Browsing Oceanography by Title
Now showing items 72-91 of 152
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Madden-Julian Oscillation and sea level: Local and remote forcing
(American Geophysical Union, 2010-01)The Madden-Julian Oscillation (MJO) is the dominant mode of atmospheric variability in the tropical atmosphere on intraseasonal time scales (i.e., weeks to seasons). This study examines the connection between the MJO and ... -
Mapping coastal optical and biogeochemical variability using an autonomous underwater vehicle and a new bio-optical inversion algorithm
(2004-08)Autonomous underwater vehicles (AUVs) can map water conditions at high spatial ( horizontal and vertical) and temporal resolution, including under cloudy conditions when satellite and airborne remote sensing are not feasible. ... -
Mapping the relationship between northern hemisphere winter surface air temperature and the Madden-Julian oscillation
(American Meteorological Society, 2011-08)A regression-based modeling approach is described for mapping the dependence of atmospheric state variables such as surface air temperature (SAT) on the Madden-Julian oscillation (MJO). For the special case of a linear ... -
Mean mixed depth of sediments; the wherefore and the why
(American Society of Limnology and Oceanography, Ann Arbor, MI, 1998-05)No abstract available. -
The mean surface circulation of the North Atlantic subpolar gyre: A comparison of estimates derived from new gravity and oceanographic measurements
(2011-08)A new mean sea surface topography (MSST) is used to estimate the surface circulation of the subpolar gyre of the northwest Atlantic. The MSST is produced using a new geoid model derived from a blend of gravity data from ... -
Mean surface topography of the northwest Atlantic: Comparison of estimates based on satellite, terrestrial gravity, and oceanographic observations
(American Geophysical Union, 2009-07/08)The accuracy of a new mean sea surface topography (MSST) of the northwest Atlantic is assessed. The MSST is estimated from 12 years of altimeter observations referenced with respect to a new regional geoid based on a blend ... -
Measurements of methyl chloride in the Northwest Atlantic
(American Geophysical Union, 1994-04)Methyl chloride was measured directly in seawater using a purge and trap system and gas chromatography with electron capture detection. The results indicate that surface waters of the northwest Atlantic are a source of ... -
Methodological Underestimation of Oceanic Nitrogen Fixation Rates
(2010-09)The two commonly applied methods to assess dinitrogen (N(2)) fixation rates are the (15)N(2)-tracer addition and the acetylene reduction assay (ARA). Discrepancies between the two methods as well as inconsistencies between ... -
Methyl iodide distribution in the ocean and fluxes to the atmosphere
(1999-05)Methyl iodide concentrations have been measured in air samples, surface, and subsurface waters of the NW Atlantic, NE Atlantic, and Pacific Oceans. They are shown to be substantially oversaturated in all surface waters. ... -
Methyl iodide in the NW Atlantic: Spatial and seasonal variation
(2009-07)While the global ocean is an important source of atmospheric methyl iodide (CH(3)I), the major producers of CH(3)I within the ocean remain unclear. During a seasonal study in the NW Atlantic, the relationship between CH(3)I ... -
Methyl iodide in the NW Atlantic; spatial and seasonal variation
(American Geophysical Union, Washington, DC, 2009)While the global ocean is an important source of atmospheric methyl iodide (CH (sub 3) I), the major producers of CH (sub 3) I within the ocean remain unclear. During a seasonal study in the NW Atlantic, the relationship ... -
Methyl-Chloride (Ch3cl) Production in Phytoplankton Cultures
(1995-01)Unialgal nonaxenic cultures of seven species of phytoplankton, including both warm- and cold-water organisms, were examined under halocarbon-clean conditions for the production of CH3Cl. Incubations of all species showed ... -
Mixed-stock analysis of Atlantic cod near the Gulf of St. Lawrence based on microsatellite DNA
(2000-08)The collapse of various stock complexes of cod (Gadus morhua) in the northwest Atlantic has prompted a clarification of relationships among stock components. Here we examine the genetic composition of >2300 cod collected ... -
A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation
(American Geophys. Union, 1998-12/15)The circulation on Western Bank is described using data collected in spring 1991 and 1992 as part of an interdisciplinary study of the early life history of Atlantic cod (Gadus morhua). The mean circulation over the crest ... -
Modeling events of sea-surface variability using spectral nudging in an eddy permitting model of the northeast Pacific Ocean
(2006-06)[ 1] Eddies are an important part of the current system that hugs the coasts of British Columbia and Alaska. The ability of "spectral nudging'' to improve the eddy statistics determined from model simulations of this current ... -
Modeling the effects of ultraviolet radiation on embryos of Calanus finmarchicus and Atlantic cod (Gadus morhua) in a mixing environment
(2000-12)It is well established that ultraviolet radiation (UVR, 280-400 nm) harms aquatic organisms. Reductions in productivity have been reported for phytoplankton, ichthyoplankton, and zooplankton in incubations exposed to UVR. ... -
A modified galerkin-spectral model for three-dimensional, barotropic, wind-driven shelf circulation
(1993)The authors describe an efficient numerical scheme for calculating wind-driven currents on the continental shelf. Our scheme is based on the spectral approach introduced by Heaps and subsequently modified by Lardner. The ... -
Natural emissions of chlorine-containing gases: Reactive Chlorine Emissions Inventory
(1999-04)Although there are many chlorine-containing trace gases in the atmosphere, only those with atmospheric lifetimes of 2 years or fewer appear to have significant natural sources. The most abundant of these gases are methyl ... -
New algorithms for MODIS sun-induced chlorophyll fluorescence and a comparison with present data products
(2005-02)We discuss important sources of variability in sun-induced chlorophyll fluorescence and examine difficulties in deriving fluorescence data products from satellite imagery, with a focus on the MODerate-resolution Imaging ... -
A new measurement of CO sub(2) eddy flux in the nearshore atmospheric surface layer
(1991)Fluxes of CO sub(2) in the atmospheric surface layer have been measured at a shoreline site by the eddy correlation method using a new CO sub(2) sensor with greater sensitivity than the ones used in earlier studies. In ...