Lohrenz Bio-Ocean Website

      

Contact Information Curriculum Vitae Research Courses
Selected Publications Graduate Study in Marine Science Univ. of  Southern Mississippi Other Links

Contact Information:

Steven E. Lohrenz
Professor and Chair of Marine Science
Department of Marine Science
University of Southern Mississippi
1020 Balch Boulevard
Stennis Space Center, MS 39529-5001

Phone: 228-688-3177
Fax: 228-688-1121
Steven.lohrenz@usm.edu
     
Curriculum Vitae:    
    EDUCATION    
  • Ph.D., Biological Oceanography, Massachusetts Institute of Technology--Woods Hole Oceanographic Institution, 1985
  • B.A., Biology and Chemistry, University of Oregon (Eugene), 1978
     
Research    
  • Optical assessment of air-sea carbon fluxes in river-dominated margins
  • Optical detection and assessment of harmful algal blooms
  • Application of remote sensing, in situ optical measurements and models for description of primary production and phytoplankton distributions
  • Characterization of biogeochemical constituents and their effects on optical properties in aquatic environments
  • Fine-scale distributions of photosynthetic pigments and associated microbial biomass and activity
  • Production, transformation and transport of organic matter in coastal ecosystems
  • Microbial cycling of nutrients and dissolved organic matter
  • Interrelationships among biological and physical dynamics at oceanic frontal regions
  • Single-cell techniques for characterization of growth and photosynthetic processes in phytoplankton
  • Radioisotopic tracing of algal physiological state and biochemical composition
  • Protein and nucleic acid metabolism in unicellular algae

CLICK HERE TO SEE MORE ABOUT CURRENT RESEARCH PROJECTS

     
Courses    

This is an introduction to remote sensing theory and application. The course will initially cover the fundamental physics and definitions of remote sensing concepts. These fundamentals will allow a subsequent discussion of more advanced remote sensing technologies currently in use. The course will introduce the basic principals underpinning remote sensing technologies and cover the application of these concepts to different types of remote sensors and platforms.   

This course is intended as a comprehensive overview of marine science for undergraduates interested in satisfying their core science requirement.  

This course is intended as a comprehensive overview of estuarine processes including physics, chemistry, biology and the impact of human activities. The importance of individual processes in regulating estuarine properties will be illustrated through comparison of different ecosystems.

This is an upper level introduction to marine bio-optics. The course initially covers definitions and basic principles of optics, a toolbox if you will, that is required to discuss more advanced concepts. The first half of the course deals primarily with optics, and the second half covers the application of optics for the study of biological problems, i.e., bio-optics. 

This course explores current concepts in biological oceanography through a combination of lectures and discussions, relying on past and current scientific literature as a source of information.  Interactions between biological processes and physical, chemical and geochemical oceanography will be examined.

     
Selected Publications  

Lohrenz, S.E., Redalje, D.G., Cai, W.-J., Acker, J., Dagg, M.J., 2007. A Retrospective Analysis of Nutrients and Phytoplankton Productivity in the Mississippi River Plume. Continental Shelf Research, in press.

Cai, W.-J., Guo, X., Chen, C.-T.A., Dai, M., Zhang, L., Zhai, W., Lohrenz, S.E., Yin, K., Harrison, P.J., Wang, Y., 2007. A comparative overview of weathering intensity and HCO3- flux in the world’s major rivers with emphasis on the Changjiang, Huanghe, Zhujiang (Pearl) and Mississippi Rivers. Continental Shelf Research, in press.

Green, R.E., Breed, G.A., Dagg, M.J., Lohrenz, S.E., 2007. Modeling planktonic response to variable nitrate loading in the Mississippi River plume Continental Shelf Research, in press.

Lohrenz, S. E., and W. J. Cai (2006), Satellite ocean color assessment of air-sea fluxes of CO2 in a river-dominated coastal margin, Geophys. Res. Lett., 33, doi:10.1029/2005GL023942.

Lohrenz, S. E. and P. G. Verity, Regional Oceanography: Southeastern United States and Gulf of Mexico (2,W), In: The Sea, Vol. 13, The Global Coastal Ocean: Interdisciplinary Regional Studies And Syntheses (A. R. Robinson and K. H. Brink, Eds.), John Wiley & Sons, New York, in press (2006).

Craig, S.E., Lohrenz, S.E., Lee, Z.P., Kirkpatrick, G.J., Schofield, O.M., Steward, R.G. (2006). Use of hyperspectral remote sensing reflectance for detection and assessment of Karenia brevis blooms. Applied Optics, 45(21), 5414-5425.

Schofield, O., J. Kerfoot, K. Mahoney, M. Moline, M. Oliver, S. Lohrenz, G. Kirkpatrick (2006), Vertical migration of the toxic dinoflagellate Karenia brevis and the impact on ocean optical properties. Journal of Geophysical Research, Vol. 111, C06009, doi:10.1029/2005JC003115.

Lohrenz, S. E., G. L. Fahnenstiel, D. F. Millie, O. M. E. Schofield, T. Johengen, and T. Bergmann (2004), Spring phytoplankton photosynthesis, growth, and primary production and relationships to a recurrent coastal sediment plume and river inputs in southeastern Lake Michigan, J. Geophys. Res.-Oceans, 109, doi:10.1029/2004JC002383.

Bergmann, T., G. Fahnenstiel, S. Lohrenz, D. Millie, and O. Schofield (2004), Impacts of a recurrent resuspension event and variable phytoplankton community composition on remote sensing reflectance, J. Geophys. Res.-Oceans, 109, doi:10.1029/2002JC001575.

