Oceanic and shelf-seas circulation and structure

The study of marine physical processes and the impact on biological and chemical properties is one the main areas of NEODAAS supported science, typically with a process study cruise supported with near-real time data (e.g. Sharples et al., 2007; Sherwin et al., 2006) and/or post cruise analyses illustrated with reprocessed data (e.g. deCastro et al., 2006; Torres and Barton, 2006).

Torres and Barton (2006) used NEODAAS data to illustrate large scale hydrographic features off the Galician coast. Fig. 1a shows a weekly SST composite (31 October-6 November 1999) overlaid with top 100m vertically averaged currents measured during a cruise. On Fig. 1b a low chlorophyll-a tongue (in darker green) can be seen parallel to the west coast of Galicia failing to round Cape Finisterre on a SeaWiFS chl-a image for 8 November 1999.

SST and chl-a images off northwest Iberian coast

Figure 1: a) SST and b) chl-a images off northwest Iberian coast

Sharples, J., Tweddle, J.F., Green, J.A.M., Palmer, M.R., Kim, Y.N., Hickman, A.E., Holligan, P.M., Moore, C.M., Rippeth, T.P., Simpson, J.H. & Krivtsov, V. (2007) Spring-neap modulation of internal tide mixing and vertical nitrate fluxes at a shelf edge in summer. Limnology and Oceanography, 52(5), 1735-1747.

Sherwin, T.J., Williams, M.O., Turrell, W.R., Hughes, S.L. & Miller, P.I. (2006) A description and analysis of mesoscale variability in the Faroe-Shetland Channel. Journal of Geophysical Research-Oceans, 111(C3), C03003.

Torres, R. & Barton, E.D. (2006) Onset and development of the Iberian poleward flow along the Galician coast. Continental Shelf Research, 26(10), 1134-1153.