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1
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Variability of Pacific subtropical cells in the 50-year ECCO assimilation (2007)
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In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 34(2007), 1944-8007
In: volume:34
In: year:2007
In: extent:5
Materialart: Online-Ressource
Seiten: 5
ISSN: 1944-8007
DOI: 10.1029/2006GL028478
Sprache: Englisch
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  • 2
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    Online-Ressource
    Changes in the pool of Labrador Sea Water in the subpolar North Atlantic (2007)
    Details Verfügbarkeit
    In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 34(2007), 1944-8007
    In: volume:34
    In: year:2007
    In: extent:5
    Materialart: Online-Ressource
    Seiten: 5
    ISSN: 1944-8007
    DOI: 10.1029/2006GL028959
    Sprache: Englisch
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  • 3
    Online-Ressource
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    Identifying the processes controlling the distribution of H2O2 in surface waters along a meridional transect in the eastern Atlantic (2008)
    Details Verfügbarkeit
    In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 35(2008), 1944-8007
    In: volume:35
    In: year:2008
    In: extent:5
    Beschreibung / Inhaltsverzeichnis: Hydrogen peroxide (H2O2) is an important oxidant for many bio-relevant trace metals and organic compounds and has potential as a tracer for mixing in near surface waters. In this study we combine H2O2 and bio-optical measurements with satellite data for a meridional transect from 46ʿN to 26ʿS in the eastern Atlantic in order to determine the key processes affecting its distribution. Surface H2O2 ranged from 21123 nmol L-1, with maximum inventories (0200 m) of 5.55.9 mmol m-2 found at 30ʿN and 25ʿS. Analyses showed a strong positive correlation of surface H2O2 with daily irradiances and recent precipitation, though poor correlations with CDOM suggest sunlight is the limiting reactant for H2O2 formation. Vertical distributions of H2O2 were controlled by a combination of mixing processes and phytoplankton activity. The present study highlights processes controlling global H2O2 distributions and points towards the development of parameterization schemes for prediction via satellite data.
    Materialart: Online-Ressource
    Seiten: 5
    ISSN: 1944-8007
    DOI: 10.1029/2007GL032555
    Sprache: Englisch
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  • 4
    Online-Ressource
    Online-Ressource
    Regeneration of Fe(II) during EIFeX and SOFeX (2008)
    Details Verfügbarkeit
    In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 35(2008), 1944-8007
    In: volume:35
    In: year:2008
    In: extent:5
    Beschreibung / Inhaltsverzeichnis: Investigations into Fe(II) cycling during two Southern Ocean mesoscale iron enrichment experiments, SOFeX and EIFeX, clearly show the importance of Fe(II) to iron speciation during these experiments. In both cases the added Fe(II) persisted significantly longer than its expected oxidation time indicating a significant Fe reduction process at work. During EIFeX diel studies showed a strong photochemically induced cycle in Fe(II) production in sunlit surface waters. Our results suggest that the photochemical cycling of iron may also be important in unfertilized waters of the Southern Ocean.
    Materialart: Online-Ressource
    Seiten: 5 , graph. Darst
    ISSN: 1944-8007
    DOI: 10.1029/2008GL035063
    Sprache: Englisch
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  • 5
    Online-Ressource
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    South Equatorial Undercurrent in the western to central tropical Atlantic (2008)
    Details Verfügbarkeit
    In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 35(2008), 1944-8007
    In: volume:35
    In: year:2008
    In: extent:5
    Beschreibung / Inhaltsverzeichnis: The South Equatorial Undercurrent (SEUC) in the western to central tropical Atlantic is investigated by a combination of shallow floats, with a few acoustically tracked, shipboard current measurements and hydrography. Float trajectories show a well confined SEUC revealing large standing meanders near its western origin. Transports determined from 31 sections across the SEUC increase from 5.6 Sv at 35ʿW near the western boundary to 10.2 Sv 800 km farther east. Internal recirculations north and south of the SEUC were indicated by the float trajectories and a weak transport reduction farther along its eastward progression is observed. The deep part of the South Equatorial Current carries on both sides of the SEUC interior water masses westward, and supplies almost 5 Sv to the SEUC between 35ʿW and 28ʿW, or about half of the SEUC transport in the interior tropical Atlantic.
    Materialart: Online-Ressource
    Seiten: 5 , graph. Darst.
    ISSN: 1944-8007
    DOI: 10.1029/2008GL035753
    Sprache: Englisch
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  • 6
    Online-Ressource
    Online-Ressource
    Generation of hyper climate modes (2008)
    Details Verfügbarkeit
    In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 35(2008), 1944-8007
    In: volume:35
    In: year:2008
    In: extent:5
    Beschreibung / Inhaltsverzeichnis: It is shown that some important aspects of the space-time structure of multidecadal sea surface temperature (SST) variability can be explained by local air-sea interactions. A concept for Global Hyper Climate Modesʺ is formulated: surface heat flux variability associated with regional atmospheric variability patterns is integrated by the large heat capacity of the extra-tropical oceans, leading to a continuous increase of SST variance towards longer timescales. Atmospheric teleconnections spread the extra-tropical signal to the tropical regions. Once SST anomalies have developed in the Tropics, global atmospheric teleconnections spread the signal around the world creating a global hyper climate mode. A simple model suggests that hyper climate modes can vary on timescales longer than 1,000 years. Ocean dynamics may amplify theses modes and influence the regional expression of the variability, but are not at the heart of the mechanism which produces the hyper modes.
