Sylvania / Helen Lake Flux Tower Field notes Location of eddy flux tower: 46, 14.521 N, 89, 20.859 W, Elevation 1770 ft at tower THIS IS NOT A COMPLETE RECORD OF ALL FIELD NOTES, BUT RATHER THE HIGHLIGHTS FROM THE NOTES OF ANKUR DESAI Gas tank changes can be found in the gasses spreadsheet Questions? Contact Ankur Desai 814-865-9617 2001 March 8 Initial site visit Location: 4mi W of Watersmeet 3-4 miles past Clark Lake campground, Snap Jack Lake sign Tower to left of electrical junction box Old met tower is 60 ft with temperature, PAR, wind sensors Also: soil temperature thermocouples Species: Hemlock, Birch, Maple Snow depth: 3-4 ft April ?? 5 soil samples taken for moisture sensor calibration soil samples were oven dried, approx 3 kg room temperature distilled water added 24-hr wait period before taking reading Vol LWC TDR (ms) Probe A B C D E air dry 2% .813 .819 .795 .828 .818 5% .824 .824 .797 .848 .829 10% .892 .908 .875 .911 .885 15% .964 .957 .961 .984 .990 20% 1.10 1.03 1.10 1.04 1.10 25% 1.27 1.24 1.14 1.30 1.19 May 23 Access road cleared All trees in 200x200ft area around tower tagged and DBH Removed equipment off old tower May 24 New tower arrived at USFS office Removed pit/mound thermocouples Met with electrician, Curtis May 25 Electrical trench dug Tower base concerete poured Soil anchors dug into ground at 40.3 degrees Guy wires cut May 29-30 120ft Tower installed with Art Johnston, Ron Teclaw, Jon Martin, Eileen Carey, Ankur Desai, Emily Desai, others assisting Shed foundation installed Shed installed June 4-6 Flag out grounding trenches Ditch-witch'ed trenches, accidentally cut through soil thermocouples (Ron fixed one week later) Laid down 24 grounding rods and wire along 6 radials 5 radials are 50', 1 is 145', 1 around shed July 3-5 Added 7 profile lines Installed profiler Added 5 thermocouple lines to tower Lay out power lines Setup power distribution system Bring power to sapflux sites Added storage cabinets July 9-13 Set up thermocouple mounts Setup computer and profiler wiring July 23-27 Set up litter baskets (20) Finish wiring sapflux system - fix backward wires on site 3 Power to tower top Communication to tower top Installed flux enclosure, sonic anemometer GPS coordinates taken: 46.242017 N, 89.347650 W Aug Started taking data - very little data in August Consistent computer outages Leaks in profiler lines fixed Installed cell phone modem system Sept More repairs to site - more computer outages Good data in late August and early Sept Oct 15 Art Johnston retightened and releved tower Oct 30 Snowfall adapter added to precip gauge Nov 18 Laptop replaced with desktop computer Frequenct outages and computer crashes through Dec. Automatic ring rebooter system added December Very little data from late Nov to mid Dec 2002 Jan 9 19 UTC Licor 6262 (flux) gain and offset turned down PAR and NetRad sensors appear to be unlevel April 7- Site cell phone doesn't answer time to time Problem with transceiver system Bruce visits site - dessicants replaced Filter and dessicant added to flux N2 line May Profiler pump regularly blowing out May 14-20 Site visit - No leaves out yet Licor 6262 replaced with loaner on May 15 Pump disphragm broken CR10X - SC32A broken - replaced with Bruce's Line conditioner added to system Clogged lines found in profiler exit - cleared Line reclogs - causing more total disphragm destruction (TDD) 1.67 scaffold towers erected Removed snowfall adapter from precip gauge on May 16 Releveled PAR and NetRad sensors Added grounding rods, redid grounding mounts Precip gauage moved to top of scaffold tower 1 *USE PRECIP DATA BEFORE MAY 20 WITH CAUTION - DATA IS AFFECTED BY TREE THROUGHFALL Recalibrated Licor 6262 on May 20 Sent cell phone for fixing to Campbell Sci. July 11-12 Licor 6262 loaner replaced with fixed IRGA Repaired cell phone put back in July 13-16 Faulty computer replaced More grounding tightening Capacitors installed on power line Sapflux wiring put on separate breaker and power supply Switched from using Zip disks to writing CDs New