Search Results - "Douglas, Thomas A."

Changes in the Active, Dead, and Dormant Microbial Community Structure across a Pleistocene Permafrost Chronosequence by Burkert, Alexander, Douglas, Thomas A, Waldrop, Mark P, Mackelprang, Rachel

“…Permafrost hosts a community of microorganisms that survive and reproduce for millennia despite extreme environmental conditions, such as water stress, subzero…”
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Impact of wildfire on permafrost landscapes: A review of recent advances and future prospects by Holloway, Jean E., Lewkowicz, Antoni G., Douglas, Thomas A., Li, Xiaoying, Turetsky, Merritt R., Baltzer, Jennifer L., Jin, Huijun

“…Changes in the frequency and extent of wildfires are expected to lead to substantial and irreversible alterations to permafrost landscapes under a warming…”
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Sublimation of terrestrial permafrost and the implications for ice-loss processes on Mars by Douglas, Thomas A., Mellon, Michael T.

“…Sublimation of ice is rate-controlled by vapor transport away from its outer surface and may have generated landforms on Mars. In ice-cemented ground…”
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Machine learning analyses of remote sensing measurements establish strong relationships between vegetation and snow depth in the boreal forest of Interior Alaska by Douglas, Thomas A, Zhang, Caiyun

“…Abstract The seasonal snowpack plays a critical role in Arctic and boreal hydrologic and ecologic processes. Though snow depth can be markedly different from…”
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Quantification of active layer depth at multiple scales in Interior Alaska permafrost by Brodylo, David, Douglas, Thomas A, Zhang, Caiyun

“…Abstract Much of Interior Alaska is underlain by permafrost that has been thawing at an unprecedented rate. Top-down expansion of the seasonally thawed ‘active…”
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Increased rainfall stimulates permafrost thaw across a variety of Interior Alaskan boreal ecosystems by Douglas, Thomas A., Turetsky, Merritt R., Koven, Charles D.

“…Earth’s high latitudes are projected to experience warmer and wetter summers in the future but ramifications for soil thermal processes and permafrost thaw are…”
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Microbial survival strategies in ancient permafrost: insights from metagenomics by Mackelprang, Rachel, Burkert, Alexander, Haw, Monica, Mahendrarajah, Tara, Conaway, Christopher H, Douglas, Thomas A, Waldrop, Mark P

“…In permafrost (perennially frozen ground) microbes survive oligotrophic conditions, sub-zero temperatures, low water availability and high salinity over…”
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Widespread global peatland establishment and persistence over the last 130,000 y by Treat, Claire C., Kleinen, Thomas, Broothaerts, Nils, Dalton, April S., Dommain, René, Douglas, Thomas A., Drexler, Judith Z., Finkelstein, Sarah A., Grosse, Guido, Hope, Geoffrey, Hutchings, Jack, Jones, Miriam C., Kuhry, Peter, Lacourse, Terri, Lähteenoja, Outi, Loisel, Julie, Notebaert, Bastiaan, Payne, Richard J., Peteet, Dorothy M., Sannel, A. Britta K., Stelling, Jonathan M., Strauss, Jens, Swindles, Graeme T., Talbot, Julie, Tarnocai, Charles, Verstraeten, Gert, Williams, Christopher J., Xia, Zhengyu, Väliranta, Minna, Hättestrand, Martina, Alexanderson, Helena, Brovkin, Victor

“…Glacial–interglacial variations in CO₂ and methane in polar ice cores have been attributed, in part, to changes in global wetland extent, but the wetland…”
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Reviews and syntheses: Changing ecosystem influences on soil thermal regimes in northern high-latitude permafrost regions by Loranty, Michael M., Abbott, Benjamin W., Blok, Daan, Douglas, Thomas A., Epstein, Howard E., Forbes, Bruce C., Jones, Benjamin M., Kholodov, Alexander L., Kropp, Heather, Malhotra, Avni, Mamet, Steven D., Myers-Smith, Isla H., Natali, Susan M., O'Donnell, Jonathan A., Phoenix, Gareth K., Rocha, Adrian V., Sonnentag, Oliver, Tape, Ken D., Walker, Donald A.