    Materialart: Online-Ressource
    Seiten: 5 , graph. Darst
    ISSN: 1944-8007
    DOI: 10.1029/2007GL031087
    Sprache: Englisch
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  • 7
    Online-Ressource
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    Seasonal variability of the mixed layer depth in the Mediterranean Sea as derived from in situ profiles (2005)
    Details Verfügbarkeit
    In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 32(2005), 1944-8007
    In: volume:32
    In: year:2005
    In: extent:4
    Beschreibung / Inhaltsverzeichnis: A new 0.5° resolution Mediterranean climatology of the mixed layer depth based on individual profiles of temperature and salinity has been constructed. The criterion selected is a threshold value of temperature from a near-surface value at 10 m depth, mainly derived by a method applied on the global (de Boyer Montégut et al., 2004 dBM04). With respect to dBM04, the main differences reside in the absence of spatial interpolation of the final fields and in the improved spatial resolution. These changes to the method are necessary to reproduce the Mediterranean mixed layer's behavior. In the derived climatological maps, the most relevant features of the basin surface circulation are reproduced, as well as the areas prone of the deep water formation are clearly identified. Finally, the role of density in the definition of the mixed layer's differing behaviors between the oriental and the occidental regions of the basin is presented.
    Materialart: Online-Ressource
    Seiten: 4 , graph. Darst
    ISSN: 1944-8007
    DOI: 10.1029/2005GL022463
    Sprache: Englisch
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  • 8
    Online-Ressource
    Online-Ressource
    High resolution seismic imaging of the ocean structure using a small volume airgun source array in the Gulf of Cadiz (2009)
    Details Verfügbarkeit
    In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 36(2009), 1944-8007
    In: volume:36
    In: year:2009
    In: extent:6
    Materialart: Online-Ressource
    Seiten: 6 , graph. Darst
    ISSN: 1944-8007
    URL: http://dx.doi.org/10.1029/2009GL040820
    DOI: 10.1029/2009GL040820
    Sprache: Englisch
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  • 9
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    Escape of methane gas from the seabed along the West Spitsbergen continental margin (2009)
    Details Verfügbarkeit
    In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 36(2009), 1944-8007
    In: volume:36
    In: year:2009
    In: extent:5
    Beschreibung / Inhaltsverzeichnis: More than 250 plumes of gas bubbles have been discovered emanating from the seabed of the West Spitsbergen continental margin, in a depth range of 150400 m, at and above the present upper limit of the gas hydrate stability zone (GHSZ). Some of the plumes extend upward to within 50 m of the sea surface. The gas is predominantly methane. Warming of the northward-flowing West Spitsbergen current by 1°C over the last thirty years is likely to have increased the release of methane from the seabed by reducing the extent of the GHSZ, causing the liberation of methane from decomposing hydrate. If this process becomes widespread along Arctic continental margins, tens of Teragrams of methane per year could be released into the ocean.
    Materialart: Online-Ressource
    Seiten: 5 , graph. Darst
    ISSN: 1944-8007
    DOI: 10.1029/2009GL039191
    Sprache: Englisch
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  • 10
    Online-Ressource
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    Anelastic strain recovery reveals extension across SW Japan subduction zone (2009)
    Details Verfügbarkeit
    In: Geophysical research letters, Hoboken, NJ : Wiley, 1974, 36(2009), 1944-8007
    In: volume:36
    In: year:2009
    In: extent:6
    Beschreibung / Inhaltsverzeichnis: Sediment dominated convergent margins typically record substantial horizontal shortening often associated with great earthquakes. The convergent margin south of Japan is arguably one of the most extensively investigated margins and previous studies have documented extensive evidence for accretion and horizontal shortening. Here, we show results from anelastic strains recovered from three partially lithified sediment samples (~40% porosities) across the southwest Japan accretionary prism and propose that the margin is dominated by horizontal extension rather than compression. The anelastic strain results are also consistent with stress directions interpreted from two independent techniques - bore hole breakout orientations and core-scale fault data. We interpret this unexpected result to reflect geologically recent underthrusting of a thick sediment package and concomitant weakening of the decollément.
    Materialart: Online-Ressource
    Seiten: 6 , Ill., graph. Darst
    ISSN: 1944-8007
    URL: http://europa.agu.org/?view=article&uri=/journals/gl/gl0923/2009GL040749/2009GL040749.xml&t=2009GL040749
    DOI: 10.1029/2009GL040749
    Sprache: Englisch
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