Now showing items 128-147 of 299

    • International Carbon Coordination : Roger Revelle’s legacy in the Intergovernmental Oceanographic Commission 

      Sabine, Christopher L.; Ducklow, Hugh W.; Hood, Maria (Oceanography Society, 2010-09)
      Since its inception in 1960, the Intergovernmental Oceanographic Commission (IOC) has been responsible for organizing and coordinating the scientific investigation of ocean carbon. Roger Revelle (Scripps Institution of ...
    • Introduction to the special issue on Antarctic oceanography in a changing world 

      Ducklow, Hugh W.; Orsi, Alejandro; Wellner, Julia S. (The Oceanography Society, 2012-09)
      "Antarctic Oceanography in a Changing World" commemorates the twentieth anniversary of the commissioning of Research Vessel Icebreaker (RVIB) Nathaniel B. Palmer and the fifteenth anniversary of Antarctic Research and ...
    • Is the northern high-latitude land-based CO2 sink weakening? 

      Hayes, Daniel J.; McGuire, A. David; Kicklighter, David W.; Gurney, Kevin R.; Burnside, T. J.; Melillo, Jerry M. (American Geophysical Union, 2011-08-30)
      Studies indicate that, historically, terrestrial ecosystems of the northern high-latitude region may have been responsible for up to 60% of the global net land-based sink for atmospheric CO2. However, these regions have ...
    • Isotopic signals (18O, 2H, 3H) of six major rivers draining the pan-Arctic watershed 

      Yi, Y.; Gibson, J. J.; Cooper, Lee W.; Helie, J.-F.; Birks, S. J.; McClelland, James W.; Holmes, Robert M.; Peterson, Bruce J. (American Geophysical Union, 2012-03-22)
      We present the results of a 4-year collaborative sampling effort that measured δ18O, δ2H values and 3H activities in the six largest Arctic rivers (the Ob, Yenisey, Lena, Kolyma, Yukon and Mackenzie). Using consistent ...
    • Lability of DOC transported by Alaskan rivers to the Arctic Ocean 

      Holmes, Robert M.; McClelland, James W.; Raymond, Peter A.; Frazer, Breton B.; Peterson, Bruce J.; Stieglitz, Marc (American Geophysical Union, 2008-02-09)
      Arctic rivers transport huge quantities of dissolved organic carbon (DOC) to the Arctic Ocean. The prevailing paradigm is that DOC in arctic rivers is refractory and therefore of little significance for the biogeochemistry ...
    • Land carbon sequestration within the conterminous United States : regional- and state-level analyses 

      Lu, Xiaoliang; Kicklighter, David W.; Melillo, Jerry M.; Reilly, John M.; Xu, Liyi (John Wiley & Sons, 2015-02-28)
      A quantitative understanding of the rate at which land ecosystems are sequestering or losing carbon at national-, regional-, and state-level scales is needed to develop policies to mitigate climate change. In this study, ...
    • A land-to-ocean perspective on the magnitude, source and implication of DIC flux from major Arctic rivers to the Arctic Ocean 

      Tank, Suzanne E.; Raymond, Peter A.; Striegl, Robert G.; McClelland, James W.; Holmes, Robert M.; Fiske, Gregory J.; Peterson, Bruce J. (American Geophysical Union, 2012-12-14)
      A series of seasonally distributed measurements from the six largest Arctic rivers (the Ob', Yenisey, Lena, Kolyma, Yukon and Mackenzie) was used to examine the magnitude and significance of Arctic riverine DIC flux to ...
    • Landscape heterogeneity and the biodiversity of Arctic stream communities : a habitat template analysis 

      Huryn, Alexander D.; Slavik, Karie A.; Lowe, Rex L.; Parker, Stephanie M.; Anderson, Dennis S.; Peterson, Bruce J. (National Research Council Canada, 2005-08-27)
      We predicted that substratum freezing and instability are major determinants of the variability of stream community structure in Arctic Alaska. Their effects were conceptualized as a two-dimensional habitat template that ...
    • Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal 

      Tank, Suzanne E.; Frey, Karen E.; Striegl, Robert G.; Raymond, Peter A.; Holmes, Robert M.; McClelland, James W.; Peterson, Bruce J. (American Geophysical Union, 2012-08-21)
      While much of the dissolved organic carbon (DOC) within rivers is destined for mineralization to CO2, a substantial fraction of riverine bicarbonate (HCO3−) flux represents a CO2 sink, as a result of weathering processes ...
    • A large-scale methane model by incorporating the surface water transport 

      Lu, Xiaoliang; Zhuang, Qianlai; Liu, Yaling; Zhou, Yuyu; AghaKouchak, Amir (John Wiley & Sons, 2016-06-28)
      The effect of surface water movement on methane emissions is not explicitly considered in most of the current methane models. In this study, a surface water routing was coupled into our previously developed large-scale ...
    • Limnology of tundra ponds, Barrow, Alaska 

