Measurements of the sensitivities and drift of Digiquartz pressure sensors

Wearn, R. B.; Larson, Nordeen

doi:10.1016/0198-0149(82)90064-4

Cited by 53 publications

(37 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pressure was measured every 3 min by a Paroscientific quartz sensor with an accuracy of 0.3 mbar. The largest error comes from instrument drift, resulting in an apparent decrease in pressure by an estimated 0.3 mbar every year [Wearn and Larson, 1982]. The records have not been corrected for drift; however, the error is relatively small compared to the dynamic signal.…”

Section: Pressure Gauge Datamentioning

confidence: 99%

Velocity structure and transport of the Indonesian Throughflow in the major straits restricting flow into the Indian Ocean

Hautala¹,

Sprintall²,

Potemra³

et al. 2001

J. Geophys. Res.

112

View full text Add to dashboard Cite

Abstract. An array of shallow pressure gauge pairs is used to determine shallow geostrophic flow relative to an unknown mean velocity in the five principal straits that separate the eastern Indian Ocean from the interior Indonesian seas (Lombok Strait, Sumba Strait, Ombai Strait, Savu/Dao Straits, and Timor Passage). Repeat transects across the straits over several tidal cycles with a 150-kHz acoustic Doppler current profiler were made during three separate years, and provide a first look at the lateral and vertical structure of the upper throughflow in these straits as well as a means of "leveling" the pressure gauge data to determine the mean shallow velocity and provide transport estimates. We estimate a total 2-year average transport for 1996-1997 through Lombok,

show abstract

Section: Pressure Gauge Datamentioning

confidence: 99%

Velocity structure and transport of the Indonesian Throughflow in the major straits restricting flow into the Indian Ocean

Hautala¹,

Sprintall²,

Potemra³

et al. 2001

J. Geophys. Res.

112

View full text Add to dashboard Cite

show abstract

“…After many field and laboratory experiments (e.g., Wearn and Larson, 1982;Wearn and Paros, 1988;Houston and Paros, 1998) partially conducted by the Scientific Committee on Oceanic Research (SCOR, 1975), the Paros sensor, incorporating the Bourdon tube (Filloux, 1970), was highly improved, and has been called the Digiquartz pressure sensor. The pressure gauges derived from the Paros measurement system have demonstrated good performances for observing tsunamis of the order of millimeters (Filloux, 1982), ocean tides (Mofjeld and Wimbush, 1977), and lowfrequency (<1 day −1 ) oceanic variations of the order of centimeters (Niiler et al, 1993) (in general, a 1-cm seawater height is equivalent to 1 hPa).…”

Section: Introductionmentioning

confidence: 99%

“…The HP sensor, based on the quartz pressure transducer of Karrer and Leach (1969), was investigated by Irish and Snodgrass (1972), SCOR (1975), Culverhouse (1977), Hayes et al (1978), and Wearn and Larson (1982). The Japan Meteorological Agency (JMA) has employed a pressure gauge, derived from the HP measurement system, to a real-time observatory cabled from land for monitoring offshore tsunamis and seafloor level changes (Isozaki et al, 1980).…”

Section: Introductionmentioning

confidence: 99%

Temperature correction and usefulness of ocean bottom pressure data from cabled seafloor observatories around Japan for analyses of tsunamis, ocean tides, and low-frequency geophysical phenomena

Inazu

Hino

2011

Earth Planet Sp

View full text Add to dashboard Cite

Ocean bottom pressure (OBP) data obtained by cabled seafloor observatories deployed around Japan, are known to be significantly affected by temperature changes. This paper examines the relationship between the OBP and temperature records of six OBP gauges in terms of a regression coefficient and lag at a wide range of frequencies. No significant temperature dependency is recognized in secular variations, while substantial increases, at rates of the order of 1 hPa/year, are commonly evident in the OBP records. Strong temperature dependencies are apparent for periods of hours to days, and we correct the OBP data based on the estimated OBP-temperature relationship. At periods longer than days, the temperature corrections work well for extracting geophysical signals for OBP data at a station off Hokkaido (KPG2), while other corrected data show insufficient signal-to-noise ratios. At a tsunami frequency, the correction can reduce OBP fluctuations, due to rapid temperature changes, by as much as millimeters, and is especially effective for data at a station off Shikoku (MPG2) at which rapid temperature changes most frequently occur. A tidal analysis shows that OBP data at a station off Honshu (TM1), and at KPG2, are useful for studies on the long-term variations of tidal constituents.

show abstract

“…We call the linear trend the drift rate of the sensor. Studying the drift of Digiquartz pressure sensors, Wearn and Larson (1982) showed that the drift is smooth, monotonic, reproducible, and reversible. This study suggests that the drift can be accurately estimated ).…”

Section: Instruments and Some Results Of Observationsmentioning

confidence: 99%

Seafloor Geodetic Approaches to Subduction Thrust Earthquakes

Fujimoto¹

2014

Monogr. Environ. Earth Planets

View full text Add to dashboard Cite

Observation systems and some observed results of seafloor geodesy are reviewed with a focus on the research activities of Japanese groups, especially those of Tohoku University. Seafloor acoustic ranging has been adopted as the simplest way to continuously monitor local crustal activities. The GPS-Acoustic (GPSA) method has been the most important for seafloor positioning. It seems that commercial technologies can be used to lessen the considerable differences in repeatability and spatio-temporal resolution of GPSA and land based GPS. Ocean bottom pressure sensors have been used to continuously monitor vertical crustal movements. Improvements in the resolution and long-term stability of pressure sensors will lead to monitoring slow slip events and interplate locking. Ocean bottom and underwater gravimeters have been developed for precise gravity mapping and monitoring mass change beneath the seafloor. The 2011 Tohoku-oki earthquake is an historical event demonstrating that seafloor geodetic observations are crucial to understanding the mechanism of giant earthquakes. Coseismic displacements detected through geodetic observations on the seafloor have indicated huge slips on the shallow part of the plate boundary. A slow slip event near the zone of the coseismic slip preceding the main event has been detected from slight pressure variations. This illustrates the importance of real-time monitoring with a cabled seafloor observatory, which is also a key to establishing a reliable early tsunami warning system.

show abstract

Measurements of the sensitivities and drift of Digiquartz pressure sensors

Cited by 53 publications

References 11 publications

Velocity structure and transport of the Indonesian Throughflow in the major straits restricting flow into the Indian Ocean

Velocity structure and transport of the Indonesian Throughflow in the major straits restricting flow into the Indian Ocean

Temperature correction and usefulness of ocean bottom pressure data from cabled seafloor observatories around Japan for analyses of tsunamis, ocean tides, and low-frequency geophysical phenomena

Seafloor Geodetic Approaches to Subduction Thrust Earthquakes

Contact Info

Product

Resources

About