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Comparing the sea level response to pressure and wind forcing of two barotropic models: Validation with tide gauge and altimetry data

Comparing the sea level response to pressure and wind forcing of two barotropic models: Validation with tide gauge and altimetry data
Comparing the sea level response to pressure and wind forcing of two barotropic models: Validation with tide gauge and altimetry data
The sea level output from two barotropic models, Hindcast of Dynamic Processes of the Ocean and Coastal Areas of Europe (HIPOCAS) and Dynamic Atmospheric Correction (DAC), are compared and evaluated on the basis of coastal tide gauges (TG) and TOPEX/POSEIDON measurements in the Mediterranean Sea and the NE Atlantic Ocean for the period 1993–2001. Both models reduce the observed sea level variance more than the classical inverted barometer correction. However, differences between the models arise for different regions and frequency bands. In coastal areas, Hindcast of Dynamic Processes of the Ocean and Coastal Areas of Europe (HIPOCAS) reproduces observed (TG recorded) sea level better than DAC (residual variance of 70.81 ± 0.69 cm2 versus 74.05 ± 0.68 cm2). This is particularly true in the Atlantic Iberian coasts (49.58 ± 1.09 cm2 versus 68.53 ± 1.12 cm2), where HIPOCAS is able to reproduce a wind-generated signal probably linked with seasonal upwelling. The exception is the northern Adriatic, where HIPOCAS gives higher residual variance than DAC (118.80 ± 0.60 cm2 versus 107.15 ± 0.60 cm2). At low frequencies (T > 20 days) the atmospherically induced coastal sea level is better reproduced by HIPOCAS in the entire domain (23.43 ± 0.34 cm2 versus 32.35 ± 0.33 cm2). At high frequencies (T < 20 days), DAC and HIPOCAS perform on average similarly (37 ± 0.5 cm2). In the open ocean, both corrections provide equivalent results (60 ± 5 cm2 residual altimeter variance). Our general recommendation would be to use either DAC or HIPOCAS for the correction of altimetry, and to use HIPOCAS for coastal studies aiming at separating the atmospheric contribution to sea level variability from the steric and mass contributions.
sea level, satellite altimetry, tide gauge data, barotropic numerical models
0148-0227
C07011
Pascual, Ananda
fde5af8d-b72f-428d-970b-3683ae619975
Marcos, Marta
e9449b6f-834c-4239-8bb7-b611a0062412
Gomis, Damià
422ac23b-8c1f-4dbd-b2d5-35807248c3e8
Pascual, Ananda
fde5af8d-b72f-428d-970b-3683ae619975
Marcos, Marta
e9449b6f-834c-4239-8bb7-b611a0062412
Gomis, Damià
422ac23b-8c1f-4dbd-b2d5-35807248c3e8

Pascual, Ananda, Marcos, Marta and Gomis, Damià (1970) Comparing the sea level response to pressure and wind forcing of two barotropic models: Validation with tide gauge and altimetry data. Journal of Geophysical Research, 113 (C7), C07011. (doi:10.1029/2007JC004459).

Record type: Article

Abstract

The sea level output from two barotropic models, Hindcast of Dynamic Processes of the Ocean and Coastal Areas of Europe (HIPOCAS) and Dynamic Atmospheric Correction (DAC), are compared and evaluated on the basis of coastal tide gauges (TG) and TOPEX/POSEIDON measurements in the Mediterranean Sea and the NE Atlantic Ocean for the period 1993–2001. Both models reduce the observed sea level variance more than the classical inverted barometer correction. However, differences between the models arise for different regions and frequency bands. In coastal areas, Hindcast of Dynamic Processes of the Ocean and Coastal Areas of Europe (HIPOCAS) reproduces observed (TG recorded) sea level better than DAC (residual variance of 70.81 ± 0.69 cm2 versus 74.05 ± 0.68 cm2). This is particularly true in the Atlantic Iberian coasts (49.58 ± 1.09 cm2 versus 68.53 ± 1.12 cm2), where HIPOCAS is able to reproduce a wind-generated signal probably linked with seasonal upwelling. The exception is the northern Adriatic, where HIPOCAS gives higher residual variance than DAC (118.80 ± 0.60 cm2 versus 107.15 ± 0.60 cm2). At low frequencies (T > 20 days) the atmospherically induced coastal sea level is better reproduced by HIPOCAS in the entire domain (23.43 ± 0.34 cm2 versus 32.35 ± 0.33 cm2). At high frequencies (T < 20 days), DAC and HIPOCAS perform on average similarly (37 ± 0.5 cm2). In the open ocean, both corrections provide equivalent results (60 ± 5 cm2 residual altimeter variance). Our general recommendation would be to use either DAC or HIPOCAS for the correction of altimetry, and to use HIPOCAS for coastal studies aiming at separating the atmospheric contribution to sea level variability from the steric and mass contributions.

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More information

Published date: 1 January 1970
Keywords: sea level, satellite altimetry, tide gauge data, barotropic numerical models

Identifiers

Local EPrints ID: 63982
URI: http://eprints.soton.ac.uk/id/eprint/63982
ISSN: 0148-0227
PURE UUID: 2d381584-356b-40f0-822a-e26098f879b0

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Date deposited: 21 Nov 2008
Last modified: 13 Mar 2019 20:23

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Author: Ananda Pascual
Author: Marta Marcos
Author: Damià Gomis

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