      Hobbie, John E. (Dowden, Hutchinson & Ross, 1980)
      This book is a report of investigations of several small ponds on the arctic tundra near Barrow, Alaska. The main study, which ran from 1971 through 1973, was funded from three sources: The National Science Foundation, ...
    • Linkages among runoff, dissolved organic carbon, and the stable oxygen isotope composition of seawater and other water mass indicators in the Arctic Ocean 

      Cooper, Lee W.; Benner, Ronald; McClelland, James W.; Peterson, Bruce J.; Holmes, Robert M.; Raymond, Peter A.; Hansell, Dennis A.; Grebmeier, Jacqueline M.; Codispoti, Louis A. (American Geophysical Union, 2005-12-07)
      Concentrations of dissolved organic carbon (DOC) and δ18O values have been determined following sampling of runoff from a number of major arctic rivers, including the Ob, Yenisey, Lena, Kolyma, Mackenzie and Yukon in ...
    • Linking ecology and economics for ecosystem management 

      Farber, Stephen; Costanza, Robert; Childers, Daniel L.; Erickson, Jon; Gross, Katherine; Grove, J. Morgan; Hopkinson, Charles S.; Kahn, James; Pincetl, Stephanie; Troy, Austin; Warren, Paige; Wilson, Matthew (American Institute of Biological Sciences, 2006-02)
      This article outlines an approach, based on ecosystem services, for assessing the trade-offs inherent in managing humans embedded in ecological systems. Evaluating these trade-offs requires an understanding of the biophysical ...
    • Long-term biological effects of petroleum residues on fiddler crabs in salt marshes 

      Culbertson, Jennifer B.; Valiela, Ivan; Peacock, Emily E.; Reddy, Christopher M.; Carter, Anna; VanderKruik, Rachel (2007)
      In September 1969,the Florida barge spilled 700,000 L of No. 2 fuel oil into the salt marsh sediments of Wild Harbor (Buzzards Bay, MA). Today the aboveground environment appears unaffected, but a substantial amount of ...
    • Long-term CO2 enrichment of a forest ecosystem : implications for forest regeneration and succession 

      Mohan, Jacqueline E.; Clark, James S.; Schlesinger, William H. (Ecological Society of America, 2007-06)
      The composition and successional status of a forest affect carbon storage and net ecosystem productivity, yet it remains unclear whether elevated atmospheric carbon dioxide (CO2) will impact rates and trajectories of forest ...
    • Long-term ecological research in a human-dominated world 

      Robertson, G. Philip; Collins, Scott L.; Foster, David R.; Brokaw, Nicholas; Ducklow, Hugh W.; Gragson, Ted L.; Gries, Corinna; Hamilton, Stephen K.; McGuire, A. David; Moore, John C.; Stanley, Emily H.; Waide, Robert B.; Williams, Mark W. (American Institute of Biological Sciences, 2012-04)
      The US Long Term Ecological Research (LTER) Network enters its fourth decade with a distinguished record of achievement in ecological science. The value of long-term observations and experiments has never been more important ...
    • Long-term experimental warming and nutrient additions increase productivity in tall deciduous shrub tundra 

      DeMarco, Jennie; Mack, Michelle C.; Bret-Harte, M. Syndonia; Burton, Mark; Shaver, Gaius R. (Ecological Society of America, 2014-06-19)
      Warming Arctic temperatures can drive changes in vegetation structure and function directly by stimulating plant growth or indirectly by stimulating microbial decomposition of organic matter and releasing more nutrients ...
    • Long-term forest soil warming alters microbial communities in temperate forest soils 

      DeAngelis, Kristen M.; Pold, Grace; Topcuoglu, Begum D.; van Diepen, Linda T. A.; Varney, Rebecca M.; Blanchard, Jeffrey L.; Melillo, Jerry M.; Frey, Serita D. (Frontiers Media, 2015-02-13)
      Soil microbes are major drivers of soil carbon cycling, yet we lack an understanding of how climate warming will affect microbial communities. Three ongoing field studies at the Harvard Forest Long-term Ecological Research ...
    • Long-term studies of the marine ecosystem along the west Antarctic Peninsula 

      Ducklow, Hugh W. (2008-06-27)
      Articles in this volume focus on longer-term studies of the marine ecosystem of the continental shelf west of the Antarctic Peninsula, principally by the Palmer, Antarctica Long- Term Ecological Research project (Ross ...
    • Long-term survival of adult Arctic grayling (Thymallus arcticus) in the Kuparuk River, Alaska 

      Buzby, Karen M.; Deegan, Linda A. (National Research Council Canada, 2004-12-23)
      In many long-lived species such as Arctic grayling (Thymallus arcticus), population growth rate is most sensitive to changes in adult survival probabilities. Understanding the factors that regulate adult survival in this ...