Concept Tests for a New Wire Flying Vehicle Designed to Achieve High Horizontal Resolution Profiling in Deep Water

Efficiently profiling the water column to achieve both high vertical and horizontal resolution from a moving vessel in deep water is difficult. Current solutions, such as CTD tow-yos, moving vessel profilers, and undulating tow bodies, are limited by ship speed or water depth. As a consequence, it is difficult to obtain oceanographic sections with sufficient resolution to identify many relevant scales over the deeper sections of the water column. This paper presents a new concept for a profiling vehicle that slides up and down a towed wire in a controlled manner using the lift created by wing foils. The wings provide a novel low-power method of propulsion along the cable by using the free stream velocity of the wire moving through the water in similar fashion to a sailboat sailing up wind. Scale model tests show a wide range of achievable profiling glide slopes for tow cable angles between vertical and 45°, and effective isolation of cable strum vibration from the towed vehicle body. The concept is not depth limited and will offer two-dimensional resolution that meets or exceeds current undulating tow bodies over the full water column. Additionally, this system could be used simultaneously with many other deep towed instrument packages to produce complementary datasets

Measuring lateral heat flux across a thermohaline front: A model and observational test

We develop and test a method to observationally estimate lateral intrusive heat flux across a front. The model combines that of Joyce (1977), in which lateral cross-frontal advection by intrusions creates vertical temperature gradients, and Osborn and Cox (1972) in which vertical mixing of those gradients creates thermal microstructure that is dissipated by molecular conduction of heat. Observations of thermal microstructure dissipation χT are then used to estimate the production by intrusions, and hence the lateral heat flux and diffusivity. This method does not depend on the precise mechanism(s) of mixing, or on the dynamical mechanisms driving the frontal intrusions. It relies on several assumptions: (1) lateral cross-frontal advection produces diapycnal temperature gradients that are mixed locally, (2) thermal variance is dissipated locally and not exported, (3) intrusion scales are larger than turbulence scales, and (4) isotropy of temperature microstructure is assumed in order to estimate χT.The method is tested using microstructure observations in Meddy Sharon, where the erosion rate and associated lateral heat flux are known from successive mesoscale hydrographic observations (Hebert et al., 1990). An expression is developed for the production (lateral heat flux times lateral temperature gradient, expected to equal χT) in a front of steady shape that is eroding (detraining) at a steady rate; the production is proportional to the erosion speed and the square of the cross-frontal temperature contrast, both of which are well-known from observations. The qualitative structure and integrated value of the dissipation agree well with model assumptions and predictions: thermal variance produced by lateral intrusive heat flux is dissipated locally, dissipation in intrusive regions dominates total dissipation, and the total dissipation agrees with the observed erosion rate, all of which suggests that microstructure observations can be used to estimate intrusive heat flux. A direct comparison was made between lateral heat flux estimated from mesoscale Meddy structure plus the known rate of erosion, and lateral flux based on microscale temperature dissipation, with excellent agreement in the frontal zone and poorer agreement where lateral temperature gradient is too small to accurately measure

Prospectus, March 23, 1983

ADMISSION POLICIES CHIEF CAUSE OF RESIGNATION: PARKLAND WOMEN\u27S BASKETBALL COACH RESIGNS; News Digest; Monticello wins overall; Time out; C-U Happenings; MDA needs volunteer attendants; Lobby display appreciated; Club Notes; NJCAA coverage considered \u27poor\u27; Profile: DAP instructor Lake; Finances influence spring break decisions: Question: What are you going to be doing over spring break?; Failure to register for draft: Tangle of red tape threatens financial aid process; PC financial aid is business as usual; Urban League priority: find jobs; We Saw You On Campus; Central Illinois part of Tornado Alley; Believe it or not..; Eight-state area is the tornado capital of the world; Classified; Skylines; Trivia quiz; The Ramones are true \u27rock and roll\u27; Enter Oscars contest today; Trivia quiz dies; Sport shorts; Parkland College Softball Schedule; Parkland College Baseball Schedule; Parkland College Outdoor Track Schedule; 1983 Parkland College Indoor Track All-Americanshttps://spark.parkland.edu/prospectus_1983/1021/thumbnail.jp

Prospectus, April 9, 1983

WELCOME SPRING!; News Digest; Job fair figures show rosy future for some; PC donors can aid Miller; Editor accused of bias; PC jazz groups perform at UI; GM seminar offers new regional training; Animals suffer for science; Judges deliberating; Readers look to the stars for favorite feature: Question: What is your favorite Prospectus feature?; Instructor prefers teaching to testing; Club Notes; C-U happenings; Signs of Spring...; Classified; Skylines; Trivia quiz; Selleck adventure surprisingly good; Sport shortshttps://spark.parkland.edu/prospectus_1983/1020/thumbnail.jp

Prospectus, February 16, 1983

PARKING PROBLEMS CONTINUE; News Digest; Opinions; C-U happenings; Many complain, few vote; Photo deadline is April 8; East hard hit by snows; Dental care routine for most at PC; Dental clinic serves all district residents; Benefits offered students; CTEP cover risk areas; Club News; Scholarships depend on SSS registration; Skylines; Easy does it!; Student gift helps program; Illinois economy due to see recovery soon; Tourney open to public; Ice Capades return to Champaign-Urbana: Medal winners combine talents to entertain; Classified; Prices under $1 now seen; Roddenberry explores creative new worlds; Trivia quiz!; Whoopsie!; Are pros too highly paid?; Intramural Results; Boardbusters earn win; Early trail leads to win; Cobras now 22-1https://spark.parkland.edu/prospectus_1983/1025/thumbnail.jp

