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Filter Total Items: 919
The 4.2 ka event, ENSO, and coral reef development
Variability of sea-surface temperature related to shifts in the mode of the El Niño–Southern Oscillation (ENSO) has been implicated as a possible forcing mechanism for the global-scale changes in tropical and subtropical precipitation known as the 4.2 ka event. We review records of coral reef development and paleoceanography from the tropical eastern Pacific (TEP) to evaluate the potential impact
Authors
Lauren Toth, Richard B. Aronson
Reconstructing precipitation in the tropical South Pacific from dinosterol 2H/1H ratios in lake sediment
The South Pacific Convergence Zone (SPCZ) is the Southern Hemisphere’s largest precipitation feature supplying freshwater to 11 million people. Despite its significance, little is known about the location and intensity of SPCZ precipitation prior to instrumental records, hindering attempts to predict precipitation changes in a warming world. Here we use sedimentary molecular fossils to establish a
Authors
Ashley E. Maloney, Daniel B. Nelson, Julie N. Richey, Matthew Prebble, David A. Sear, Jonathan D. Hassall, Peter G. Langdon, Ian W. Croudace, Atun Zawadzki, Julian P. Sachs
Distribution of modern salt-marsh Foraminifera from the eastern Mississippi Sound, U.S.A.
This study documented surface distributions of live and dead foraminiferal assemblages in the low-gradient tidal marshes of the barrier island and estuarine complex of the eastern Mississippi Sound (Grand Bay, Pascagoula River, Fowl River, Dauphin Island). A total of 71,833 specimens representing 38 species were identified from a gradient of different elevation zones across the study area. We iden
Authors
Christian Haller, Christopher G. Smith, Pamela Hallock, Albert C. Hine, Lisa Osterman, Terrence McCloskey
Short-term effects of ambient air pollution and cardiovascular events in Shiraz, Iran, 2009 to 2015
Air pollution and dust storms are associated with increased cardiovascular hospital admissions. The aim of this study was to investigate the association between short-term exposure to ambient air pollutants and CVD (cardiovascular disease) events in a long-term observational period. The study included the events of cardiovascular diseases (namely coronary artery disease, ischemic heart disease, my
Authors
Zahra Soleimani, Ali Darvishi Boloorani, Reza Khalifeh, Dale W. Griffin, Alireza Mesdaghinia
Recent outer-shelf foraminiferal assemblages on the Carnarvon Ramp and Northwestern Shelf of Western Australia
The carbonate sediments of the Western Australian shelf in the Indian Ocean host diverse assemblages of benthic foraminifera. Environments of the shelf are dominated by the southward-flowing Leeuwin Current, which impacts near-surface circulation and influences biogeographic ranges of Indo-Pacific warm-water foraminifera. Analyses of outer ramp to upper slope sediments (127–264 m water depth) at f
Authors
Christian Haller, Pamela Hallock, Albert C. Hine, Christopher G. Smith
Louisiana Coastal Zone sediment characterization; comparison of sediment grain sizes for samples collected in 2008 and 2015–2016 from the western Chenier plain to the Chandeleur Islands, Louisiana—Louisiana Barrier Island Comprehensive Monitoring (BICM) P
Repeated sampling and grain-size analysis of surficial sediments along the sandy shorelines of Louisiana is necessary to characterize coastal-zone sediment properties and evaluate sediment transport patterns within the nearshore environments. In 2008, and again in 2015 and 2016, sediment grab samples were collected along the shorelines of the western Chenier plain, the Isles Dernieres (Raccoon, Wh
Authors
Stephen T. Bosse, James G. Flocks, Julie Bernier, Ioannis Y. Georgiou, Mark A. Kulp, Michael Brown
Sediment data from vibracores collected in 2016 from Fire Island, New York
Researchers from the U.S. Geological Survey (USGS) conducted a long-term coastal morphologic-change study at Fire Island, New York, prior to and after Hurricane Sandy impacted the area in October 2012. The Fire Island Coastal Change project objectives include understanding the morphologic evolution of the barrier island system on a variety of time scales (months to centuries) and resolving storm-r