stronger KNF profiler pump installed on July 14 July 25 Licor 6262 fuse is regularly blowing out previous week CR23X also has high error rate on collection John Gerlach replaces fuses - it blows Jon Martin replaces fuses - it blows Ron Teclaw tightens wires, replaces RAD modem Bruce finally replaces fuses and finds the shorting power cable and fixes. Also tightens surge protector line for communication cable. Both Licor and 23X are happy again. Aug 1 Found bug in spectral correction Found bug in H flux, mom flux Redid all calibrations Recomputed 2001 and 2002 fluxes Aug 19-21 Late summer site visit coincident with ChEAS meeting Replaced filters Brought in all N2 (5) and CO2 (1) tanks for winter Retightened wiring connections Nov 15-18 Winterization visit Set zero and span on profiler (6252) with NOAA CMDL tanks (due for recal in 7/03) Recalibrated old CO2 tanks - Low: 339.7, High: 552.0, Ref: 446.8? Swapped in new CO2 ref tank - calibrated to 429.1 Swapped flux N2 Changed profiler pump diaphragms Changed flux pump diaphragms (electrical connections are M-F switched compared to profiler) Refilled nafion drierite column Refilled flux N2 drierite/soda lime column Refilled profiler (6252) reference and sample Mg-Perc columns Refilled profiler (6252) internal dessicant Refilled flux Licor (6262) external dessicant/soda lime (didn't do internal) Installed snowfall adapter to rain bucket at top of scaffold Changed all filters except reference N2 Duct taped flux licor (6262) inlet Almost mounted new antenna - needed a different TNC connector (next trip) Changed PC Anywhere settings to 4800 baud, 4 color Finished cleaning up mess around shed Didn't get shot by deer hunters (11/15 was opening day) Dec 6 Found a bug in the CO2 profiler concentration code Recomputed calibrations, storage, fluxes, NEE, all plots Created monthly respiration and PAR fits 2003 Jan 28-29 Computed final 2001, 2002 flux Feb 21-23 Pump at top of tower was off - broken switch - fixed Lowest level profiler stuck open - fixed Reset cell phone to operational status Added more duct tape to flux licor inlet to raise temp 2 degrees Added antifreeze to rain gauge Changed profiler filters Fixed temperature profile thermocouple problem (overcounted levels) 2" of ice in forest floor precip gauge Changed file format, redid filling methodology temp -15 C, wind 10-20 mph, around 20" of snow depth Apr 30 Newly calculated fluxes pushed to website Top level CO2 mixing ratio may be suspect since 4/15 due to low pressure readings at Licor May 22 Recalculated all fluxes for new u* screen and wind screen criteria June 2-5 Replaced stuck profiler valves (70 and 120 ft) Updated program to not blend 70 and 120 at 70 ft level Installed below canopy flux system - sonic is bad - will be replaced later in month Changed filters Calibrated profiler and new CO2 reference tank (340.7,449.7,552.6) Found hole in flux sample in line - not sure about fluxes in May :( Fixed cell phone power system Calibrated precip gauage (removed snowfall adapter) with 750 ml water bottle Changed chemicals (drierite, soda lime, Mg Perc, etc...) Changed internal filters on LI-6252 profiler Installed heavy-duty (250 pound) UPS power backup system Problem with profiler after chemical change - pressure is bad Left vent to air, nafion and back pressure reg removed June 26-July 3 Found hole in profiler line - fixed CO2 and storage data is bad from Day 156 to 177 Replaced twisted nafion tube (also new back pressure regulator) Changed CO2 ref gasses to PSU-calibrated high-precision gasses CO2 is "higher precision" from day 183 onward New standards: 336.51, 392.67, 428.18 ppm moved ground PAR sensors to 20ft and 40ft on tower on day 179 replaced sonic anemometer on below canopy flux system on day 177 shipped bad sonic to Campbell shipped NOAA primary standards to Boulder for recalibration installed Delta-T total/diffuse PAR sensor at 36m on day 178 field crew is characterizing coarse woody debris and exploring direction of anomalous respiration (sphagnum bogs, closed