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  • Alfred Wegener Institute for Polar and Marine Research  (3)
  • Taylor & Francis  (2)
  • EDP Sciences - Web of Conferences  (1)
  • 2010-2014  (6)
  • 1
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    Ground validation of oceanic snowfall detection in satellite climatologies during LOFZY (2010)
    Taylor & Francis
    In:  Tellus A: Dynamic meteorology and oceanography, 62 (4). pp. 469-480.
    Details
    Publication Date: 2016-06-15
    Description: A thorough knowledge of global ocean precipitation is an indispensable prerequisite for the understanding of the water cycle in the global climate system. However, reliable detection of precipitation over the global oceans, especially of solid precipitation, remains a challenging task. This is true for both, passive microwave remote sensing and reanalysis based model estimates. The optical disdrometer ODM 470 is a ground validation instrument capable of measuring rain and snowfall on ships even under high wind speeds. It was used for the first time over the Nordic Seas during the LOFZY 2005 campaign. A dichotomous verification of precipitation occurrence resulted in a perfect correspondence between the disdrometer, a precipitation detector and a shipboard observer's log. The disdrometer data is further point-to-area collocated against precipitation from the satellite based Hamburg Ocean Atmosphere Parameters and fluxes from Satellite data (HOAPS) climatology. HOAPS precipitation turns out to be overall consistent with the disdrometer data resulting in a detection accuracy of 0.96. The collocated data comprises light precipitation events below 1 mm h–1. Therefore two LOFZY case studies with high precipitation rates are presented that indicate plausible HOAPS satellite precipitation rates. Overall, this encourages longer term measurements of ship-to-satellite collocated precipitation in the near future.
    Type: Article , PeerReviewed
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  • 2
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    Radiative effects of the cloudy atmosphere from ground and satellite based observations (2010)
    EDP Sciences - Web of Conferences
    In:  EPJ Web of Conferences, 9 . pp. 83-94.
    Details
    Publication Date: 2019-01-22
    Description: The radiation budget from surface observations and parameterizations is combined with that from satellite observations along the cruise tracks of the German icebreaker POLARSTERN in the North and South Atlantic under tropical, subtropical and mid-latitude conditions. Between 2008 and 2010 The German Leibniz-network OCEANET participated in six transfers from or to Bremerhaven, Germany to or from Punta Arenas, Southern Chile or Cape Town, South Africa. The present chapter introduces exemplarily the atmospheric measurements and resulting radiation products. The following properties are derived: Standard meteorological data, broadband downward solar and thermal irradiances, underwater profiles of spectral irradiance, latent and sensible heat fluxes, humidity and temperature profiles, water vapour and liquid water path, aerosol optical thickness and vertical profiles of aerosol optical thickness, cloud cover and cloud type. Cloud radiative effects at the surface have been determined for different marine cloud types. Together with top-of-atmosphere radiation fluxes from the SEVIRI radiometer onboard METEOSAT, the effect of clouds on atmospheric heating or cooling have been determined. The resulting cloud/radiation correlations will help to quantify the effects of clouds on the surface, ToA- and atmospheric radiation budget and to evaluate the ability of climate models to simulate these effects.
    Type: Article , PeerReviewed
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  • 3
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    HOAPS precipitation validation with ship-borne rain gauge measurements over the Baltic Sea (2012)
    Taylor & Francis
    In:  Tellus A: Dynamic meteorology and oceanography, 64 (18486).
    Details
    Publication Date: 2016-06-14
    Description: Global ocean precipitation is an important part of the water cycle in the climate system. A number of efforts have been undertaken to acquire reliable estimates of precipitation over the oceans based on remote sensing and reanalysis modelling. However, validation of these data is still a challenging task, mainly due to a lack of suitable in situ measurements of precipitation over the oceans. In this study, validation of the satellite-based Hamburg Ocean Atmosphere Parameters and fluxes from Satellite data (HOAPS) climatology was conducted with in situ measurements by ship rain gauges over the Baltic Sea from 1995 to 1997. The ship rain gauge data are point-to-area collocated against the HOAPS data. By choosing suitable collocation parameters, a detection rate of up to about 70% is achieved. Investigation of the influence of the synoptic situation on the detectability shows that HOAPS performs better for stratiform than for convective precipitation. The number of collocated data is not sufficient to validate precipitation rates. Thus, precipitation rates were analysed by applying an interpolation scheme based on the Kriging method to both data sets. It was found that HOAPS underestimates precipitation by about 10%, taking into account that precipitation rates below 0.3 mm h−1 cannot be detected from satellite information.
    Type: Article , PeerReviewed
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  • 4
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    Weekly reports for R.V. Polarstern expedition ANT-XXVII/1 (2010-10-25 - 2010-11-26, Bremerhaven - Cape Town), German and English version (2010)
    Alfred Wegener Institute for Polar and Marine Research
    In:  EPIC3Alfred-Wegener-Institute for Polar- and Marine Research, Bremerhaven, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research
    Details
    Publication Date: 2014-12-12
    Repository Name: EPIC Alfred Wegener Institut
    Type: Weekly Reports , notRev
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  • 5
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    Weekly reports for R.V. Polarstern expedition ANT-XXVIII/5 (2012-04-10 - 2012-05-15, Punta Arenas - Bremerhaven), German and English version (2012)
    Alfred Wegener Institute for Polar and Marine Research
    In:  EPIC3Alfred-Wegener-Institute for Polar- and Marine Research, Bremerhaven, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research
    Details
    Publication Date: 2014-12-12
    Repository Name: EPIC Alfred Wegener Institut
    Type: Weekly Reports , notRev
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  • 6
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    The expedition of the research vessel "Polarstern" to the Antarctic in 2012 (ANT-XXVIII/5) (2012)
    Alfred Wegener Institute for Polar and Marine Research
    In:  EPIC3Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research, 654, 73 p., ISSN: 1866-3192
    Details
    Publication Date: 2018-09-12
    Repository Name: EPIC Alfred Wegener Institut
    Type: "Berichte zur Polar- und Meeresforschung" , notRev
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