Authors
Noreen A. Buster, Julie Bernier, Owen T. Brenner, Kyle W. Kelso, Thomas M. Tuten, Jennifer L. Miselis
Analysis of multi-decadal wetland changes, and cumulative impact of multiple storms 1984 to 2017
Land-cover classification analysis using Landsat satellite imagery acquired between 1984 and 2017 quantified short- (post-Hurricane Sandy) and long-term wetland-change trends along the Maryland and Virginia coasts between Metompkin Bay, VA and Ocean City, MD. Although there are limited options for upland migration of wetlands in the study area, regression analysis showed that wetland area increase
Authors
Steven H. Douglas, Julie Bernier, Kathryn Smith
Quantifying uncertainty in Sr/Ca-based estimates of SST from the coral Orbicella faveolata
The strontium to calcium ratio (Sr/Ca) in aragonitic skeletons of massive corals provides a proxy for sea surface temperature (SST) that can be used to reconstruct paleoclimates across decades, centuries, and, potentially, millennia. Determining the reproducibility of Sr/Ca records among contemporaneous coral colonies from the same region is critical to quantifying uncertainties associated with th
Authors
Jennifer A. Flannery, Julie N. Richey, Lauren Toth, Ilsa B. Kuffner, Richard Z. Poore
Assessing the impact of open-ocean and back-barrier shoreline change on Dauphin Island, Alabama, at multiple time scales over the last 75 years
Dauphin Island and Little Dauphin Island, collectively, make up a geomorphically complex barrier island system located along Alabama’s southern coast, separating Mississippi Sound from the Gulf of Mexico and Mobile Bay. The barrier island system provides numerous economical (tourism, fisheries) and natural (habitat for migratory birds, natural protection of inland and coastal areas from storms) be
Authors
Christopher G. Smith, Joseph W. Long, Rachel E. Henderson, Paul R. Nelson
Sediment transport model including short-lived radioisotopes: Model description and idealized test cases
Geochronologies derived from sediment cores in coastal locations are often used to infer event bed characteristics such as deposit thicknesses and accumulation rates. Such studies commonly use naturally occurring, short-lived radioisotopes, such as Beryllium-7 (7Be) and Thorium-234 (234Th), to study depositional and post-depositional processes. These radioisotope activities, however, are not gener
Authors
Justin J. Birchler, Courtney K. Harris, Christopher R. Sherwood, Tara A Kniskern
Reconnaissance of mixed organic and inorganic chemicals in private and public supply tapwaters at selected residential and workplace sites in the United States
Safe drinking water at the point-of-use (tapwater, TW) is a United States public health priority. Multiple lines of evidence were used to evaluate potential human health concerns of 482 organics and 19 inorganics in TW from 13 (7 public supply, 6 private well self-supply) home and 12 (public supply) workplace locations in 11 states. Only uranium (61.9 μg L–1, private well) exceeded a National Prim
Authors
Paul M. Bradley, Dana W. Kolpin, Kristin M. Romanok, Kelly L. Smalling, Michael J. Focazio, Juliane B. Brown, Mary C. Cardon, Kurt D. Carpenter, Steven R. Corsi, Laura A. DeCicco, Julie E. Dietze, Nicola Evans, Edward T. Furlong, Carrie E. Givens, James L. Gray, Dale W. Griffin, Christopher P. Higgins, Michelle L. Hladik, Luke R. Iwanowicz, Celeste A. Journey, Kathryn Kuivila, Jason R. Masoner, Carrie A. McDonough, Michael T. Meyer, James L. Orlando, Mark J. Strynar, Christopher P. Weis, Vickie S. Wilson
By
Ecosystems Mission Area, Water Resources Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, California Water Science Center, Central Midwest Water Science Center, Colorado Water Science Center, Eastern Ecological Science Center, Kansas Water Science Center, New Jersey Water Science Center, Oregon Water Science Center, South Atlantic Water Science Center (SAWSC), St. Petersburg Coastal and Marine Science Center, Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center, National Water Quality Laboratory