Search Results - "Wolfe, Alexander P."

The Anthropocene is functionally and stratigraphically distinct from the Holocene by Waters, Colin N., Zalasiewicz, Jan, Summerhayes, Colin, Barnosky, Anthony D., Poirier, Clément, Galuszka, Agnieszka, Cearreta, Alejandro, Edgeworth, Matt, Ellis, Erle C., Ellis, Michael, Jeandel, Catherine, Leinfelder, Reinhold, McNeill, J. R., deB. Richter, Daniel, Steffen, Will, Syvitski, James, Vidas, Davor, Wagreich, Michael, Williams, Mark, Zhisheng, An, Grinevald, Jacques, Odada, Eric, Oreskes, Naomi, Wolfe, Alexander P.

“…Human activity is leaving a pervasive and persistent signature on Earth. Vigorous debate continues about whether this warrants recognition as a new geologic…”
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A Coherent Signature of Anthropogenic Nitrogen Deposition to Remote Watersheds of the Northern Hemisphere by Holtgrieve, Gordon W., Schindler, Daniel E., Hobbs, William O., Leavitt, Peter R., Ward, Eric J., Bunting, Lynda, Chen, Guangjie, Finney, Bruce P., Gregory-Eaves, Irene, Holmgren, Sofia, Lisac, Mark J., Lisi, Peter J., Nydick, Koren, Rogers, Lauren A., Saros, Jasmine E., Selbie, Daniel T., Shapley, Mark D., Walsh, Patrick B., Wolfe, Alexander P.

“…Humans have more than doubled the amount of reactive nitrogen (Nr) added to the biosphere, yet most of what is known about its accumulation and ecological…”
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Climate change forces new ecological states in tropical Andean lakes by Michelutti, Neal, Wolfe, Alexander P, Cooke, Colin A, Hobbs, William O, Vuille, Mathias, Smol, John P

“…Air temperatures in the tropical Andes have risen at an accelerated rate relative to the global average over recent decades. However, the effects of climate…”
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Stable carbon isotopes of C3 plant resins and ambers record changes in atmospheric oxygen since the Triassic by Tappert, Ralf, McKellar, Ryan C., Wolfe, Alexander P., Tappert, Michelle C., Ortega-Blanco, Jaime, Muehlenbachs, Karlis

“…Estimating the partial pressure of atmospheric oxygen (pO2) in the geological past has been challenging because of the lack of reliable proxies. Here we…”
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Over three millennia of mercury pollution in the Peruvian Andes by Cooke, Colin A, Balcom, Prentiss H, Biester, Harald, Wolfe, Alexander P

“…We present unambiguous records of preindustrial atmospheric mercury (Hg) pollution, derived from lake-sediment cores collected near Huancavelica, Peru, the…”
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Mid-Miocene cooling and the extinction of tundra in continental Antarctica by Lewis, Adam R, Marchant, David R, Ashworth, Allan C, Hedenäs, Lars, Hemming, Sidney R, Johnson, Jesse V, Leng, Melanie J, Machlus, Malka L, Newton, Angela E, Raine, J. Ian, Willenbring, Jane K, Williams, Mark, Wolfe, Alexander P

“…A major obstacle in understanding the evolution of Cenozoic climate has been the lack of well dated terrestrial evidence from high-latitude, glaciated regions…”
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A new proposal concerning the botanical origin of Baltic amber by Wolfe, Alexander P., Tappert, Ralf, Muehlenbachs, Karlis, Boudreau, Marc, McKellar, Ryan C., Basinger, James F., Garrett, Amber

“…Sciadopitys verticillata…”
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Stratigraphic and Earth System approaches to defining the Anthropocene by Steffen, Will, Leinfelder, Reinhold, Zalasiewicz, Jan, Waters, Colin N., Williams, Mark, Summerhayes, Colin, Barnosky, Anthony D., Cearreta, Alejandro, Crutzen, Paul, Edgeworth, Matt, Ellis, Erle C., Fairchild, Ian J., Galuszka, Agnieszka, Grinevald, Jacques, Haywood, Alan, Ivar do Sul, Juliana, Jeandel, Catherine, McNeill, J.R., Odada, Eric, Oreskes, Naomi, Revkin, Andrew, Richter, Daniel deB, Syvitski, James, Vidas, Davor, Wagreich, Michael, Wing, Scott L., Wolfe, Alexander P., Schellnhuber, H.J.

“…Stratigraphy provides insights into the evolution and dynamics of the Earth System over its long history. With recent developments in Earth System science,…”
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Critical Nitrogen Deposition Loads in High-elevation Lakes of the Western US Inferred from Paleolimnological Records by Saros, Jasmine E., Clow, David W., Blett, Tamara, Wolfe, Alexander P.

