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  • 1
    Online Resource
    Online Resource
    Museo Argentino de Ciencia Naturales ; 2006
    In:  Revista del Museo Argentino de Ciencias Naturales Vol. 8 ( 2006), p. 9-26
    In: Revista del Museo Argentino de Ciencias Naturales, Museo Argentino de Ciencia Naturales, Vol. 8 ( 2006), p. 9-26
    Type of Medium: Online Resource
    ISSN: 1514-5158
    Uniform Title: Relaciones estratigráficas e hidroquímicas de los acuíferos Pampeano y Puelches en el noreste de la provincia de Buenos Aires
    Language: Unknown
    Publisher: Museo Argentino de Ciencia Naturales
    Publication Date: 2006
    detail.hit.zdb_id: 2620558-0
    detail.hit.zdb_id: 1501606-7
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  • 2
    Online Resource
    Online Resource
    Fundacion Miguel Lillo ; 2023
    In:  Acta Geológica Lilloana ( 2023-09-04), p. 49-87
    In: Acta Geológica Lilloana, Fundacion Miguel Lillo, ( 2023-09-04), p. 49-87
    Abstract: El extremo norte de la Isla Grande de Tierra del Fuego es una región de clima semiárido, con predominio de cauces fluviales intermitentes y precipitaciones anuales de aproximadamente 300 mm. Tanto en el sector argentino como chileno, esta zona se caracteriza por la presencia de estancias ganaderas y el desarrollo de actividades hidrocarburíferas. En este contexto, el agua representa un bien indispensable, el cual, requiere ser estudiado, cuidado y utilizado de forma sostenible, para su preservación y adecuada disponibilidad futura. Se identificaron en la zona argentina dos unidades de interés hidrogeológico correlacionables con las definidas en el sector chileno. La primera, conformada por los Acuíferos del Cuaternario, es somera, libre y se encuentra alojada en depósitos glacifluviales cuaternarios. La segunda, conformada por las capas infrayacentes, corresponde al Sistema Acuífero Terciario, conformada por acuíferos confinados a semiconfinados, alojados en depósitos terciarios, fluviales y deltaicos a marinos marginales. En el sector argentino el análisis de los registros geofísicos permitió delimitar la base del Sistema Acuífero Terciario, aproximadamente entre -300 y -350 msnm y, consecuentemente, variaciones generales en la geometría del mismo. Se propuso un criterio geofísico, usando la resistividad, que podría servir para diferenciar las diferentes unidades. Así mismo, se realizó un cálculo estimativo de las reservas totales, correspondientes al área argentino, para cada unidad acuífera. Finalmente, fue posible la confección de un mapa hidroestratigráfico y de piezometría del Sistema Acuífero Terciario del sector argentino correlacionable con los estudios de lado chileno.
    Type of Medium: Online Resource
    ISSN: 1852-6217
    Language: Unknown
    Publisher: Fundacion Miguel Lillo
    Publication Date: 2023
    detail.hit.zdb_id: 2526835-1
    SSG: 13
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  • 3
    Online Resource
    Online Resource
    Elsevier BV ; 2018
    In:  Geochimica et Cosmochimica Acta Vol. 237 ( 2018-09), p. 320-338
    In: Geochimica et Cosmochimica Acta, Elsevier BV, Vol. 237 ( 2018-09), p. 320-338
    Type of Medium: Online Resource
    ISSN: 0016-7037
    RVK:
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2018
    detail.hit.zdb_id: 300305-X
    detail.hit.zdb_id: 1483679-8
    SSG: 13
    SSG: 16,12
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  • 4
    Online Resource
    Online Resource
    Copernicus GmbH ; 2018
    In:  The Cryosphere Vol. 12, No. 4 ( 2018-04-10), p. 1211-1232
    In: The Cryosphere, Copernicus GmbH, Vol. 12, No. 4 ( 2018-04-10), p. 1211-1232
    Abstract: Abstract. The South Shetland Islands are located at the northern tip of the Antarctic Peninsula (AP). This region was subject to strong warming trends in the atmospheric surface layer. Surface air temperature increased about 3 K in 50 years, concurrent with retreating glacier fronts, an increase in melt areas, ice surface lowering and rapid break-up and disintegration of ice shelves. The positive trend in surface air temperature has currently come to a halt. Observed surface air temperature lapse rates show a high variability during winter months (standard deviations up to ±1.0K(100m)-1) and a distinct spatial heterogeneity reflecting the impact of synoptic weather patterns. The increased mesocyclonic activity during the wintertime over the past decades in the study area results in intensified advection of warm, moist air with high temperatures