Now showing items 246-265 of 5955

    • Annual and semiannual cycle of equatorial Atlantic circulation associated with basin-mode resonance 

      Brandt, Peter; Claus, Martin; Greatbatch, Richard; Kopte, Robert; Toole, John M.; Johns, William E.; Böning, Claus W. (American Meteorological Society, 2016-10-05)
      Seasonal variability of the tropical Atlantic circulation is dominated by the annual cycle, but semiannual variability is also pronounced, despite weak forcing at that period. This study uses multiyear, full-depth velocity ...
    • The annual cycle of gross primary production, net community production, and export efficiency across the North Pacific Ocean 

      Palevsky, Hilary I.; Quay, Paul D.; Lockwood, Deirdre E.; Nicholson, David P. (John Wiley & Sons, 2016-02-27)
      We measured triple oxygen isotopes and oxygen/argon dissolved gas ratios as nonincubation-based geochemical tracers of gross oxygen production (GOP) and net community production (NCP) on 16 container ship transects across ...
    • The annual cycle of the Japan Sea throughflow 

      Kida, Shinichiro; Qiu, Bo; Yang, Jiayan; Lin, Xiaopei (American Meteorological Society, 2016-01)
      The mechanism responsible for the annual cycle of the flow through the straits of the Japan Sea is investigated using a two-layer model. Observations show maximum throughflow from summer to fall and minimum in winter, ...
    • Annual cycles of ecological disturbance and recovery underlying the subarctic Atlantic spring plankton bloom 

      Behrenfeld, Michael J.; Doney, Scott C.; Lima, Ivan D.; Boss, Emmanuel S.; Siegel, David A. (John Wiley & Sons, 2013-06-20)
      Satellite measurements allow global assessments of phytoplankton concentrations and, from observed temporal changes in biomass, direct access to net biomass accumulation rates (r). For the subarctic Atlantic basin, analysis ...
    • Annual, seasonal, and interannual variability of air-sea heat fluxes in the Indian Ocean 

      Yu, Lisan; Jin, Xiangze; Weller, Robert A. (American Meteorological Society, 2007-07-01)
      This study investigated the accuracy and physical representation of air–sea surface heat flux estimates for the Indian Ocean on annual, seasonal, and interannual time scales. Six heat flux products were analyzed, including ...
    • Anomalous chlorofluorocarbon uptake by mesoscale eddies in the Drake Passage region 

      Song, Hajoon; Marshall, John C.; Gaube, Peter; McGillicuddy, Dennis J. (John Wiley & Sons, 2015-02-23)
      The role of mesoscale eddies in the uptake of anthropogenic chlorofluorocarbon-11 (CFC-11) gas is investigated with a 1/20° eddy-resolving numerical ocean model of a region of the Southern Ocean. With a relatively fast ...
    • Anomalous porosity preservation and preferential accumulation of gas hydrate in the Andaman accretionary wedge, NGHP-01 site 17A 

      Rose, Kelly K.; Johnson, Joel E.; Torres, Marta E.; Hong, Wei-Li; Giosan, Liviu; Solomon, Evan A.; Kastner, Miriam; Cawthern, Thomas; Long, Philip E.; Schaef, H. Todd (Elsevier, 2014-06-06)
      In addition to well established properties that control the presence or absence of the hydrate stability zone, such as pressure, temperature, and salinity, additional parameters appear to influence the concentration of gas ...
    • Antarctic bottom and lower circumpolar deep water circulation in the eastern Indian Ocean 

      Sloyan, Bernadette M. (American Geophysical Union, 2006-02-15)
      Net northward transport below γn > 28.1 kgm−3 (≈3200 m) into the Perth Basin of between 4.4 and 5.8 Sv is estimated from a year-long current meter mooring array between the Broken and Naturaliste Plateaus. Northward ...
    • Antarctic glacial chronology : new constraints from surface exposure dating 

      Ackert, Robert P. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-06)
      Surface exposure dating, using the concentration of cosmogenic nuclides (3He, 21Ne, and 36Cl) in moraine boulders, combined with mapping of glacial moraines from three key locations, is used to provide new constraints ...
    • Antarctic intermediate water circulation in the South Atlantic over the past 25,000 years 

      Howe, Jacob N. W.; Piotrowski, Alexander M.; Oppo, Delia W.; Huang, Kuo-Fang; Mulitza, Stefan; Chiessi, Cristiano M.; Blusztajn, Jerzy S. (John Wiley & Sons, 2016-10-05)
      Antarctic Intermediate Water is an essential limb of the Atlantic meridional overturning circulation that redistributes heat and nutrients within the Atlantic Ocean. Existing reconstructions have yielded conflicting results ...
    • 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, ...
    • Antarctic sea ice—A polar opposite? 

