Publications
Filter Total Items: 855
A multiscale approach for monitoring groundwater discharge to headwater streams by the U.S. Geological Survey Next Generation Water Observing System Program—An example from the Neversink Reservoir watershed, New York
Groundwater-stream connectivity across mountain watersheds is critical for supporting streamflow during dry times and keeping streams cool during warm times, yet U.S. Geological Survey (USGS) stream measurements are often sparse in headwaters. Starting in 2019, the USGS Next Generation Water Observing System Program developed a multiscale methods and technology testbed approach to...
Authors
Martin Briggs, Christopher L. Gazoorian, Daniel H. Doctor, Douglas A. Burns
Permafrost and climate change: Carbon cycle feedbacks from the warming Arctic
Rapid Arctic environmental change affects the entire Earth system as thawing permafrost ecosystems release greenhouse gases to the atmosphere. Understanding how much permafrost carbon will be released, over what time frame, and what the relative emissions of carbon dioxide and methane will be is key for understanding the impact on global climate. In addition, the response of vegetation...
Authors
Edward A.G. Schuur, Benjamin Abbott, Roisin Commane, Jessica G. Ernakovich, Eugenie S. Euskirchen, Gustaf Hugelius, Guido Grosse, Miriam C. Jones, Charlie Koven, Victor Leyshk, David J. Lawrence, Michael M. Loranty, Marguerite Mauritz, David Olefeldt, Susan M. Natali, Heidi Rodenhizer, Verity Salmon, Christina Schadel, Jens Strauss, Claire C. Treat, Merritt R. Turetsky
Shelf ecosystems along the U.S. Atlantic Coastal Plain prior to and during the Paleocene-Eocene Thermal Maximum: Insights into the stratigraphic architecture
The Paleocene-Eocene Thermal Maximum (PETM) is the most pronounced global warming event of the early Paleogene related to atmospheric CO2 increases. It is characterized by negative δ18O and δ13C excursions recorded in sedimentary archives and a transient disruption of the marine biosphere. Sites from the U.S. Atlantic Coastal Plain show an additional small, but distinct δ13C excursion...
Authors
Monika Doubrawa, Peter Stassen, Marci M. Robinson, Tali L. Babila, James C. Zachos, Robert P. Speijer
Lateral moraines, ice-dammed lakes, and meltwater-carved channels in the Pelham, Shutesbury, Leverett area of west-central Massachusetts: A record of Connecticut Valley ice lobe retreat
Temporary ice-dammed glacial lakes formed high in the landscape in several westward sloping valleys on the east side of the Connecticut Valley lowland during late Wisconsinan deglaciation. These lakes were impounded by a lengthy lobe of ice that extended farther south in the lowland than at upland retreatal ice-margin positions (fig. 1). The formation, lowering, and drainage of these ice...
Authors
Janet R. Stone, Mary L. DiGiacomo-Cohen
Very high Middle Miocene surface productivity on the U.S. mid-Atlantic shelf amid glacioeustatic sea level variability
The Miocene Climatic Optimum (MCO) provides important insights into how the climate system operates under elevated temperatures and atmospheric CO2 levels. Few western North Atlantic paleotemperature or paleoecological records exist from the MCO, despite their importance for understanding both regional and global climate dynamics. Here we present quantitative MCO paleoecological data...
Authors
Marci M. Robinson, Harry J. Dowsett, Timothy D. Herbert
Defining the timing, extent, and conditions of Paleozoic metamorphism in the southern Appalachian Blue Ridge terranes of Tennessee, North Carolina, and northern Georgia
The tectonometamorphic evolution of the southern Appalachians, which results from multiple Paleozoic orogenies (Taconic, Neoacadian, and Alleghanian), has lacked a consensus interpretation regarding its thermal-metamorphic history. The Blue Ridge terranes have remained the focus of the debate, with the interpreted timing of regional Barrovian metamorphism and associated deformation...
Authors
J. Ryan Thigpen, David P. Moecher, Harold H. Stowell, Arthur J. Merschat, Robert D. Hatcher, Nicholas E. Powell, Brandon M. Spencer, Calvin A. Mako, Elizabeth M. Bollen, Andrew Kylander-Clark
Biostratigraphically significant palynofloras from the Paleocene–Eocene boundary of the USA
Pollen and spores were recovered from the Paleocene Fort Union Formation and Paleocene–Eocene Willwood Formation of the Bighorn Basin (BHB), northwestern Wyoming, USA. In many local stratigraphic sections in the BHB, the base of the Eocene has been identified by the characteristic negative carbon isotope excursion (CIE) that marks the beginning of the Paleocene–Eocene Thermal Maximum...
