Now showing items 3225-3244 of 8210

    • Heterogeneous rupture in the great Cascadia earthquake of 1700 inferred from coastal subsidence estimates 

      Wang, Pei-Ling; Engelhart, Simon E.; Wang, Kelin; Hawkes, Andrea D.; Horton, Benjamin P.; Nelson, Alan R.; Witter, Robert C. (John Wiley & Sons, 2013-05-15)
      Past earthquake rupture models used to explain paleoseismic estimates of coastal subsidence during the great A.D. 1700 Cascadia earthquake have assumed a uniform slip distribution along the megathrust. Here we infer ...
    • Heterogeneous seismic velocity structure of the upper lithosphere at Kane oceanic core complex, Mid-Atlantic Ridge 

      Xu, Min; Canales, J. Pablo; Tucholke, Brian E.; DuBois, David L. (American Geophysical Union, 2009-10-10)
      The Kane oceanic core complex (OCC) is a large, corrugated megamullion that was formed by a long-lived detachment fault at the axis of the Mid-Atlantic Ridge adjacent to Kane Fracture Zone between 2.1 and 3.3 Ma. We use ...
    • Heterotrophic Archaea dominate sedimentary subsurface ecosystems off Peru 

      Biddle, Jennifer F.; Lipp, Julius S.; Lever, Mark A.; Lloyd, Karen G.; Sorensen, Ketil B.; Anderson, Rika E.; Fredricks, Helen F.; Elvert, Marcus; Kelly, Timothy J.; Schrag, Daniel P.; Sogin, Mitchell L.; Brenchley, Jean E.; Teske, Andreas; House, Christopher H.; Hinrichs, Kai-Uwe (National Academy of Sciences, 2006-02-27)
      Studies of deeply buried, sedimentary microbial communities and associated biogeochemical processes during Ocean Drilling Program Leg 201 showed elevated prokaryotic cell numbers in sediment layers where methane is consumed ...
    • Heterotrophic respiration in disturbed forests : a review with examples from North America 

      Harmon, Mark E.; Bond-Lamberty, Ben; Tang, Jianwu; Vargas, Rodrigo (American Geophysical Union, 2011-05-14)
      Heterotrophic respiration (RH) is a major process releasing carbon to the atmosphere and is essential to understanding carbon dynamics in terrestrial ecosystems. Here we review what is known about this flux as related to ...
    • Hierarchical and dynamic seascapes : a quantitative framework for scaling pelagic biogeochemistry and ecology 

      Kavanaugh, Maria T.; Hales, Burke; Saraceno, Martin; Spitz, Yvette H.; White, Angelicque E.; Letelier, Ricardo M. (2013-10-07)
      Comparative analyses of oceanic ecosystems require an objective framework to define coherent study regions and scale the patterns and processes observed within them. We applied the hierarchical patch mosaic paradigm of ...
    • Hierarchical neighbor effects on mycorrhizal community structure and function 

      Moeller, Holly; Dickie, Ian A.; Peltzer, Duane; Fukami, Tadashi (John Wiley & Sons, 2016-07-05)
      Theory predicts that neighboring communities can shape one another's composition and function, for example, through the exchange of member species. However, empirical tests of the directionality and strength of these effects ...
    • High apex predator biomass on remote Pacific islands 

      Stevenson, Charlotte; Katz, Laure S.; Micheli, Fiorenza; Block, Barbara A.; Heiman, Kimberly W.; Perle, Chris; Weng, Kevin; Dunbar, Robert B.; Witting, Jan H. (2006-09-06)
      On coral reefs in Palmyra—a central Pacific atoll with limited fishing pressure—total fish biomass is 428 and 299% greater than on reefs in nearby Christmas and Fanning Islands. Large apex predators –groupers, sharks, ...
    • High biomass, low export regimes in the Southern Ocean 

      Lam, Phoebe J.; Bishop, James K. B. (2006-06-28)
      This paper investigates ballasting and remineralization controls of carbon sedimentation in the twilight zone (100-1000 m) of the Southern Ocean. Size-fractionated (<1 μm, 1-51 μm, >51 μm) suspended particulate matter ...
    • High concentrations and turnover rates of DMS, DMSP and DMSO in Antarctic sea ice 

      Asher, Elizabeth C.; Dacey, John W. H.; Mills, Matthew M.; Arrigo, Kevin R.; Tortell, Philippe D. (American Geophysical Union, 2011-12-14)
      The vast Antarctic sea-ice zone (SIZ) is a potentially significant source of the climate-active gas dimethylsulfide (DMS), yet few data are available on the concentrations and turnover rates of DMS and the related compounds ...
    • High concentrations of marine snow and diatom algal mats in the North Pacific Subtropical Gyre : implications for carbon and nitrogen cycles in the oligotrophic ocean 

