Publications
Filter Total Items: 890
Permafrost history in the sporadic zone as context for recent carbon loss using acryostratigraphy, plant macrofossil, and stable isotope approach Permafrost history in the sporadic zone as context for recent carbon loss using acryostratigraphy, plant macrofossil, and stable isotope approach
Permafrost and landscape history, in addition to ground ice content, are increasingly identified as important components in predicting permafrost thaw trajectories. Together with cryostratigraphy, plant remains and stable isotopes can provide useful information about past permafrost aggradation and thaw. We applied these methods with radiocarbon dating on peat and permafrost cores in the...
Authors
Miriam C. Jones, Lesleigh Anderson, Eva Anne Stephani, Benjamin M. Jones
Isotopic evidence against North Pacific Deep Water formation during late Pliocene warmth Isotopic evidence against North Pacific Deep Water formation during late Pliocene warmth
Several modelling and observational studies suggest deep water formation in the subpolar North Pacific as a possible alternative mode of thermohaline circulation that occurred in the warm Pliocene, a time when global atmospheric partial pressure of carbon dioxide was like the modern atmosphere (~400 ppm). We test this hypothesis by measuring the δ13C of the benthic foraminifer...
Authors
Joseph Novak, Rocio Caballero-Gill, Rebecca Rose, Timothy D. Herbert, Harry J. Dowsett
Connecting conservation practices to local stream health in the Chesapeake Bay watershed Connecting conservation practices to local stream health in the Chesapeake Bay watershed
The Chesapeake Bay Partnership is implementing conservation practices (CPs) throughout the Chesapeake Bay watershed to reduce nutrient and sediment delivery to the Bay. This study intends to provide an integrated and detailed understanding of how local streams respond to these CP-driven management efforts. Key issue: To what extent do CPs positively affect the health of local streams in...
Authors
Gregory E. Noe, Paul L. Angermeier, Larry B. Barber, Joe Buckwalter, Matthew J. Cashman, Olivia Devereux, Thomas Rossiter Doody, Sally Entrekin, Rosemary Margaret Fanelli, Nathaniel P. Hitt, Molly Elizabeth Huber, Jeramy Roland Jasmann, Kelly O. Maloney, Tristan Gregory Mohs, Sergio Sabat-Bonilla, Kelly Smalling, Tyler Wagner, John C. Wolf, Kenneth Hyer
Discovery of giant and conventional magnetofossils bookending Cretaceous Oceanic Anoxic Event 2 Discovery of giant and conventional magnetofossils bookending Cretaceous Oceanic Anoxic Event 2
Conventional magnetofossils are the remains of magnetotactic bacteria and giant magnetofossils are the remains of iron biomineralizing organisms that have not yet been identified. We report the oldest robust conventional and giant magnetofossil records, ~97 Ma, from marine sediments drilled in Holland Park, Virginia, USA. The Holland Park core records the Cenomanian-Turonian boundary and...
Authors
Courtney L. Wagner, Ioan Lascu, Jean Self-Trail, Tim Gooding, Kenneth J.T. Livi, Gianna Greger, Kristina Frank Gardner, Jody Brae Wycech, Mark F. Dreier, Tom Oliver
Pliocene–Pleistocene warm-water incursions and water mass changes on the Ross Sea continental shelf (Antarctica) based on foraminifera from IODP Expedition 374 Pliocene–Pleistocene warm-water incursions and water mass changes on the Ross Sea continental shelf (Antarctica) based on foraminifera from IODP Expedition 374
International Ocean Discovery Program (IODP) Expedition 374 sailed to the Ross Sea in 2018 to reconstruct paleoenvironments, track the history of key water masses, and assess model simulations that show warm-water incursions from the Southern Ocean led to the loss of marine-based Antarctic ice sheets during past interglacials. IODP Site U1523 (water depth 828 m) is located at the...
Authors
Julia Lynn Seidenstein, R. Mark Leckie, Robert McKay, L. De Santis, David Harwood
Modeling the mid-Piacenzian warm climate using the water isotope-enabled Community Earth System Model (iCESM1.2-ITPCAS) Modeling the mid-Piacenzian warm climate using the water isotope-enabled Community Earth System Model (iCESM1.2-ITPCAS)
The mid-Piacenzian Warm Period (MPWP, ~ 3.264–3.025 Ma) is the most recent example of a persistently warmer climate in equilibrium with atmospheric CO2 concentrations similar to today. Towards studying patterns and dynamics of a warming climate the MPWP is often compared to today. Following the Pliocene Model Intercomparison Project, Phase 2 (PlioMIP2) protocol we prepare a water isotope...
