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IFYLE Participants
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Cruise Types
Buoy
- Coverage: Cruises serviced 5 stations, lined along the central "axis" of the lake (from the islands to the deep hole in the east basin)
- Deployment, servicing, and retrieval of moorings (buoys, sediment traps, thermistors, transmissometers, current meters, acoustic doppler current profilers)
- Type of sampling: service sediment traps, box cores, ponar grabs for macrobenthos; CTD and water sampling
- Time on station: 2-12 hours
- Vessel: RV Laurentian (one exception: the RV Lake Guardian was used in late August)
- Frequency: Monthly, 3-5 days in duration, May through October
Transect
- Coverage: Central basin only; 4 north-south transects and 3 west-east transects were sampled continuously during both day and night
- Type of sampling: Underway towing of fish acoustics and plankton survey system (undulation fish with CTD, Par sensor, oxygen sensor, transmissometer and OPC); CTD casts and vertical zooplankton tows were made at 3-4 stations along each transect (both day and night); 1-2 mid-water and bottom trawls were made per transect (both day and night)
- Time on station: less than 60 minutes
- Vessel: RV Laurentian (one exception: the RV Lake Guardian was used in early August);
- Frequency: Monthly, 5-7 days in duration during May through October
Fixed-Station
- Coverage: All basins
- Type of sampling: on-station sampling, with continuous collections of primary productivity (using Ferry-box sampling) and microbial communities (using flow cytometry); 48 stations were sampled, with 30 core stations sampled at a minimum (including the EPA dissolved oxygen stations); CTD casts made at each station; nutrient profiling done microbial communities sampled; toxins measured; occasional box coring, optical measurements
- Time on station: ~2 hours per station
- Vessel: RV Lake Guardian
- Frequency: Monthly, 5-7 days in duration, May through September
Diel
- Coverage: Central basin only (2-5 sites per cruise)
- Type of sampling: Short (5 km) transect sampled every 4 hours for a 24 hour period; repeated at 1-3 sites in an area likely to become hypoxic (less than 4 mg/l) during summer and 1-2 sites in an area likely to remain well-oxygenated (more than 4 mg/l) during summer; underway sampling with fish acoustics and an undulating fish with CTD, OPC and Par sensor, oxygen sensor, transmissometer; mid-water and bottom trawling were conducted simultaneously with underway sampling; on-station vertical profiles of temperature, oxygen, chlorophyll, Par, zooplankton; macrobenthos also sampled
- Time on station: 24 hours per station
- Vessel: RV Lake Guardian (underway sampling) and RV Laurentian (trawling)
- Frequency: Monthly, 4-8 days in duration during May through September
Harmful Algal Bloom (HABs)
- Coverage: West basin only
- Type of sampling: A variety of field sampling and experiments conducted; collections of water needed inside and outside of blooms
- Time on station: Undecided
- Vessel: RV Lake Guardian
- Frequency: Single cruise August 27-31
Harmful Algal Blooms Tracking Cruise Leg (HABs Tracking)
- Coverage: West basin only
- Type of sampling: A variety of field sampling and experiments conducted; cruises will target large HABs; also will service buoys during non-outbreak times
- Time on station: Undecided
- Vessel: RV Laurentian
- Frequency: Single cruise August 21-31
Dye-Tracking
- Coverage: Central basin only
- Type of sampling: Following distribution of SF6 released into central basin
- Time on station: Constantly moving
- Vessel: RV Laurentian
- Frequency: Single cruise July 18-August 6
| Contact Information | |
| Anne H. Clites (Data Support) NOAA-GLERL, 2205 Commonwealth Blvd. Ann Arbor, MI 48105-2945 (734)741-2282 |
Giselle Maira (Technical Issues) NOAA-GLERL, 2205 Commonwealth Blvd. Ann Arbor, MI 48105-2945 (734)741-2242 |