canopy, black spruce?) August 25-Sept 3 Hank Loescher / Ameriflux intercomparison visit Realigned sonic - found loose bolt 2 N2 tanks brought in Data are currently being processed November 7-10 Winterization visit Stopped in Minneapolis, checked on progress there Carbon/nitrogen analysis in progress Specific leaf area analysis in progress Litter analysis in progress Fine root analysis in progress Swapped reference CO2, recalibrated New set: 336.51 428.18 449.7 (first two are high-precision) Precip gauage snow adapter fitted and filled with environmentally sensitive antifreeze Diaphragms replaced on bottom and top pumps Licor duct taped All external chemicals replaced top and bottom Fiters changed Heater turned on and set to 50 Valves checked Below canopy flux shipped back to Penn State N2 tanks brought in, empties returned November 24 Automatic ring rebooter power strip dies apparently after ice storm / power outage Computer is off until December 1 Flux data lost 11/25-12/1 2004 February 22-24 Changed CO2 tanks - low and reference Changed NAfion, replaced chemicals Installed new ring rebooter Fixed stuck valve Changed tower filters, checked licor line for leaks KNF profiler pump died - replaced with Brailsford for now Something wrong with flux Licor - not sure Looks like data from 11/14 onward is not good Licor pressure and atm pressure are uncorrelated Bruce to examine on March 12 - replace pump June 15-20 Filters Gasses - swap Scott's tanks in unless already done so - if so then zero/span licor Bring in N2 (leave one for Bruce?) Chemicals - drierite, soda lime, Mg Perc Funnels - purchase equpment to restore filter funnels (coke bottles/cap/drill?) Diaphragms - replace Compass - check sonic alignment and tightness Flux - replace pressure baffle material and tubing and Swagelok fittings - use brass not plastic ferrules possibly replace Licor - yes Precip gauge - remove snow adapter Lake temperature - overnight runs - possible Backpack licor test - maybe use licor 6262 at Kemp - use Hobo datalogger GPS from Richardson Computer - test rebooter, get data Swapped licor, Bruce sent old for repair and reinstalled in late July Also pump swapped for Brailsford temporarily until late July Oct 16-20 Standard winter visit Replace hi-pres tanks with AGA tanks, hi pres shipped to PSU Chemicals, filters, diaphragm, precip all changed Winter N2 brought in Need to replace pressure sensor, fix diffuse PAR sensor Low on drierite 2005 winter visit skipped May 29-June 03 SUN Fixed stuck valves Install CO2 high precision replaced lower chemicals MON removed snow adapater on precip lower pump diaphragm replaced filters replaced upper chemicals replaced pressure sensor replaced Diffuse PAR sensor restarted, still looks weird at night upper pump diaphragm replaced started intercomparison setup TUE rechecked sonic alignment = 211 degrees magnetic replaced missing tower pump screw N2 swap - 5 in / 5 out CO2 swap - 1 more in / 4 out got intercomparison running - alignment 221 degrees THU take down intercomparison inventory: missing winter precip hose 30 filters low on drierite, molec. sieve 4 valves 2 pump diaphragms 5 N2, 1 CO2 full offline October 24-28 Standard fall visit Electrical system for sapflux taken down Precip gauge snowfall adapter broken - precip values for winter 05/06 bad Low std CO2 line replumbed - suspicion of leak Tower pump disphragm sheared, replaced with profiler pump and Brailsford pump for profiler Replaced high-precision CO2 with secondary stds 2006 winter visit - no need June 2-5 Standard Summer visit New AGA stds for CO2 - calibrated New filters, drierite, molecular sieve brought in Precip gauge - snowfall adapter off UN86 KNF pump put in for profiler since UN89 was unavailable (in by end of month) Diffuse PAR sensor still goofy, no fix ` PSU CO2 (2) shipped to Scott-Marin, AGA to pick up 7 empties N2 switched to lease on new tanks Flux notes: diffuse/direct PAR processing code bug, need to rerun bfiles from 2004 and 2005 nighttime values are still spurious though, don't trust