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  • 1
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    Dredging: origin and effects of magmatism at the Marie Byrd Seamounts and other seamounts of the Amundsen and Bellinghausen Seas (2007)
    Alfred-Wegener-Institut für Polar- und Meeresforschung
    In:  In: The Expedition ANT-XXIII/4 of the Research Vessel Polarstern in 2006. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 557 . Alfred-Wegener-Institut für Polar- und Meeresforschung, Bremerhaven, Germany, pp. 58-66.
    Details
    Publication Date: 2013-02-18
    Type: Book chapter , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Book chapter
  • 2
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    Primary production, phytoplankton biomass and distribution, and size fractionated bulk variables of the chlorophyll maximum during an iron fertilisation experiment in the region of the Antarctic Polar Frontal Zone (2005)
    Alfred-Wegener-Institut für Polar- und Meeresforschung
    In:  In: The Expeditions ANTARKTIS XXII3-4-5 of the Research Vessel Polarstern" in 2004. , ed. by Smetacek, V., Bathmann, U. and Helmke, E. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 500 . Alfred-Wegener-Institut für Polar- und Meeresforschung, Bremerhaven, Germany, pp. 106-114.
    Details
    Publication Date: 2013-02-18
    Type: Book chapter , PeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 3
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    Patterns of spatial and temporal variability of UV transparency in Lake Tahoe, California-Nevada (2009)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Biogeosciences, 114 . G00D03.
    Details
    Publication Date: 2018-02-06
    Description: Lake Tahoe is an ultra-oligotrophic subalpine lake that is renowned for its clarity. The region experiences little cloud cover and is one of the most UV transparent lakes in the world. As such, it is an ideal environment to study the role of UV radiation in aquatic ecosystems. Long-term trends in Secchi depths showed that water transparency to visible light has decreased in recent decades, but limited data are available on the UV transparency of the lake. Here we examine how ultraviolet radiation varies relative to longer-wavelength photosynthetically active radiation (PAR, 400-700 nm, visible wavelengths) horizontally along inshore-offshore transects in the lake and vertically within the water column as well as temporally throughout 2007. UV transparency was more variable than PAR transparency horizontally across the lake and throughout the year. Seasonal patterns of Secchi transparency differed from both UV and PAR, indicating that different substances may be responsible for controlling transparency to UV, PAR, and Secchi. In surface waters, UVA (380 nm) often attenuated more slowly than PAR, a pattern visible in only exceptionally transparent waters with very low dissolved organic carbon. On many sampling dates, UV transparency decreased progressively with depth suggesting surface photobleaching, reductions in particulate matter, increasing chlorophyll a, or some combination of these increased during summer months. Combining these patterns of UV transparency with data on visible light provides a more comprehensive understanding of ecosystem structure, function, and effects of environmental change in highly transparent alpine and subalpine lakes such as Tahoe.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2008JG000816
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Simulations of convectively-driven density currents in the Atlas region using a regional model: Impacts on dust emission and sensitivity to horizontal resolution and convection schemes (2009)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Atmospheres, 114 . D08127.
    Details
    Publication Date: 2018-02-06
    Description: During the SAMUM field campaign in southern Morocco in May and June 2006 density currents generated by evaporative cooling after convective precipitation were frequently observed at the Sahara side of the Atlas Mountain chain. The associated strong surface cold-air outflow during such events has been observed to lead to dust mobilization in the foothills. Here a regional model system is used to simulate a density current case on 3 June 2006 and the subsequent dust emission. The model studies are performed with different parameterization schemes for convection, and with different horizontal model grid resolutions to examine to which extent the model system can be used for reproducing dust emissions in this region. The effect of increasing the horizontal model grid resolution from 14 km to 2.8 km on the strength on the density currents and thus on dust emission is smaller than the differences due to different convection parameterization schemes in this case study. While the results in reproducing the observed density current at the Atlas Mountain varied with different convection parameterizations, the most realistic representation of the density current is obtained at 2.8 km grid resolution at which no parameterization of deep convection is needed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2008JD010844
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Temporal Trends of Dissolved Trace Metals in Jamaica Bay, NY: Importance of Wastewater Input and Submarine Groundwater Discharge in an Urban Estuary (2009)
    Springer
    In:  Estuaries and Coasts, 32 (3). pp. 535-550.
    Details
    Publication Date: 2018-03-09
    Description: Jamaica Bay, NY, is a highly urbanized estuary within the boroughs of New York City conspicuously lacking published information on dissolved trace metal concentrations. The current study examines the distribution and cycling of trace metals in that embayment with data gathered during cruises in November 2004, April 2005, and June 2006. Most of the metal distributions (Fe, Zn, Co, Ag, Cu, Pb, Ni) in the water column are explained by the input of substantial volumes of treated wastewater effluent. However, several lines of evidence suggest that submarine groundwater discharge (SGD) is also an important source of dissolved Fe, Zn, Co, Ni, and isotopically distinct stable Pb ratios (206Pb, 207Pb, 208Pb) in the Bay. Conversely, the recirculated seawater component of SGD is an apparent sink for dissolved Mo. This study provides the first measurements of dissolved trace metals in the Jamaica Bay water column and subterranean estuary and provides evidence for trace metal input due to SGD.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s12237-009-9140-5
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Progression of transparent exopolymer particles (TEP) and potential of iron binding to TEP during EIFEX. Cruise Report: ANT21/3 EIFEX: Jan-Mar 2004 (2005)
    AWI
    In:  In: The Expeditions ANTARKTIS XXII3-4-5 of the Research Vessel "Polarstern" in 2004. , ed. by Smetacek, V., Bathmann, U. and Helmke, E. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 500 . AWI, Bremerhaven, Germany, pp. 61-66, 5 pp.
