Now showing items 1-20 of 71

    • Accelerated freshening of Antarctic Bottom Water over the last decade in the Southern Indian Ocean 

      Menezes, Viviane V.; Macdonald, Alison M.; Schatzman, Courtney (American Association for the Advancement of Science, 2017-01-25)
      Southern Ocean abyssal waters, in contact with the atmosphere at their formation sites around Antarctica, not only bring signals of a changing climate with them as they move around the globe but also contribute to that ...
    • Antarctic penguin response to habitat change as Earth's troposphere reaches 2°C above preindustrial levels 

      Ainley, David G.; Russell, Joellen; Jenouvrier, Stephanie; Woehler, Eric; Lyver, Philip O'B.; Fraser, William R.; Kooyman, Gerald L. (Ecological Society of America, 2010-02)
      We assess the response of pack ice penguins, Emperor (Aptenodytes forsteri) and Adélie (Pygoscelis adeliae), to habitat variability and, then, by modeling habitat alterations, the qualitative changes to their populations, ...
    • Assessing sedimentary records of paleohurricane activity using modeled hurricane climatology 

      Woodruff, Jonathan D.; Donnelly, Jeffrey P.; Emanuel, Kerry A.; Lane, D. Philip (American Geophysical Union, 2008-09-18)
      Patterns of overwash deposition observed within back-barrier sediment archives can indicate past changes in tropical cyclone activity; however, it is necessary to evaluate the significance of observed trends in the context ...
    • Benthic community response to ice algae and phytoplankton in Ny Ålesund, Svalbard 

      McMahon, Kelton W.; Ambrose, William G.; Johnson, Beverly J.; Sun, Ming-Yi; Lopez, Glenn R.; Clough, Lisa M.; Carroll, Michael L. (Inter-Research, 2006-04-03)
      We assessed the digestibility and utilization of ice algae and phytoplankton by the shallow, subtidal benthos in Ny Ålesund (Kongsfjord) on Svalbard (79°N, 12°E) using chlorophyll a (chl a), essential fatty acids (EFAs) ...
    • Calcification by juvenile corals under heterotrophy and elevated CO2 

      Drenkard, Elizabeth J.; Cohen, Anne L.; McCorkle, Daniel C.; de Putron, Samantha J.; Starczak, Victoria R.; Zicht, A. E. (2013-12)
      Ocean acidification (OA) threatens the existence of coral reefs by slowing the rate of calcium carbonate (CaCO3) production of framework-building corals thus reducing the amount of CaCO3 the reef can produce to counteract ...
    • Carbon fluxes and pelagic ecosystem dynamics near two western Antarctic Peninsula Adélie penguin colonies : an inverse model approach 

      Sailley, Sevrine F.; Ducklow, Hugh W.; Moeller, Holly V.; Fraser, William R.; Schofield, Oscar M. E.; Steinberg, Deborah K.; Garzio, Lori M.; Doney, Scott C. (Inter-Research, 2013-10-31)
      An inverse food-web model for the western Antarctic Peninsula (WAP) pelagic food web was constrained with data from Palmer Long Term Ecological Research (PAL-LTER) project annual austral summer sampling cruises. Model ...
    • Carbon turnover in Alaskan tundra soils : effects of organic matter quality, temperature, moisture and fertilizer 

      Shaver, Gaius R.; Giblin, Anne E.; Nadelhoffer, Knute J.; Thieler, K. K.; Downs, M. R.; Laundre, James A.; Rastetter, Edward B. (2006-02-15)
      Soils of tundra and boreal ecosystems contain large organic matter stocks, typically as a layer of peat that blankets the underlying mineral soil. Despite the low productivity of northern vegetation, organic matter accumulates ...
    • Centennial changes of the global water cycle in CMIP5 models 

      Levang, Samuel J.; Schmitt, Raymond W. (American Meteorological Society, 2015-08-15)
      The global water cycle is predicted to intensify under various greenhouse gas emissions scenarios. Here the nature and strength of the expected changes for the ocean in the coming century are assessed by examining the ...
    • Circumpolar analysis of the Adélie Penguin reveals the importance of environmental variability in phenological mismatch 

      Youngflesh, Casey; Jenouvrier, Stephanie; Li, Yun; Ji, Rubio; Ainley, David G.; Ballard, Grant; Barbraud, Christophe; Delord, Karine; Dugger, Katie M.; Emmerson, Louise M.; Fraser, William R.; Hinke, Jefferson T.; Lyver, Philip O'B.; Olmastroni, Silvia; Southwell, Colin J.; Trivelpiece, Susan G.; Trivelpiece, Wayne Z.; Lynch, Heather J. (John Wiley & Sons, 2017-03-20)
      Evidence of climate-change-driven shifts in plant and animal phenology have raised concerns that certain trophic interactions may be increasingly mismatched in time, resulting in declines in reproductive success. Given the ...
    • Climate change threatens polar bear populations : a stochastic demographic analysis 

