BEGIN:VCALENDAR VERSION:2.0 PRODID:-//18.83.4.138//NONSGML kigkonsult.se iCalcreator 2.20// CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Oceans at MIT X-WR-CALDESC:Striving to understand\, harness and sustain Earth'\;s def ining frontier. X-FROM-URL:http://oceans.mit.edu X-WR-TIMEZONE:America/New_York BEGIN:VTIMEZONE TZID:America/New_York X-LIC-LOCATION:America/New_York BEGIN:STANDARD DTSTART:20171105T020000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RDATE:20181104T020000 TZNAME:EST END:STANDARD BEGIN:DAYLIGHT DTSTART:20180311T020000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT UID:u24hh7d4d0vvru16l1rum83b1k@google.com DTSTAMP:20180503T091841Z CATEGORIES;LANGUAGE=en-US:MIT Seminar | PAOC Oceanography and Climate Sack Lunch CONTACT: DESCRIPTION:We describe and interpret in situ observations of tidally drive n turbulence that were obtained in the vicinity of a small channel that tr ansects the crest of the Mendocino Ridge in the north-eastern Pacific. Flo ws are funneled through the channel and have tidal excursion lengths compa rable to the width of the ridge crest. Once per day\, energetic turbulence is observed in the channel\, with overturns spanning almost half of the f ull water depth. A high resolution\, nonhydrostatic\, 2.5-dimensional simu lation is used to interpret the observations in terms of the advection of a breaking tidal lee wave past the site location\, and subsequent developm ent of a hydraulic jump. During this phase of the tide the strong transpor ts were associated with full depth flows\, however\, during the weaker bea t of the tide transports were shallow and surface-confined\, generating ne gligible turbulence. A regional numerical model of the area finds that the subinertial K1 (diurnal) tidal constituent generates topographically trap ped waves which propagate anticyclonically around the ridge\, and are asso ciated with enhanced near-topographic K1 transports. The interaction of th e trapped waves with the M2 (semidiurnal) surface tide produces a baroclin ic tidal flow that is alternately surface confined and full depth. Consist ent with observations\, full depth flows are associated with the generatio n of a large amplitude tidal lee wave on the northward face of the ridge\, while surface confined flows are largely nonturbulent. The regional model demonstrates that nearfield dissipation over the entire ridge is diurnall y modulated\, despite the larger amplitude of the M2 tidal constituent\, i ndicating that the trapped wave modulates near-field dissipation and mixin g at this location. DTSTART;TZID=America/New_York:20160309T120000 DTEND;TZID=America/New_York:20160309T130000 LOCATION:54-915 SEQUENCE:0 SUMMARY:SLS- Ruth Musgrave (MIT-MechE) – Tidally driven mixing: breaking le e waves\, hydraulic jumps and the influence of subinertial trapped interna l tides URL:http://oceans.mit.edu/event/sls-ruth-musgrave-mit-meche-tidally-driven- mixing-breaking-lee-waves-hydraulic-jumps-and-the-influence-of-subinertial -trapped-internal-tides X-ALT-DESC;FMTTYPE=text/html:\\n\\n\\n\\n\\nWe describe and interpret in situ observations of tidally driven turbulence that were obta ined in the vicinity of a small channel that transects the crest of the Me ndocino Ridge in the north-eastern Pacific. Flows are funneled through the channel and have tidal excursion lengths comparable to the width of the r idge crest. Once per day\, energetic turbulence is observed in the channel \, with overturns spanning almost half of the full water depth. A high res olution\, nonhydrostatic\, 2.5-dimensional simulation is used to interpret the observations in terms of the advection of a breaking tidal lee wave p ast the site location\, and subsequent development of a hydraulic jump. Du ring this phase of the tide the strong transports were associated with ful l depth flows\, however\, during the weaker beat of the tide transports we re shallow and surface-confined\, generating negligible turbulence. A regi onal numerical model of the area finds that the subinertial K1 (diurnal) t idal constituent generates topographically trapped waves which propagate a nticyclonically around the ridge\, and are associated with enhanced near-t opographic K1 transports. The interaction of the trapped waves with the M2 (semidiurnal) surface tide produces a baroclinic tidal flow that is alter nately surface confined and full depth. Consistent with observations\, ful l depth flows are associated with the generation of a large amplitude tida l lee wave on the northward face of the ridge\, while surface confined flo ws are largely nonturbulent. The regional model demonstrates that nearfiel d dissipation over the entire ridge is diurnally modulated\, despite the l arger amplitude of the M2 tidal constituent\, indicating that the trapped wave modulates near-field dissipation and mixing at this location. \n END:VEVENT END:VCALENDAR