      Pilskaln, Cynthia H.; Villareal, Tracy A.; Dennett, Mark R.; Darkangelo-Wood, C.; Meadows, G. (2005-08-02)
      A Video Plankton Recorder (VPR) and remotely operated vehicle (ROV) were utilized on three cruises in the oligotrophic North Pacific Subtropical Gyre (NPSG) between 1995 and 2002 to quantify the size and abundance of marine ...
    • High connectivity among locally adapted populations of a marine fish (Menidia menidia) 

      Clarke, Lora M.; Munch, Stephan B.; Thorrold, Simon R.; Conover, David O. (Ecological Society of America, 2010-12)
      Patterns of connectivity are important in understanding the geographic scale of local adaptation in marine populations. While natural selection can lead to local adaptation, high connectivity can diminish the potential for ...
    • High continuous bandwidth multichannel acquisition system 

      von der Heydt, Keith (Woods Hole Oceanographic Institution, 1991-06)
      Multichannel data acquisition has been a keystone of 7 ONR sponsored Arctic acoustic research programs conducted jointly by WHOI and MIT investigators from 1978 through 1989. This report describes the status and capability ...
    • High density and ligand affinity confer ultrasensitive signal detection by a guanylyl cyclase chemoreceptor 

      Pichlo, Magdalena; Bungert-Plumke, Stefanie; Weyand, Ingo; Seifert, Reinhard; Bonigk, Wolfgang; Strunker, Timo; Kashikar, Nachiket D.; Goodwin, Normann; Muller, Astrid; Pelzer, Patric; Van, Qui; Enderlein, Jorg; Klemm, Clementine; Krause, Eberhard; Trotschel, Christian; Poetsch, Ansgar; Kremmer, Elisabeth; Kaupp, U. Benjamin (Rockefeller University Press, 2014-08-18)
      Guanylyl cyclases (GCs), which synthesize the messenger cyclic guanosine 3′,5′-monophosphate, control several sensory functions, such as phototransduction, chemosensation, and thermosensation, in many species from worms ...
    • High dimethylsulfide photolysis rates in nitrate-rich Antarctic waters 

      Toole, Dierdre A.; Kieber, David J.; Kiene, Ronald P.; White, E. M.; Bisgrove, J.; del Valle, Daniela A.; Slezak, D. (American Geophysical Union, 2004-06-09)
      The photochemistry of dimethylsulfide (DMS) was examined in the Southern Ocean to assess its impact on the biogeochemical dynamics of DMS in Antarctic waters. Very high DMS photolysis rate constants (0.16–0.23 h−1) were ...
    • High molecular weight (HMW) dissolved organic matter (DOM) in seawater : chemical structure, sources and cycling 

      Aluwihare, Lihini I. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1999-04)
      The goal of this thesis was to use high resolution analytical techniques coupled with molecular level analyses to chemically characterize high molecular weight (> 1 k Da (HMW)) dissolved organic matter (DOM) isolated ...
    • High molecular weight dissolved organic matter enrichment selects for methylotrophs in dilution to extinction cultures 

      Sosa, Oscar A.; Gifford, Scott M.; Repeta, Daniel J.; DeLong, Edward F. (Nature Publishing Group, 2015-05-15)
      The role of bacterioplankton in the cycling of marine dissolved organic matter (DOM) is central to the carbon and energy balance in the ocean, yet there are few model organisms available to investigate the genes, metabolic ...
    • High particle export over the continental shelf of the west Antarctic Peninsula 

      Buesseler, Ken O.; McDonnell, Andrew M. P.; Schofield, Oscar M. E.; Steinberg, Deborah K.; Ducklow, Hugh W. (American Geophysical Union, 2010-11-24)
      Drifting cylindrical traps and the flux proxy 234Th indicate more than an order of magnitude higher sinking fluxes of particulate carbon and 234Th in January 2009 than measured by a time-series conical trap used regularly ...
    • The High Resolution Profiler (HRP) : user’s guide and software modifications documentation 

      Montgomery, Ellyn T. (Woods Hole Oceanographic Institution, 1991-01)
      This report provides a User's Guide for operation of the High Resolution ProfIer (HRP) and documentation of the software structure and recent modifications. The HRP is an instrument that acquires and stores up to 16 types ...
    • High resolution profiler study of deep mixing in the Romanche fracture zone 

      Montgomery, Ellyn T. (Woods Hole Oceanographic Institution, 1996-10)
      Between November 20 and December 10, 1994, studies of the deep mixing processes in the Romanche Fracture Zone (RFZ) of the Mid-Atlantic Ridge were conducted from the French research vessel N/O le Noroit. Oceanographers ...
    • High source levels and small active space of high-pitched song in bowhead whales (Balaena mysticetus) 

      Tervo, Outi M.; Christoffersen, Mads F.; Simon, Malene; Miller, Lee A.; Jensen, Frants H.; Parks, Susan E.; Madsen, Peter T. (Public Library of Science, 2012-12-26)
      The low-frequency, powerful vocalizations of blue and fin whales may potentially be detected by conspecifics across entire ocean basins. In contrast, humpback and bowhead whales produce equally powerful, but more complex ...