 |
| Titel |
Improvements in DTU10 global ocean tide model in Polar Regions from multi-mission altimetry |
| VerfasserIn |
Yongcun Cheng, Ole Baltazar Andersen |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250051336
|
|
|
|
|
|
| Zusammenfassung |
| A new global ocean tide model DTU10 (Technical University of Denmark) representing all
major diurnal and semidiurnal tidal constituents has been developed from the global tide
model FES2004 (Finite Element Solutions), with residual tides determined using the response
method. Eighteen years of combined T/P+J1+J2 satellite altimetry phase A and four years
combined T/P+J1 satellite altimetry phase B observations inside the 66Ë parallel are
combined with ERS-2 (maximum to 155 cycles), GFO (Geosat Follow On, maximum to 172
cycles) and Envisat (maximum to 84 cycles) outside the ±66Ë is applied to residual response
analysis. A novel technique of removing annual signal improves tidal determination of
diurnal constituents from the sun-synchronous satellite ERS-2+Envisat in the Polar Regions
significantly.
The new global ocean tide model is validated by comparing harmonic constituents with
several tide gauge datasets. The results show the new tide model fit the tide gauge
measurements favorable over both the deep and shallow water, especially, in the Arctic Ocean
and the Antarctic Ocean due to the removal of the annual signals in the altimetry sea level
residuals prior to tidal determination. A comparison with 184 tide gauges in the
Arctic Ocean shows improvements in the Root Mean Square Error of 8.79%, 1.71%,
3.87% and 7.94% (M2, S2, K1 and O1) for the DTU10 model compared with the
FES2004. The improvements are 10.73%, -0.52%, 6.50% and 3.71% (M2, S2,
K1 and O1) compared with 37 tide gauges in the Antarctic Ocean, respectively. |
|
|
|
|
|
|