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Full-Text Articles in Life Sciences
A Regional Modeling Study Of The Entraining Mediterranean Outflow, Xiaobiao Xu, E. P. Chassignet, J. F. Price, T. M. Özgökmen, H. Peters
A Regional Modeling Study Of The Entraining Mediterranean Outflow, Xiaobiao Xu, E. P. Chassignet, J. F. Price, T. M. Özgökmen, H. Peters
Faculty Publications
[1] We have evaluated a regional-scale simulation of the Mediterranean outflow by comparison with field data obtained in the 1988 Gulf of Cadiz Expedition. Our ocean model is based upon the Hybrid Coordinate Ocean Model (HYCOM) and includes the Richardson number-dependent entrainment parameterization of Xu et al. (2006). Given realistic topography and sufficient resolution, the model reproduces naturally the major, observed features of the Mediterranean outflow in the Gulf of Cadiz: the downstream evolution of temperature, salinity, and velocity profiles, the mean path and the spreading of the outflow plume, and most importantly, the localized, strong entrainment that has been …
Variability In The Bulk Composition And Abundance Of Dissolved Organic Matter In The Lower Mississippi And Pearl Rivers, Shuiwang Duan, Thomas S. Bianchi, Alan M. Shiller, Karl Dria, Patrick G. Hatcher, Kevin R. Carman
Variability In The Bulk Composition And Abundance Of Dissolved Organic Matter In The Lower Mississippi And Pearl Rivers, Shuiwang Duan, Thomas S. Bianchi, Alan M. Shiller, Karl Dria, Patrick G. Hatcher, Kevin R. Carman
Faculty Publications
[1] In this study, we examined the temporal and spatial variability of dissolved organic matter (DOM) abundance and composition in the lower Mississippi and Pearl rivers and effects of human and natural influences. In particular, we looked at bulk C/N ratio, stable isotopes (delta N-15 and delta C-13) and C-13 nuclear magnetic resonance (NMR) spectrometry of high molecular weight (HMW; 0.2 mu m to 1 kDa) DOM. Monthly water samples were collected at one station in each river from August 2001 to 2003. Surveys of spatial variability of total dissolved organic carbon (DOC) and nitrogen ( DON) were also conducted …
Revision Of The Nonequilibrium Thermal Dissociation And Stringent Washing Approaches For Identification Of Mixed Nucleic Acid Targets By Microarrays, Alex E. Pozhitkov, Robert D. Stedtfeld, Syed A. Hashsham, Peter A. Noble
Revision Of The Nonequilibrium Thermal Dissociation And Stringent Washing Approaches For Identification Of Mixed Nucleic Acid Targets By Microarrays, Alex E. Pozhitkov, Robert D. Stedtfeld, Syed A. Hashsham, Peter A. Noble
Faculty Publications
Microarray experiments typically involve washing steps that remove hybridized nonspecific targets with the purpose of improving the signal- to- noise ratio. The quality of washing ultimately affects downstream analysis of the microarray and interpretation. The paucity of fundamental studies directed towards understanding the dissociation of mixed targets from microarrays makes the development of meaningful washing/ dissociation protocols difficult. To fill the void, we examined activation energies and preexponential coefficients of 47 perfect match ( PM) and double- mismatch ( MM) duplex pairs to discover that there was no statistical difference between the kinetics of the PM and MM duplexes. Based …
Upper-Ocean Response To Hurricane Ivan In A 1/25 Degrees Nested Gulf Of Mexico Hycom, T. G. Prasad, Patrick J. Hogan
Upper-Ocean Response To Hurricane Ivan In A 1/25 Degrees Nested Gulf Of Mexico Hycom, T. G. Prasad, Patrick J. Hogan
Faculty Publications
[ 1] A 20-layer, 1/25 degrees nested Gulf of Mexico (GoM) Hybrid Coordinate Ocean Model (HYCOM) has been employed to examine the evolving three-dimensional ocean response to Hurricane Ivan during 14 - 16 September 2004. Results from several combinations of numerical experiments with and without assimilation of satellite-altimetry sea-surface height (SSH) are being analyzed and compared for the September 2004 hurricane period. A comparison of simulated zonal and meridional velocities using data assimilation shows improved agreement with profiler observations. The amplitude of the cold wake ( similar to 6 degrees C) produced by these simulations compared reasonably well with the …
Investigation Of The Summer Kara Sea Circulation Employing A Variational Data Assimilation Technique, G. Panteleev, A. Proshutinsky, M. Kulakov, Dmitri A. Nechaev, W. Maslowski
Investigation Of The Summer Kara Sea Circulation Employing A Variational Data Assimilation Technique, G. Panteleev, A. Proshutinsky, M. Kulakov, Dmitri A. Nechaev, W. Maslowski
Faculty Publications
[ 1] The summer circulations and hydrographic fields of the Kara Sea are reconstructed for mean, positive and negative Arctic Oscillation regimes employing a variational data assimilation technique which provides the best fit of reconstructed fields to climatological data and satisfies dynamical and kinematic constraints of a quasi-stationary primitive equation ocean circulation model. The reconstructed circulations agree well with the measurements and are characterized by inflow of 0.63, 0.8, 0.51 Sv through Kara Gate and 1.18, 1.1, 1.12 Sv between Novaya Zemlya and Franz Josef Land, for mean climatologic conditions, positive and negative AO indexes, respectively. The major regions of …
First Record Of A Sleeper Shark In The Western Gulf Of Mexico And Comments On Taxonomic Uncertainty Within Somniosus (Somniosus), George W. Benz, Eric R. Hoffmayer, William B. Driggers, Dan Allen, Lougan E. Bishop, David A. Brown
First Record Of A Sleeper Shark In The Western Gulf Of Mexico And Comments On Taxonomic Uncertainty Within Somniosus (Somniosus), George W. Benz, Eric R. Hoffmayer, William B. Driggers, Dan Allen, Lougan E. Bishop, David A. Brown
Faculty Publications
A sleeper shark, Somniosus (Somniosus) sp., is reported from Alaminos Canyon in the western Gulf of Mexico at a depth of about 2647 m based on observations made using a remotely operated vehicle. This is the first record of a sleeper shark (Somniosus, Somniosidae) from the western Gulf of Mexico and deepest record of any shark from the Gulf of Mexico. Despite claims to the contrary in the literature, no taxonomic character has been identified to date that can be used to unequivocally identify all representatives of Somniosus (Somniosus), and as a result, some species records must be considered dubious.
Grass Shrimp (Palaemonetes Spp.) Play A Pivotal Trophic Role In Enhancing Ruppia Maritima, Donna Drury Mccall, Chet R. Rakocinski
Grass Shrimp (Palaemonetes Spp.) Play A Pivotal Trophic Role In Enhancing Ruppia Maritima, Donna Drury Mccall, Chet R. Rakocinski
Faculty Publications
Coupled trophic-engineer interactions are potentially important for maintaining habitat function and ecosystem services. As ephemeral submerged aquatic vegetation (SAV), Ruppia maritima has a short well-defined growth-senescence cycle and should benefit from any ecological interaction that enhances its physical condition and longevity. Grass shrimp (Palaemonetes spp.) are abundant facultative grazers of epiphytic algae and conveyors of nutrients in tidal marsh and SAV habitats. Grass shrimp addition consistently enhanced Ruppia biomass and shoot density in a series of three field experiments conducted in Grand Bay National Estuarine Research Reserve, Mississippi, USA. In two experiments, epiphyte grazing by grass shrimp enhanced Ruppia by …