Research Summary
I conduct research on a variety of topics in oceanography, climate science, and hydrology, with current interests focused on how coastal waters are influenced by climate change and pollution.
In the News
Research Keywords
These keywords and phrases come from the publications and other research output of this person. See other researchers related to these topics by clicking on any keyword.
Projects
Recent Publications
Benthic macrofaunal carbon fluxes and environmental drivers of spatial variability in a large coastal-plain estuary
Ajayi, S., Najjar, R., Rivest, E., Woodland, R., Friedrichs, M. A. M., St-Laurent, P. & Davis, S., Dec 8 2025, In: Biogeosciences. 22, 23, p. 7769-7795 27 p.Research output: Contribution to journal › Article › peer-review
Ecosystem Metabolic Rates Estimated from Diel Oxygen Measurements in Two Subtropical Estuaries
Arriola, J. M., Najjar, R. G., Briceño, H., Hu, C., Herrmann, M. & Beck, M. W., Nov 2025, In: Estuaries and Coasts. 48, 6, 155.Research output: Contribution to journal › Article › peer-review
Microplastic polymer accumulation, distribution, and toxicity in sediment of a freshwater tidal marsh, USA
Bussarakum, J., Drohan, P. J., Najjar, R. G., Arriola, J. M., Emili, L. A. & Warner, N. R., Dec 2025, In: Marine pollution bulletin. 221, 118566.Research output: Contribution to journal › Article › peer-review
Freshwater faces a warmer and saltier future from headwaters to coasts: climate risks, saltwater intrusion, and biogeochemical chain reactions
Kaushal, S. S., Shelton, S. A., Mayer, P. M., Kellmayer, B., Utz, R. M., Reimer, J. E., Baljunas, J., Bhide, S. V., Mon, A., Rodriguez-Cardona, B. M., Grant, S. B., Newcomer-Johnson, T. A., Malin, J. T., Shatkay, R. R., Collison, D. C., Papageorgiou, K., Escobar, J., Rippy, M. A., Likens, G. E. & Najjar, R. G. & 4 others, , Apr 2025, In: Biogeochemistry. 168, 2, 31.Research output: Contribution to journal › Article › peer-review
The Emerging Global Threat of Salt Contamination of Water Supplies in Tidal Rivers
Li, M., Najjar, R. G., Kaushal, S., Mejia, A., Chant, R. J., Ralston, D. K., Burchard, H., Hadjimichael, A., Lassiter, A. & Wang, X., Aug 12 2025, In: Environmental Science and Technology Letters. 12, 8, p. 881-892 12 p.Research output: Contribution to journal › Review article › peer-review
Fitting metabolic models to dissolved oxygen data: The estuarine Bayesian single-station estimation method
Beck, M. W., Arriola, J. M., Herrmann, M. & Najjar, R. G., Aug 2024, In: Limnology and Oceanography: Methods. 22, 8, p. 590-607 18 p.Research output: Contribution to journal › Article › peer-review
Divergent responses of nitrogen-species loadings to future climate change in the Chesapeake Bay watershed
Bian, Z., Pan, S., Najjar, R. G., Friedrichs, M. A. M., Hofmann, E. E., Herrmann, M., Hinson, K. E., St-Laurent, P. & Tian, H., Dec 2024, In: Journal of Hydrology: Regional Studies. 56, 102060.Research output: Contribution to journal › Article › peer-review
Decadal changes in microplastic accumulation in freshwater sediments: Evaluating influencing factors
Bussarakum, J., Burgos, W. D., Cohen, S. B., Van Meter, K., Sweetman, J. N., Drohan, P. J., Najjar, R. G., Arriola, J. M., Pankratz, K., Emili, L. A. & Warner, N. R., Dec 1 2024, In: Science of the Total Environment. 954, 176619.Research output: Contribution to journal › Article › peer-review
Influence of Rivers, Tides, and Tidal Wetlands on Estuarine Carbonate System Dynamics
Da, F., Friedrichs, M. A. M., St-Laurent, P., Najjar, R. G., Shadwick, E. H. & Stets, E. G., Dec 2024, In: Estuaries and Coasts. 47, 8, p. 2283-2305 23 p.Research output: Contribution to journal › Article › peer-review
Response of hypoxia to future climate change is sensitive to methodological assumptions
Hinson, K. E., Friedrichs, M. A. M., Najjar, R. G., Bian, Z., Herrmann, M., St-Laurent, P. & Tian, H., Dec 2024, In: Scientific reports. 14, 1, 17544.Research output: Contribution to journal › Article › peer-review
A Synthesis of Global Coastal Ocean Greenhouse Gas Fluxes
Resplandy, L., Hogikyan, A., Müller, J. D., Najjar, R. G., Bange, H. W., Bianchi, D., Weber, T., Cai, W. J., Doney, S. C., Fennel, K., Gehlen, M., Hauck, J., Lacroix, F., Landschützer, P., Le Quéré, C., Roobaert, A., Schwinger, J., Berthet, S., Bopp, L. & Chau, T. T. T. & 15 others, , Jan 2024, In: Global Biogeochemical Cycles. 38, 1, e2023GB007803.Research output: Contribution to journal › Article › peer-review
Impacts and uncertainties of climate-induced changes in watershed inputs on estuarine hypoxia
Hinson, K. E., Friedrichs, M. A. M., Najjar, R. G., Herrmann, M., Bian, Z., Bhatt, G., St-Laurent, P., Tian, H. & Shenk, G., May 26 2023, In: Biogeosciences. 20, 10, p. 1937-1961 25 p.Research output: Contribution to journal › Article › peer-review
Coastal vegetation and estuaries are collectively a greenhouse gas sink
Rosentreter, J. A., Laruelle, G. G., Bange, H. W., Bianchi, T. S., Busecke, J. J. M., Cai, W. J., Eyre, B. D., Forbrich, I., Kwon, E. Y., Maavara, T., Moosdorf, N., Najjar, R. G., Sarma, V. V. S. S., Van Dam, B. & Regnier, P., Jun 2023, In: Nature Climate Change. 13, 6, p. 579-587 9 p.Research output: Contribution to journal › Article › peer-review
Decoupling of Estuarine Hypoxia and Acidification as Revealed by Historical Water Quality Data
Shen, C., Testa, J. M., Herrmann, M. & Najjar, R. G., Jan 10 2023, In: Environmental Science and Technology. 57, 1, p. 780-789 10 p.Research output: Contribution to journal › Article › peer-review
Increased Terrestrial Carbon Export and CO2 Evasion From Global Inland Waters Since the Preindustrial Era
Tian, H., Yao, Y., Li, Y., Shi, H., Pan, S., Najjar, R. G., Pan, N., Bian, Z., Ciais, P., Cai, W. J., Dai, M., Friedrichs, M. A. M., Li, H. Y., Lohrenz, S. & Leung, L. R., Oct 2023, In: Global Biogeochemical Cycles. 37, 10, e2023GB007776.Research output: Contribution to journal › Article › peer-review