    Details
    Publication Date: 2016-06-02
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 7
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    A three-dimensional coupled model of the western Black Sea plankton dynamics: Seasonal variability and comparison to SeaWiFS data (2008)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Solid Earth, 113 (C7). C07007.
    Details
    Publication Date: 2019-07-25
    Description: The main physical and biological processes that control the seasonal cycle of the plankton dynamics over the Western Black Sea were explored by means of a three‐dimensional, 7‐compartment, on‐line coupled biophysical model that was developed for this study. Adopting high frequency forcing in terms of air‐sea interaction and Danube river inputs, we performed a simulation of the coupled model during the 2002–2003 period. A series of 8‐day Chl‐a SeaWiFS images provided a validation tool that guided us, along with available in situ measurements, to the improvement of model parameterizations and the calibration of the biological parameters. The simulation of the seasonal phytoplankton variability over the entire Western Black Sea, extending from the highly eutrophic river influenced area to the open sea area, was a major challenge that made necessary the representation of both the spatial and time variability of several processes. Despite the model simplicity, the simulated Chl‐a patterns presented a good agreement as compared to the SeaWiFS and in situ data. During winter, phytoplankton in coastal areas was shown to be limited by light availability, primarily due to the increased particulate matter concentrations, as a result of resuspension from the sediment and the increased river loads. During summer, the primary production was mostly sustained by riverine nutrients and regeneration processes and thus was strongly linked to the evolution of the Danube plume. The limiting nutrients showed deviations from the observed concentrations, indicating the necessity for a more realistic phytoplankton growth model.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2006JC003959
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Design of an automated flow injection-chemiluminescence instrument incorporating a miniature photomultiplier tube for monitoring picomolar concentrations of iron in seawater (2005)
    Hindawi Publ. Corp.
    In:  Journal of Automated Methods and Management in Chemistry, 2005 (2). pp. 37-43.
    Details
    Publication Date: 2020-07-27
    Description: A flow-injection (FI)-based instrument under Lab VIEW control for monitoring iron in marine waters is described. The instrument incorporates a miniature, low-power photomultiplier tube (PMT), and a number of microelectric and solenoid actuated valves and peristaltic pumps. The software allows full control of all flow injection components and processing of the data from the PMT. The optimised system is capable of 20 injections per hour, including preconcentration and wash steps. The detection limit (3 sd of the blank) is 21 pM at sea and the linear range is 21-2000 pM with a 60-second sample load time. Typical precision between replicate FI peaks is 5.9 ± 3.2 (n = 4) over the linear range. © 2005 Hindawi Publishing Corporation.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1155/JAMMC.2005.37
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Optical tools for ocean monitoring and research (2009)
    Copernicus Publications (EGU)
    In:  Ocean Science, 5 . pp. 661-684.
    Details
    Publication Date: 2016-10-11
    Description: Requirements for understanding the relationships between ocean color and suspended and dissolved materials within the water column, and a rapidly emerging photonics and materials technology base for performing optical based analytical techniques have generated a diverse offering of commercial sensors and research prototypes that perform optical measurements in water. Through inversion, these tools are now being used to determine a diverse set of related biogeochemical and physical parameters. Techniques engaged include measurement of the solar radiance distribution, absorption, scattering, stimulated fluorescence, flow cytometry, and various spectroscopy methods. Selective membranes and other techniques for material isolation further enhance specificity, leading to sensors for measurement of dissolved oxygen, methane, carbon dioxide, common nutrients and a variety of other parameters. Scientists are using these measurements to infer information related to an increasing set of parameters and wide range of applications over relevant scales in space and time.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/os-5-661-2009
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    The seasonal pCO2 cycle at 49°N/16.5°W in the northeastern Atlantic Ocean and what it tells us about biological productivity (2008)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 113 . C04020.
    Details
    Publication Date: 2019-09-23
    Description: A 2-year record of mixed layer measurements of CO2 partial pressure (pCO2), nitrate, and other physical, chemical, and biological parameters at a time series site in the northeast Atlantic Ocean (49N/16.5W) is presented. The data show average undersaturation of surface waters with respect to atmospheric CO2 levels by about 40 ± 15 matm, which gives rise to a perennial CO2 sink of 3.2 ± 1.3 mol m2 a1. The seasonal pCO2 cycle is characterized by a summer minimum (winter maximum), which is due to the dominance of biological forcing over physical forcing. Our data document a rapid transition from deep mixing to shallow summer stratification. At the onset of shallow stratification, up to one third of the mixed layer net community production during the productive season had already been accomplished. The combination of high prestratification productivity and rapid onset of tratification appears to have caused the observed particle flux peak early in the season. Mixed layer deepening during fall and winter reventilated CO2 from subsurface respiration of newly exported organic matter, thereby negating more than one third of the carbon drawdown by net community production in the mixed layer. Chemical signatures of both net community production and respiration are indicative of carbon overconsumption, the effects of which may be restricted, though, to the upper ocean. A comparison of the estimated net community production with satellite-based estimates of net primary production shows fundamental discrepancies in the timing of ocean productivity.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2007JC004347
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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