Data set creator(s): Mark Losleben
For data content questions, contact Niwot LTER data manager
For methodology questions, contact Jennifer Morse
INSTAAR, University of Colorado
1560 30th St., UCB 450
Boulder, CO 80309-0450
Search tips: Core Area, Discipline, Site, Variable, Investigator, Year, etc.
1. Use our data freely. All Niwot LTER data products (except some recent data sets for which metadata but not data are available) are released to the public and may be freely copied, distributed, edited, remixed, and built upon under the condition that you provide acknowledgement as described below.
2. Give proper acknowledgement. Publications, models and data products that make use of these data sets must include proper acknowledgement, including citing data sets in a similar way to citing a journal article. See http://www.datacite.org/whycitedata). The following acknowledgment should accompany any publication or citation of these data: Logistical support and/or data were provided by the NSF supported Niwot Ridge Long-Term Ecological Research project and the University of Colorado Mountain Research Station
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Precipitation data were collected on a daily time-scale from the Saddle climate station (3525 m) since 1981. Over time, various circumstances have led to days with missing values. Some of these values were estimated from nearby climate stations for years up to 2008 using the methods described in METHODS.
Study site was the Saddle climate station (3525 m).
1981/7/31 - ongoing
precipitation, qualifying days, precipitation method flag
Elevation: 3500 m
Niwot Ridge (USFS - UNESCO Biosphere Reserve)
Located in: USFS - UNESCO Biosphere Reserve
(Click to learn more about these locations)
More data from: Saddle
Core Data Set: No
Award Or Grant: DEB1027341
The qualifying days variable is the number of days to which a precipitation value pertains.
Missing dates from the Niwot Ridge data set were determined that crossed month or year boundaries for data up to 2008. When such missing dates were found, adjacent sites where data were present were identified in a pre-determined hierarchy (see below).
(Method Flag 1) Daily Ratio Methodology:
Total precipitation for the date in question was calculated for the the period 1981-2008, for both the 'Known Site' and the 'Unknown Site', only for days where daily values existed for both sites (missing values and QD's > 1 were removed). A ratio was determined [Unknown Site : Known Site] based on these totals. This ratio was then multiplied by the value for that date at the 'Known Site' in order to determine the 'Unknown Site' value.
(Method Flag 2)
If there was a known total at the 'Unknown Site' that crossed over into the following month, then the known reported total was kept, and the newly determined values were ratio-ed based upon that known total.
Precipitation data adjacency hierarchy:
To correct saddle precipitation data for seasonal winter blowing snow, please see:
Williams, M. W., T. Bardsley, and M. Rikkers. 1998. Oversampling of snow and overestimation of inorganic nitrogen wetfall using NADP data, Niwot Ridge, Colorado, Atmospheric Environment 32(22):3827-3833.
2011-03-08 to 03-21 Clock not working
2011-04-26 to 05-02 Pen bounced below drum rim
2011-07-17 Pen fell off chart; total for this day likely >= 55 mm
2011-11-25 to 11-28 Pen fell off chart - high winds
2011-11-29 to 12-05 Drum not rotating - frozen in place
2011-12-06 to 12-12 Pen fell off chart
2011-12-31 to 01-03 Bucket frozen in place; underwent melt-freeze; total = 15 mm
2012-06-12 to 06-18 Collector was not working; short in power cable. Does not reflect correct precip amounts
2012-07-05 to 07-10 Pen fell off chart; week total 100 mm
2012-12-11 to 12-18 No ppt recorded - ice frozen under bucket
2012-12-19 Pen not put back on chart to get a weekly total; amt at least 39 mm but probably more
2013-01-01 Precip for 12/26 = 0.05". No precip values for following days. Clock was slow. Total for week = 1.3" = 33 mm
2013-01-08 Clock was not reset. Slow clock. Total ppt for week = 0.50"
2013-01-30 Blowing snow
2013-01-31 Blowing snow
2013-02-01 Blowing snow
2013-02-17 Freeze and melt
2013-03-02 Freeze and melt
2013-03-03 Freeze and melt
2013-03-13 Freeze and melt
2013-03-14 Freeze and partial melt
2013-03-19 Pen and rotating drum both frozen. Total ppt 03/16 - 03/19 = 0.90" (23 mm)
2013-03-26 Unable to change chart; drum frozen to stand and could not pull off without breaking instrument. No rain gauge data this week 03-19 to 03-26