Lohrenz, S. E., Carroll, C. L., Weidemann, A. D. and Tuel, M. (2003) Variations in phytoplankton pigments, size structure and community composition related to wind forcing and water mass properties on the North Carolina inner shelf. Continental Shelf Research, 23, 1447-1464.

Lohrenz, Steven E., A. D. Weidemann, M. Tuel (2003) Relationships between phytoplankton spectral absorption and pigment composition in coastal waters,  Journal of Plankton Research, 22, 639-657.

Lohrenz, Steven E., (2003) Biological Oceanography, in Water: Science and Issues, edited by E.J. Dasch, pp. 157-159, Macmillan Reference USA, New York.

Millie, D. F., G. L. Fahnenstiel, Steven E. Lohrenz, H. J. Carrick, T. Johengen, and O. M. E. Schofield  (2003) Physical-biological coupling in southeastern Lake Michigan: Influence of episodic sediment resuspension on phytoplankton. Aquatic Ecology, 37, 393-408.

Lohrenz, Steven E., Donald G. Redalje, Peter G. Verity, Charles L. Flagg and Kenneth V. Matulewski, (2002) Primary production on the continental shelf off Cape Hatteras, North Carolina, Deep-Sea Research II, 49, 4479-4509. 

Donald G. Redalje, Steven E. Lohrenz, Peter G. Verity, and Charles L. Flagg, (2002) Phytoplankton dynamics within a discrete water mass off Cape Hatteras, North Carolina: The Lagrangian experiment, Deep-Sea Research II, 49, 4511-4531

Verity, Peter G., Redalje, D. G., Steven E. Lohrenz, and G. A. Paffenhofer, (2002) Coupling between primary production and pelagic consumption in temperate ocean margin pelagic ecosystems, Deep-Sea Research II, 49, 4553-4569.

Millie, David F., Gary L. Fahnenstiel, Hunter J. Carrick, Steven E. Lohrenz, Oscar M. E. Schofield, (2002) Phytoplankton pigments in coastal Lake Michigan: distributions during the spring isothermal period and relation with episodic sediment resuspension, Journal of Phycology, 38, 1-11.

D'Sa, E., Steven E. Lohrenz,  J. Churchill, J. Largier, S. Lentz, V. L. Asper, and A. E. Williams, III (2001) Pigment distributions and transport in inner shelf waters off Duck, NC, Journal of Geophysical Research, 106(C6), 11581-11596.

Chen, X, Steven E. Lohrenz and D. A. Wiesenburg, (2000) Distribution and controlling mechanisms of primary production over the Louisiana-Texas continental shelf, Journal of Marine Systems 25, 179-207.

Lohrenz, Steven E., (2000) A novel theoretical approach to correct for pathlength amplification and variable sample loading in measurements of particulate spectral absorption by the quantitative filter technique, Journal of Plankton Research, 22, 639-657.

Toon, R. K., Steven E. Lohrenz, C. E. Rathbun, A. M. Wood, R. A. Arnone, B. H. Jones, J. C. Kindle, and A. D. Weidemann, (2000) Photosynthesis-irradiance parameters and community structure associated with coastal filaments and adjacent waters in the northern Arabian Sea, Deep-Sea Research II, 47, 1249-1277.

Lohrenz, Steven E., G. L. Fahnenstiel, D. G. Redalje, G. A. Lang, M. J. Dagg, T. E. Whitledge, and Q. Dortch, (1999) The interplay of nutrients, irradiance, and mixing as factors regulating primary production in coastal waters impacted by the Mississippi River plume, Continental Shelf Research, 19, 1113-1141.

Lohrenz, Steven E., G. L. Fahnenstiel, D. G. Redalje, G. A. Lang, X. Chen and M. J. Dagg, (1997) Variations in primary production of northern Gulf of Mexico continental shelf waters linked to nutrient inputs from the Mississippi River, Marine Ecology Progress Series 155, 45-54.

Fahnenstiel, G. L., M. J. McCormick, D. G. Redalje, and Steven E. Lohrenz, (1996) Cell specific estimates of growth and productivity: a reclarification, Limnology and Oceanography, 41, 1, 182-189, American Society of Limnology and Oceanography, Lawrence, KS.

Lohrenz, Steven E., G. L. Fahnenstiel, and D. G. Redalje, (1994) Spatial and temporal variations of photosynthetic parameters in relation to environmental conditions in northern Gulf of Mexico coastal waters, Estuaries, 17, 779-795.

Lohrenz, Steven E., J. J. Cullen, D. A. Phinney, D. B. Olson and C. S. Yentsch, (1993) Distributions of pigments and primary production in a Gulf Stream meander, Journal of Geophysical Research, 98, 14,545-14,560.

Lohrenz, Steven E., (1993) The simulated in situ method for measurement of primary production, ICES Mar. Sci. Symp., 197, 159-171.

Lohrenz, Steven E., G. A. Knauer, V. L. Asper, A. H. Knap, and M. Tuel, (1992) Seasonal variability in primary production and particle flux in the northwestern Sargasso Sea, U. S. JGOFS Bermuda Atlantic Time Series Program, Deep-Sea Research, 39, 1373-1391.

     
 Other Links    

Marine Science Departmental Faculty

University of Southern Mississippi Home Page

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Last Modified: February 26, 2008 3:35 PM -> | http://www.usm.edu/marine | E-mail: marine.science@usm.edu | College of Science and Technology | The University of Southern Mississippi