Publications
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Predicted vulnerability of carbon in permafrost peatlands With future climate change and permafrost thaw in western Canada Predicted vulnerability of carbon in permafrost peatlands With future climate change and permafrost thaw in western Canada
Climate warming in high-latitude regions is thawing carbon-rich permafrost soils, which can release carbon to the atmosphere and enhance climate warming. Using a coupled model of long-term peatland dynamics (Holocene Peat Model, HPM-Arctic), we quantify the potential loss of carbon with future climate warming for six sites with differing climates and permafrost histories in Northwestern...
Authors
Claire C. Treat, Miriam C. Jones, Jay R. Alder, A. Britta K. Sannel, Philip Camill, Steve Frolking
Stable oxygen isotopes in shallow marine ostracodes from the northern Bering and Chukchi Seas Stable oxygen isotopes in shallow marine ostracodes from the northern Bering and Chukchi Seas
Stable oxygen isotope measurements on calcitic valves of benthic ostracodes (δ18Oost) from the northern Bering and Chukchi Seas were used to examine ecological and hydrographic processes governing ostracode and associated seawater δ18O values. Five cryophilic taxa were analyzed for δ18Oost values: Sarsicytheridea bradii; Paracyprideis pseudopunctillata; Heterocyprideis sorbyana...
Authors
Laura Gemery, L.W. Cooper, C Magen, T. M. Cronin, J.M. Grebmeier
Synthesis of geochronologic research on Late Pliocene to Holocene emergent shorelines in the lower Savannah River area of southeastern Georgia, USA Synthesis of geochronologic research on Late Pliocene to Holocene emergent shorelines in the lower Savannah River area of southeastern Georgia, USA
Emergent late Pliocene and Pleistocene shoreline deposits, morphologically identifiable Pleistocene shoreline units, and seaward-facing scarps characterize the easternmost Atlantic Coastal Plain (ACP) of the United States of America. In some areas of the ACP, these deposits, units, and scarps have been studied in detail. Within these areas, temporal and spatial data are sufficient for...
Authors
Helaine W. Markewich, Milan J. Pavich, Shannon A. Mahan, Paul R. Bierman, Wilma B. Aleman-Gonzalez, Arthur P. Schultz
Remote sensing inventory and geospatial analysis of brick kilns and clay quarrying in Kabul, Afghanistan Remote sensing inventory and geospatial analysis of brick kilns and clay quarrying in Kabul, Afghanistan
Reconstruction and urban development in Kabul, Afghanistan, has prompted vast expansion of the clay quarrying and brick making industry. This study identified the extent and distribution of clay quarrying and brick kilns in the greater Kabul area between 1965 and 2018. Very high-resolution satellite imagery was interpreted to quantify and characterize the type, number, and location of...
Authors
Jessica D. DeWitt, Peter G. Chirico, Marissa A. Alessi, Kathleen M Boston
Unmixing multiple metamorphic muscovite age populations with powder X-ray diffraction and 40Ar/39Ar analysis Unmixing multiple metamorphic muscovite age populations with powder X-ray diffraction and 40Ar/39Ar analysis
A combination of modal estimates from powder X-ray diffraction (XRD) experiments and argon isotopic data shows that muscovite 40Ar/39Ar total gas age correlates with muscovite composition near the retrograde Bald Mountain shear zone (BMSZ) in Claremont, New Hampshire, and that the shear zone was active at ∼245 Ma. Petrologic study demonstrates that chemical disequilibrium is preserved in...
Authors
Ryan J. McAleer, David Bish, Michael J. Kunk, Peter M. Valley, Gregory J. Walsh, Robert Wintsch
Carbon fluxes and microbial activities from boreal peatlands experiencing permafrost thaw Carbon fluxes and microbial activities from boreal peatlands experiencing permafrost thaw
Permafrost thaw in northern ecosystems may cause large quantities of carbon (C) to move from soil to atmospheric pools. Because soil microbial communities play a critical role in regulating C fluxes from soils, we examined microbial activity and greenhouse gas production soon after permafrost thaw and ground collapse (into collapse-scar bogs), relative to the permafrost plateau or older...
Authors
Mark Waldrop, Jack McFarland, Kristen L. Manies, Mary-Cathrine Leewis, Steve Blazewicz, Miriam C. Jones, Rebecca Neumann, Jason Keller, Rachel Cohen, Eugenie S. Euskirchen, Colin W. Edgar, Merritt R. Turetsky, William Cable
Foreward: The paleoclimatic and paleobiogeographic significance of the Tjörnes Basin, Northern Iceland Foreward: The paleoclimatic and paleobiogeographic significance of the Tjörnes Basin, Northern Iceland
Since the mid-19th century, geologists and paleontologists have recognized the scientific importance and unique nature of the richly fossiliferous sediments exposed along the Tjörnes Peninsula in Northern Iceland. In the following century and a half, Tjörnes has attracted the attention of an international “who’s who” in Cenozoic paleontology, as well as many paleoclimatologists...
