Monthly Archives: June 2017

Ship ops teleconference notes – June/20/2017

Call minutes – Inner Shelf DRI ship ops (June/20/2017)

Attendees: Amy Waterhouse, Jen MacKinnon, André Palóczy, Ata Suanda, John Colosi.

SIO aircraft group (Luc and Ken):

  • Make sure some of the flights overlap with ship tracks. Want to look for surface signature of IWs and track them. Also interested in fronts and flow separation at Pt. Sal.

  • Will arrive at Pt. Sal on Sep/10 to set up. Can start flying on the 11th, but very flexible.

  • Observations/instrumentation: Directional surface wave spectrum (SSH from the LIDAR at ~30 cm horizontal resolution), surface temperature and surface velocity from feature tracking (from IR cam). Also surface wave breaking (from the visible-band cam).

  • Swath: For surface velocity ~2 km, for waves and fronts ~1 km – 200 m.

  • Flight speed: 50 m/s.

  • Flight times are weather dependent. If foggy, no flight.

  • Can send phone pictures to people in the ships.

General remarks:

  • Luc/John: During the pilot, saw more IW beams reaching Pt. Sal propagating from W to E or from SW to NE.

  • Luc/John: IWs were more energetic South of Pt. Sal (Between Pt. Arguelo and Pt. Conception).

  • Ata: A crude way of removing the barotropic tide from the ship data is to subtract the vertically-averaged velocity averaged over the ship track.

  • Jen: For the headland eddies module: How much vorticity is inshore/offshore of the 20 m isobath around Pt. Sal?

Ship ops teleconference notes – June/05/2017

Call minutes – Inner Shelf DRI ship ops (June/05/2017)

Attendees: Amy Waterhouse, Jen MacKinnon, Jack Barth, André Palóczy, Chris Chickadel, Melissa Moulton.

Info from UW aircraft group (Chris and Melissa):

  • Interested in surfzone-inner shelf exchange, fronts and surface signature of IWs and bores.

  • Can fly up to 8 h/day, refuel after 4 h and return to survey. ~1 h of transit.

  • Will be flying during 11-19/Sep and 5-14/Oct.

  • Instruments: IR and visible cameras, also surface currents. Resolution of ~6 m after processed.

  • The only real-time data available is from the visible-band camera.

  • Along-shore surveys up to 20 km, about ¼ South of Pt. Sal and ¾ North of it, up to SL Obispo.

  • Cross-shore surveys. Can cover the nearshore while Ken and Luc cover the offshore.

  • Melissa: Could do short ~45 min flights, or longer ones. Synopticity/coverage trade-off.

  • Interested in combining the subsurface ship data with the synoptic aircraft data. Will be able to 1) Sample interesting features found by the ship group and 2) Inform the ship group of interesting features.

Discussion on model sampling analyses:

  • Jen: Add white noise to simulate instrumental error.

  • Jen: Look how sampled model output changes as f(noise level, # of ships, sampling pattern).

  • Jack: Look at how aliasing changes with different sampling patterns with 2+ ships. Examples:

    • 2 ships sampling parallel lines (along- or cross-shelf) in opposite directions?

    • 2 ships sampling a bow tie pattern in between two isobaths.

    • 2 ships sampling parallel lines (along- or cross-shelf) in the same direction?

    • 3 ships sampling parallel isobaths in the same direction (e.g., Oceanus at ~100 m, Sproul at ~30 m and Kalipi at ~10 m)?

  • Jack: Calculate eddy cross-track transports (e.g., u’T’). Use as a metric.

General remarks:

  • Chris: Live radio communication: APL has one radio, Ken and Luc might have another one.

  • Chris: May be able to have live position information from an online product by NASA.

  • Jack: Daily evening meetings during experiment.

  • Jen: Headland eddies module will benefit greatly from aircrafts + ships + drifters synergies.

TODO:

  • André:

    • Sample the 3 test boxes (North/South of Pt. Sal and off Pt. Sal) and write meso-/submesoscale module summary.

    • Ask Manu about hi-freq (5-15 min) model output. Also discuss with Ata.

scripps oceanography uc san diego