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Topographische Karte des Wattgebietes aus ERS-1, SAR- und Modelldaten (2001)

Klocke, Britta ; Heygster, Georg

Berlin : Logos-Verl.

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Schlagwort(e): Forschungsbericht ; Hochschulschrift ; Süderoog ; Watt ; Topografische Karte ; Ganglinie ; ERS ; Radarfernerkundung

Materialart: Online-Ressource

Seiten: Online Ressource, 131 p. = 11,3 Mb, text and images , ill., graphs

Ausgabe: [Elektronische Ressource]

Serie: [Berichte aus dem Institut für Umweltphysik 7]

URL: https://edocs.tib.eu/files/e01fb01/338678778.pdf

URL: https://edocs.tib.eu/files/e01fb01/338678778l.pdf

Sprache: Deutsch

Anmerkung: Contract BMBF 03 KIS309/8. - Differences between the printed and electronic version of the document arepossible. - nIndex p. 127 - 131 , Also available as printed version , Zugl.: Bremen, Univ., Diss, 2001 , Systemvoraussetzungen: Acrobat Reader.

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GEOMAR KATALOG

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Ice concentration in the Southern Ocean for the years 1978 to 1997, results from the PELICON Project

Heygster, Georg ; Pedersen, Leif Toudal ; Turner, John ; [weitere]

PANGAEA

In: Institut für Umweltphysik, Universität Bremen

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Publikationsdatum: 2023-05-12

Beschreibung: Sea ice is an integral part of the climate system of the high latitude regions. Up to now, control of its occurrence and extent, especially its interannual and long-term variability, has proved difficult to isolate or quantify, especially in the data devoid regions of the Southern Ocean. The consequences of climate change induced, for example, by the continued increase of greenhouse gases, on the occurrence of sea ice, is even less certain, although the theory at least suggests that sea ice extent changes could be expected to have a positive feedback role, i.e. that reduced ice extent could be expected to enhance warming at high latitudes. The interaction of sea ice with the polar ocean and atmosphere can be summerized as follows: - The snow covered sea ice reflects the solar illumination much stronger compared to open water areas. Therefore, changes in the horizontal coverage of sea ice (ice concentration) would be related to changes of the surface reflectivity. In the polar winter, sea ice isolates the ocean from the cold polar atmosphere and reduces the heat transfer by one or two orders. Both has a strong impact on the radiation balance. - Sea ice growth and melting has a signinficant influence on the circulation of the oceans. The formation of sea ice increases the water density of the ocean boundary layer due to rejection of brine. This results in an unstable stratification of the ocean layer and deep water formation can occure. The opposite behaviour can be observed when sea ice melts. The additional freshwater causes the ocean to form a stable boundary layer.

Schlagwort(e): Date/time end; Date/time start; Description; OBSE; Observation; ORDINAL NUMBER; PELICON; Southern Ocean; Uniform resource locator/link to raw data file

Materialart: Dataset

Format: text/tab-separated-values, 160 data points

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DATA PANGAEA

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Sea Ice and Atmospheric Parameter Retrieval From Satellite Microwave Radiometers: Synergy of AMSR2 and SMOS Compared With the CIMR Candidate Mission (2021)

Scarlat, Raul Cristian ; Spreen, Gunnar ; Heygster, Georg ; [weitere]

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Publikationsdatum: 2021-10-06

Beschreibung: Research on improving the prediction skill of climate models requires refining the quality of observational data used for initializing and tuning the models. This is especially true in the polar regions where uncertainties about the interactions between sea ice, ocean, and atmosphere are driving ongoing monitoring efforts. The Copernicus Imaging Microwave Radiometer (CIMR) is an European Space Agency (ESA) candidate mission which promises to offer high resolution, low uncertainty observation capabilities at the 1.4, 6.9, 10.65, 18.7, and 36.5 GHz frequencies. To assess the potential impact of CIMR for sea ice parameter retrieval, a comparison is made between retrievals based on present AMSR2 observations and a retrieval using future CIMR equivalent observations over a data set of validated sea ice concentration (SIC) values. An optimal estimation retrieval method (OEM) is used which can use input from different channel combinations to retrieve seven geophysical parameters (sea ice concentration, multi-year ice fraction, ice surface temperature, columnar water vapor, liquid water path, over ocean wind speed, and sea surface temperature). An advantage of CIMR over existing radiometers is that it would provide higher spatial resolution observations at the lower frequency channels (6.9, 10.65, and 18.7 GHz) which are less sensitive to atmospheric influence. This enables the passive microwave based retrieval of SIC and other surface parameters with higher resolution and lower uncertainty than is currently possible. An information content analysis expands the comparison between AMSR2 and CIMR to all retrievable surface and atmospheric parameters. This analysis quantifies the contributions to the observed signal and highlights the differences between different input channel combinations. The higher resolution of the low frequency CIMR channels allow for unprecedented detail to be achieved in Arctic passive microwave sea ice retrievals. The presence of 1.4 GHz channels on board CIMR opens up the possibility for thin sea ice thickness (SIT) retrieval. A combination of collocated AMSR2 and SMOS observations is used to simulate a full CIMR suite of measurements, and the OEM is modified to include SIT as a retrieval parameter. The output from different retrieval configurations is compared with an operational SIT product. The CIMR instrument can provide increased accuracy for SIC retrieval at very high resolutions with a combination of the 18.7 and 36.5 GHz channels while also maintaining sensitivity for atmospheric water vapor retrieval. In combination with the 1.4 GHz channels, SIT can be added as an eighth retrieval parameter with performance on par with existing operational products.

Schlagwort(e): 551.6 ; sea ice ; satellite semote sensing ; passive microwave ; Arctic ; optimal estimation ; information content analysis

Sprache: Englisch

Materialart: map

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CITATION GEO-LEO

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