Authors
Thomas M. Cronin
Spatiotemporal patterns of northern lake formation since the last glacial maximum Spatiotemporal patterns of northern lake formation since the last glacial maximum
The northern mid- to high-latitudes have the highest total number and area of lakes on Earth. Lake origins in these regions are diverse, but to a large extent coupled to glacial, permafrost, and peatland histories. The synthesis of 1207 northern lake initiation records presented here provides an analog for rapid landscape-level change in response to climate warming, and its subsequent...
Authors
L. S. Brosius, K. M. Walter Anthony, C. C. Treat, J. Lenz, Miriam C. Jones, M. Syndonia Bret-Harte, G. Grosse
Improved wetland soil organic carbon stocks of the conterminous U.S. through data harmonization Improved wetland soil organic carbon stocks of the conterminous U.S. through data harmonization
Wetland soil stocks are important global repositories of carbon (C) but are difficult to quantify and model due to varying sampling protocols, and geomorphic/spatio-temporal discontinuity. Merging scales of soil-survey spatial extents with wetland-specific point-based data offers an explicit, empirical and updatable improvement for regional and continental scale soil C stock assessments...
Authors
Bergit Rose Uhran, Lisamarie Windham-Myers, Norman B. Bliss, Amanda M. Nahlik, Eric T. Sundquist, Camille L. Stagg
River terrace evidence of tectonic processes in the eastern North American plate interior, South Anna River, Virginia River terrace evidence of tectonic processes in the eastern North American plate interior, South Anna River, Virginia
We show that long-recognized seismicity in the central Virginia seismic zone of the eastern North American intraplate setting arises primarily from tectonic processes predicted by new, fully coupled plate tectonic geodynamic models. The study leverages much new geophysical and geologic data following the 2011 Mineral, Virginia, earthquake that ruptured a steeply dipping, northwest...
Authors
Frank J. Pazzaglia, Helen F. Malenda, Matthew L. McGavick, Cody Raup, Mark W. Carter, Claudio Berti, Shannon A. Mahan, Michelle S. Nelson, Tammy M. Rittenour, Ron Counts, Jane K Willenbring, Dru Germanoski, Stephen C. Peters, William D. Holt
Subsea permafrost carbon stocks and climate change sensitivity estimated by expert assessment Subsea permafrost carbon stocks and climate change sensitivity estimated by expert assessment
The continental shelves of the Arctic Ocean and surrounding seas contain large stocks of organic matter (OM) and methane (CH4), representing a potential ecosystem feedback to climate change not included in international climate agreements. We performed a structured expert assessment with 25 permafrost researchers to combine quantitative estimates of the stocks and sensitivity of organic...
Authors
Sara Sayedi, B.F. Thornton, Benjamin Abbott, Jennifer M. Frederick, Jorien E. Vonk, Paul Overduin, Christina Schadel, E.A.G. Schuur, A. Bourbonnais, N. Demidova, Anatoly Gavrilov, Shengping He, Gustaf Gustaf Hugelius, Martin Jakobsson, Miriam C. Jones, DoongJoo Joung, Gleb Kraev, Robie W. Macdonald, A. David McGuire, Cuicui Mu, M. O’Regan, Kathryn M. Schreiner, Christian Stranne, Elena Pizhankova, A. Vasiliev, S. Westermann, Jay P. Zarnetske, Tingjun Zhang, M Ghandehari, Sarah Baeumler, Brian C. Brown, Rebecca J. Frei
Depositional sequence stratigraphy of Turonian to Santonian sediments, Cape Fear arch, North Carolina Coastal Plain, USA Depositional sequence stratigraphy of Turonian to Santonian sediments, Cape Fear arch, North Carolina Coastal Plain, USA
A new sequence stratigraphic framework for Turonian to Santonian (94-84 Ma) sediments is established using data from the USGS Kure Beach and Elizabethtown cores collected from the Atlantic Coastal Plain of North Carolina (NC). These sediments represent some of the oldest marine units deposited on the southeastern Atlantic Coastal Plain and record the early development of a clastic wedge...
Authors
Wilma Aleman Gonzalez, Jean Self-Trail, W. Burleigh Harris, Jessica P. Moore, Kathleen Farrell