Montgomery Ellyn T.

Last Name

Montgomery

First Name

Ellyn T.

ORCID

0000-0002-9354-4220

Full item page

Search Results

Now showing 1 - 18 of 18

Fine- 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).
The surface acoustic shear sensor (SASS) as used during the Shelf Mixed Layer Experiment (SMILE) November 1988-March 1989

(Woods Hole Oceanographic Institution, 1989-07) Montgomery, Ellyn T. ; Santala, Markku J.

The SMILE (Shelf Mixed Layer Experiment) field program took place during the winter of 1988-1989. The SMILE program itself was large and involved many investigators and instruments. This report documents the use of the Surface Acoustic Shear Sensor (SASS) as part of the suite of measurements taken during SMILE. The SMILE mooring array was deployed from early November 1988 until June, 1989. SASS, being a newly developed instrument, was deployed for two shorter periods; a test deployment between November 26 and December 8, 1988, and a longer second deployment, February 23 through March 14, 1989. SASS is based on BASS (Benthic Acoustic Stress Sensor) components (Williams et al., 1987), mounted on a structure that allowed continuous sampling of velocity, temperature and conductivity in the top five meters of the ocean. BASS was modified for this surface application to acquire data from a gyro, and conductivity sensors. The attitude data from the gyro allows the velocities of the current meter to be referenced to an inertial frame of reference. The other data obtained from SASS will be used to calculate shear current gradients, and other descriptors of turbulence and mixing.
Richardson number (RiNo) float operations during the Patch Experiment (PATCHEX), and data summary

(Woods Hole Oceanographic Institution, 1988-11) Montgomery, Ellyn T.

The Patch Experiment (PATCHEX) was a multi-ship experiment that took place in the area near 34 N, 127 W, between 8 and 27 October, 1986. The ships used in the experiment and their chief scientific objectives were the following: R/V THOMPSON, AMP (Advanced Microstructure Profiler) and MSP (micro-structure profiler) drops; USNS DESTEIGUER, ADCP (Acoustic Doppler current Profiler), seasoar and RiNo (Richardson Number) f loat operations; R/V POINT SUR, ADCP and towed fish; and FLIP, Acoustic Doppler and CTD profiling. This report describes the RiNo operations carried out on the USNS DESTEIGUER. Topics discussed include the RiNo float, the sensors used, how it was tracked, some of the preliminary results, and a log of the relevant parts of USNS DESTEIGUER Cruise #84.
R/V Seward Johnson cruise report (SJ-9807), ACCE S-PALACE float deployments

(Woods Hole Oceanographic Institution, 1999-02) Montgomery, Ellyn T. ; Guest, Brian J.

R/V Seward Johnson cruise 98-07 occurred between October 12 and November 5, 1998. The goal of the cruise was to deploy 30 Salinity Profiling Autonomous Lagrangian Current Explorer (S-PALACE) floats in the tropical Atlantic as part of the Atlantic Circulation and Climate Experiment (ACCE). These floats are neutrally buoyant and drift with the water in which they are deployed. They are programmed to obtain temperature and salinity profiles of the top 1000 meters of the ocean every ten days. To ascertain the validity of the float data, a CTD profile was made at the site and time of deployment of each float. The data from these floats augments data already being obtained from ten floats deployed last year. Given 40 floats in the tropical North Atlantic, reporting every 10 to 14 days with an expected operational life of 3-5 years, we hope to gather 5000 to 7000 profiles from these floats in the coming years. The temperature and salinity profiles, along with derived properties will aid in examining the mechanisms of upper ocean heat and freshwater storage. This data, combined with satellite sea surface should provide useful input to climate and weather prediction models.
Use of the High Resolution Profiler (HRP) in the Salt Finger Tracer Release Experiment (SFTRE)

(Woods Hole Oceanographic Institution, 2002-07) Montgomery, Ellyn T.