“…Critical loads of nitrogen (N) from atmospheric deposition were determined for alpine lake ecosystems in the western US using fossil diatom assemblages in lake…”
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Quantifying recent ecological changes in remote lakes of North America and Greenland using sediment diatom assemblages by Hobbs, William O, Telford, Richard J, Birks, H John B, Saros, Jasmine E, Hazewinkel, Roderick R O, Perren, Bianca B, Saulnier-Talbot, Emilie, Wolfe, Alexander P

“…Although arctic lakes have responded sensitively to 20(th)-century climate change, it remains uncertain how these ecological transformations compare with…”
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Pristine Early Eocene wood buried deeply in kimberlite from northern Canada by Wolfe, Alexander P, Csank, Adam Z, Reyes, Alberto V, McKellar, Ryan C, Tappert, Ralf, Muehlenbachs, Karlis

“…We report exceptional preservation of fossil wood buried deeply in a kimberlite pipe that intruded northwestern Canada's Slave Province 53.3±0.6 million years…”
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Synchronous interhemispheric Holocene climate trends in the tropical Andes by Polissar, Pratigya J., Abbott, Mark B., Wolfe, Alexander P., Vuille, Mathias, Bezada, Maximiliano

“…Holocene variations of tropical moisture balance have been ascribed to orbitally forced changes in solar insolation. If this model is correct, millennial-scale…”
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Climate-Driven Regime Shifts in the Biological Communities of Arctic Lakes by Smol, John P., Wolfe, Alexander P., H. John B. Birks, Marianne S. V. Douglas, Jones, Vivienne J., Korhola, Atte, Pienitz, Reinhard, Rühland, Kathleen, Sorvari, Sanna, Antoniades, Dermot, Brooks, Stephen J., Fallu, Marie-Andrée, Hughes, Mike, Keatley, Bronwyn E., Laing, Tamsin E., Michelutti, Neal, Nazarova, Larisa, Nyman, Marjut, Paterson, Andrew M., Perren, Bianca, Quinlan, Roberto, Rautio, Milla, Saulnier-Talbot, Emilie, Siitonen, Susanna, Solovieva, Nadia, Weckström, Jan, Schindler, David W.

“…Fifty-five paleolimnological records from lakes in the circumpolar Arctic reveal widespread species changes and ecological reorganizations in algae and…”
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A Diverse Assemblage of Late Cretaceous Dinosaur and Bird Feathers from Canadian Amber by McKellar, Ryan C., Chatterton, Brian D. E., Wolfe, Alexander P., Currie, Philip J.

“…The fossil record of early feathers has relied on carbonized compressions that lack fine structural detail. Specimens in amber are preserved in greater detail,…”
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Net Ecosystem Production and Carbon Greenhouse Gas Fluxes in Three Prairie Wetlands by Bortolotti, Lauren E, St. Louis, Vincent L, Vinebrooke, Rolf D, Wolfe, Alexander P

“…In central North America, prairie wetlands provide many important ecosystem services including attenuating floods, improving water quality, and supporting…”
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Recent primary production increases in arctic lakes by Michelutti, Neal, Wolfe, Alexander P., Vinebrooke, Rolf D., Rivard, Benoit, Briner, Jason P.

“…A new application of reflectance spectroscopy enables inferences of lake sediment chlorophyll a concentrations and hence of historical trends in lacustrine…”
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Recent changes in a remote Arctic lake are unique within the past 200,000 years by Axford, Yarrow, Briner, Jason P, Cooke, Colin A, Francis, Donna R, Michelutti, Neal, Miller, Gifford H, Smol, John P, Thomas, Elizabeth K, Wilson, Cheryl R, Wolfe, Alexander P

“…The Arctic is currently undergoing dramatic environmental transformations, but it remains largely unknown how these changes compare with long-term natural…”
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Three extant genera of freshwater thalassiosiroid diatoms from Middle Eocene sediments in northern Canada by Wolfe, Alexander P, Siver, Peter A

“…The evolutionary history of diatoms is only constrained partially by the fossil record. The timing of several key events, such as initial colonization of…”
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Climatically controlled chemical and biological development in Arctic lakes by Michelutti, Neal, Wolfe, Alexander P., Briner, Jason P., Miller, Gifford H.

“…We investigated the factors controlling lake evolution in Arctic ecosystems using a multiproxy paleolimnological approach on a small lake on Baffin Island,…”
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The Anthropocene: a conspicuous stratigraphical signal of anthropogenic changes in production and consumption across the biosphere by Williams, Mark, Zalasiewicz, Jan, Waters, Colin N., Edgeworth, Matt, Bennett, Carys, Barnosky, Anthony D., Ellis, Erle C., Ellis, Michael A., Cearreta, Alejandro, Haff, Peter K., Ivar do Sul, Juliana A., Leinfelder, Reinhold, McNeill, John R., Odada, Eric, Oreskes, Naomi, Revkin, Andrew, Richter, Daniel deB, Steffen, Will, Summerhayes, Colin, Syvitski, James P., Vidas, Davor, Wagreich, Michael, Wing, Scott L., Wolfe, Alexander P., Zhisheng, An

“…Biospheric relationships between production and consumption of biomass have been resilient to changes in the Earth system over billions of years. This…”
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