NDLI: Comparisons of sea surface height variability observed by pressure-recording inverted echo sounders and satellite altimetry in the Kuroshio Extension

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Comparisons of sea surface height variability observed by pressure-recording inverted echo sounders and satellite altimetry in the Kuroshio Extension

Content Provider	Springer Nature Link
Author	Park, Jae Hun Watts, D. Randolph Dohue, Kathleen A. Tracey, Karen L.
Copyright Year	2012
Abstract	Satellite-measured along-track and gridded sea surface height (SSH) anomaly products from AVISO are compared with in situ SSH anomaly measurements from an array of 43 pressure-recording inverted echo sounders (PIESs) in the Kuroshio Extension. PIESs measure bottom pressure (P $_{bot}$) and round-trip acoustic travel time from the sea floor to the sea surface (τ). The P $_{bot}$ and τ measurements are used to estimate, respectively, the mass-loading and steric height variations in SSH anomaly. All comparisons are made after accurate removal of tidal components from all data. Overall good correlations are found between along-track and PIES-derived SSH anomalies with mean correlation coefficient of 0.97. Comparisons between the two measurements reveal that the mass-loading component estimated from P $_{bot}$ is relatively small in this geographical region. It improves regression coefficients about 5 % and decreases mean root-mean-squared (rms) differences from 7.8 to 6.4 cm. The AVISO up-to-date gridded product, which merges all available satellite measurements of Jason-1, Envisat, Geosat Follow-On, and TOPEX/Poseidon interlaced, shows better correlations and smaller rms differences than the AVISO reference gridded product, which merges only Jason-1 and Envisat. Especially, the up-to-date gridded product reveals 6.8 cm rms improvement on average at sites away from Jason-1 ground tracks. Gridded products exhibit low correlation (0.75–0.9) with PIES-derived SSH in a subregion where the SSH fluctuations have relatively high energy at periods shorter than 20 days.
Starting Page	401
Ending Page	416
Page Count	16
File Format	PDF
ISSN	09168370
Journal	Journal of Oceanography
Volume Number	68
Issue Number	3
e-ISSN	1573868X
Language	English
Publisher	Springer Japan
Publisher Date	2012-05-05
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sea surface height Pressure-recording inverted echo sounder (PIES) Satellite altimetry Kuroshio Extension Acoustic echo time Ocean bottom pressure Freshwater & Marine Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography

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