Authors
Vera A. Korasidis, Scott L. Wing, Guy J. Harrington, Thomas D. Demchuk, J. Gfavendyck, Phillip E. Jardine, Debra A. Willard
Astrochronology of the Paleocene-Eocene Thermal Maximum on the Atlantic Coastal Plain
The chronology of the Paleocene-Eocene Thermal Maximum (PETM, ~56 Ma) remains disputed, hampering complete understanding of the possible trigger mechanisms of this event. Here we present an astrochronology for the PETM carbon isotope excursion from Howards Tract, Maryland a paleoshelf environment, on the mid-Atlantic Coastal Plain. Statistical evaluation of variations in calcium content...
Authors
Mingsong Li, Timothy J. Bralower, Lee R. Kump, Jean Self-Trail, James C. Zachos, William D. Rush, Marci M. Robinson
Calibrated relative sea levels constrain isostatic adjustment and ice history in northwest Greenland
Relative Sea Levels (RSLs) derived primarily from marine bivalves near Petermann Glacier, NW Greenland, constrain past regional ice-mass changes through glacial isostatic adjustment (GIA) modeling. Oxygen isotopes measured on bivalves corrected for shell-depth habitat and document changing meltwater input. Rapid RSL fall of up to 62 m/kyr indicates ice loss at or prior to ∼9 ka...
Authors
Anna Glueder, Alan C. Mix, Glenn A. Milne, Brendan Reilly, Jorie Clark, Martin Jakobsson, Larry A. Mayer, Stewart Fallon, John R. Southon, June Padman, Andrew Ross, Thomas M. Cronin, Jennifer L. McKay
Don't judge an orogen by its cover: Kinematics of the Appalachian décollement from seismic anisotropy
As North America collided with Africa to form Pangea during the Alleghanian orogeny, crystalline and sedimentary rocks in the southeastern United States were thrust forelandward along the Appalachian décollement. We examined Ps receiver functions to better constrain the kinematics of this prominent subsurface structure. From Southeastern Suture of the Appalachian Margin Experiment...
Authors
Michael G. Frothingham, Vera Schulte-Pelkum, Kevin H. Mahan, Arthur J. Merschat, Makayla Mather, Zulliet Cabrera Gomez
Recent climate change has driven divergent hydrological shifts in high-latitude peatlands
High-latitude peatlands are changing rapidly in response to climate change, including permafrost thaw. Here, we reconstruct hydrological conditions since the seventeenth century using testate amoeba data from 103 high-latitude peat archives. We show that 54% of the peatlands have been drying and 32% have been wetting over this period, illustrating the complex ecohydrological dynamics of...
Authors
Hui Zhang, Minna Väliranta, Graeme T. Swindles, Marco A. Aquino-Lopez, Donal Mullan, Ning Tan, Matthew Amesbury, Kirill Babeshko, Kunshan Bao, Anatoly Bobrov, Viktor Chernyshov, Marissa A. Davies, Andrei-Cosmin Diaconu, Angelica Feurdean, Sarah A. Finkelstein, Michelle Garneau, Zhengtang Guo, Miriam C. Jones, Martin Kay, Eric S. Klein, Maruisz Lamentowicz, Gabriel Magnan, Katarzyna Marcisz, Natalia Mazei, Yuri Mazei, Richard Payne, Nicolas Pelletier, Sanna Piilo, Steve Pratte, Thomas P. Roland, Damir Saldaev, William Shotyk, Thomas G. Sim, Thomas J Sloan, Michał Słowiński, Julie Talbot, Liam Taylor, Andrey N. Tsyganov, Sebastian Wetterich, Wei Xing, Yan Zhao
Using paleoecological data to inform decision making: A deep-time perspective
Latest climate models project conditions for the end of this century that are generally outside of the human experience. These future conditions affect the resilience and sustainability of ecosystems, alter biogeographic zones, and impact biodiversity. Deep-time records of paleoclimate provide insight into the climate system over millions of years and provide examples of conditions very...
Authors
Harry J. Dowsett, Peter Jacobs, Kim de Mutsert