      Maksym, Ted; Stammerjohn, Sharon E.; Ackley, Stephen; Massom, Rob (The Oceanography Society, 2012-09)
      As the world's ice diminishes in the face of climate change—from the dramatic decline in Arctic sea ice, to thinning at the margins of both the Greenland and Antarctic ice sheets, to retreating mountain glaciers the world ...
    • Antarctic sediment chronology by programmed-temperature pyrolysis : methodology and data treatment 

      Rosenheim, Brad E.; Day, Mary Beth; Domack, Eugene; Schrum, Heather; Benthien, Albert; Hayes, John M. (American Geophysical Union, 2008-04-02)
      We report a detailed programmed-temperature pyrolysis/combustion methodology for radiocarbon (14C) dating of Antarctic sub-ice shelf sediments. The method targets the autochthonous organic component in sediments that contain ...
    • Antarctic surface melting dynamics : enhanced perspectives from radar scatterometer data 

      Trusel, Luke D.; Frey, Karen E.; Das, Sarah B. (American Geophysical Union, 2012-05-17)
      Antarctic ice sheet surface melting can regionally influence ice shelf stability, mass balance, and glacier dynamics, in addition to modulating near-surface physical and chemical properties over wide areas. Here, we ...
    • Antarctic-wide array of high-resolution ice core records reveals pervasive lead pollution began in 1889 and persists today 

      McConnell, Joseph R.; Maselli, Olivia J.; Sigl, Michael; Vallelonga, P.; Neumann, T.; Anschutz, H.; Bales, R. C.; Curran, M. A. J.; Das, Sarah B.; Edwards, R.; Kipfstuhl, S.; Layman, Lawrence; Thomas, E. R. (Nature Publishing Group, 2014-07-28)
      Interior Antarctica is among the most remote places on Earth and was thought to be beyond the reach of human impacts when Amundsen and Scott raced to the South Pole in 1911. Here we show detailed measurements from an ...
    • Anthropogenic controls on overwash deposition : evidence and consequences 

      Rogers, Laura J.; Moore, Laura J.; Goldstein, Evan B.; Hein, Christopher J.; Lorenzo-Trueba, Jorge; Ashton, Andrew D. (John Wiley & Sons, 2015-12-29)
      Accelerated sea level rise and the potential for an increase in frequency of the most intense hurricanes due to climate change threaten the vitality and habitability of barrier islands by lowering their relative elevation ...
    • Anthropogenic disturbance of element cycles at the Earth’s surface 

      Sen, Indra S.; Peucker-Ehrenbrink, Bernhard (2012-07)
      The extent to which humans are modifying Earth’s surface chemistry can be quantified by comparing total anthropogenic element fluxes with their natural counterparts (Klee & Graedel, 2004). We quantify anthropogenic mass ...
    • Anthropogenic nutrients and harmful algae in coastal waters 

      Davidson, Keith; Gowen, Richard J.; Harrison, Paul J.; Fleming, Lora E.; Hoagland, Porter; Moschonas, Grigorios (Elsevier, 2014-08-28)
      Harmful algal blooms (HABs) are thought to be increasing in coastal waters worldwide. Anthropogenic nutrient enrichment has been proposed as a principal causative factor of this increase through elevated inorganic and/or ...
    • Anthropogenic ocean acidification over the twenty-first century and its impact on calcifying organisms 

      Orr, James C.; Fabry, Victoria J.; Aumont, Olivier; Bopp, Laurent; Doney, Scott C.; Feely, Richard A.; Gnanadesikan, Anand; Gruber, Nicolas; Ishida, Akio; Joos, Fortunat; Key, Robert M.; Lindsay, Keith; Maier-Reimer, Ernst; Matear, Richard J.; Monfray, Patrick; Mouchet, Anne; Najjar, Raymond G.; Plattner, Gian-Kasper; Rodgers, Keith B.; Sabine, Christopher L.; Sarmiento, Jorge L.; Schlitzer, Reiner; Slater, Richard D.; Totterdell, Ian J.; Weirig, Marie-France; Yamanaka, Yasuhiro; Yool, Andrew (2005-07-29)
      The surface ocean is everywhere saturated with respect to calcium carbonate (CaCO3). Yet increasing atmospheric CO2 reduces ocean pH and carbonate ion concentrations [CO32−] and thus the level of saturation. Reduced ...
    • Anticipating ocean acidification's economic consequences for commercial fisheries 

      Cooley, Sarah R.; Doney, Scott C. (2009-05)
      Ocean acidification, a consequence of rising anthropogenic CO2 emissions, is poised to change marine ecosystems profoundly by increasing dissolved CO2 and decreasing ocean pH, carbonate concentration, and calcium carbonate ...