A study of the bottom boundary layer over the Eastward Scarp of the Bermuda Rise

Velocity and temperature measurements from the bottom boundary layer (BBL) over the Eastward Scarp of the Bermuda Rise in water depth of 4620 m show little variability over an 8‐month period. The free‐stream flow 62 m above the bottom was south‐southeasterly following the isobaths in the region with an average speed of 22 cm/s. The current vector in the BBL rotated an average of 5° in a counterclockwise sense between 62 and 0.8 m above the bottom. The thickness of the BBL was ∼40 m and the average magnitude of the bottom stress was ∼0.7 dynes/cm2. Mean speed profiles, height of the BBL, and the magnitude of the bottom stress predicted by a model compare favorably with the observations, but the model predicts a rotation of the current vector between 62 and 0.8 m more than twice that measured. The time‐dependent nature of the flow field is also reproduced by the model. The Bermuda Rise data and speed profile measurements at the base of the Scotian Rise show that the M2 clockwise polarized tide is damped more than the mean current as the bottom is approached in the BBL. This phenomenon is reproduced by the model and can be explained by differing effective Ekman layer thicknesses associated with tidal and steady components of the flow

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http://archive.org/details/determinationofc00gallN

Hydrographic data from the OPTOMA program OPTOMA21 7 - 20 July 1986

The OPTOMA (Ocean Prediction Through Observation, Modeling and Analysis) program, a joint NPS/Harvard program sponsored by ONR, seeks to understand the mesoscale (fronts, eddies, and jets) variability and dynamics of the California current systems and to determine the scientific limits to practical mesoscale ocean forecasting. To help carry out the aims of this project a series of cruises has been planned two subdomains, nocal and cencal. Optoma21 was a multidisciplinary study which took place from 7 to 20 July 1986 aboard the R/V Point Sur in the nocal domain. In addition to conducting a quasi- synoptic CTD/XBT mapping of a cool anomaly, meandering jet, and eddy system, measurements were made to determine: 1) the fine scale variability of the upper ocean mass and velocity fields; 2) the upper ocean nutrient, optical and phytoplankton fields; and 3) the structure of the zooplankton population. In this report, the CTD/XBT data are presentedresearch project "Ocean Prediction Through Observation, Modeling and Analysis" sponsored by the Physical Oceanography Program of the Office of Naval Research under Program Element 61153N.http://archive.org/details/hydrographicda20jul86wittN000146WR24027NAApproved for public release; distribution is unlimited

Hydrographic data from the OPTOMA program OPTOMA20 OPTOMA20 P 16 March 1986 OPTOMA20 Leg MI 24 March - 3 April 1986 OPTOMA20 Leg MII 7 - 15 April 1986 OPTOMA20 Leg D 25 April - 6 May 1986

THe OPTOMA (Ocean Prediction Through Observation, Modeling, and Analysis) Program a joint NPS/Harvard program sponsored by ONR, seeks to understand the mesoscale (fronts, eddies, and jets) variability and dynamics of the California Current System and to determine the scientific limits to practical mesoscale ocean forecasting. To help carry out the aims of this project, a series of cruises has been planned in two subdomains, NOCAL and CENCAL, Three cruises were undertaken during March, April and May 1986: two (Legs Ml and Mll) on the NOAA ship Mc AUTHOR, one (Leg D) on the USNS DE STEIGUER. In addition, one P-3 overflight (Leg P) was made one week before the first cruise. Leg P, on 16 March, sampled a domain approximately 240km square centered about 280 km off the coast between Pt. Arena and Cape Mendocino, with additional transects from and to San Francisco, Leg Ml was carried out from 24 March to 3 April (Figure 8), Leg Mll from 7 to 15 April (Figure 20), and Leg D from 25 April to 6 May (Figure 32). Each cruise sampled the same domain as Leg P. On these cruises, oceanographic stations were occupied at approximately 18km along each trackPrepared for: Office of Naval Research Environmental Sciences Directoratehttp://archive.org/details/hydrographicdata008cianN0001486WR24027NAApproved for public release; distribution is unlimited

Hydrographic data from the OPTOMA Program: OPTOMA12, 8-18 October 1984, OPTOMA13, 22 October-3 November 1984, OPTOMA13P, 27 October 1984, OPTOMA14, 3-14 November 1984

The three cruises, OPTOMA12, OPTOMA13, and 0PT0MA14, and one AXBT flight, 0PT0MA13P, were under taken in October and November, 1984. This report presents the hydrographic data, acquired by XBT, AXBT and CTD casts, from the cruises and the flight."Ocean Prediction Through Observations, Modeling and Analysis" sponsored by the Physical Oceanography Program of the Office of Naval Research under Program Element 61153N.http://archive.org/details/hydrographicdata012wittN0001484NR24501NAApproved for public release; distribution is unlimited

Hydrographic data from the OPTOMA Program: OPTOMA11, 5-June-5 August, 1984

The six cruises and one aircraft flight comprising OPTOMA11 were undertaken in June, July and August 1984 to sample two subdomains of the California Current. This report presents the hydrographic data, acquired by XBT, AXBT and CTD casts, from the cruises and the flight.Research project "Ocean Prediction Through Observations, Modeling and Analysis" sponsored by the Physical Oceanography Program of the Office of Naval Research under Program Element 61153N.http://archive.org/details/hydrographicdata011wittN000148WR24051NAApproved for public release; distribution is unlimited

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http://archive.org/details/derivingcorrecti00elsbN

Hydrographic data from the OPTOMA program OPTOMA22 27 July - 5 August 1986

The OPTOMA (Ocean Prediction Through Observation, Modeling and Analysis) Program, a joint NPS/Harvard program sponsored by ONR, seeks to understand the mesoscale (fronts, eddies, and jets) variability and dynamics of the California Current System and to determine the scientific limits to practical mesoscale ocean forecasting. To help carry out the aims of this project, a series of cruises has been planned in two subdomains, NOCAL and CENCAL. The cruise, OPTOMA22, was undertaken during the period 27 July to 5 August 1986, on the USNS De STEIGUER, and sampled a domain approximately 240km square centered about 280km off the coast between Pt. Arena and Cape Mendocino. Oceanographic stations were occupied during the period 27 July to 5 August at approximately 18km along each trackOffice of Naval Researchhttp://archive.org/details/hydrographicdata5augcianN000146WR24027NAApproved for public release; distribution is unlimited

Hydrographic data from the slope waters off central California : 26 November 1978 - 26 June 1980 /

This report presents hydrographic data acquired by STD casts from the period November, 1978 through June, 1980 from the slope waters off central California.Minerals Management Service, Department of the Interiorhttp://archive.org/details/hydrographicdata010birdNAApproved for public release; distribution is unlimited