Co corahs albedoinstr_14may2012

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Co corahs albedoinstr_14may2012

  1. 1. Measuring Snow Properties: Albedo, Depth & Density Elizabeth Burakowski, UNH elizabeth.burakowski@gmail.com 14-May-2012
  2. 2. EquipmentScraper  or  Spatula   Digital  Hanging     Scale   Field  Notebook   2-­‐?  and  4-­‐?  snow   tubes  with  caps   Pyranometer  on   leveling  boom   Yards:ck  
  3. 3. Where to Measure•  In an level open area, with no shading from trees, houses, fences, etc.•  Undisturbed snow pack (no trampling by boots, pet waste, etc)•  Point leveling boom at sun (south) to reduce shadowing•  If snowpack is thin or patchy, pick an area that is most representative of overall snow conditions.•  Measurement area should be about 1 m2
  4. 4. When to Measure•  Collect daily snow-covered and snow-free measurements from first snowfall until end of snow season.•  Take measurements under clear sky and overcast conditions. Partly cloudy days passing clouds affect measurements.•  Begin daily data collection ±30 min of Local Solar Noon:•  http://www.esrl.noaa.gov/gmd/grad/ solcalc/.
  5. 5. How To Measure1.  Identify area to measure and approach from north (do not trample your sampling area).2.  Point leveling boom south with pyranometer facing upward, use bubble at hip to level. Record UP1.3.  Flip boom and level at hip with MP-200 facing downward. Record DOWN1.4.  Repeat steps 3 & 4 two more times, for total of three up & down paired measurements.5.  Turn off pyranometer and replace green cap. Record other values (e.g., cloud and snow conditions)6.  Enter recorded values at www.albedo.csrc.dev
  6. 6. How To MeasurePlease also remember to record the followingat the time of albedo measurement:Start Time (HHMM) and End Time (HHMM)Cloud Cover: OVC- overcast PCL – partly cloudy CLR – clear ACLR – all clear or blue bird. 0% cloud cover.Snowmelt: Yes or no.Snowing: Yes or no.Comments: passing clouds, grass or vegetation showing, debris on snow, etc.
  7. 7. How To Measure1.  Power button 2  2.  Meter read-out (in Watts/m23.  No need to use 3   these buttons. Sensor will display values instantly!8
  8. 8. BatteriesThe Apogee MP-200 takes one RenataLithium CR2320 battery. One batteryshould last you the whole winter.If necessary, we will send you areplacement battery.
  9. 9. Snow Depth1.  After you’ve measured albedo, take a snow depth measurement from an area representative of your albedo measurement area.2.  Place tube (2-ft or 4-ft) vertically into the snow pack.3.  Scrape snow off the side of the tube and measure snow depth to ground, rounding to nearest 0.5”. If you are unable to reach the ground surface (i.e., ice layer at bottom of tube), record the snow depth collected in the tube and note approximate thickness of ice not collected in tube.
  10. 10. Snow Density1.  Place spatula under bottom of tube, lift way from the snowpack and carefully secure cap on bottom of tube. Bring the tube indoors to weigh (scale does not work well in cold weather).2.  Hang the scale from a sturdy hook. Turn on the scale and watch for 0.000 lb to appear. (Hit mode button if in kg to switch).3.  Hang tube on metal scale hook, using hole at the top of the tube. Measure to nearest hundreth (0.00). Record the total weight (tube, caps and snow!) in lab notebook.
  11. 11. Data Entry h"p://www.albedo.csrcdev.com/  
  12. 12. Data Entry1.  Select  your  CoCoRAHS  sta:on  number   from  the  drop-­‐down  list.  2.  Start  and  end  observa:on  :me  apply   specifically  to  albedo  measurements.  3.  Cloud  cover  at  :me  of  albedo  observa:on  4.  An  error  will  occur  if  your  outgoing   (reflected)  value  is  greater  than  incoming.      5.  Snow  depth  is  depth  of  snow  collected  in   the  tube.    Note  depth  of  any  snow/ice   unable  to  be  collected  in  tube  in  the   observa:on  notes  sec:on.      6.  Snow  tube  tare  weight  is  the  weight  of  the   empty,  dry  tube  with  caps  (to  be  made   daily).  7.  Snowmelt  since  last  observa:on  (yes/no)  8.  Include  comments  on  grain  size,   patchiness,  leaf  liVer  and  debris  in   observa:on  notes.        
  13. 13. How To Measure1.  Identify area to measure and approach from north. Questions?2.  Point leveling boom south with MP-200 facing upward, use bubble at hip to level. Record UP1.3.  Flip boom and level at hip with MP-200 facing downward. Record DOWN1. Contact: Liz Burakowski4.  Repeat steps 3 & 4 two more times, for total of ean2@unh.edu three up & down paired measurements.5.  Turn off MP-200 and replace cap. Record other comments (e.g., cloud and snow conditions)6.  Enter recorded values on CoCoRaHS.org

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