The Salt Finger Tracer Release Experiment (SFTRE) was conducted in the tropical North Atlantic in 2001. The experimental area was east of Barbados and is characterized by thermohaline staircase features prevalent in the depth range of 200−600 meters. The goal of this experiment was to quantify the distribution and intensity of vertical mixing in a region of thermohaline staircases. Two cruises were required to accomplish this goal: one to survey with the High Resolution Profiler (HRP) and inject sulfur hexafluoride (SF6) tracer, and another ten months later to map the spatial distribution of tracer and obtain additional estimates of diffusive and turbulent mixing rates using the HRP. The first cruise of the SFTRE experiment took place between January 15 and February 12, 2001 on the R/V Oceanus, leg 365-2 (OC365). An XBT survey identified an area of robust staircases that became the injection site. Then 175 kg of SF6 tracer was injected in nine streaks in a layer with temperature of about 10°C. When the injection mechanism was being replenished, HRP profiles were made in the area of the tracer patch. The profiles yielded estimates of the mixing rates at the start of the experiment. Near the end of the cruise, water samples from the patch were used to map the actual tracer distribution immediately after deployment. The second cruise occurred between October 29 and December 4 on the R/V Seward Johnson, leg 01−12 (SJ0112). Its objective was to sample and map the vertical and horizontal distribution of tracer after ten months. The work completed included 172 CTD casts with chemical analysis performed on the water samples, and 165 HRP profiles. Despite covering an area of 500,000 nautical miles², only 50−60% of the tracer was found, suggesting higher than expected lateral mixing. The SFTRE included the deployment of a Moored Profiler. The profiles acquired by the MP provide background on the temporal variation of the temperature, salinity, and velocity fields where it was deployed. To share costs of personnel, the MP was deployed and recovered on cruises that followed ours, in conjunction with other mooring activities. The MP was deployed in February 2001 from R/V Oceanus and recovered by the R/V Knorr in April 2002. The program was a success, despite not fully delimiting the tracer distribution, because the observations allow more complete quantification of the mixing processes occurring in this region. The inferred mixing intensity was stronger and the influence of the thermohaline staircases more widespread than initially expected.
High resolution profiler study of deep mixing in the Romanche fracture zone

(Woods Hole Oceanographic Institution, 1996-10) Montgomery, Ellyn T.

Between November 20 and December 10, 1994, studies of the deep mixing processes in the Romanche Fracture Zone (RFZ) of the Mid-Atlantic Ridge were conducted from the French research vessel N/O le Noroit. Oceanographers from France and the U.S. worked together to acquire the unique data obtained on this expedition. The cruise departed from and returned to Dakar, Senegal. Prior to the work in the RFZ, a sediment trap was recovered and returned to port. Two HRP engineering test dives were completed on the way to the fracture zone. The next week and a half was spent profiling with the HRP and CTD along the channel of the RFZ to identify regions of especially intense mixing. After that, two trans-equatorial sections were done with the HRP to examine the structure and intensity of the equatorial jets. The presence of bottom intensified flow to the east along the RFZ and enhanced mixing of Antarctic Bottom Water were both observed. Based on the measurements obtained during this experiment, transport through the RFZ is estimated to be 1 Sv. The work at sea, instrumentation, data return and some preliminary results are presented in this report.
Dynamic presentation of Long Term Upper Ocean Study (LOTUS) data using videotape

(Woods Hole Oceanographic Institution, 1986-09) Montgomery, Ellyn T.

In order to show efficiently the large amount of data obtained during the Long Term Upper Ocean Study (LOTUS), a new method of data presentation was developed. Three data variables can be included in a simple color contour plot, but if successive color contour plots are recorded on videotape, a fourth variable, time, can also be shown. This report documents the process of making a videotape presenting scientific data in this way, from raw data to finished videotape. The videotape shows internal wave kinetic energy versus frequency and depth; the time variation of the videotape displays real time variation in the ratio of 14/30 second to one week, or about l month of data every 2 seconds.
A graphical user interface for processing data from the high resolution profiler (HRP)

(Woods Hole Oceanographic Institution, 1998-03) Montgomery, Ellyn T. ; Bolmer, S. Thompson