and rain and leads to melt conditions on the ice cap, fixating surface air temperatures to the melting point. Its impact on winter accumulation results in the observed negative mass balance estimates. Six years of continuous glaciological measurements on mass balance stake transects as well as 5 years of climatological data time series are presented and a spatially distributed glacier energy balance melt model adapted and run based on these multi-year data sets. The glaciological surface mass balance model is generally in good agreement with observations, except for atmospheric conditions promoting snow drift by high wind speeds, turbulence-driven snow deposition and snow layer erosion by rain. No drift in the difference between simulated mass balance and mass balance measurements can be seen over the course of the 5-year model run period. The winter accumulation does not suffice to compensate for the high variability in summer ablation. The results are analysed to assess changes in meltwater input to the coastal waters, specific glacier mass balance and the equilibrium line altitude (ELA). The Fourcade Glacier catchment drains into Potter cove, has an area of 23.6 km2 and is glacierized to 93.8 %. Annual discharge from Fourcade Glacier into Potter Cove is estimated to q¯=25±6hm3yr-1 with the standard deviation of 8 % annotating the high interannual variability. The average ELA calculated from our own glaciological observations on Fourcade Glacier over the time period 2010 to 2015 amounts to 260±20 m. Published studies suggest rather stable conditions of slightly negative glacier mass balance until the mid-1980s with an ELA of approx. 150 m. The calculated accumulation area ratio suggests dramatic changes in the future extent of the inland ice cap for the South Shetland Islands.
    Type of Medium: Online Resource
    ISSN: 1994-0424
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2018
    detail.hit.zdb_id: 2393169-3
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  • 5
    Online Resource
    Online Resource
    Instituto Geologico y Minero de Espana ; 2017
    In:  BOLETÍN GEOLÓGICO Y MINERO Vol. 128, No. 1 ( 2017-3), p. 207-220
    In: BOLETÍN GEOLÓGICO Y MINERO, Instituto Geologico y Minero de Espana, Vol. 128, No. 1 ( 2017-3), p. 207-220
    Type of Medium: Online Resource
    ISSN: 0366-0176
    URL: Issue
    Language: Unknown
    Publisher: Instituto Geologico y Minero de Espana
    Publication Date: 2017
    detail.hit.zdb_id: 2099883-1
    SSG: 13
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  • 6
    Online Resource
    Online Resource
    The Royal Society ; 2018
    In:  Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences Vol. 376, No. 2122 ( 2018-06-28), p. 20170166-
    In: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, The Royal Society, Vol. 376, No. 2122 ( 2018-06-28), p. 20170166-
    Abstract: Although the relationship between surface air temperature and glacial discharge has been studied in the Northern Hemisphere for at least a century, similar studies for Antarctica remain scarce and only for the past four decades. This data scarcity is due to the extreme meteorological conditions and terrain inaccessibility. As a result, the contribution of glacial discharge in Antarctica to global sea-level rise is still attached with great uncertainties, especially from partly glaciated hydrological basins as can be found in the Antarctic Peninsula. In this paper, we propose a simplified model based on the Monte Carlo method and Fourier analysis for estimating discharge in partly glaciated and periglacial hydrological catchments with a summer melt period. Our model offers the advantage of scarce data requirements and quick recognition of periglacial environments. Discharge was found to be highly correlated with surface air temperature for the partially glaciated hydrological catchments on Potter Peninsula, King George Island (Isla 25 Mayo). The model is simple to implement and requires few variables to make most versatile simulations. We have obtained a monthly simulated maximum flow estimates between 0.74 and 1.07 m 3  s −1 for two creeks (South and North Potter) with a very good fit to field observations. The glacial mean monthly discharge during summer months was estimated to 0.44±0.02 m 3  s −1 for South Potter Creek and 0.55±0.02 m 3  s −1 for North Potter Creek. This article is part of the theme issue ‘The marine system of the West Antarctic Peninsula: status and strategy for progress in a region of rapid change’.
