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.
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Research Keywords
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Projects
Recent Publications
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
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
Extent and Causes of Chesapeake Bay Warming
Hinson, K. E., Friedrichs, M. A. M., St-Laurent, P., Da, F. & Najjar, R. G., Dec 2022, In: Journal of the American Water Resources Association. 58, 6, p. 805-825 21 p.Research output: Contribution to journal › Article › peer-review
The land-to-ocean loops of the global carbon cycle
Regnier, P., Resplandy, L., Najjar, R. G. & Ciais, P., Mar 17 2022, In: Nature. 603, 7901, p. 401-410 10 p.Research output: Contribution to journal › Review article › peer-review
Estimating estuarine primary production using satellite data and machine learning
Xu, M., Hu, C., Najjar, R. G., Herrmann, M., Briceno, H., Barnes, B. B., Roger Johansson, J. O. & English, D., Jun 2022, In: International Journal of Applied Earth Observation and Geoinformation. 110, 102821.Research output: Contribution to journal › Article › peer-review
Mechanisms Driving Decadal Changes in the Carbonate System of a Coastal Plain Estuary
Da, F., Friedrichs, M. A. M., St-Laurent, P., Shadwick, E. H., Najjar, R. G. & Hinson, K. E., Jun 2021, In: Journal of Geophysical Research: Oceans. 126, 6, e2021JC017239.Research output: Contribution to journal › Article › peer-review