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| Titel |
Validation of GRACE electron densities by incoherent scatter radar data |
| VerfasserIn |
Chao Xiong, Hermann Lühr, Shuying Ma, Kristian Schlegel |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250088798
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| Publikation (Nr.) |
 EGU/EGU2014-5011.pdf |
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| Zusammenfassung |
| This paper presents an effort to derive the electron density measurements from the GRACE
K-Band Ranging system. The derived electron density data from 2002 to 2012 were
subsequently validated by using incoherent scatter radar observations. It is possible to obtain
the variation of the horizontal total eelctron content between the two GRACE spacecraft.
When converted to electron density, an arbitrary bias value remains. For adjusting the bias of
GRACE electron density data, the observations from EISCAT at Tromsø and Svalbard
are used. The adjusted GRACE electron density are compared for validation with
the observations from incoherent scatter radars at Millstone hill and Arecibo. The
results show an excellent agreement between the adjusted GRACE electron density
and radar observations, yielding correlation coefficients as high as 0.97. The scale
factor of GRACE data is lower by 5% and 2% compared to Millstone Hill and
Arecibo readings, respectively. We consider both these differences as with in the
uncertainty of radar measurements. From both radars we obtain an average bias
of 1-
1010 m-3 for the GRACE data. Considering the resolution of the GRACE
electron density observation is 1-
109 m-3, the effects of the bias can be negligible. |
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