We review the MODE deployment of IGPP bottom instruments, together with preliminary tests on the Pacific seafloor and in the laboratory. Pressure and temperature were measured with quartz-crystal transducers in different configurations. Spectra of instrument noise in the laboratory and on the seafloor were estimated from duplicate transducers. These estimates are prerequisite to the forthcoming discussions of MODE tides, the bottom experiment, and internal waves. There are two puzzling features: (i) the temperature noise continuum on the seafloor is generally 20 dB above that in the laboratory, and (ii) the pressure noise spectrum has a tidal line structure. Instrument drifts during MODE are of the order of a few millibars and a millidegree Celcius, respectively.
Journal of Physical Oceanography
American Meteorological Society
Digital Object Identifier (DOI)
Snodgrass, F., W. Brown and W. Munk. 1975. MODE: IGPP measurements of bottom pressure and temperature. Journal of Physical Oceanography 5:63-74