A5086840415- Oceanographic and Atmospheric Processes
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Climate variability and models
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Geological Studies and Exploration
- Marine and fisheries research
- Geological formations and processes
- Atmospheric and Environmental Gas Dynamics
- Advanced Combustion Engine Technologies
- Marine and environmental studies
- Ocean Waves and Remote Sensing
- Ocean Acidification Effects and Responses
- Marine Biology and Ecology Research
- Underwater Acoustics Research
- Vehicle emissions and performance
- Geological and Geophysical Studies
- Geophysics and Gravity Measurements
- Hydrocarbon exploration and reservoir analysis
- Atmospheric aerosols and clouds
- Ionosphere and magnetosphere dynamics
- Isotope Analysis in Ecology
- Electric and Hybrid Vehicle Technologies
- Aerodynamics and Fluid Dynamics Research
University of Kassel
2020
Praxis
2020
GEOMAR Helmholtz Centre for Ocean Research Kiel
2008-2019
Mercedes-Benz (Germany)
2013
Klinikum Stuttgart
2008
Zentrum für Seelische Gesundheit
2008
Kiel University
1986-2006
Karlsruhe Institute of Technology
2004-2005
Leibniz Institute for Neurobiology
2004
Karlsruhe University of Education
2001-2002
An array of overturning data The Atlantic meridional circulation (AMOC) has a strong influence on climate, so it is important to understand how global warming may affect it. Lozier et al. report initial results from the Overturning in Subpolar North Program (OSNAP) (see Perspective by Rhein). OSNAP been measuring flux water transported high latitudes Atlantic. measurements reveal variability transport region and show that deep formation Labrador Sea not, as previously believed, be major...
The mean warm water transfer toward the equator along western boundary of South Atlantic is investigated, based on a number ship surveys carried out during 1990–96 with CTD mass observations and current profiling by shipboard lowered (with CTD/rosette) acoustic Doppler profiler Pegasus profiler. bulk northward flow follows coast in North Brazil Undercurrent (NBUC) from latitudes south 10°S, carrying 23 Sv (Sv ≡ 106 m3 s−1) above 1000 m. Out this, 16 are waters warmer than 7°C that form...
In 1997, a unique hydrographic and chlorofluorocarbon (CFC: component CFC-11) dataset was obtained in the subpolar North Atlantic. To estimate synopticity of 1997 data, recent temporal evolution CFC Labrador Sea Water (LSW) thickness fields are examined. western Atlantic north 50°N, LSW decreased considerably from 1994–97, while mean concentrations did not change much. South 50°N eastern Atlantic, concentration increased with little or no thickness. On shorter timescales, local anomalies due...
Ocean deep velocity profiles were obtained by lowering a self-contained 153.6-kHz acoustic Doppler current profiler (ADCP) attached to CTD-rosette sampler. The data sampled during two Meteor cruises in the western tropical Atlantic. ADCP depth was determined integration of vertical measurements, and maximum cast good agreement with CTD depth. Vertical shears calculated for individual 140–300-m range eliminate unknown horizontal motion instrument package. Subsequent raw shear then averaged...
The zonal circulation south of Sri Lanka is an important link for the exchange water between Bay Bengal and Arabian Sea. Results from a first array three moorings along 80°30′E north 4°10′N January 1991 to March 1992 were used investigate Monsoon Current regime [ Schott et al. , 1994]. Measurements second six current meter are presented here. This was deployed 45′S 5°N July 1993 September 1994 annual cycle interannual variability equatorial currents at this longitude. Both sets contribute...
Abstract During December 1991 to April 1992 measurements with moored acoustic Doppler current profiler (ADCP) stations and shipboard surveys were carried out in the convection regime of Gulf Lions, northwestern Mediterranean. First significant mixed layer deepening generation internal waves stratified intermediate occurred during a mistral cooling phase late December. Mixed about 400 m, eroding salinity maximum saltier warmer Levantine Intermediate Water causing temporary surface-layer...
The zonal monsoon circulation south of India/Sri Lanka is a crucial link for the exchange between northeastern and northwestern Indian Ocean. first direct measurements from moored stations shipboard profiling on seasonal shorter‐period variability this flow are presented here. Of three moorings deployed January 1991 to February 1992 along 80°30′E 4°11′N 5°39′N, outer two were equipped with upward looking acoustic Doppler current profilers (ADCPs) at 260‐m depth. ADCP revealed very shallow...
During the winter of 1988–1989 five acoustic Doppler current profilers (ADCPs) were moored in central Greenland Sea to measure vertical currents that might occur conjunction with deep mixing and convection. Two ADCPs looking up from about 300 m combined thermistor strings depth range 60–260 m, two downward 200 one was upward 1400 m. First maxima velocity variance occurred at events strong cold winds October November when cooling turbulence shallow mixed layer generated internal waves...
The current system east of the Grand Banks was intensely observed by World Ocean Circulation Experiment (WOCE) array ACM-6 during 1993–95 with eight moorings, reaching about 500 km out from shelf edge and covering water column 400-m depth to bottom. More recently, a reduced Institut für Meerskunde (IfM) at Kiel, Germany, four moorings deployed 1999–2001, focusing on deep-water flow near western continental slope. Both sets moored time series, each 22 months long, are combined here for mean...