    Type of Medium: Online Resource
    ISSN: 1364-503X , 1471-2962
    RVK:
    Language: English
    Publisher: The Royal Society
    Publication Date: 2018
    detail.hit.zdb_id: 208381-4
    detail.hit.zdb_id: 1462626-3
    SSG: 11
    SSG: 5,1
    SSG: 5,21
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  • 7
    Online Resource
    Online Resource
    The Royal Society ; 2018
    In:  Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences Vol. 376, No. 2122 ( 2018-06-28), p. 20170163-
    In: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, The Royal Society, Vol. 376, No. 2122 ( 2018-06-28), p. 20170163-
    Abstract: Glacial meltwater discharge from Antarctica is a key influence on the marine environment, impacting ocean circulation, sea level and productivity of the pelagic and benthic ecosystems. The responses elicited depend strongly on the characteristics of the meltwater releases, including timing, spatial structure and geochemical composition. Here we use isotopic tracers to reveal the time-varying pattern of meltwater during a discharge event from the Fourcade Glacier into Potter Cove, northern Antarctic Peninsula. The discharge is strongly dependent on local air temperature, and accumulates into an extremely thin, buoyant layer at the surface. This layer showed evidence of elevated turbidity, and responded rapidly to changes in atmospherically driven circulation to generate a strongly pulsed outflow from the cove to the broader ocean. These characteristics contrast with those further south along the Peninsula, where strong glacial frontal ablation is driven oceanographically by intrusions of warm deep waters from offshore. The Fourcade Glacier switched very recently to being land-terminating; if retreat rates elsewhere along the Peninsula remain high and glacier termini progress strongly landward, the structure and impact of the freshwater discharges are likely to increasingly resemble the patterns elucidated here. This article is part of the theme issue ‘The marine system of the West Antarctic Peninsula: status and strategy for progress in a region of rapid change’.
    Type of Medium: Online Resource
    ISSN: 1364-503X , 1471-2962
    RVK:
    Language: English
    Publisher: The Royal Society
    Publication Date: 2018
    detail.hit.zdb_id: 208381-4
    detail.hit.zdb_id: 1462626-3
    SSG: 11
    SSG: 5,1
    SSG: 5,21
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  • 8
    In: Isotopes in Environmental and Health Studies, Informa UK Limited, Vol. 56, No. 5-6 ( 2020-11-01), p. 513-532
    Type of Medium: Online Resource
    ISSN: 1025-6016 , 1477-2639
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2100190-X
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  • 9
    Online Resource
    Online Resource
    Copernicus GmbH ; 2021
    In:  Hydrology and Earth System Sciences Vol. 25, No. 6 ( 2021-06-14), p. 3227-3244
    In: Hydrology and Earth System Sciences, Copernicus GmbH, Vol. 25, No. 6 ( 2021-06-14), p. 3227-3244
    Abstract: Abstract. There are only a small number of recent publications discussing glacial runoff in Antarctica, and even fewer of them deal with the groundwater flow discharge. This paper focuses on the groundwater flow aspects and is based on a detailed study performed on a small hydrological catchment, informally called Potter basin, located on King George Island (KGI; Isla 25 de Mayo), South Shetland Islands, at the northern tip of the Antarctic Peninsula. The basin is representative for the rugged coastline of the northern Antarctic Peninsula and is discussed as a case study for the possible future evolution of similar basins further to the south. A conceptual hydrogeological model has been defined using vertical electrical soundings (VESs), geological and hydrogeological surveying methods, geomorphological interpretation based on satellite imagery, permeability tests, piezometric level measurements, meteorological, geocryological and glaciological data sets. The transmissivities of the fluvial talik aquifer and suprapermafrost aquifer range from 162.0 to 2719.9×10-5 m2 s−1 and in basaltic fissured aquifers from 3.47 to 5.79×10-5 m2 s−1. The transmissivities found in the active layer of hummocky moraines amount to 75.23×10-5 m2 s−1 and to 163.0×10-5 m2 s−1 in the sea deposits, and in the fluvioglacial deposits, they were observed between 902.8 and 2662.0×10-5 m2 d−1. Finally, the groundwater flow discharge was assessed to 0.47 m3 s−1 (during the austral summer months of January and February), and the total groundwater storage was estimated to 560×103 m3. The Antarctic Peninsula region has experienced drastic climatological changes within the past five decades. Under the Intergovernmental Panel on Climate Change scenarios, a further warming of the polar regions can be expected as polar amplification of our changing climate. Although the basin in consideration is small and results are valid only during austral summers with surface air temperatures above the freezing point, it serves as model study that can be regarded as representative for the western coastline of the Antarctic Peninsula further south under expected future warming, with surface air temperatures periodically surpassing freezing point. This data can be used to adjust glacial mass balance assessments in the region and to improve the understanding of coastal sea water processes, and their effects on the marine biota, as a consequence of the global climate change.
    Type of Medium: Online Resource
    ISSN: 1607-7938
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2021
    detail.hit.zdb_id: 2100610-6
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  • 10
    In: Frontiers in Earth Science, Frontiers Media SA, Vol. 8 ( 2020-7-14)
    Type of Medium: Online Resource
    ISSN: 2296-6463
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2020
    detail.hit.zdb_id: 2741235-0
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