The High Resolution Profiler (HRP) is one of the only oceanographic instruments that is capable of measuring turbulent velocity and temperature fluctuations in the abyssal ocean. It is a unique device, and consequently specialized communications, data conversion and analysis software are employed to examine the data it collects. This document describes a major upgrade of the software and hardware systems used to process data from the HRP. The bulk of the conversion occurred in 1996 prior to the Brazil Basin Tracer Release Experiment (BBTRE). During the upgrade process, a Graphical User Interface (GUI) was designed and implemented for accomplishing routine HRP data processing tasks.
Report on Sediment Transport Events on Shelf and Slope (STRESS) field season 1 : Winter 1988-1989 Benthic Acoustic Stress Sensor (BASS)

(Woods Hole Oceanographic Institution, 1989-12) Montgomery, Ellyn T. ; Dunn, Christopher V. R. ; Williams, Albert J.

Data on the effects of winter conditions on the transport of sediment on the continental shelf off Northern California were collected during the flrst year of the Sediment TRansport Events on Shelf and Slope (STRESS) Experiment. This experiment was done in conjunction with (Shelf Mixed Layer Experiment) SMILE and (Biological Effects on Coastal Ocean Sediment Transport) BECOST to provide a complete suite of measurements of nearshore dynamics, sediment transport, and biological interactions. This report includes a general description of the work accomplished during the frrst STRESS fleld season, carried out in the winter of 1988-1989 off the Northern California coast Three cruises were completed during the STRESS experiment, one each for deployment, turnaround, and r~overy of the instruments. This created two back-to-back sections of data, one from December 4, 1988 to January 23, 1989, and the other from January 29 to March 17, 1989. This report also documents in detail the use of the Benthic Acoustic Stress Sensor (BASS), and the associated acoustic data telemetry link in STRESS. BASS has been used in different configurations previously, but the acoustic telemetry system is new.
Surface-wave data acquisition and dissemination by VHF packet radio and computer networking

(Woods Hole Oceanographic Institution, 1988-04) Briscoe, Melbourne G. ; Denton, Elsie ; Frye, Daniel E. ; Hunt, Mary M. ; Montgomery, Ellyn T. ; Payne, Richard E.

Waverider buoy data are normally transmitted on a 27 MHz analog radio link to a shore station a few miles away, where the buoy data are plotted on a paper strip-chart recorder or logged digitally for later computer processing. Instead, we have constructed a relay station on Martha's Vineyard island that retransmits the received Waverider data over a digital, 148 MHz packet-radio link to a personal computer in our laboratory on Cape Cod, where the data are edited, processed, spectrally analyzed, and then sent over an Ethernet line to our Institution mainframe computer for archiving. Telephone modem access of a special wave-data file on the mainframe permits unattended data dissemination to the public. The report describes the entire system, including Waverider buoy mooring hardware, computer programs, and equipment. The purpose of the project was to learn what difficulties are involved in the automated acquisition and dissemination of telemetered oceanographic data, and to gain experience with packet radio techniques. Although secondary to these purposes, the long-term surface-wave monitoring off the southwest shore of Martha's Vineyard has its own scientific, engineering, and environmental benefits.
HRP II—the development of a new vehicle for studying deep ocean mixing

(Woods Hole Oceanographic Institution, 2006-02) Montgomery, Ellyn T.

The High Resolution Profiler II (HRP-II), a unique, autonomous untethered, deep-ocean capable, profiling vehicle was designed and developed at WHOI during 2002-2003. During a vertical profile, it measures and records temperature, conductivity, pressure, horizontal and vertical components of velocity and turbulent-scale temperature and velocity gradient data. Great care was taken to minimize vibrations that would contaminate data from the microstructure sensors; the vehicle's movement is driven by graity, the body materials and shape were optimized for stiffness and no computer disk activity is allowed while profiling. All sensors are positioned to measure the same volume of water, and allow undisturbed flow to reach each one. The HRP-II was tested over the continental slope in January 2004. All aspects of vehicle function were successfully tested during seven profiles, the deepest of which was to 1583m. On one dive to 835m, termination was achieved at 17m above the bottom, close to the design specification. Several sensor and controller issues were identified that need to be resolved, but overall the vehicle performance on the test cruise was exceptional. The vehicle design specification, mechanical and electrical systems, sensors, controller, communications protocols, and testing of the HRP-II are documented in this report.
Cruise report : Oceanus 250 Leg 4 High Resolution Profiler survey for the North Atlantic Tracer Release Experiment: (NATRE), March 25-April 24, 1992

