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  1. Artikel ; Online: The Rapid and Steady Mass Loss of the Patagonian Icefields throughout the GRACE Era

    Andreas Richter / Andreas Groh / Martin Horwath / Erik Ivins / Eric Marderwald / José Luis Hormaechea / Raúl Perdomo / Reinhard Dietrich

    Remote Sensing, Vol 11, Iss 8, p

    2002–2017

    2019  Band 909

    Abstract: We use the complete gravity recovery and climate experiment (GRACE) Level-2 monthly time series to derive the ice mass changes of the Patagonian Icefields (Southern Andes). The glacial isostatic adjustment is accounted for by a regional model that is ... ...

    Abstract We use the complete gravity recovery and climate experiment (GRACE) Level-2 monthly time series to derive the ice mass changes of the Patagonian Icefields (Southern Andes). The glacial isostatic adjustment is accounted for by a regional model that is constrained by global navigation satellite systems (GNSS) uplift observations. Further corrections are applied concerning the effect of mass variations in the ocean, in the continental water storage, and of the Antarctic ice sheet. The 161 monthly GRACE gravity field solutions are inverted in the spatial domain through the adjustment of scaling factors applied to a-priori ice mass change patterns based on published remote sensing results for the Southern and Northern Patagonian Icefields, respectively. We infer an ice mass change rate of −24.4 ± 4.7 Gt/a for the Patagonian Icefields between April 2002 and June 2017, which corresponds to a contribution to the eustatic sea level rise of 0.067 ± 0.013 mm/a. Our time series of monthly ice mass changes reveals no indication for an acceleration in ice mass loss. We find indications that the Northern Patagonian Icefield contributes more to the integral ice loss than previously assumed.
    Schlagwörter ice mass ; satellite gravimetry ; Patagonia ; GRACE ; Science ; Q
    Thema/Rubrik (Code) 550
    Sprache Englisch
    Erscheinungsdatum 2019-04-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel ; Online: Lake-level variations of Lago Fagnano, Tierra del Fuego

    Luciano MENDOZA / Gunter LIEBSCH / Daniel DEL COGLIANO / Andreas RICHTER / Mathias FRITSCHE / Reinhard DIETRICH / Raúl PERDOMO / Jose Luis HORMAECHEA

    Journal of Limnology, Vol 69, Iss 1, Pp 29-

    observations, modelling and interpretation

    2010  Band 41

    Abstract: The lake-level variations of Lago Fagnano, the largest lake in Tierra del Fuego, southernmost South America, on time scales from a few minutes to three years are investigated using a geodetic approach and applying the tools of time series analysis. Based ...

    Abstract The lake-level variations of Lago Fagnano, the largest lake in Tierra del Fuego, southernmost South America, on time scales from a few minutes to three years are investigated using a geodetic approach and applying the tools of time series analysis. Based on pressure tide gauge records at three locations in the lake precise lake-level time series are derived. The analysis of the observed variations in space, time and frequency domain leads to the separation of the principal force-response mechanisms. We show that the lake-level variations in Lago Fagnano can be described essentially as a combination of lake-level shift and tilt and of surface seiches. Regarding the lake-level response to air-pressure forcing, a significant departure from the inverse barometer model is found. Surface seiches dynamics are particularly intensive in Lago Fagnano pointing towards exceptionally low dissipative friction. An undisturbed series of seiches lasting eleven days is presented; and at least eleven longitudinal modes are identified. Based on the characterisation of the main contributions in space and time as well as their relation to the driving forces, a model for the transfer of the lake-level variations at a reference point to an arbitrary location in the lake with an accuracy of 1 cm is developed.
    Schlagwörter hydrodynamics ; lake level ; surface seiches ; tide gauge ; time series analysis ; Geography. Anthropology. Recreation ; G ; Physical geography ; GB3-5030 ; Environmental sciences ; GE1-350
    Thema/Rubrik (Code) 333
    Sprache Englisch
    Erscheinungsdatum 2010-02-01T00:00:00Z
    Verlag PAGEPress Publications
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  3. Artikel: Lake-level variations of Lago Fagnano, Tierra del Fuego: observations, modelling and interpretation

    Andreas RICHTER / Jose Luis HORMAECHEA / Reinhard DIETRICH / Raúl PERDOMO / Mathias FRITSCHE / Daniel DEL COGLIANO / Gunter LIEBSCH / Luciano MENDOZA

    Abstract: The lake-level variations of Lago Fagnano, the largest lake in Tierra del Fuego, southernmost South America, on time scales from a few minutes to three years are investigated using a geodetic approach and applying the tools of time series analysis. Based ...

    Abstract The lake-level variations of Lago Fagnano, the largest lake in Tierra del Fuego, southernmost South America, on time scales from a few minutes to three years are investigated using a geodetic approach and applying the tools of time series analysis. Based on pressure tide gauge records at three locations in the lake precise lake-level time series are derived. The analysis of the observed variations in space, time and frequency domain leads to the separation of the principal force-response mechanisms. We show that the lake-level variations in Lago Fagnano can be described essentially as a combination of lake-level shift and tilt and of surface seiches. Regarding the lake-level response to air-pressure forcing, a significant departure from the inverse barometer model is found. Surface seiches dynamics are particularly intensive in Lago Fagnano pointing towards exceptionally low dissipative friction. An undisturbed series of seiches lasting eleven days is presented; and at least eleven longitudinal modes are identified. Based on the characterisation of the main contributions in space and time as well as their relation to the driving forces, a model for the transfer of the lake-level variations at a reference point to an arbitrary location in the lake with an accuracy of 1 cm is developed.
    Sprache Englisch
    Dokumenttyp Artikel
    Datenquelle AGRIS - International Information System for the Agricultural Sciences and Technology

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