Filters: Tags: accretion rate (X) > partyWithName: U.S. Geological Survey (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 Woods Hole Coastal and Marine Science Center Meagan Eagle U.S. Geological Survey - ScienceBase Natural Hazards Kevin D Kroeger More... Categories Data (7) Tag Types Theme (7) Place (7) USGS Scientific Topic Keyword (7) Tag Schemes Geographic Names Information System (GNIS) (7) USGS Thesaurus (7) None (7) ISO 19115 Topic Category (7) National Agricultural Library Thesaurus (6) View Results as: JSON ATOM CSV

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 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 Collection, Analysis, and Age-Dating of Sediment Cores from Salt Marshes, Rhode Island, 2016 The accretion history of fringing salt marshes in Narragansett Bay, Rhode Island, was reconstructed from sediment cores. Age models, based on excess lead-210 and cesium-137 radionuclide analysis, were constructed to evaluate how vertical accretion and carbon burial rates have changed during the past century. The Constant Rate of Supply (CRS) age model was used to date six cores collected from three salt marshes. Both vertical accretion rates and carbon burial increased from 1900 to 2016, the year the data were collected. Cores were up to 90 cm in length with dry bulk density ranging from 0.07 to 3.08 grams per cubic centimeter and carbon content 0.71 % to 33.58 %. Categories: Data; Tags: 137-cesium, 210-lead, Almy Brook (1218186), Constant Rate of Supply (CRS) model, Geochemistry, All tags... Mary C Donovan Marsh (1901736), Mary's Creek (2090042), Narragansett Bay (1218465), Prudence Island (1218169), Rhode Island, United States of America, accretion rate, age model, carbon burial, ecological restoration, environment, geoscientificInformation, inlandWaters, location, piston coring, radiometric dating, salt marsh, salt marshes, sea-level change, sedimentation, soil chemistry, wetland ecosystems, wetland soils, wetlands, Fewer tags