1,721,045 research outputs found
RRS Discovery Cruise 132, 27 January - 20 February 1983. Physical oceanography of the upper ocean in winter in the eastern Atlantic Ocean in the region 38-48N, 10-21W
Full text linkRRS Discovery Cruise 164, 19 December 1986 - 21 January 1987. SeaSoar and CTD sections in the southwest Indian and Southern Oceans from 22S to 52S
Full text linkCTD data from the northeast Atlantic Ocean 40 - 48N, 12 - 21W, collected on RRS "Discovery" Cruise 132 in February 1983
Full text linkRRS Discovery Cruise 145, 25 February - 24 March 1984. The structure of the upper ocean at the end of winter in the region 40-47N, 13-16W
Full text linkRRS Discovery Cruise 181, 1 April - 3 May 1989. Circulation and structure of the Bay of Biscay and north east Atlantic out to 20W and 41N
Full text linkRRS "Discovery" Cruise 98, 27 December 1978 - 10 January 1979. Recife to Cape Town section
Full text linkLarge-scale circulation around the Crozet Plateau controls an annual phytoplankton bloom in the Crozet Basin
No full textThe circulation in the vicinity of the Crozet Plateau in the Southwest Indian Ocean sector of the Southern Ocean is examined using hydrographic sections, Argo floats, surface drifters, and satellite altimetry. All four techniques confirm that a major branch of the Antarctic Circumpolar Current, the SubAntarctic Front (SAF), flows anticyclonically round the Del Caño Rise west of the Crozet Plateau, i.e. eastward to the south of the Del Caño Rise, then northward and sometimes northwestward into the Crozet Basin, before turning back eastward in a combined front with the Agulhas Return Current and the SubTropical Front. This S-bend in the SAF is a permanent feature, controlled by the bathymetry, as has been inferred previously by Pollard and Read [Pollard, R.T., Read, J.F., 2001. Circulation pathways and transports of the Southern Ocean in the vicinity of the Southwest Indian Ridge. Journal of Geophysical Research, 106(C2), 2881–2898]. Similar, but much weaker, anticyclonic flow is found round the Crozet Plateau itself, with no more than 5?10×106 m3 s?1 turning north to the east of the Crozet Islands. Circulation north of the Crozet Plateau, between the Plateau and the S-bend of the SAF, is extremely weak, fed only by anticyclonic meanders breaking off the SAF into the area from the west or north, and occasional input from the northward, partially wind-driven (i.e. Ekman) flow south and east of the islands. In consequence of the weak circulation, dissolved iron from the land or sediments of the Crozet Plateau and Islands can build up during the winter in the Polar Frontal Zone between Crozet and the SAF, which gives rise to an annual bloom in this area. Biological evidence from satellite images, and from phytoplankton and zooplankton distributions, supports the circulation pattern we develop. This pattern confirms that patchiness of productivity in the bloom area results from close juxtaposition of water that has entered the area from the west from the SAF and from the south and east after flowing past the islands. Flow from the south and east has had a chance to entrain iron from the islands and sediments whereas flow from the west has not
RRS Discovery Cruise 213, 06 Jan-21 Feb 1995. South West Indian Ocean Experiment (SWINDEX)
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RRS Discovery Cruise 223, 28 Sep-19 Nov 1996. VIVALDI ‘96
Full text linkRRS Discovery Cruise 223, VIVALDI ‘96, was a contribution to the UK WOCE Community Research Programme. The pattern of SeaSoar sections was designed to enable the upper ocean circulation in the Subpolar gyre of the North Atlantic to be mapped and in particular the course of the North Atlantic and Irminger Currents within the region to be determined. The sparse deep CTD survey was required to complement the upper ocean survey and provide estimates of total mass transport and an ‘oceanographic opinion poll’ of water mass properties, including CFCs.The cruise commenced by repeating the well-established Rockall Trough CTD Section from Barra Head to Rockall Island. This was then extended north to Lousy Bank from where a CTD section measured before by Saunders across the Iceland Basin was repeated. From then onwards the cruise consisted principally of SeaSoar/ADCP sections interspersed with deep CTD casts (see track plot, Fig.1). These were placed on the ‘Vivaldi Grid’ (round 3° of latitude and multiples of 300 km west of 20°W) where possible, though the complex topography was taken into account. East of Greenland a more intense CTD section of 6 stations (12995-13001) was made along 60°N to cut the East Greenland Current. In addition 7 profiling floats were deployed in the Irminger Basin
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