Abstract Repeated shipboard observation sections across the boundary flow off northeastern Brazil as well acoustic Doppler current profiler (ADCP) and current-meter records from a moored array deployed during 2000–04 near 11°S are analyzed here for both northward warm water by North Undercurrent (NBUC) above approximately 1100 m southward of Atlantic Deep Water (NADW) underneath. At 5°S, mean nine yields an NBUC transport 26.5 ± 3.7 Sv (Sv ≡ 106 m3 s−1) along boundary; at five is 25.4 7.4...
The open‐ocean oxygen minimum zone (OMZ) south and east of the Cape Verde Islands is studied from CTD hydrography, ADCP velocities, Argo float trajectories, historical data, with a focus on zonal supply drainage paths. strongest located north North Equatorial Countercurrent (NECC) at about 400 to 500‐m depth just above boundary between Central Water Antarctic Intermediate (AAIW). It shown that NECC, Undercurrent 4 6°N, northern branch NECC 8 10°N are sources for oxygen‐rich water supplied...
A decade of weak convection in the Labrador Sea associated with decreasing water mass transformation, combination advective and eddy fluxes into area, caused significant warming deep waters both central boundary current system along shelf break. The connection to export Deep Water was studied based on moored meter stations between 1997 2009 at exit Sea, near break 53°N. More than 100 year‐long records spanning full column have been analyzed respect high frequency variability, decaying from...
Abstract Over the past 17 years, western boundary current system of Labrador Sea has been closely observed by maintaining 53°N observatory (moorings and shipboard station data) measuring top‐to‐bottom flow field offshore from shelf break. Volume transports for North Atlantic Deep Water (NADW) components were calculated using different methods, including gap filling procedures deployment periods with suboptimal instrument coverage. On average Western Boundary Current (DWBC) carries 30.2 ± 6.6...
Abstract The western boundary current system off Brazil is a key region for diagnosing variations of the Atlantic meridional overturning circulation (AMOC) and southern subtropical cell. In July 2013 mooring array was installed coast at 11°S similar to an between 2000 2004 same location. Here we present results from two research cruises first 10.5 months moored observations in comparison decade ago. Average transports North Undercurrent Deep Western Boundary Current (DWBC) have not changed...
The deep circulation and related transports of the southern Labrador Sea are determined from direct current observations ship surveys a moored current-meter array. measurements covered time span summer 1997 to 1999 show well-defined boundary extending approximately out 3300-m depth contour weak reverse currents farther offshore. flow has strong barotropic component, significant baroclinic is only found in shallow Current at shelf break associated with core Denmark Strait Overflow Water....
From August 11 to 22, 1993, a conductivity‐temperature‐depth/acoustic Doppler current profiler survey was carried out in the Somali‐Socotra region investigate currents and transports associated with Great Whirl Socotra Gyre circulation during height of summer monsoon. The monsoon confined upper 300 m depth, intense surface up 2.2 s −1 1.4 Gyre. Deeper‐reaching flow found northwestern part Somali Basin passage between shelf Somalia Abd al Kuri. transport 58 Sv, which nearly 25% were due...
Results from an interannually forced, 0.08° eddy‐resolving simulation based on the Hybrid Coordinate Ocean Model, in conjunction with a small but well‐determined transport database, are used to investigate currents and transports associated Atlantic meridional overturning circulation (AMOC) subpolar North (SPNA). The model results yield consistent warming western SPNA since early 1990s, along mean similar those observed for trans‐basin AMOC across World Circulation Experiment hydrographic...
Fifteen profiling floats were injected into the deep boundary current off Labrador.They ballasted to drift in core depth of Labrador Sea Water (LSW) at 1500-m and deployed two groups during March July/August 1997.Initially, for about three months, drifting within current, flow vectors used determine mean horizontal structure Deep Current, which was found be 100 km wide with an average speed 18 cm s Ϫ1 .North Flemish Cap encounters complicated topography around ''Orphan Knoll,'' there LSW...
The total of 13 existing cross‐equatorial shipboard current profiling sections taken during the WOCE period between 1990 and 2002 along 35°W are used to determine mean meridional structure zonal top‐to‐bottom circulation Brazilian coast, near 5°S, 5°N estimate transports individual identified shallow, intermediate deep branches. One results is that, on equator, a westward Equatorial Intermediate Current below Undercurrent exists.
During March 1994 a survey of the western boundary tropical Atlantic, between 10°N and 10°S, was carried out by conductivity‐temperature‐depth current profiling using shipboard lowered acoustic Doppler profilers. In near‐surface layer, above σ Θ = 24.5, inflow into regime came dominantly from low latitudes; 14 Sv that crossed equator in upper part North Brazil Current (NBC), only 2 originated south 5°S, while 12 east at 1°–5°S with South Equatorial (SEC). After crossing near 44°W, minor...
The Deep Western Boundary Current east of the Grand Banks has been observed during 1999–2005 by moored current‐meter stations and shipboard current profiling sections. These recent observations can be compared with those a WOCE array deployed 1993–95 at same location. Overall, Water currents reported here do not support suggestions basin‐wide "slowdown" Atlantic Meridional Overturning Circulation.
The zonal equatorial circulation of the upper 700 m in central tropical Atlantic is studied based on 11 cross‐equatorial ship sections taken at 23–29°W during 1999 to 2005 and data from a pair moored Acoustic Doppler current profilers deployed equator 23°W February 2004 May 2005. observations reveal existence two mean westward cores Equatorial Intermediate Current below Undercurrent. In contrast 2002 same position intraseasonal variability mooring period dominated by instead meridional...