      Hunter, Christine M.; Caswell, Hal; Runge, Michael C.; Regehr, Eric V.; Amstrup, Steve C.; Stirling, Ian (Ecological Society of America, 2010-10)
      The polar bear (Ursus maritimus) depends on sea ice for feeding, breeding, and movement. Significant reductions in Arctic sea ice are forecast to continue because of climate warming. We evaluated the impacts of climate ...
    • Climate forcing of unprecedented intense-hurricane activity in the last 2000 years 

      Donnelly, Jeffrey P.; Hawkes, Andrea D.; Lane, D. Philip; MacDonald, Dana; Shuman, Bryan N.; Toomey, Michael R.; van Hengstum, Peter J.; Woodruff, Jonathan D. (John Wiley & Sons, 2015-02-23)
      How climate controls hurricane variability has critical implications for society is not well understood. In part, our understanding is hampered by the short and incomplete observational hurricane record. Here we present a ...
    • Climate modulates internal wave activity in the Northern South China Sea 

      DeCarlo, Thomas M.; Karnauskas, Kristopher B.; Davis, Kristen A.; Wong, George T. F. (John Wiley & Sons, 2015-02-10)
      Internal waves (IWs) generated in the Luzon Strait propagate into the Northern South China Sea (NSCS), enhancing biological productivity and affecting coral reefs by modulating nutrient concentrations and temperature. Here ...
    • Cold tongue and warm pool ENSO events in CMIP5 : mean state and future projections 

      Taschetto, Andrea S.; Sen Gupta, Alexander; Jourdain, Nicolas C.; Santoso, Agus; Ummenhofer, Caroline C.; England, Matthew H. (American Meteorological Society, 2014-04-15)
      The representation of the El Niño–Southern Oscillation (ENSO) under historical forcing and future projections is analyzed in 34 models from the Coupled Model Intercomparison Project phase 5 (CMIP5). Most models realistically ...
    • Contrasting sensitivity to extreme winter warming events of dominant sub-Arctic heathland bryophyte and lichen species 

      Bjerke, Jarle W.; Bokhorst, Stef; Zielke, Matthias; Callaghan, Terry V.; Bowles, Francis W.; Phoenix, Gareth K. (2010-12)
      Climate change in northern high latitudes is predicted to be greater in winter rather than summer, yet little is known about the effects of winter climate change on northern ecosystems. Among the unknowns are the effects ...
    • Contributions of long-term research and time-series observations to marine ecology and biogeochemistry 

      Ducklow, Hugh W.; Doney, Scott C.; Steinberg, Deborah K. (2008-05-02)
      Time-series observations form a critical element of oceanography. New interdisciplinary efforts launched in the past two decades complement the few earlier, longer-running time series in building a better, though still ...
    • Decreased mass specific respiration under experimental warming is robust to the microbial biomass method employed 

      Bradford, Mark A.; Wallenstein, Matthew D.; Allison, Steven D.; Treseder, Kathleen K.; Frey, Serita D.; Watts, Brian W.; Davies, Christian A.; Maddox, Thomas R.; Melillo, Jerry M.; Mohan, Jacqueline E.; Reynolds, James F. (2009-05)
      Hartley et al. question whether reduction in Rmass, under experimental warming, arises because of the biomass method. We show the method they treat as independent yields the same result. We describe why the substrate-depletion ...
    • Detection of change in the Arctic using satellite and in situ data 

      Comiso, Josefino C.; Yang, Jiayan; Honjo, Susumu; Krishfield, Richard A. (American Geophysical Union, 2003-12-24)
      The decade of the 1990s was the warmest decade of the last century, while the year 1998 was the warmest year ever observed by modern techniques, with 9 out of 12 months of the year being the warmest months. Satellite ice ...
    • Direct interaction between the Gulf Stream and the shelfbreak south of New England 

      Gawarkiewicz, Glen G.; Todd, Robert E.; Plueddemann, Albert J.; Andres, Magdalena; Manning, James P. (Nature Publishing Group, 2012-08-02)
      Sea surface temperature imagery, satellite altimetry, and a surface drifter track reveal an unusual tilt in the Gulf Stream path that brought the Gulf Stream to 39.9°N near the Middle Atlantic Bight shelfbreak—200 km north ...
    • Early ice retreat and ocean warming may induce copepod biogeographic boundary shifts in the Arctic Ocean 

      Feng, Zhixuan; Ji, Rubao; Campbell, Robert G.; Ashjian, Carin J.; Zhang, Jinlun (John Wiley & Sons, 2016-08-20)
      Early ice retreat and ocean warming are changing various facets of the Arctic marine ecosystem, including the biogeographic distribution of marine organisms. Here an endemic copepod species, Calanus glacialis, was used as ...
    • Ecosystem responses to climate change at a Low Arctic and a High Arctic long-term research site 

      Hobbie, John E.; Shaver, Gaius R.; Rastetter, Edward B.; Cherry, Jessica E.; Goetz, Scott J.; Guay, Kevin C.; Gould, William A.; Kling, George W. (Springer, 2017-01-23)
      Long-term measurements of ecological effects of warming are often not statistically significant because of annual variability or signal noise. These are reduced in indicators that filter or reduce the noise around the ...