Search the data

Arica (Chile) Site History

History Summary

Reference Level

The originators have related the data to tide staff zero which is linked to a fixed set of benchmarks. Specifically, BM #1 (established 1950) is used as a historical datum. However, original data as received from SHOA were adjusted with the SHOA station leveling data as follows.

*Adjustment of shift in reference level deduced from the plot of hourly residuals and from comparison of daily values with Antofagasta and Caldera.

&Based on comparisons with satellite-received data at the University of Hawaii and comparisons among neighboring sites.

These adjustments contains uncertainty of a few centimeters.

Data from 1988-1990 were received with the reference level tied to the BM #1 (1950) while data for other time periods were received without linking the data to BM #1. Thus, the following level adjustments have been applied to the original data based on SHOA geodetic level records.

Quality Assessment by the UH Sea Level Centre

Comment

The daily and monthly values agree well with the nearest station, Antofagasta, and there are no obvious reference level shifts, except that mid-July 1992 to Dec 1992 appears about 5 cm low and 28 July - 27 September 1993 appears about 6 cm high compared with other sites and the satellite-received data for same time period. # below indicates gaps filled with Bubbler data received at the UH Sea Level Center via satellite and $ below refers to gaps filled with Encoder data.