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Raymond G. Najjar, Jr.
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Raymond G. Najjar, Jr.

  • Professor of Oceanography
  • Joint Appointment with the Department of Geosciences
522 Walker Building
University Park, PA 16802
Phone: (814) 863-1586

Education:

  1. B.E., Mechanical Engineering, The Cooper Union for the Advancement of Art & Science
  2. M.A., Geophysical Fluid Dynamics, Princeton University
  3. Ph.D., Atmosphere and Ocean Science, Princeton University

Research Specialties:

Climate:

Most of my work that directly involves climate is about the impact of climate change on coastal regions, especially estuaries of the Mid-Atlantic Region of the U.S.  A recent study is a literature review that focuses on climate change impacts on the Chesapeake Bay.  I am particularly interested in how climate change, through changing streamflow patterns, and sea-level rise, alters the salinity of estuaries.  I've also become interested in evaluating the skill of global climate models at regional scales, which is highlighted in two recent studies:  one is about watersheds of the Mid-Atlantic and the other is part of an assessment of climate change impacts on Pennsylvania.

Oceanography:
Most of my oceanographic research has been in the field of marine biogeochemistry, with a particular focus on dissolved gases, like carbon dioxide, oxygen, carbon monoxide, carbonyl sulfide and dimethyl sulfide.  A current activity in this area is my involvement in the USECoS project, which, through modeling, data analysis, and field observations, is focused on the carbon cycle of the continental shelf of the Eastern U.S.

Biography:

  • Member of the Graduate Faculty
  • Earth System Science Center Faculty
  • Member Science and Technical Advisory Committee of the Chesapeake Bay Program

Recently taught courses

Recent publications

(Click here for full list)

Najjar, R. G., C. R. Pyke, M. B. Adams, D. Breitburg, M. Kemp, C. Hershner, R. Howarth, M. Mulholland, M. Paolisso, D. Secor, K. Sellner, D. Wardrop, and R. Wood. 2010.  Potential climate-change impacts on the Chesapeake Bay. Estuarine, Coastal, and Shelf Science, 86, 1-20.

Shorr, N., A. Amato, S. Graham, and R. Najjar. 2009. Household heating and cooling energy use in the northeast USA: comparing the effects of climate change with those of purposive behaviors. Climate Research, 39, 1-20.

Najjar, R. G., L. Patterson and S. Graham. 2009. Climate simulations of major estuarine watersheds in the Mid-Atlantic region of the United States. Climatic Change, 95, 139-168.

Wu, S.-Y., R. G. Najjar, and J. Siewert. 2009. Potential impacts of sea-level rise on the Mid- and Upper-Atlantic Region of the United States. Climatic Change, 95,121-138.

Fennel, K., J. Wilkin, M. Previdi, and R. Najjar. 2008. Denitrification effects on air-sea CO2 flux in the coastal ocean: Simulations for the northwest North Atlantic. Geophysical Research Letters, 35, L24608, doi: 10.1029/2008GL036147.

Hilton, T. H., R. G. Najjar, L. Zhong, and M Li. 2008. Is there a signal of sea-level rise in Chesapeake Bay salinity? Journal of Geophysical Research., 113, C09002, doi: 10.1029/2007JC00427.

Bailey, K. E., D. A. Toole, B. Blomquist, R. G. Najjar, B. Huebert, D. J. Kieber, R. P. Kiene, P. Matrai, G. R. Westby, and D. A. del Valle. 2008. Dimethylsulfide production in Sargasso Sea eddies. Deep-Sea Research II, 55, 1491-1504.

Gabric, A. J., P. Matrai, R. Cropp, J. Dacey, J. DiTullio, D. J. Kieber, R. P. Kiene, R. G. Najjar, R. Simó, and D. A. Toole. 2008. Factors determining the vertical profile of dimethylsulfide in the Sargasso Sea during summer. Deep-Sea Research II, 55, 1505-1518.

Hoffman, E., J.-N. Druon, K. Fennel, M. Friedrichs, D. Haidvogel, C. Lee, A. Mannino, C. McClain, R. Najjar, J. O'Reilly, D. Pollard, M. Previdi, S. Seitzinger, J. Siewert, S. Signorini, and J. Wilkin. 2008. Eastern US continental shelf carbon budget: Integrating models, data assimilation, and analysis. Oceanography, 21(1), 86-104.

Zafiriou, O. C., H. Xie, N. B. Nelson, and R. G. Najjar. 2008. Carbon monoxide distributions reveal upper-ocean diel- and seasonal-scale photochemistry, biogeochemistry and mixing. Limnology and Oceanography, 53, 835-850.

Najjar, R. G., and 22 others. 2007. Impact of circulation on export production, dissolved organic matter and dissolved oxygen in the ocean: Results from Phase II of the Ocean Carbon-cycle Model Intercomparison Project (OCMIP-2), Global Biogeochemical Cycles, 21, GB3007, doi:10.1029/2006GB00285.

Berelson, W. M., W. M. Balch, R. Najjar, R. A. Feely, C. Sabine, K. Lee. 2007. Relating estimates of CaCO3 production, export, and dissolution in the water column to measurements of CaCO3 rain into sediment traps and dissolution on the sea floor: A revised global carbonate budget. Global Biogeochem. Cycles, 21, GB1024, doi: 10.1029/2006GB002803.

Jin, X., R. G. Najjar, F. Louanchi, and S. C. Doney. 2007. A modeling study of the seasonal oxygen budget of the global ocean. Journal of Geophysical Research, 112, C05017, doi:10.1029/2006JC003731.