Filters: Tags: {"type":"USGS Scientific Topic Keyword"} (X) > partyWithName: Jennifer A O'Keefe Suttles (X) > partyWithName: Adrian G Mann (X)

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Carbon dioxide and methane fluxes with supporting environmental data from coastal wetlands across Cape Cod, Massachusetts Saline tidal wetlands are important sites of carbon sequestration and produce negligible methane (CH4) emissions due to regular inundation with sulfate-rich seawater. Yet, widespread management of coastal hydrology has restricted vast areas of coastal wetlands to tidal exchange. These ecosystems often undergo impoundment and freshening, which in turn cause vegetation shifts like invasion by Phragmites, that affect ecosystem carbon balance. Understanding controls of carbon exchange in these understudied ecosystems is critical for informing climate consequences of blue carbon restoration and/or management interventions. Here we present measurements of net ecosystem exchange of carbon dioxide (CO2) and methane, along... Categories: Data Release - Revised; Tags: Geochemistry, carbon, ecological processes, ecology, invasive species, All tags... wetland ecosystems, wetland functions, 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 Water column properties and temporal hydrologic and chemical records from flooded caves (Ox Bel Ha and Cenote Crustacea) within the coastal aquifer of the Yucatan Peninsula, Quintana Roo, from December 2013 to January 2015 Natural cave passages penetrating coastal aquifers in the Yucatan Peninsula (Quintana Roo, Mexico) were accessed to investigate how regional meteorology and hydrology control dissolved organic carbon and methane dynamics in karst subterranean estuaries, the region of aquifers where fresh and saline waters mix. Three field trips were carried out in December 2013, August 2014, and January 2015 to obtain 1) physicochemical and 2) geochemical data from the water column and 3) temporal records of water chemistry and hydrological parameters below and above the surface at three sites within the Ox Bel Ha cave (Cenote Jailhouse, Cenote Naach Wennen Ha, and Cenote Odyssey) and another cave (Cenote Crustacea). These efforts... Tags: Water Quality, geochemistry, groundwater, karst, limnology, All tags... ocean sciences, 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