Prospectus, November 17, 1982

REVIEW BOARD VOTES TO DISMISS STUGO SENATOR; News Digest; We focus on Gibson City; Education necessary to prevent devastation; Election will not solve problems; Student concerned about car parking; \u27Humorist\u27 saga may end; Smokers face higher prices, risk; Parkland club notes: German Club, PMA, BSA; Day set aside to kick habit; Parkland students honored; Urbana High plans dinner; C-U Happenings; Mr. Roberts to speak at P.C.; Little snow seen for November; \u27Valspeak\u27 thought to be less than awesome; You too, can be like, incoherent; Gallery has photo exhibit; Ideas needed; Places and faces in Gibson City; The voodoo chile lives; Petty talent on upswing; Palin provides irreverent relevance; B movies receive star treatment; Abba member goes solo; Second City first rate; Tour the galaxy without panic; Classified; Skylines; Family weekend set for sports; Sports Shorts; \u27Will the big men bring home the bacon\u27?; Slow Samhttps://spark.parkland.edu/prospectus_1982/1004/thumbnail.jp

Prospectus, January 26, 1983

SPRING RECORD BROKEN; News Digest; Computer will provide basic data storage; Tea ceremony backed by 450 years of tradition; Student papers taken; Comedy auditions set; PMA wants members; Reality, not drama, taught; Play detective!; Parkland Invitational Tournament Jan. 14-15 1983; Classified; Apathy is disappointing; Skylines; Weapons training part of CJC plans; Spring brings another chance; Trivia quiz returns; Rundgren goes it alone; Nonsense makes sense; Benatar album is anti-bootleg effort; Championship, MVP award go to Cobras; Third ski trip next monthhttps://spark.parkland.edu/prospectus_1983/1026/thumbnail.jp

Prospectus, March 2, 1983

PARKLAND AT NIGHT…; News Digest; Evening job is preference; Two from PC named to board; StuGo challenged; Nominate now; UI feature: Engineering; 32nd open house planned; Behind in payments? This may be helpful; People want more than transportation; Auto mechanics must change with the times; Yesteryear: new car less than $900; Women\u27s History Week; Attending evening classes requires dedication; Parts available; \u2783-\u2784 aid forms ready; Parkland P.M.; Pick a winner; Rolling Stones as vital as ever; Reputations are staked on Oscar predictions; Classified; C-U happenings; Skylines; \u27Roughing it\u27 isn\u27t what it used to be; \u27Worst thing that\u27s happened to college football...\u27: take the money and run; Track wins 15 of 17 in regional; Sport shorts; Globetrotters: comedy and skill; Record now 25-1 for PC womenhttps://spark.parkland.edu/prospectus_1983/1023/thumbnail.jp

The front on the Northern Flank of Georges Bank in spring : 2. Cross-frontal fluxes and mixing

Hydrographic observations made with an undulating vehicle carrying a CTD and concurrent shipboard ADCP velocity observations over a 12‐day period are combined to investigate vertical mixing and cross‐frontal fluxes on the Northern Flank of Georges Bank. The CTD density time series is analyzed to detect the presence of vertical overturns, the statistics of which are used to infer vertical mixing parameters. Vertical turbulent buoyancy fluxes are downward and most intense, reaching values of 5 × 10−7 W/kg, near the bottom at the edge of the bank and decrease both on‐ and off‐bank. Horizontal, cross‐bank buoyancy fluxes are partitioned into mean, tidal pumping, and nontidal eddy components and are computed as a function of cross‐isobath/vertical position by averaging in the along‐isobath direction. The tidal pumping component is dominant over most of the cross‐bank section with a peak value of ∼1 × 10−4 W/kg, directed off‐bank near the bank edge. A diagnosed tidal vertical velocity field is used with mean buoyancy gradients to compute the along‐isopycnal skew flux. The horizontal component of this skew flux has similar spatial structure and magnitude to that of the observed tidal pumping flux. The divergent component of the skew flux, at depths above the bottom boundary layer, appears to be convergent north of the bank edge and divergent at the bank edge, suggesting that tidally driven advective processes drive buoyant bank water downward and off‐bank at mid‐depth and force the upwelling of deep, dense water near the bottom at the bank edge

Prospectus, February 9, 1983

FOCUS ON ARCOLA…; News Digest; 292 vote in election; Pro-file: PS instructor Alan Hartter; More to PM job than fun, travel; New senators thank voters; Weapons are big business; Off-beat comedy set for PC drama team; Students offer suggestions on priorities; \u27Police must be flexible; C-U happenings; Club Notes; Works by Taft on display; Skylines; Plants may be blue; Roses are red; Amish have chosen Arcola area as home; Tourism and manufacturing vital to Arcola\u27s continued growth; Arcola sweeps broom market; NASA footage highlights evening; PBS celebrates Black History Month; Movie fans face heavy dose of déja vu; Guest artists gathered; False sincerity comes across; Future may see change in TV and radio ads; Classified; Holiday busy time for PO; Job seekers can learn; Cardinals proud to be champions; Athletic schedule; Sports junkies take delight in ESPN sports networkhttps://spark.parkland.edu/prospectus_1983/1027/thumbnail.jp