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Transient thermal response in ocean bottom pressure measurement
Author(s) -
Hirata Kenji,
Baba Toshitaka
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl026084
Subject(s) - transient (computer programming) , submarine pipeline , geology , thermal , pressure measurement , ocean bottom , transient response , sea surface temperature , temperature measurement , mechanics , seismology , meteorology , climatology , oceanography , thermodynamics , physics , engineering , computer science , electrical engineering , operating system
Offshore ocean bottom pressures usually follow ocean tidal motion but sometimes deviate from it even when no tsunami occurs. Numerous observations suggest that such deviations highly correlate with sudden temperature changes, probably due to irregular deep ocean currents, around the pressure gauges regardless of static temperature compensation mechanism. We ascribe this deviation to the transient thermal response of the pressure gauges, which produce apparent pressure fluctuations when temperature change quickly so that temperature equilibrium condition of two quartz transducers is not valid. We put forward an empirical method to estimate the transient thermal response correctly. Such rapid temperature change may have to be corrected for a robust tsunami warning based on offshore tsunami observation with pressure gauges.