Comparison of CloudSat cloud liquid water paths in arctic summer using ground-based microwave radiometer |
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Authors: | Shuang Liu Georg Heygster Suping Zhang |
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Institution: | 1. College of Physical and Environmental Oceanography,Ocean University of China,Qingdao 266100,P.R.China;Institute of Environmental Physics,University of Bremen,Bremen 28357,Germany 2. Institute of Environmental Physics,University of Bremen,Bremen 28357,Germany 3. College of Physical and Environmental Oceanography,Ocean University of China,Qingdao 266100,P.R.China |
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Abstract: | Arctic clouds strongly influence the regional radiation balance, temperature, melting of sea ice, and freezing of sea water.
Despite their importance, there is a lack of systematic and reliable observations of Arctic clouds. The CloudSat satellite
launched in 2006 with a 94 GHz Cloud Profiling Radar (CPR) may contribute to close this gap. Here we compare one of the key
parameters, the cloud liquid water path (LWP) retrieved from CloudSat observations and from microwave radiometer (MWR) data
taken during the ASCOS (Arctic Summer Cloud Ocean Study) cruise of the research vessel Oden from August to September 2008.
Over the 45 days of the ASCOS cruise, collocations closer than 3 h and 100 km were found in only 9 d, and collocations closer
than 1 h and 30 km in only 2 d. The poor correlations in the scatter plots of the two LWP retrievals can be explained by the
patchiness of the cloud cover in these two days (August 5th and September 7th), as confirmed by coincident MODIS (Moderate-resolution
Imaging Spectroradiometer) images. The averages of Oden-observed LWP values are systematically higher (40–70 g m?2) than the corresponding CloudSat observations (0–50 g m?2). These are cases of generally low LWP with presumably small droplets, and may be explained by the little sensitivity of
the CPR to small droplets or by the surface clutter. |
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Keywords: | CloudSat liquid water path Arctic microwave radiometer collocation Oden |
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