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Raymond G. Najjar, Jr.

Raymond G. Najjar, Jr.

  • Professor of Oceanography
  • Joint Appointment with the Department of Geosciences
522 Walker Building
University Park, PA 16802
Email: rgn1@psu.edu
Phone: (814) 863-1586

Education:

  1. B.E., Mechanical Engineering, The Cooper Union for the Advancement of Art & Science
  2. 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.  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.

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.  Current research projects are focused on the carbon budget of tidal wetlands and estuaries of the contiguous United States, the impact of nitrogen deposition on coastal waters of the Eastern United States, and the combined influence of climate variability and land-use change on the ecology and biogeochemistry of the Chesapeake Bay, Delaware Bay, and the Mid-Atlantic Bight.

Biography:

  • Co-Chair Science Steering Group of North American Carbon Program
  • Member (alternate) Science and Technical Advisory Committee of the Chesapeake Bay Program

Selected courses taught

Selected recent publications

Click here for full publication list

Herrmann, M., Najjar, R.G., Kemp, W.M., McCallister, S.L., Alexander, R.B., Cai, W.-J., Griffith, P., Smith, R.A., 2015. Net ecosystem production and organic carbon balance of U.S. East Coast estuaries.  Global Biogeochemical Cycles, in press.

Schulte, J., Duffy, C., Najjar, R.G., 2015. Geometric and topological approaches to significance testing in wavelet analysis. Nonlinear Processes in Geophysics, 22, 139-156.

Ross, A.C., Najjar, R.G., Li, M., Mann, M.E., Ford, S.E., Katz, B., 2015. Sea-level rise and other influences on decadal-scale variations of salinity in a coastal plain estuary. Estuarine Coastal and Shelf Science, 157, 79-92.

Bannon, P.R., Najjar, R.G., 2014. Available energy of the world ocean. Journal of Marine Research, 72, 219-242.

Kim, T.W., Najjar, R.G., Lee, K., 2014. Influence of precipitation events on phytoplankton biomass in coastal waters of the eastern United States. Global Biogeochemical Cycles 28, doi:10.1002/2013GB004712, 1-13.

Signorini, S., Mannino, A., Friedrichs, M.A.M., Najjar, R.G., Cai, W.-J., Salisbury, J.E., Wang, Z.A., Thomas, H., Shadwick, E., 2013. Surface ocean pCO2 seasonality and sea-air CO2 flux estimates for the North American east coast. Journal of Geophysical Research, 118, 5439–5460.

Kim, T.-W., Lee, K., Najjar, R.G., Jeong, H.-D., Jeong, H.J., 2011. Increasing N abundance in the Northwestern Pacific Ocean due to atmospheric nitrogen deposition. Science, 334, 505-509.

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.

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.

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.

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.