1,138 research outputs found
Physical oceanography during POLARSTERN cruise ANT-XXI/3 (EIFEX)
No full textThe track of Polarstern Cruise ANTXXI/3-"EIFEX"- leaving from Cape Town on 21st January 2004 and arriving back in Cape Town on 25th March 2004. The purpose of this cruise was to conduct an iron fertilisation experiment in the ACC. The reason for using an eddy was that the water fertilised with iron sulphate would be trapped and relatively easy to follow. The first eddy (Eddy 1) selected on the basis of altimeter data was at about 50°S, 18°E. This eddy was surveyed during a period of 7 days between 25th January and 1st February 2004 by CTD/Rosette casts along five equally spaced meridional sections. Along the westernmost section, 17°E, the station spacing was 5 mi (9 km), and along the other 4 (17°40', 18°20', 19°00' and 19°40' E), it was 12 mi (22 km); the sections were completed systematically working from west to east. Investigation revealed that the initial chlorophyll concentration was too low for the fertilisation experiment and so this eddy was rejected, but not before a useful set of physical data had been obtained. Instead, a second eddy (Eddy 2), at about 49°S, 2°E was selected for the experiment and was ultimately occupied for a period of 40 days. Altogether, this eddy was investigated during the period 8th February to 20th March 2004; however, the data for the initial CTD/Rosette survey were collected during a period of 6 days between 14th and 20th February. The stations were evenly spaced 12 mi (22 km) apart meridionally and zonally, or 12' latitude and about 18.6' of longitude, with ten stations along each of eight equally spaced meridional sections between 1°19' and 3°29' E. The sections were collected systematically from west to east
Fluxes of nutrients in a three-dimensional meander structure of the Antarctic Polar Front
No full textThe horizontal and vertical advection and the vertical diffusion of two plant nutrients (nitrate and silicate) are estimated at the Antarctic Polar Front (APF) in the Atlantic sector using quasi-synoptic, high-resolution physical and chemical measurements. Our results suggest that the routes of nutrient supply are more complex than indicated by existing large-scale views. The vertical advection associated with mesoscale upwelling events is shown to be between two and three orders of magnitude larger than the diffusion, and to potentially amount to the phytoplankton uptake rate locally. Averaged over the survey area, however, the vertical nutrient transport is downward and concords with the front acting as a barrier to the northward export of surface nutrients by the Ekman drift. This poses significant constraints on the global cycles of nutrients and may have an impact in the sediment record
A new way to look at mesoscale zooplankton distributions: an application at the Antarctic Polar Front
No full textDuring the austral summer of 1996 an intensive multidisciplinary survey was carried out in the Antarctic Polar Front. In this paper, we examine the relationship between hydrographic features and the acoustic backscatter signal from a vessel-mounted acoustic Doppler current profiler. We introduce two new analysis methods: mapping of depth-integrated scattering cross section and a model of the vertical zooplankton distribution through idealised population dynamics. Three distinct layers are characterised by a different balance between diel migration behaviour and direct/indirect forcing by mesoscale physical processes in the ocean
Station list and links to master tracks in different resolutions of POLARSTERN cruise ANT-XXIII/2, Cape Town - Punta Arenas, 2005-11-18 - 2006-01-13
No full textStation list and links to master tracks in different resolutions of POLARSTERN cruise ANT-XXIII/2, Cape Town - Punta Arenas, 2005-11-18 - 2006-01-1
Links to master tracks in different resolutions of POLARSTERN cruise PS113 (ANT-XXXIII/4), Punta Arenas - Bremerhaven, 2018-05-08 - 2018-06-11
No full textLinks to master tracks in different resolutions of POLARSTERN cruise PS113 (ANT-XXXIII/4), Punta Arenas - Bremerhaven, 2018-05-08 - 2018-06-1
Raw data of SCADCP (self-contained Acoustic Doppler Current Profiler) from mooring AWI229-7
No full textThe ADCP used was of the type RDI Workhorse Longranger (Teledyne RD Instruments USA, Poway, California), using a four-beam, convex configuration with a beam angle of 20° and a frequency of 76.8 kHz. The instrument was moored at mean depth of 389 m in upward-looking mode and measured horizontal and vertical currents and acoustic backscatter intensity. Heading, pitch and roll, pressure and temperature data were also collected. The number of depth cells was set to 80 with a bin size of 8 m. The sampling interval was set to 1 ping per ensemble with a ping rate of about 1 ping every 4 minutes. The mooring AWI229-7 was deployed in December 2005 during R. V. Polarstern cruise ANT-XXIII/2 and recovered during R. V. Polarstern cruise ANT-XXIV/3 in March 2008.
Project: Lazarev Sea Krill Study (LAKRIS), Funded by German Ministry of Education and Researc
Paradoxes and management approaches of competing for work in creative professional service firms
No full textDespite their business relevance, creative professional service firms are under-researched, in particular with regard to how they compete for work. Competing for work is key to survival, but also extremely challenging due to the complexity of the services offered. In this paper we use a paradox framework to investigate the opposing demands that creative professional service firms experience when competing for work. Based on a set of semi-structured interviews in the context of architectural competitions, we show that creative professional service firms face two interwoven paradoxes which relate to the strategic intent (why to compete) and the design intent (what to propose) of client propositions. We describe these paradoxes and explain how organizations manage and cope with them through both synthesis and separation management approaches. Contributions of this study can be found in theorizing paradoxes of competing for work from the professional service provider's perspective, and in fostering the firms’ paradoxical mind-set, which facilitates the acceptance and resolution of complexity and different competing demands.Accepted Author ManuscriptPublic Commissionin
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