Data report for current meters on mooring CMMW-10, 1982-83 study area W-N. Low Level Waste Ocean Disposal Program, Report OSU-21

Technical Report · Sun Jun 01 04:00:00 EDT 1986

OSTI ID:5486629

Pillsbury, R D; Barstow, D; Bottero, J; Pittock, G; Root, D C; Seifert, E A; Heath, G R

A series of moorings was designed to determine the long-term mean flow in the study area and has been deployed in the W-N study area since 1979. The data collected will be used as input in a numerical circulation model of the region. In addition the long time series of data will allow the study of energetic fluctuations at low frequencies. Mooring CMMW-10 was installed on cruise W8209A-II aboard the R/V WECOMA in September 1982. It was recovered on cruise W8309A aboard the R/V WECOMA 12 months later in September 1983. This mooring was designed to give data about the general flow in the study region and to continue the data set being collected from the ''central'' series of W-N moorings. This mooring contained a Vector Measuring Current Meter (VMCM) at 615 m. It was the first use of this instrument on a year-long mooring by Oregon State. The data from that instrument can be compared with that from an Aanderaa RCM 5 moored at 600 m. The two data sets compare quite well in general, though there are some specific differences. The VMCM recorded speeds of <0.9 cm/sec 14% of the time. The published VMCM threshold is 0.9 cm/sec and these low speeds may be a problem to interpret correctly in terms of how the ocean was actually moving. In the simple case where the VMCM records no component velocities i.e., u = 0 cm/sec and v = 0 cm/sec for the sample interval, the current direction is set equal to 0/sup 0/. This is probably not the actual direction of the water flow which is 0.9 cm/sec or less in speed. When the instrument was recovered end-play for both rotor shafts was considerably above the tolerance recommended by the manufacturer. This may have affected the rotor response.

• Research Organization: Oregon State Univ., Corvallis (USA). School of Oceanography
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5486629
• Report Number(s): SAND-85-7227; ON: DE86013670
• Country of Publication: United States
• Language: English

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