificInformation, inlandWaters, lead-210, location, nitrogen, oceans, piston coring, radiometric dating, salt marsh, salt marshes, sea-level change, sedimentation, soil chemistry, wetland ecosystems, wetland soils, wetlands, Fewer tags Data and calculations to support the study of the sea-air flux of methane and carbon dioxide on the West Spitsbergen margin in June 2014 A critical question for assessing global greenhouse gas budgets is how much of the methane that escapes from seafloor cold seep sites to the overlying water column eventually crosses the sea-air interface and reaches the atmosphere. The issue is particularly important in Arctic Ocean waters since rapid warming there increases the likelihood that gas hydrate--an ice-like form of methane and water stable at particular pressure and temperature conditions within marine sediments--will break down and release its methane to the overlying ocean. Some researchers have even proposed the possibility of an Arctic methane catastrophe characterized by wholesale breakdown of gas hydrates in marine sediments and release of the... Categories: Data; Tags: Arctic Ocean, Norway, Prins Karls Forland, Spitsbergen, Svalbard, All tags... carbon cycling, carbon isotope analysis, environment, geoscientificInformation, greenhouse gas flux, marine chemistry, methane seep, ocean temperature, ocean-atmosphere interaction, oceanographic observations, oceans, sea-air gas flux, seep and vent ecosystems, seepage studies, Fewer tags Comparison of methane concentration and stable carbon isotope data for natural samples analyzed by discrete sample introduction module - cavity ring down spectroscopy (DSIM-CRDS) and traditional methods A discrete sample introduction module (DSIM) was developed and interfaced to a cavity ring-down spectrometer to enable measurements of methane and CO2 concentrations and 13C values with a commercially available cavity ring-down spectrometer (CRDS). The DSIM-CRDS system permits the analysis of limited volume (5 - 100-ml) samples ranging six orders-of-magnitude from 100% analyte to the lower limit of instrument detection (2 ppm). We demonstrate system performance for methane by comparing concentrations and 13C results obtained by the DSIM and traditional methods for a variety of sample types, including low concentration (nanomolar) seawater and high concentration (> 90%) natural gas. The expansive concentration range... Categories: Data; Tags: Geochemistry, Temperate Northern Atlantic, Temperate Northern Pacific, U.S. Geological Survey, USGS, All tags... biogeochemistry, carbon cycle, carbon cycling, carbon dioxide, carbon isotope analysis, cavity ring-down spectroscopy, eastern continental margin of India, environment, gas hydrate resources, geochemical data, geochemistry, geochemistry, isotope geochemistry, marine chemistry, methane, methane hydrate, northern Cascadia margin, northern US Atlantic margin, ocean characteristics, oceanography, oceans, sediment geochemistry, stable isotopes, Fewer tags Temporal hydrologic and chemical records from the Ox Bel Ha cave network within the coastal aquifer of the Yucatan Peninsula, from January 2015 to January 2016 Natural cave passages penetrating a coastal aquifer in the Yucatan Peninsula (Mexico) were accessed to investigate how regional meteorology and hydrology control methane dynamics in karst subterranean estuaries. Three field trips were carried out in January 2015, June 2015, and January 2016 to obtain year-long high-resolution temporal records of water chemistry and environmental parameters below and above the surface at a site (Cenote Bang) within the Ox Bel Ha cave network. These efforts resulted in chemical records of dissolved methane concentrations and its stable carbon isotopic content and major ion concentrations (i.e., chloride and sulfate) in approximately 2.5-day resolution from January 2015 to January... Categories: Data; Tags: Aquatic Biology, Cenote Bang, Ecology, Geochemistry, Hydrogeology, All tags... Mexico, Ox Bel Ha Cave System, Quintana Roo, U.S. Geological Survey, USGS, Water Resources, Yucatan Peninsula, anchialine ecosystem, aquatic ecosystem, biogeochemical cycling, biogeochemical cycling, carbon cycling, carbon isotope analysis, cave, cenote, chemical records, coastal aquifer, coastal ecosystems, ecosystem function, environment, environment, estuarine ecosystems, estuarine mixing, freshwater ecosystems, geochemical data, geochemistry, groundwater, groundwater flow, hydrogeology, hydrologic records, hydrology, inland waters, inland waters, karst, precipitation, salinity, subterranean estuary, temporal records, Fewer tags Collection, analysis, and age-dating of sediment cores from mangrove and salt marsh ecosystems in Tampa Bay, Florida, 2015 Coastal wetlands in Tampa Bay, Florida, are important ecosystems that deliver a variety of ecosystem services. Key to ecosystem functioning is wetland response to sea-level rise through accumulation of mineral and organic sediment. The organic sediment within coastal wetlands is composed of carbon sequestered over the time scale of the wetland’s existence. This study was conducted to provide information on soil accretion and carbon storage rates across a variety of coastal ecosystems that was utilized in the Tampa Bay Blue Carbon Assessment (ESA, 2017; linkage below). Ten sediment cores were collected from six Tampa Bay wetland sites in October 2015 (maximum core length 40 centimeters). Three main vegetation types... Categories: Data; Tags: 137-cesium, 210-lead, City of Saint Petersburg (2405401), City of Tampa (2405568), Double Branch Bay (281701), All tags... Fort de Soto Park (282682), Geochemistry, Hillsborough County (295757), Hunter Pass (284405), Manatee County (295744), Old Tampa Bay (294109), Pelican Cove (288669), Pinellas County (295745), Rocky Creek (289882), Ruskin (290065), State of Florida (294478), Tampa Bay (294169), Terra Ceia Bay (292128), United States of America, Weedon Island (292981), accretion rate, age model, carbon, carbon burial, carbon isotope analysis, ecological restoration, elevation, environment, geoscientificInformation, inlandWaters, location, mangrove sediments, mangroves, nitrogen, oceans, radiometric dating, salt marshes, sea-level change, sedimentation, soil chemistry, wetland ecosystems, wetland soils, wetlands, Fewer tags