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Full-Text Articles in Life Sciences
The Phytoplankton Bloom In The Northwestern Arabian Sea During The Southwest Monsoon Of 1979, John C. Brock, Charles R. Mcclain, Mark E. Luther, William W. Hay
The Phytoplankton Bloom In The Northwestern Arabian Sea During The Southwest Monsoon Of 1979, John C. Brock, Charles R. Mcclain, Mark E. Luther, William W. Hay
Marine Science Faculty Publications
The biological variability of the northwestern Arabian Sea during the 1979 southwest monsoon has been investigated by the synthesis of satellite ocean color remote sensing with analysis of in situ hydrographic and meteorological data sets and the results of wind-driven modeling of upper ocean circulation. The phytoplankton bloom in the northwestern Arabian Sea peaked during August-September, extended from the Oman coast to about 65-degrees-E, and lagged the development of open-sea upwelling by at least 1 month. In total, the pigment distributions, hydrographic data, and model results all suggest that the bloom was driven by spatially distinct upward nutrient fluxes to …
Reflectance Model For Quantifying Chlorophyll-A In The Presence Of Productivity Degradation Products, Kendall L. Carder, S. K. Hawes, K. A. Baker, R. C. Smith, R. G. Steward, B. G. Mitchell
Reflectance Model For Quantifying Chlorophyll-A In The Presence Of Productivity Degradation Products, Kendall L. Carder, S. K. Hawes, K. A. Baker, R. C. Smith, R. G. Steward, B. G. Mitchell
Marine Science Faculty Publications
Marine colored dissolved organic matter (CDOM) (also gilvin or yellow substance) absorbs light at an exponentially decreasing rate as a function of wavelength. From 410 nm to about 640 nm, particulate phytoplankton degradation products including pheopigments, detritus, and bacteria have absorption curves that are similar in shape to that of CDOM. In coastal areas and areas downstream from upwelling regions, these constituents of seawater often absorb much more light than do living phytoplankton, leading to errors in satellite-derived chlorophyll estimates as high as 133%. Proposed NASA sensors for the 1990s will have spectral channels as low as 412 nm, permitting …
15N/14N And 13C/12C In Weddell Sea Invertebrates: Implications For Feeding Diversity, Greg H. Rau, Thomas L. Hopkins, Joseph J. Torres
15N/14N And 13C/12C In Weddell Sea Invertebrates: Implications For Feeding Diversity, Greg H. Rau, Thomas L. Hopkins, Joseph J. Torres
Marine Science Faculty Publications
Biomass delta-C-13, delta-N-15, and C/N were measured for each of 29 taxa of pelagic invertebrates sampled from the Weddell Sea in March 1986. The delta-C-13 values of these animals ranged from -33.2 to -23.9 parts per thousand, and a significant negative logarithmic relationship was observed between these values and biomass C/N. This implies that the relative proportion of carbon-rich C-13-depleted lipid in these animals significantly influenced the delta-C-13 of their bulk biomass. No such relationship with C/N is evident with respect to biomass delta-N-15 where values ranged from -1.2 to +7.3 parts per thousand. This spread of values reflects a …
On The Seasonal Phytoplankton Concentration And Sea Surface Temperature Cycles Of The Gulf Of Mexico As Determined By Satellites, Frank E. Muller-Karger, John J. Walsh, Robert H. Evans, Mark B. Meyers
On The Seasonal Phytoplankton Concentration And Sea Surface Temperature Cycles Of The Gulf Of Mexico As Determined By Satellites, Frank E. Muller-Karger, John J. Walsh, Robert H. Evans, Mark B. Meyers
Marine Science Faculty Publications
Monthly climatologies of near‐surface phytoplankton pigment concentration and sea surface temperature (SST) were derived for the Gulf of Mexico from multiyear series of coastal zone color scanner (CZCS) (November 1978 to November 1985) and advanced very high resolution radiometer (AVHRR) (January 1983 to December 1987) images. We complement these series with SST from the comprehensive ocean‐atmosphere data set (1946–1987) and Climate Analysis Center (1982–1990), and hydrographic profile data from the NOAA National Oceanographic Data Center (1914–1985). The CZCS ocean color satellite data provide the first climatological time series of phytoplankton concentration for the region. The CZCS images show that seasonal …
A Description Of The Annual Cycle In Sea Surface Temperature And Upper Ocean Heat In The Equatorial Atlantic, Thomas J. Weingartner, Robert H. Weisberg
A Description Of The Annual Cycle In Sea Surface Temperature And Upper Ocean Heat In The Equatorial Atlantic, Thomas J. Weingartner, Robert H. Weisberg
Marine Science Faculty Publications
Temperature and velocity time series, obtained by surface moorings during the Seasonal Response of the Equatorial Atlantic Experiment, are used to investigate the role of ocean dynamics upon the annual cycle of equatorial sea surface temperature (SST) and upper ocean heat. The annual cycle in SST is explained by different mechanisms, each operant at different phases of the cycle. The boreal springtime decrease in SST results from upwelling in response to the seasonal intensification of easterly wind stress. This upwelling causes the seasonal formation of the cold tongue along the equator in the central and eastern portions of the basin. …
Tectonic Evolution Of The Easter Microplate, David F. Naar, R. N. Hey
Tectonic Evolution Of The Easter Microplate, David F. Naar, R. N. Hey
Marine Science Faculty Publications
The plate tectonic history of the Easter microplate has been reconstructed by “closing” the microplate in a series of steps using the Pacific-Nazca magnetic anomalies north and south of the microplate and the NUVEL 1 global plate motion model. After each step, the Easter microplate was rotated rigidly to match the Nazca and Pacific anomalies. Gaps and overlaps formed by this kinematic treatment indicate compressional and tensional deformation, respectively, and show that rigid plate motions are insufficient to explain the complete tectonic evolution. Analysis of the magnetic anomaly data was guided by contoured SeaMARC II, Sea Beam, and 3.5-kHz bathymetry …
On The Annual Cycle Of Equatorial Upwelling In The Central Atlantic-Ocean, Thomas J. Weingartner, Robert H. Weisberg
On The Annual Cycle Of Equatorial Upwelling In The Central Atlantic-Ocean, Thomas J. Weingartner, Robert H. Weisberg
Marine Science Faculty Publications
The annual cycle of the upper ocean's vertical velocity component (w) on the equator at 28°W is examined by integrating the continuity equation using current meter data from the Seasonal Response of the Equatorial Atlantic Experiment. The annual cycle consists in part of an intense, but brief (∼1 month), upwelling season beginning with the onset of strong easterly wind stress in boreal spring. This upwelling is followed by weaker downwelling during the summer despite the persistence of strong easterly wind stress. The record-length averaged w profile shows that maximum upwelling (0.6 x 10-3cm s-1) …
The Seasonal Circulation Of The Upper Ocean In The Bay Of Bengal, James T. Potemra, Mark E. Luther
The Seasonal Circulation Of The Upper Ocean In The Bay Of Bengal, James T. Potemra, Mark E. Luther
Marine Science Faculty Publications
Analysis of the results of a multilayer, adiabatic, numerical model of the upper Indian Ocean, driven by climatological monthly mean winds, shows that the simulated currents in the northeastern Indian Ocean are in general agreement with available observations and interpretations. The main features of the ocean currents include large anticyclonic flow in the Bay of Bengal surface waters during the northern hemisphere winter. This gyre decays into eddies in spring and then transitions into a weaker, cyclonic gyre by late summer. The western recirculation region of this flow is an intensified western boundary current which changes direction twice during the …