1 / 25

Observations of Lake Superior Physical Processes

Observations of Lake Superior Physical Processes. Jay Austin Large Lakes Observatory, UM-Duluth CSMI meeting 24 September 2013. Outline. Mooring array, 2005-Present Meteorological buoys Glider operations Profiler operations. NSF mooring array.

megan
Download Presentation

Observations of Lake Superior Physical Processes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Observations of Lake Superior Physical Processes Jay Austin Large Lakes Observatory, UM-Duluth CSMI meeting 24 September 2013

  2. Outline • Mooring array, 2005-Present • Meteorological buoys • Glider operations • Profiler operations

  3. NSF mooring array • 2005-present, up to seven locations in Lake Superior • 10-15 thermistors/mooring, ADCPs, DO, sed traps, ice profiler • Visited each 1-2/year • core moorings currently deployed • Recent results • Austin 2013, L&O, “Near Inertial oscillations in Lake Superior” • Titze and Austin, sub. To L&O, “Winter Thermal structure in Lake Superior” • Brethauer and Austin, in prep., “Observations of radiatively driven convection in Lake Superior” • Gloege and Austin, in prep., “Distribution of near-inertial energy in Lake Superior”

  4. Lake Superior Mooring Array Core Moorings: Western, Central, and Eastern Outer Moorings: Far Western, Northern, Southern, Far Eastern

  5. Lake Superior Mooring Array • Year-round deployment • Thermistors span the water column at each location • Temperatures recorded at 1- to 10- minute intervals • Surface temperature near core moorings available from NDBC

  6. Thermistor Data • General dimictic pattern • Strong summer stratification • Weaker negative stratification in the winter

  7. Interannual and Spatial Variations • Significant interannual and spatial variation in the data • 2009 – Cold winter with high ice cover • 2012 – Warm winter with very little ice cover

  8. Raw velocities, WM (E-W and N-S) East-West North-South

  9. Meteorology buoys • Two buoys in western arm- near McQuade, offshore (NDBC 45027, 45028) • 2010-present, Apr-Nov • WS/WD, AT, WT x10, RH, PAR, SW, BP • Used by NWS Duluth for near-shore forecasts

  10. Glider program • Active field activities in 2011 (~50 days) , 2012 (~35 days), and 2013 (~18 days, +12 Tahoe) • Repeats of line in Western arm in 2011-12 • Keweenaw  IR in 2013 (3x so far) • T, C, P, DO, Tr, Chl-A, CDOM • Very high horiz. Resolution • High endurance • No weather bias (but ice bias) • Austin, JGLR 2013, “Potential for Autonomous Gliders in large lake research”

  11. Temperature, conductivity, depth • Chl-a and CDOM fluoresence • Backscatter @700nm • Dissolved oxygen • (position- lat/lon)

  12. Glider transect

  13. Too close to shore Just right Too deep- bottom currents weak

  14. Temperature/Conductivity/Depth • Currents (ADCP) • Chl-a, CDOM, PC, and PE fluoresence • Backscatter @ 700nm • Dissolved Oxygen • Nitrate • PAR

  15. Acknowledgements

  16. Mean Summer (July-September) SFC water temp

More Related