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| Titel |
Collocating satellite-based radar and radiometer measurements – methodology and usage examples |
| VerfasserIn |
G. Holl, S. A. Buehler, B. Rydberg, C. Jimenez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 3 ; Nr. 3, no. 3 (2010-06-21), S.693-708 |
| Datensatznummer |
250001115
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| Publikation (Nr.) |
 copernicus.org/amt-3-693-2010.pdf |
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| Zusammenfassung |
| Collocations between two satellite sensors are occasions where both sensors
observe the same place at roughly the same time.
We study collocations
between the Microwave Humidity Sounder (MHS) on-board NOAA-18
and the Cloud Profiling Radar (CPR) on-board CloudSat.
First, a simple method is presented to obtain those collocations and this
method is compared with a more complicated approach found in literature.
We present the statistical properties of the collocations, with particular
attention to the effects of the differences in footprint size.
For 2007, we find approximately two and a half million MHS measurements with
CPR pixels close to their centrepoints.
Most of those collocations contain at least ten CloudSat pixels and image
relatively homogeneous scenes.
In the second part, we present three possible applications for
the collocations.
Firstly,
we use the collocations to validate an operational Ice Water Path (IWP)
product from MHS measurements, produced by the
National Environment Satellite, Data and Information System (NESDIS) in the
Microwave Surface and Precipitation Products System (MSPPS).
IWP values from the CloudSat CPR are found to be significantly larger than
those from the MSPPS.
Secondly,
we compare the relation between IWP and MHS channel 5 (190.311 GHz) brightness
temperature for two datasets:
the collocated dataset, and an artificial dataset.
We find a larger variability in the collocated dataset.
Finally, we use the collocations to train an Artificial Neural Network and
describe how we can use it to develop a new MHS-based IWP product.
We also study the effect of adding measurements from the High
Resolution Infrared Radiation Sounder (HIRS), channels 8 (11.11 μm) and
11 (8.33 μm).
This shows a small improvement in the retrieval quality.
The collocations described in the article are available for public use. |
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