Toole
John M.
Toole
John M.
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Technical ReportHydrographic observations from the US/PRC Cooperative Program in the Western Equatorial Pacific Ocean, cruises 5-8(Woods Hole Oceanographic Institution, 1991-07) Lake, B. J. ; Yang, K. ; Luizhi, Z. ; Millard, Robert C. ; Pu, S. ; Toole, John M. ; Wang, Z. ; Mangum, Linda J.In support of the Tropical Ocean and Global Atmosphere (TOGA) program, investigators from the Woods Hole Oceanographic Institution (WHOI), NOAA Pacific Marine Environmental Laboratory (PMEL), and the State Oceanic Administration (SOA) from both Qingdao (First Institute) and Guangzhou (South China Sea Branch) conducted hydrographic observations aboard the Chinese R/V Xiang Yang Hong 14 in the western equatorial Pacific Ocean. The objective of this component of the TOGA program was to document the water mass property distributions of the western equatorial Pacific and describe the oceanic velocity field. The four cruises summarized here were conducted during the period November 1988 to July 1990 and are the final half of an eight cruise repeated survey of the region begun in 1985. Conductivity-Temperature-Depth-Oxygen (CTD/O2) stations were collected to a minimum cast depth of 2500m or the bottom when shallower. The cruises reoccupied the same stations to provide temporal information. Summarized listings of CTD/02 data together with selected physical properties of sea water for these cruises are provided here, as well as a description of the hardware used and an explanation of the data reduction techniques employed.
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Technical ReportFine- and microstructure observations at Fieberling Guyot : R/V New Horizon cruise report(Woods Hole Oceanographic Institution, 1993-11) Montgomery, Ellyn T. ; Toole, John M.This report describes fine- and microstructure profile data taken on a cruise to Fieberling Guyot, a seamount in the northeast subtropical Pacific Ocean. The work performed at sea, instruments used, data return and processing procedures will be summarized here. This cruise took place between March 4 and March 28, 1991 on the R/V New Horizon. and was part of the interdisciplinary Accelerated Research Initiative (ARI) for Abrupt Topography sponsored by the Office of Naval Research. An overall goal of the ARI was to understand the physical, biological, and geological processes occurring near a seamount. The scientific objective of the Seamount Mixing Cruise was to collect data describing the oceanic fine-scale velocity and density fields, as well as the related turbulence and mixing in the vicinity of the seamount. The High Resolution Profiler (HRP) was deployed 95 times above and around the seamount. As well, two test dives were conducted on the way to the site, and eight deployments completed in deep basdins off the southern California coast before returning to port. The near-synoptic surveys of the seamount were completed with the deployment of 128 Expendable Current Profilers (XCP's). The temperature field of the upper 760 meters of water within a 50 kilometer radius of the seamount was mapped using 144 Expendable Bathythermographs (XBT's).
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Technical ReportDesign and operation of automated ice-tethered profilers for real-time seawater observations in the polar oceans(Woods Hole Oceanographic Institution, 2006-06) Krishfield, Richard A. ; Doherty, Kenneth W. ; Frye, Daniel E. ; Hammar, Terence R. ; Kemp, John N. ; Peters, Donald B. ; Proshutinsky, Andrey ; Toole, John M. ; von der Heydt, KeithAn automated, easily-deployed Ice-Tethered Profiler (ITP) has been developed for deployment on perennial sea ice in polar oceans to measure changes in upper ocean temperature and salinity in all seasons. The ITP system consists of three components: a surface instrument that sits atop an ice floe, a weighted, plastic-jacketed wire-rope tether of arbitrary length (up to 800 m) suspended from the surface instrument, and an instrumented underwater unit that profiles up and down the wire tether. The profiling underwater unit is similar in shape and dimension to an ARGO float except that the float's variable-buoyancy system is replaced with a traction drive unit. Deployment of ITPs may be conducted either from ice caps or icebreakers, utilizing a self contained tripod/winch system that requires no power. Careful selection of an appropriate multiyear ice floe is needed to prolong the lifetime of the system (up to 3 years depending on the profiling schedule). Shortly after deployment, each ITP begins profiling the water column at its programmed sampling interval. After each acquired temperature and salinity profile, the underwater unit (PROCON) transfers the data and engineering files using an inductive modem to the surface controller (SURFCON). SURFCON also accumulates battery voltages, buoy temperature, and locations from GPS at specified intervals in status files, and queues that information for transmission at the start of each new day. At frequent intervals, an Iridium satellite transceiver in the surface package calls and transmits queued status and CTD data files onto a WHOI logger computer, which are subsequently processed and displayed in near-real time at http://www.whoi.edu/itp. In 2004 and 2005, three ITP prototypes were deployed in the Arctic Ocean. Each system was programmed with accelerated sampling schedules of multiple one-way traverses per day between 10 and 750-760 m depth in order to quickly evaluate endurance and component fatigue. Two of the ITPs are continuing to function after more than 10 months and 1200 profiles. Larger motor currents are observed at times of fast ice floe motion when larger wire angles develop and drag forces on the profiler are increased. The CTD profile data so far obtained document interesting spatial variations in the major water masses of the Beaufort Gyre, show the double-diffusive thermohaline staircase that lies above the warm, salty Atlantic layer, and many mesoscale eddys. Deployed together with CRREL Ice Mass Balance (IMB) buoys, these ITP systems also operate as part of an Ice Based Observatory (IBO). Data returned from an array of IBOs within an Arctic Observing Network will provide valuable real time observations, support studies of ocean processes, and facilitate numerical model initialization and validation.
