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| Titel |
Statistical analysis of climate-driven spatio-temporal variations of GRACE Total Water Storage in the Amazon River basin |
| VerfasserIn |
C. De Linage, H. Kim, J. Famiglietti |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069378
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| Zusammenfassung |
| The hydrology of the Amazon River basin is characterized by a strong annual cycle
due to the annual oscillation of the Inter Tropical Convergence Zone about the
equator. However, this strong annual cycle shows significant inter-annual variations.
For example, during the GRACE period, two severe drought periods occurred in
2005 and 2010 as well as strong floods in 2009. With now more than 9 years of
GRACE data, investigation of such non-linear, long-period oscillations is possible. The
Amazon River basin is strongly coupled with the climate system. Therefore, we
investigate the possible relationships between total water storage variations from GRACE
and different climate oscillations originating in the tropical Pacific and Atlantic
Oceans (such as ENSO and AMO). Based on purely statistical methods (Rotated
Empirical Orthogonal Functions and lead/lag correlation) we show that different
sub-regions of the basin have different connections with different climate indices. In
particular, we show the sensitivity of GRACE data to different types of El Niño.
Finally, by means of a Multichannel Singular Spectrum Analysis we analyze and then
compare the quasi-periodic constituents of GRACE total water storage and climate
indices. |
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