2013-04-01 Did not wind clock; total ppt 03-27 to 04-01 = 0.25" (6 mm)
2013-04-09 Unsure of why clock stopped; total ppt 04-02 to 04-09 = 67 mm
2013-04-11 Freeze and melt
2013-04-23 Clock stopped; total ppt 04-12 to 04-24 = 95 mm
2013-04-30 Clock stopped
2013-05-07 Chart drum broken
2013-05-14 Clock stopped
2013-06-04 Missing; possible slow clock
2013-07-02 Total precip 06-28 to 07-02 = 0.87" (22 mm)
2013-10-19 Freeze and melt
2013-10-21 Freeze and melt
2013-11-05 Pen topped out
2013-12-10 Pen froze/fell off chart
2013-12-27 Freeze and melt
2014-01-21 slow clock; total ppt 1/19 -1/21 = 0mm
2014-02-04 gauge full of snow; data suspect after 1/28
2014-02-11 data suspect: pen hitting lid so total ppt unkown; could be > 17mm
2014-02-18 frozen clock and pen; 2/13-2/18 = missing
2014-02-25 blowing snow froze clock; no data after 2/18
2014-03-04 clock stopped/pen stuck; 2/28-3/4 = missing
2014-03-11 clock frozen; pen fell off chart; no ppt data
2014-03-18 clock frozen
2014-03-21 clock replaced; bucket not replaced
2014-03-25 clock still frozen; replaced 03/21/14
2014-04-08 clock stopped/ total ppt 4/5-4/8 = 34mm
2014-04-15 clock stopped/frozen; ppt 4/14 and 4/15 = missing
2014-04-29 clock likely stuck due to melt/freeze; ppt 4/29 = missing
2014-05-27 clock stopped turning; total for 5/24 -5/27 = 28mm
2014-07-01 ink ran out, total ppt 6/28-7/1 = 3mm
2014-07-08 pen fell off chart; ppt 7/3 - 7/8 = 4mm
2014-07-20 clock stopped and restarted; data interpretation suspect for this week
2014-07-25 clock did not turn 7/22 - 7/25; total ppt = 1mm
2014-08-17 slow clock; ppt 8/17 - 8/19 = 1mm
2014-09-28 slow clock; total ppt 9/28-9/30 = 33mm
2014-10-21 no ppt recorded 10/21 - 10/22
2014-11-18 clock packed with snow; ppt data 11/18 = missing
2014-12-02 data suspect; unable to determine turn-around point of pen; total ppt could be > than 37 mm recorded on chart
2014-12-09 clock stopped; total ppt 12/3 - 12/9 = 3mm
2014-12-16 data suspect; possible slow clock; moved chart interpretation +12 hours after slow clock event based on timing of 12/14 ppt event (compared w/ d1 and c1 chart data)
2014-12-22 pen above top of drum; ppt data 12/22 = missing
No infilling for 2009 to 2014 data was performed.
climate, weather, meteorology, precipitation, climatology, saddle, infilling, chart recorder, Niwot Ridge LTER, NWT, sensor data, long term
COL1. label=date, type=string, units=none, missing value indicator=NaN, minimum=1981-07-31, maximum=, precision=, definition=date (yyyy-mm-dd)
COL2. label=precip, type=real, units=millimeter, missing value indicator=NaN, minimum=0, maximum=, precision=, definition=precipitation (mm)
COL3. label=qdays, type=integer, units=day, missing value indicator=NaN, minimum=1, maximum=, precision=1, definition=qualifying days
COL4. label=method_flag, type=integer, units=none, missing value indicator=NaN, minimum=, maximum=, precision=1, definition=precipitation method flag
*Note: To ask a question about data content, please contact the data manager HERE
To ask a question about methodology, please contact Jennifer Morse,
Greenland, D.E. 1987. The climate of Niwot Ridge. University of Colorado Long-Term Ecological Research Data Report 87/7.
The initial iteration of this file was generated by Todd Ackerman over the course of March - November 2006. The file was put under sccs control on 15 November 2006.[TMA 15 November 2006] Data for 2005 and 2006 were appended to the data section.[TMA 05 February 2007] Data for 2007 were appended to the data section.[TMA 31 March 2007] Data for 2008 were appended to the data section.[TMA 9 February 2009] Data for 2009 and 2010 were appended to the data section.[HCH 11 December 2011] 2011 and 2012 data were appended; title, keywords, comments, and cols were edited. Dates were changed to yyyy-mm-dd and missing values to NaN. Notes for 2011 and 2012 were appended to the metadata section.[HCH 30 June 2013] Data for 2013 were appended to the data section. Notes for 2013 were appended to the metadata section. Column labels were shortened and definitions added.[HCH 22 November 2014] Data and notes for 2014 were appended [HCH 22 June 2015]
Losleben, Mark. 2017. Precipitation data for Saddle chart recorder from 1981/7/31 - ongoing, daily. http://niwot.colorado.edu
This material is based upon work supported by the National Science Foundation under Cooperative Agreement #DEB-1637686. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necesarily reflect the views of the National Science Foundation.
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