(Woods Hole Oceanographic Institution, 1993-08) Montgomery, Ellyn T. ; Schmitt, Raymond W.

This report describes fine- and microstructure profile data taken on R/V Oceanus cruise 250 leg 4, between March 25 and April 24, 1992. During this cruise, an area of the Canary Basin near the Subduction Experiment's central mooring was surveyed with the High Resolution Profiler (HRP). The goals of the survey were to describe the hydrographic properties of the water adequately to recommend a location for the North Atlantic Tracer Release Experiment (NATRE) tracer injection, and to characterize the microstructure for comparison with the NATRE results. The work performed at sea, instrumentation, data return and processing procedures will be summarized in this report.
Turbulence and waves over irregularly sloping topography : cruise report - Oceanus 324

(Woods Hole Oceanographic Institution, 1999-12) Montgomery, Ellyn T. ; Polzin, Kurt L.

This report documents the work of R/V Oceanus cruise 324, which occurred during May of 1998. This cruise was the field component of the Turbulence and Waves in Irregularly Sloping Topography (TWIST) program. TWIST was part of the Littoral Internal Wave Initiative (LIW) supported by the Office of Naval Research. The objective of TWIST was to sample the background, internal wave and turbulence properties on the Continental Slope in the Mid-Atlantic Bight. Previous investigations have revealed strongly enhanced finescale internal wavefields and much more energetic turbulence due to internal wave breaking above topographic roughness associated with the Mid-Atlantic Ridge. So, an area of steeply sloping ridges and troughs running perpendicular to the continental slope near 36˚34'N, 74˚39'W was chosen as the site of the observational program due to its topographic similarity to the Mid-Atlantic Ridge. Fíve instrument systems were employed to make observations during this cruise: the High Resolution Profier (HRP), three Moored Profiler (MP) moorings, a Lowered Acoustic Doppler Current Profiler/Conductivity, Temperature, Depth (LADCP/CTD) rosette, eXpendable Current Profilers/eXpendable CTD (XCP/XCTD), and finally, the shipboard ADCP. The data from these instruments (more than 1100 full depth profiles) provide adequate spatial and temporal resolution to describe the finescale and turbulent processes observed.
Use of the High Resolution Profiler (HRP) in the Brazil Basin Tracer Release Experiment

(Woods Hole Oceanographic Institution, 1998-03) Montgomery, Ellyn T.

On two recent cruises January 1996 and February 1997) aboard the R/V Seward Johnson, scientists from the Woods Hole Oceanographic Institution studied the deep mixing processes in the Brazil Basin. Two instrument systems were used in this experiment: the tracer injection and sampling system, and the High Resolution Profiler (HRP). The HRP measurements complement those obtained by the tracer sampling system, providing independent estimates of the turbulent and diffusive mixing occurrng in the study area. During the cruises, the HRP was used to make two zonal sections across the basin, provide data used to select the tracer injection site, and explore the jagged terrain near the Mid-Atlantic Ridge. The HRP component of the work at sea, an instrument description, data return and some preliminary results are presented in this report.
Cruise report-Oceanus 218, March 20-April 9, 1990 : warm ring inertial critical layer experiment (WRINCLE)

(Woods Hole Oceanographic Institution, 1991-11) Schmitt, Raymond W. ; Montgomery, Ellyn T.