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Technical ReportA trans-Indian Ocean hydrographic section at latitude 32°South : data report of RRS Charles Darwin cruise #29(Woods Hole Oceanographic Institution, 1992-01) Cook, Margaret F. ; Toole, John M. ; Knapp, George P. ; Fine, Rana A. ; Top, Zafer ; Jennings, Joe C.A trans-Indian Ocean hydrographic section employing CTD/O2 profilers was conducted between Africa and Australia during austral spring 1987. The cruise track ranged between 29°S and 34°S; the average latitude of the crossing was 32°S. The purpose of the cruise was to explore various aspects of the South Indian Ocean including the characteristics of the core water masses of this ocean, the strength of the subtropical gyre, the structure and transport of deep western-boundary currents, and the net meridional heat flux. A total of 109 CTD/O2 profiles with associated rosette water sample measurements and 347 XBT profiles were collected, supplemented by underway upper ocean velocity, bathymetric and sea surface temperature and salinity data. This report detals the data collection, calibration, and reduction methods, and summarizes the hydrographic observations.
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Technical ReportObservations of the Antarctic polar front during FDRAKE 76 : a cruise report(Woods Hole Oceanographic Institution, 1976-11) Joyce, Terrence M. ; Dean, Jerome P. ; McCartney, Michael S. ; Millard, Robert C. ; Moller, Donald A. ; Voorhis, A. ; Dahm, C. ; Georgi, Daniel T. ; Kullenberg, G. ; Toole, John M. ; Zenk, WalterDuring March/April 1976 the small-scale structure of the Antarctic Polar Front was observed in the Drake Passage. The observations were part of the International Southern Ocean Studies (ISOS) program called FDRAke 76. The purpose of the program was to obtain densely sampled measurements of temperature, salinity, dissolved oxygen, and chemical nutrients in the Polar Front Zone (PFZ) and pilot measurements of horizontal and vertical velocities in order to explain the above scalar variability. The PFZ is a region where Antarctic and sub-Antarctic waters intermingle and presumably mix to affect the properties of Antarctic Intermediate Water. A report on the third leg of Cruise 107 of the R. V. THOMPSON is presented as well as a description of the measurements and a preliminary report of the data. A feature of interest is the pinching off of a northward meander of the circumpolar current system into a cyclonic ring of Antarctic Waters.
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Technical ReportUS/PRC CTD intercalibration report 1986-1990(Woods Hole Oceanographic Institution, 1990-12) Millard, Robert C. ; Lake, B. J. ; Brown, Neil L. ; Toole, John M. ; Schaaf, D. ; Yang, K. ; Yu, H. ; Zhao, L.A series of laboratory intercalibrations of a CTD system were undertaken between 1986 and 1990 as part of cooperative research program between the United States (US) and People's Republic of China (PRC). A comparison of US and PRC calibration facility standards is carried out using a NBIS/EG&G Marine Instruments Mark IIIb CTD system as a "quasi-transfer standard." When compared with the quoted accuracy of the calibration facilities, pressure was found to be more accurate and temperatue was about as accurate as stated. The conductivity standard differences between facilities are difficult to assess because of the CTD conductivity sensor drift.
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Technical ReportMoored current meter, AVHRR, CTD, and drifter data from the Agulhas Current and Retroflexion region (1985-1987) Volume XLII(Woods Hole Oceanographic Institution, 1990-07) Luyten, James R. ; Spencer, A. ; Tarbell, Susan A. ; Luetkemeyer, Kelly ; Flament, P. ; Toole, John M. ; Francis, M. ; Bennett, Sara L.Data are presented from an experiment designed to explore the spatial and temporal structure of the Agulhas Current and Retroflexion by direct means. Included are the current meter results from 10 moorings in the Retroflexion region, CTD stations occupied on the deployment cruise in 1985, data from satellite tracked (ARGOS) freely during surface buoys and numerous images of the sea surface temperature.
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Technical ReportHydrographic observations from the US/PRC Cooperative Program in the Western Equatorial Pacific Ocean, cruises 1-4(Woods Hole Oceanographic Institution, 1990-01) Cook, Margaret F. ; Mangum, Linda J. ; Millard, Robert C. ; LaMontagne, G. ; Pu, S. ; Toole, John M. ; Wang, Z. ; Yang, K. ; Zhao, L.In support of the Tropical Oceans and Global Atmosphere (TOGA) program, investigators from Woods Hole Oceanographic Institution (WHOI), NOAA Pacific Marine Envionmental Laboratory and the State Oceanic Administration (SOA) from both Qingdao (First Institute) and Guangzhou (South China Sea Branch) conducted hydrographic observations aboard the Chinese Research vessels Xiang Yang Hong 5 and Xiang Yang Hong 14 in the western equatorial Pacific. The objective of this component of the TOGA program was to document the water mass property distributions of the western equatorial Pacific Ocean and describe the oceanic velocity field. The four cruises summarized here were conducted during the period November 1985 to June 1988 and are the first half of an eight cruise repeated survey of the region scheduled to be completed in spring 1990. Conductivity-Temperatue-Depth-Oxygen (CTD/02) stations were collected to a minimum cast depth of 2,500 m or the bottom when shallower. The cruises reoccupied the same stations to provide temporal information. Summarized listings of CTD/O2 data together with selected physical properties of sea water for these cruises are provided here, as well as a description of the hardware used and an explanation of the data reduction tehniques employed.