A First Comparison of Simultaneous Sea Level Measurements from Envisat, GFO, Jason-1, and TOPEX/Poseidon

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ID: 111011
2006
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Abstract
The multiple altimeter missions have not only advanced our knowledge of oceancirculation, ice sheet topography, and global climate, but also improved the accuracy ofaltimetric measurements by cross-calibration and validation. In this paper, one year’ssimultaneous maps of sea level anomaly (MSLA) data obtained from four altimeters,Envisat, Geosat Follow-On (GFO), Jason-1, and TOPEX/Poseidon (T/P), have beencompiled for a preliminary comparison. First, the discrepancy in global geographicaldistribution of each product relative to the merged MSLA field is analyzed and its signalretrieval capability is discussed. Second, the space/time variability of each discrepancy inthe Atlantic Ocean, Indian Ocean, Pacific Ocean, Northern Hemisphere, SouthernHemisphere, and global ocean is studied. Third, each discrepancy as a function of latitude,longitude, and merged MSLA is presented. The results show that Jason-1 is the best single-mission for mapping large scale sea level variation, while T/P in its new orbit presents thepoorest estimation of SLA due to the short period (from cycle 369 to 403) used to determinethe mean profile. A clear understanding of each product discrepancy is necessary for ameaningful combination or merging of multi-altimeter data, optimal product selection, aswell as for their assimilation into numerical models.
Reference Key
zhang2006sensorsa Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Caiyun Zhang;Ge Chen;Zhang, Caiyun;Chen, Ge;
Journal sensors
Year 2006
DOI
10.3390/s6030235
URL
https://www.mdpi.com/1424-8220/6/3/235
Keywords
sea level anomaly altimeter data comparison.

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