R/V Oceanus Cruise 218 (OC218) departed Woods Hole March 20,1990 for 20 days of work in a Gulf Stream Warm Core Ring. The scientific objective of the Warm Ring Inertial Critical Layer Experiment (WRINCLE) was to study the phenomenon of inertial-internal wave trapping in anticyclonic rings and the associate mixing. High Resolution Profiler (HRP) casts provided fine- and microstructure data and the Richardson Number float and eXpendable Current Profiler (XCP) surveys provided velocity and density finestructure measurements. During the time R/V Oceanus was in and around the ring, 78 HRP drops to 1000 m were completed, and data from 55 XCPs, 26 Conductivity Temperature and Depth Profiler (CTD) casts, and 59 eXpendable BathyThermograph (XBTs) were logged. The free-drifting Richardson Number float (RiNo) acquired data for eleven days in ring center. This report documents the work performed at sea, and summarizes some of the data collected.
A compilation of moored current meter and wind recorder data: volume XXXVIII, Long-Term Upper Ocean Study (LOTUS): (Moorings 787, 788, 789, 790, 792)

(Woods Hole Oceanographic Institution, 1985-12) Tarbell, Susan A. ; Montgomery, Ellyn T. ; Briscoe, Melbourne G.

The Long-Term Upper Ocean Study (LOTUS) was a two-year field experiment near 34°N, 70°W, designed to acquire a continuous set of measurements of currents and temperatures in the upper, open ocean together with local hydrography, meteorology, and mesoscale oceanographic features. The first scientific moorings were deployed in May 1982. The first year of mooring data, from May 1982-April 1983, is presented by Tarbell, Pennington and Briscoe (1984, W.H.O.I. Tech. Rept. 84-36). The second year of mooring data, from April 1983-May 1984, when the final mooring recovery occurred, is presented here.
The High Resolution Profiler (HRP) : user’s guide and software modifications documentation

(Woods Hole Oceanographic Institution, 1991-01) Montgomery, Ellyn T.

This report provides a User's Guide for operation of the High Resolution ProfIer (HRP) and documentation of the software structure and recent modifications. The HRP is an instrument that acquires and stores up to 16 types of physical oceanographic data. A profile is logged as the HRP falls through the water column during each deployment. It controls its dives based on user-specified trigger levels input during a pre-cast setup. Communications, the setup process, and how to check out and run the profiler are described fully. Also included are the current sensor configuration and summaries of assembly, mechanical preparation, tracking, data transfer and processing. During 1990, the software controlling the HRP was almost completely reworked in order to port VRTX (Versatile Real Time eXecutive) to the HRP. This was accomplished to facilitate use of a fast data link that was being developed. Other modifications were made to the software to improve the user interface, to alow use of up to 16Mbytes of Random Access Memory, to speed up the serial interface, and to fix previously undetected problems. In addition, the use of an altimeter to determine height above bottom was added to the dive control logic of the profiler.
The Long Term Upper Ocean Study (LOTUS) : cruise summary and hydrographic data report : Oceanus 154, May 1984

(Woods Hole Oceanographic Institution, 1984-10) Montgomery, Ellyn T. ; Pennington, Nancy J. ; Briscoe, Melbourne G.

OCEANUS cruise 154 (16-23 May 1984) was the final cruise in the two year field program of the Long Term Upper Ocean Study (LOTUS). The work occurred primarily in the LOTUS area (34°N, 70°W), where the entire moored array was recovered. The moorings were the following: the LOTUS-6 surface mooring (No. 792), a subsurface mooring (No. 788), two intermediate moorings (Nos. 789, 790), and a C. S. Draper Labs profiling current meter (PCMlH) mooring. Also on OCEANUS 154, a mooring was deployed for the U. S. Geological Survey at approximately 40°10'N, 69°58'W. On the return trip, an engineering test mooring was recovered at approximately 39°11'N, 70°01'W, some elements removed for testing, and then redeployed in the same location. This report presents the hydrographic data collected on OCEANUS 154, as well as providing details of the work that was accomplished.

Montgomery Ellyn T.

Last Name

First Name

ORCID

Filters

Author

Subject

Date

Type

Has files

Settings

Sort By

Results per page

Search Results