Ocean Circulation Causes Strong Variability in the Mid-Atlantic Bight Nitrogen Budget

Marjorie A.M. Friedrichs, Pierre St-Laurent, Yongjin Xiao, Eileen Hofmann, Kimberly Hyde, Antonio Mannino, Raymond G. Najjar, Diego A. Narváez, Sergio R. Signorini, Hanqin Tian, John Wilkin, Yuanzhi Yao, Jianhong Xue

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Understanding of nitrogen cycling on continental shelves, a critical component of global nutrient cycling, is hampered by limited observations compared to the strong variability on a wide range of time and space scales. Numerical models have the potential to partially alleviate this issue by filling spatiotemporal data gaps and hence resolving annual area-integrated nutrient fluxes. In this study, a three-dimensional biogeochemical-circulation model was implemented to simulate the Mid-Atlantic Bight (MAB) nitrogen budget. Model results demonstrate that, on average, MAB net community production (NCP) was positive (+0.27 Tg N/year), indicating net autotrophy. Interannual variability in NCP was strong, with annual values ranging between 0.19 and 0.41 Tg N/year. Along-shelf and across-shelf horizontal transport fluxes were the other dominant terms in the nitrogen budget and were primarily responsible for this NCP variability. The along-shelf current transported nitrogen from the north (0.65 Tg N/year) into the MAB, supplementing the nitrogen entering from terrestrial inputs (0.27 Tg N/year). However, NCP was highest in the year when total water volume transport and inorganic nitrogen input was strongest across the continental slope in the southern MAB, rather than when terrestrial inputs were greatest. Interannual variability of NCP appears to be linked to changes in the positions of the Gulf Stream and Slope Water Gyre. Overall, the strong spatiotemporal variability of the nitrogen fluxes highlights the importance of observations throughout all seasons and multiple years in order to accurately resolve the current status and future changes of the MAB nitrogen budget.

Original languageEnglish (US)
Pages (from-to)113-134
Number of pages22
JournalJournal of Geophysical Research: Oceans
Volume124
Issue number1
DOIs
StatePublished - Jan 2019

Fingerprint

budgets
oceans
Nitrogen
nitrogen
causes
shelves
nutrients
Fluxes
Nutrients
autotrophy
Gulf Stream
volume transport
slopes
inorganic nitrogen
cycles
gyre
nutrient cycling
budget
ocean circulation
Water

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Friedrichs, M. A. M., St-Laurent, P., Xiao, Y., Hofmann, E., Hyde, K., Mannino, A., ... Xue, J. (2019). Ocean Circulation Causes Strong Variability in the Mid-Atlantic Bight Nitrogen Budget. Journal of Geophysical Research: Oceans, 124(1), 113-134. https://doi.org/10.1029/2018JC014424
Friedrichs, Marjorie A.M. ; St-Laurent, Pierre ; Xiao, Yongjin ; Hofmann, Eileen ; Hyde, Kimberly ; Mannino, Antonio ; Najjar, Raymond G. ; Narváez, Diego A. ; Signorini, Sergio R. ; Tian, Hanqin ; Wilkin, John ; Yao, Yuanzhi ; Xue, Jianhong. / Ocean Circulation Causes Strong Variability in the Mid-Atlantic Bight Nitrogen Budget. In: Journal of Geophysical Research: Oceans. 2019 ; Vol. 124, No. 1. pp. 113-134.
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Friedrichs, MAM, St-Laurent, P, Xiao, Y, Hofmann, E, Hyde, K, Mannino, A, Najjar, RG, Narváez, DA, Signorini, SR, Tian, H, Wilkin, J, Yao, Y & Xue, J 2019, 'Ocean Circulation Causes Strong Variability in the Mid-Atlantic Bight Nitrogen Budget', Journal of Geophysical Research: Oceans, vol. 124, no. 1, pp. 113-134. https://doi.org/10.1029/2018JC014424

Ocean Circulation Causes Strong Variability in the Mid-Atlantic Bight Nitrogen Budget. / Friedrichs, Marjorie A.M.; St-Laurent, Pierre; Xiao, Yongjin; Hofmann, Eileen; Hyde, Kimberly; Mannino, Antonio; Najjar, Raymond G.; Narváez, Diego A.; Signorini, Sergio R.; Tian, Hanqin; Wilkin, John; Yao, Yuanzhi; Xue, Jianhong.

In: Journal of Geophysical Research: Oceans, Vol. 124, No. 1, 01.2019, p. 113-134.

Research output: Contribution to journalArticle

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AU - Friedrichs, Marjorie A.M.

AU - St-Laurent, Pierre

AU - Xiao, Yongjin

AU - Hofmann, Eileen

AU - Hyde, Kimberly

AU - Mannino, Antonio

AU - Najjar, Raymond G.

AU - Narváez, Diego A.

AU - Signorini, Sergio R.

AU - Tian, Hanqin

AU - Wilkin, John

AU - Yao, Yuanzhi

AU - Xue, Jianhong

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