Nitrate supply and demand at the Georges Bank tidal front
Horne, E.P.W.; Loder, J.W.; Harrison, W.G.; Mohn, R.; Lewis, M.R.; Irwin, B.; Platt, T. (1989). Nitrate supply and demand at the Georges Bank tidal front, in: Ros, J.D. (Ed.) Topics in Marine Biology: Proceedings of the 22nd European Marine Biology Symposium, Barcelona, Spain, August 1987. Scientia Marina (Barcelona), 53(2-3): pp. 145-158 In: Ros, J.D. (Ed.) (1989). Topics in marine biology: Proceedings of the 22nd European Marine Biology Symposium, Barcelona, Spain, August 1987. European Marine Biology Symposia, 22. Scientia Marina (Barcelona), 53(2-3). 145-754 pp., more In: European Marine Biology Symposia., more |
| Available in | Authors | | Document type: Conference paper
|
| Authors | | Top | - Horne, E.P.W.
- Loder, J.W.
- Harrison, W.G.
- Mohn, R.
| - Lewis, M.R.
- Irwin, B.
- Platt, T.
| |
| Abstract | New production, which uses NO3 as a nitrogen source, controls the net community production (or harvest) of an ecosystem. For Georges Bank the depth-integrated nitrate flux across its summertime tidal front is estimated from observations taken in July-August 1985 to be 12 mg at m-1s-1. Nutrient demand for the frontal (inside the nitrate-flux measurement site) and well-mixed areas of Georges Bank is found using the 15N technique to be 2.9 mg at N m-1s-1 and 2.5 mg at N m-1s-1, respectively. The measured flux is well in excess of that required to support the scallop population that exists near the frontal area. Additional measurements are required to determine the representativeness of the nutrient transfer and demand estimates, and to confirm the nutrient transfer mechanism(s). A leading candidate for the latter on the northern side of the Bank is the cross-frontal (Lagrangjan) residual circulation associated with nonlinear tidal current interactions. Part of the scalar transport by this circulation appears in Eulerian measurements as a "skew" eddy flux in the semidiurnal tidal band. |
|
