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- Title
A Numerical Model Analysis of the Mean and Seasonal Nitrogen Budget on the Northeast U.S. Shelf.
- Authors
Zhang, Shuwen; Curchitser, Enrique N.; Dussin, Raphael; Stock, Charles A.
- Abstract
The supply of nitrogen is a primary limiting factor for the productivity of the Northeast United States (NEUS) continental shelf. In this study, a 12‐year (1996–2007) retrospective physical‐biogeochemical simulation over the Northwest Atlantic was used to analyze the mean and seasonal NEUS shelf nitrogen budget, including the connections between shelf subregions: the Gulf of Maine/Georges Bank (GoM/GB), and the Mid‐Atlantic Bight (MAB). The model captures the primary mean and seasonal patterns of shelf circulation, nitrate, and plankton dynamics. Results confirm aspects of previous nitrogen budget analyses, including the dominance of offshore nitrogen influxes into the GoM/GB and the prominent role of riverine influxes and sedimentary denitrification in the MAB. However, detailed spatiotemporal analysis of nitrogen fluxes highlights the importance of dispersed inflows of shallow to intermediate depth waters (0–75 m), which can at times exceed the deep nitrogen influx emphasized in previous studies. A seasonal analysis shows a pronounced shift from the net import of nitrogen to the GoM/GB region during late fall and winter, to the net export of nitrogen from the region in the spring and early summer. The MAB, in contrast, consistently exports nitrogen to offshore waters. The prominence of the 0‐75m nitrogen supply has implications for the roles of Labrador Slope Water and Atlantic Temperate Slope Water on the NEUS ecosystems, as Atlantic Temperate Slope Water has greater nitrate concentrations than Labrador Slope Water at depth but often less at the surface. Results suggest the need for further study of shallow to intermediate depth inflows beyond those from the Scotian Shelf, particularly during the fall/winter of net nitrogen inflow. Key Points: A high‐resolution physical‐biogeochemical simulation of the Northwest Atlantic is used to analyze the NEUS shelf nitrogen budgetInflows from shallow to intermediate depths (0‐75 m) are important for the total nitrogen fluxes to the NEUS shelfSeasonal variations in advective exchanges with the open ocean lead to large seasonal changes in the NEUS shelf total nitrogen
- Subjects
NORTHEASTERN States; MID-Atlantic Bight; UNITED States; NITROGEN in water -- Seasonal variations; CONTINENTAL shelf; SPATIOTEMPORAL processes
- Publication
Journal of Geophysical Research. Oceans, 2019, Vol 124, Issue 5, p2969
- ISSN
2169-9275
- Publication type
Article
- DOI
10.1029/2018JC014308