Robert C. Beardsley

A Multidisciplinary Amazon Shelf SEDiment Study (AmasSeds): Physical Oceanography Moored Array Component

Abstract : A Multidisciplinary Amazon Shelf SEDiment Study (AmasSeds) is a cooperative research program by geological, chemical, physical, and biological oceanographers from Brazil and the United States to study sedimentary processes occurring over the continental shelf near the mouth of the Amazon River. The physical oceanography component of AmasSeds included a moored array deployed on the continental shelf approximately 300km northwest of the Amazon River mouth near 3.5 deg N. The moored array consisted of a cross-shelf transect of three mooring sites located on the 18-m, 65-m, and 103-m isobaths. The moored array was deployed for approximately 4 months, from early February, 1990 to mid-June, 1990, obtaining time series measurements of current, temperature, conductivity, and wind. This report describes the physical oceanography moored array component and provides a statistical and graphical summary of the moored observations.... moored oceanographic observations, Amazon River/ North Brazil Continental Shelf, AmasSeds(A Multidisciplinary Amazon Shelf SEDiment Study).

The 1995 Georges Bank Stratification Study and moored array measurements

Funding was provided by the National Science Foundation under Grant Numbers OCE-98-06379 and OCE-98-06445.

Nantucket shoals flux experiment (NSFE79) : part 2, moored array data report

The NEFC participation was supported by the NMFS Marine Resources Monitoring, Assessment, and Prediction (MARt-1AP) Program. The U.S. Bureau of Land Management (BLM) supported the USGS field and analysis component under t~emoranda of Understanding M550-MU6-79, M551-MU8- 24, M551-MU9-4, and M551-MU0-18. The WHO! and UNH field programs were supported by the National Science Foundation under Grants OCE 78-19513 and OCE 78-26229.

CTD observations on the North Brazil shelf during a Multidisciplinary Amazon Shelf SEDiment Study (AMASSEDS) : February - March 1990

Abstract : Hydrographic (CTD) and acoustic Doppler current profiler (ADCP) observations were made on the North Brazil shelf adjacent to the mouth of the Amazon River. These observations were obtained during a large-scale survey on Leg 3 in support of geological and geochemical sampling, and during a frontal zone survey on Leg 4 consisting of 14 and 26 hourly CTD casts at anchored stations. The maximum sampling depth at each station was within two meters of the bottom. The primary objectives of the AMASSEDS hydrographic measurement program were (a) to observe and characterize the temperature, salinity, density, oxygen, fluorescence and light transmission fields and their spatial variability on the North Brazilian shelf directly influenced by the Amazon River discharge, (b) to resolve the seaward extent and vertical structure of the surface plume of low salinity Amazon River water during different stages of river discharge, (c) to describe the spatial structure of the turbidity and associated suspended sediment distributions across the shelf, (d) to characterize the properties of the Amazon shelf water beneath the surface plume and their seasonal variability, and (e) to describe the landward penetration of the North Brazil Current with respect of water properties and shelf currents.

CTD observations off Northern California during the Shelf Mixed Layer Experiment, SMILE, February/March 1989

Abstract : CTD observations were made off the northern California coast during R/V Wecoma cruise W8902 February 22 - March 10, 1989 as part of the Shelf MIxed Layer Experiment (SMILE). The surveys consisted of three sampling plans - a large-scale grid of four cross-shelf transects extending to both sides of Point Arena and Point Reyes, a small-scale grid of five cross-shelf transects located near the central SMILE mooring site, and an expanded small-scale grid of nine cross-shelf transects. All of the cross-shelf transects extended beyond the shelf break and the maximum sampling depth at each station was near-bottom or 1000 m. The average along-shelf separation between cross-shelf transects was about 15 km for the small-scale surveys and 50 km for the large- scale grid. The primary objectives of the hydrographic measurement program were to observe and characterize the temperature, salinity, density, and light transmission fields and their temporal and spatial variability in the surface boundary layer along the continental shelf and slope near the SMILE moored array, and to acquire estimates of the cross- and along-shelf scales over which the mixed-layer depth varies. This report presents a summary in graphic and tabular form of the hydrographic observations made during cruise W8902 on the R/V Wecoma.

CTD observations off northern California during the Shelf Mixed Layer Experiment, SMILE, November 1988

Abstract : CTD observations on the R/V Wecoma cruise W8811 were made off the northern California coast November 13-24, 1988 as part of the Shelf Mixed Layer Experiment (SMILE). The survey consisted of repeated mappings of the central transect (C) through the pen SMILE moored array, and two synoptic sampling surveys-a large-scale grid of four cross-shelf transects extending to both sides of point Arena and Point Reyes, and a small-scale grid of five cross-shelf transects located near the central SMILE mooring site. The small-scale hydrographic survey had a much higher spatial resolution of CTD stations than the large-scale survey. The primary objectives of the hydrographic measurement program were to observe and characterize the temperature, salinity, density, and light transmission fields and their temporal and spatial variability in the surface boundary layer along the continental shelf and slope near the SMILE moored array, and to acquire an estimate of the cross-shelf and along-shelf scales over which the mixed-layer depth varies. All of the cross-shelf transects extended beyond the shelf break and the maximum sampling depth at each station was near-bottom or 600 m. This report presents a summary in graphic and tabular form of the hydrographic observations made during cruise W8811 on the R/V Wecoma.

CTD observations in the Great South Channel during the South Channel Ocean Productivity Experiment, SCOPEX, May-June 1989

Abstract : CTD and acoustic Doppler current profiler (ADCP) observations were made in the Great South Channel (GSC) off the New England coast during R/V endeavor cruise EN196 May 18 to June 12, 1989 as part of the South Channel Ocean Productivity EXperiment (SCOPEX). These observations were obtained using several sampling plans -a series of small-scale surveys in support of biological sampling and a large-scale survey of five cross-channel transects extending from Nantucket Shoals and the coast of Cape Cod to Georges Bank. The maximum sampling depth at each station was within a few meters of the bottom. The primary objectives of the hydrographic measurement program were to (a) observe and characterize the temperature, salinity, density, oxygen, fluorescence and light transmission fields and their spatial variability in the Great South Channel off the New England coast, (b) resolve the low salinity surface plume-like structure usually observed east of Cape Cod in late spring, (c) define the front or boundary between the vertically well-mixed water over Nantucket Shoals, the GSC, Georges Bank, and the stratified water in the deeper southwestern Gulf of Maine, and (d) characterize water properties in regions of enhanced biological productivity. This report presents a summary in graphic and tabular form of the hydrographic observations made during cruise EN196 on the R/V Endeavor.

Hydrographic Station Data Obtained in the Vicinity of Georges Bank, May and August, 1976.

Prepared for the United States Geological Survey under Contract No. 14-08-0001-15615 and for· the National Science Foundation under Grant OCE-76-01813 (WHOI).

U.S. GLOBEC Georges Bank Long-Term Moored Program: Part 1 - Mooring Configuration

Funding was provided by the National Science Foundation under grant numbers OCE-93-13670, OCE-96-32348, OCE98-06379, OCE-98-06445 and OCE-02-27679.

Mean Eulerian subsurface currents measured in the Gulf of Maine and adjacent Scotian and New England shelf and slope regions, 1974-1980

Funding was provided by the Department of Interior, Bureau of Land Management under Contract AA 551-MU0-18 and by the National Science Foundation under Grant OCE 80-14941.