Authors
Yong Sun, Baohuang Su, Harry J. Dowsett, Haibin Wu, Jun Hu, Christian Stepanek, Zhongyu Xiong, Xiayu Yuan, Gilles Ramstein
Turning setbacks into stepping-stones for growth in conservation paleobiology Turning setbacks into stepping-stones for growth in conservation paleobiology
Conservation paleobiology is a cross-disciplinary field that utilizes the geohistorical record of past life on Earth to inform present-day decisions in conservation and restoration and assist in planning for future natural resource management. However, information on how past ecosystems and species responded to environmental change over decadal to millennial timescales is rarely...
Authors
G. Lynn Wingard, Chris L. Schneider, Gregory P. Dietl, Damien A. Fordham
Decomposition of physical processes controlling EASM precipitation changes during the mid-Piacenzian: New insights into data–model integration Decomposition of physical processes controlling EASM precipitation changes during the mid-Piacenzian: New insights into data–model integration
The mid-Piacenzian warm period (MPWP, ~3.264–3.025 Ma) has gained widespread interest due to its partial analogy with future climate. However, quantitative data–model comparison of East Asian Summer Monsoon (EASM) precipitation during the MPWP is relatively rare, especially due to problems in decoding the imprint of physical processes to climate signals in the records. In this study...
Authors
Yong Sun, Haibin Wu, Lixin Chen, Christian Stepanek, Yan Zhao, Ning Tan, Baohuang Su, Xiayu Yuan, Wenchao Zhang, Bo Liu, Stephen Hunter, Alan M Haywood, Ayako Abe-Ouchi, Bette Otto-Bliesner, Camille Contoux, Daniel J. Lunt, Aisling M Dolan, Deepak Chandan, Gerrit Lohmann, Harry J. Dowsett, Julia C. Tindall, Michiel Baatsen, W. Richard Peltier, Qiang Li, Ran Feng, Ulrich Salzmann, Wing-Le Chan, Zhongshi Zhang, Charles J. R. Williams, Gilles Ramstein
Sight and blindness: The relationship between ostracod eyes, water depth, and light availability in the Arctic Ocean Sight and blindness: The relationship between ostracod eyes, water depth, and light availability in the Arctic Ocean
Eye loss has been a long-standing interest in evolutionary biology. Many organisms that inhabit environments without light penetration, for example the deep sea, exhibit eye loss and thus become blind. However, water-depth distribution of eyes in marine organisms is poorly understood. Ostracods are widely distributed crustaceans, and many sighted marine ostracods have eye tubercles...
Authors
Jingwen Zhang, Moriaki Yasuhara, Chih-Lin Wei, Skye Yunshu Tian, Kyawt K. T. Aye, Laura Gemery, Thomas M. Cronin, Peter Frenzel, David J. Horne
Atlas of microscopic images of biochar using reflected light microscopy in biochar characterization Atlas of microscopic images of biochar using reflected light microscopy in biochar characterization
Derived through the thermochemical conversion of biomass, biochar is a carbon-rich substance recognized for its significance in environmental applications and sustainable agriculture. As interest in its utilization continues to rise, it becomes crucial to comprehend how the source material and pyrolysis parameters influence the properties of biochar and, consequently, to research the...
Authors
Agnieszka Drobniak, Maria Mastalerz, Will Knauth, Omid Adarkani, Telma Ataide dos Santos, Valdeci Caio de Faria, Tara Congo, Paul C. Hackley, Javin J. Hatcherian, James C. Hower, Henrik I. Petersen, Julito Reyes, Hamed Sanei
Ancient permafrost and past permafrost in the Northern Hemisphere Ancient permafrost and past permafrost in the Northern Hemisphere
The existence and dynamics of permafrost depend on the prevailing climate conditions. Therefore, the study of ancient permafrost (existing since the Pleistocene or earlier) and past permafrost (Late Pleistocene or older permafrost that no longer exists) and their dynamics may inform about climate and environmental changes in the past. In this chapter, we provide a brief overview of...
Authors
Thomas Opel, Pascal Bertran, Guido Grosse, Miriam C. Jones, Marc Luetscher, Lutz Schirrmeister, Kim Stadelmeier, Alexandra Veremeeva
Evaluating an improved systems approach to wetland crediting: Consideration of wetland ecosystem services Evaluating an improved systems approach to wetland crediting: Consideration of wetland ecosystem services
The Chesapeake Bay Agreement (CBA) has numerous direct goals for improving habitat, living resources, and water quality, conserving lands, engaging communities and addressing a changing climate. To date, the progress toward the wetlands outcome (creation/ restoration of 85,000 acres and enhancement of 150,000 acres) has been very slow and the outcome is projected to be off course for...
Authors
Pamela Mason, Gregory E. Noe, Alicia Berlin, Denise Clearwater, Sally Claggett, Dave Goerman, Brooke J. Landry, Alison Santoro