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Site History : Fortaleza, Brazil

History Summary

Station Name Fortaleza
Country Brazil
Latitude 03° 43.0' S
Longitude 038° 28.0' W
Time Reference GMT (00-23 hours)
WOCE No. 9107
Contributor University of Hawaii Sea Level Center
1000 Pope Rd. MSB 317
Honolulu, Hawaii 96822
Originator LPAO/INPE Oceanografia
Av. Dos Astronautas 1758
Sao Jose Dos Campos
Instrument Type Aanderaa, WLR-7 pressure gauge.
Observational Period 1995-1998

Instrument Note

This data set is not 'sea level' as measured by conventional instruments.

This bottom-mounted pressure gauge measures the column of water and air above it. The weight of the air is not measured and thus it is included in the final series.

The conversion from pressure units to height for the water column uses a measured temperature and an assumed constant salinity of 37 psu with gravity at 9.81 m/s 2 ; for the density estimation.

Tide Gauge Benchmark Description

Site is on Petrobras Pier.

Auxiliary Benchmarks

Not available at present.

Benchmark Relationships

Not available at present.

Datum Information

The data have been linked to tide gauge zero.


Period Parameters CI% Sample interval
1995 ASLVZZ01 11 60 minutes
1996 ASLVZZ01 100 60 minutes
1997 ASLVZZ01 100 60 minutes
1998 ASLVZZ01 24 60 minutes


ASLVZZ01 = Sea Level (metres)

Quality Assessment

All data have been compared with the current Harmonic Constants Library, and residuals checked. Records have been visually inspected for spikes, datum shifts and timing errors.

Period Parameter Missing data Suspect data
1995 ASLVZZ01 001-328 None
1996 ASLVZZ01 None None
1997 ASLVZZ01 None 331-338,358-365
1998 ASLVZZ01 087-365 Small scale timing errors throughout