“…Soils in Arctic and boreal ecosystems store twice as much carbon as the atmosphere, a portion of which may be released as high-latitude soils warm. Some of the…”
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Linking repeat lidar with Landsat products for large scale quantification of fire-induced permafrost thaw settlement in interior Alaska by Zhang, Caiyun, Douglas, Thomas A, Brodylo, David, Jorgenson, M Torre

“…Abstract The permafrost–fire–climate system has been a hotspot in research for decades under a warming climate scenario. Surface vegetation plays a dominant…”
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Mercury Isotopes Reveal Atmospheric Gaseous Mercury Deposition Directly to the Arctic Coastal Snowpack by Douglas, Thomas A, Blum, Joel D

“…Springtime atmospheric mercury depletion events (AMDEs) lead to snow with elevated mercury concentrations (>200 ng Hg/L) in the Arctic and Antarctic. During…”
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Combining a climate-permafrost model with fine resolution remote sensor products to quantify active-layer thickness at local scales by Zhang, Caiyun, Douglas, Thomas A, Brodylo, David, Bosche, Lauren V, Jorgenson, M Torre

“…Abstract Quantification of active-layer thickness (ALT) over seasonally frozen terrains is critical to understand the impacts of climate warming on permafrost…”
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Thawing permafrost: an overlooked source of seeds for Arctic cloud formation by Creamean, Jessie M, Hill, Thomas C J, DeMott, Paul J, Uetake, Jun, Kreidenweis, Sonia, Douglas, Thomas A

“…As the Arctic warms at twice the global rate, radiative feedbacks from clouds will lead to compounding impacts on the surface energy budget that affect both…”
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Mass-independent fractionation of mercury isotopes in Arctic snow driven by sunlight by Blum, Joel D, Sherman, Laura S, Keeler, Gerald J, Douglas, Thomas A, Johnson, Kelsey P, Barres, James A

“…After polar sunrise in the Arctic, sunlight-induced reactions convert gaseous elemental mercury into compounds that are rapidly deposited to the snowpack…”
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Permafrost microbial communities and functional genes are structured by latitudinal and soil geochemical gradients by Waldrop, Mark P., Chabot, Christopher L., Liebner, Susanne, Holm, Stine, Snyder, Michael W., Dillon, Megan, Dudgeon, Steven R., Douglas, Thomas A., Leewis, Mary-Cathrine, Walter Anthony, Katey M., McFarland, Jack W., Arp, Christopher D., Bondurant, Allen C., Taş, Neslihan, Mackelprang, Rachel

“…Permafrost underlies approximately one quarter of Northern Hemisphere terrestrial surfaces and contains 25–50% of the global soil carbon (C) pool. Permafrost…”
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The role of changing temperature in microbial metabolic processes during permafrost thaw by Messan, Komi S, Jones, Robert M, Doherty, Stacey J, Foley, Karen, Douglas, Thomas A, Barbato, Robyn A

“…Approximately one fourth of the Earth's Northern Hemisphere is underlain by permafrost, earth materials (soil, organic matter, or bedrock), that has been…”
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Photochemical production of molecular bromine in Arctic surface snowpacks by Pratt, Kerri A., Custard, Kyle D., Shepson, Paul B., Douglas, Thomas A., Pöhler, Denis, General, Stephan, Zielcke, Johannes, Simpson, William R., Platt, Ulrich, Tanner, David J., Gregory Huey, L., Carlsen, Mark, Stirm, Brian H.

“…Following the spring-time polar sunrise, ozone concentrations in the lower troposphere episodically decline to near-zero levels. Measurements on Alaskan snow…”
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Convective forcing of mercury and ozone in the Arctic boundary layer induced by leads in sea ice by Moore, Christopher W., Obrist, Daniel, Steffen, Alexandra, Staebler, Ralf M., Douglas, Thomas A., Richter, Andreas, Nghiem, Son V.

“…Sea-ice leads (open water channels), which increase with an ongoing shift from perennial to seasonal sea ice, are shown to initiate convection in the Arctic…”
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Seasonal variation in near-surface seasonally thawed active layer and permafrost soil microbial communities by Baker, Christopher C M, Barker, Amanda J, Douglas, Thomas A, Doherty, Stacey J, Barbato, Robyn A

“…Abstract Understanding how soil microbes respond to permafrost thaw is critical to predicting the implications of climate change for soil processes. However,…”
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Using High‐Resolution Satellite Imagery and Deep Learning to Track Dynamic Seasonality in Small Water Bodies by Mullen, Andrew L., Watts, Jennifer D., Rogers, Brendan M., Carroll, Mark L., Elder, Clayton D., Noomah, Jonas, Williams, Zachary, Caraballo‐Vega, Jordan A., Bredder, Allison, Rickenbaugh, Eliza, Levenson, Eric, Cooley, Sarah W., Hung, Jacqueline K. Y., Fiske, Greg, Potter, Stefano, Yang, Yili, Miller, Charles E., Natali, Susan M., Douglas, Thomas A., Kyzivat, Ethan D.

“…Small water bodies (i.e., ponds; <0.01 km2) play an important role in Earth System processes, including carbon cycling and emissions of methane. Detection and…”
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