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| Titel |
Deriving long, time-correlated global mass-flux time series from GRACE using the mascon technique |
| VerfasserIn |
Terence Sabaka, David Rowlands, Scott Luthcke, Jean-Paul Boy, Frank Lemoine |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250036522
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| Zusammenfassung |
| The GRACE mission has provided an excellent view of Earth's time-
variable gravity field for several years and Goddard Space Flight
Center has used the K-band range-rate data directly to model this in
terms of localized mascons. In particular, we have demonstrated that
important information can be extracted even at the 2x2 degree cell
level by applying constrained least-squares to estimate mascon
parameters at discrete 10-day intervals through time. These intervals
are necessarily correlated, however, due to the dynamics of the
underlying mass-flux processes. Until now, we have been limited in
our application of temporal constraints because of the use of direct
matrix inversion schemes. However, further research has shown that
the constraint system used has a useful Kronecker product
decomposition, which can be exploited in an iterative inversion
scheme. This allows us to correlate the mascons across all time
intervals. We will present results of an analysis from April 2003 to
November 2008, which entails the solution of over 2 million mascons
correlated in both space and time. We will show the improvement over
the restricted temporal correlation of past solutions using indicators
such as ocean-bottom pressure correlation. In addition, we will show
improvements due to forward modeling hydrology. |
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