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
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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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Air temperature 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 redundant sensors and nearby climate stations. Greenland 1987 was a basis for the methodology; however when it was not possible to use this methodology, new methods were developed.
Study site was the Saddle climate station (3525 m).
1981/7/9 - ongoing
maximum air temperature, minimum air temperature, mean air temperature
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, DEB1637686
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 based on a pre-determined hierarchy (see below).
Niwot data files used in compilation of summary:
1 Climate report data --->
2 Chart recorder temperature data --->
3 Dp211 data --->
4 Cr21x data
(Method flag 1) regression methodology:
Regression was performed using the chart recorder data at the missing site and the adjacent site using a 14 day window prior to and after the missing day. The regression equation was applied to the value at the known site to determine the value for infilling the missing site. An r2 value above 0.6 was considered acceptable. If the r2 was below 0.6 or missing, the standard deviation method was used to fill in the missing value (see Method Flag 2).
(Method flag 2) standard deviation methodology:
Ratios of known site values and standard deviations were used in order to determine the replacement values. The standard deviation was taken for the day (mm-dd) in question throughout the climate record at both the known site and the unknown site and applied as follows:
# known site date value (yyyy-mm-dd) (x)
# ______________________________________________ : __________________________________________________
# std. dev. of the day (mm-dd) at the known site std. dev. of the day (mm-dd) at the unknown site
Temperature data adjacency hierarchy (if value missing from charts):
(1) Saddle dp211 data logger
(2) Saddle cr21x data logger
(3) D1 chart recorder
2012-06-08 to 2012-06-18 Slow clock or drum got stuck; lots of flies in the drum
2012-06-19 to 2012-06-25 Clock did not work, had to replace batts; week high = 16 deg.; low = 0 deg.
2012-07-17 to 2012-07-23 Slow clock; temp high = 15 deg., low = 5 deg.
2012-07-24 to 2012-07-30 Drum not turning, daily values lost; week high = 18 deg.; low = 6 deg.
2012-07-31 to 2012-08-06 Drum not spinning; broken; week high = 20 deg.; low = 5 deg.
2012-08-07 to 2012-08-21 Slow clock; high = 18 deg.; low = 1 deg.
2012-09-29 t0 2012-10-15 Slow clock; all temps missing
2012-10-09 to 2012-10-16 Slow clock; high = 11 deg.; low = -5 deg.
2012-10-16 to 2012-10-23 Slow clock; high = 9 deg.; low = -11 deg.
2012-12-12 to 2012-12-26 Hygrothermograph packed with snow; pen frozen; all temps missing
2013-01-29 to 2013-02-01 Temp data suspect; pen possibly frozen
2013-02-22 Calibration with pacer hydrometer T=-9; no changes made
2013-03-03 Calibration of temp with pacer hydrometer
2013-05-01 to 2013-05-08 Slow clock; week max = 5; min = -19
2013-05-08 to 2013-05-10 Slow clock
2013-07-24 to 2013-07-31 Clock stopped; week max = 19; min = 4
2013-09-18 to 2013-09-25 Slow clock; week max = 12, min = -4
2013-10-02 to 2013-10-09 Clock broken; week max = 10; min = 5
2013-10-08 to 2013-12-31 Clock broken; no temps for remainder of 2013
2014-01-01 to 2014-03-18 clock broken 20131231-20140318
2014-04-11 to 2014-05-15 pen fell off chart; 4/11-5/15 = missing
2014-06-15 to 2014-06-17 slow clock; max/min 6/15-6/17 = 11/-3
2014-07-02 to 2014-07-08 drum stuck from cluster flies; temp min/max 07/02-07/08 = 18/2
2014-07-09 to 2014-07-22 cluster flies prevented any recording this week (drum stuck)
2014-07-23 to 2014-07-29 clock stopped - could be due to cluster flies
2014-07-30 to 2014-08-05 clock stopped again - changed batteries
2014-08-06 to 2014-08-11 battery clock stopped working; replaced with wind up clock on 08/19
2014-08-20 to 2014-08-25 chart missing
2014-09-04 to 2014-09-09 clock stopped; max/min 09/04-09/09 = 12/1
2014-10-01 to 2014-10-06 clock not wound
2014-11-26 to 2014-12-02 drum stopped rotating; max/min for 11/26-12/02 = 2/-12
2014-12-02 to 2014-12-15 drum stopped rotating; max/min for 12/02-12/09 = 0/-8
No infilling was necessary for 2009 data.
No infilling for 2010 to 2014 data was performed.
climate, weather, meteorology, climatology, temperature, saddle, infilling, chart recorder, Niwot Ridge LTER, NWT, sensor data, long term
COL1. label=date, type=string, units=none, missing value indicator=NaN, minimum=1981-07-09, maximum=, precision=, definition=date (yyyy-mm-dd)
COL2. label=max_temp, type=real, units=celsius, missing value indicator=NaN, minimum=, maximum=, precision=, definition=maximum air temperature
COL3. label=maxtemp_flag, type=integer, units=none, missing value indicator=NaN, minimum=, maximum=, precision=1, definition=maximum air temperature infilling method flag
COL4. label=min_temp, type=real, units=celsius, missing value indicator=NaN, minimum=, maximum=, precision=, definition=minimum air temperature
COL5. label=mintemp_flag, type=integer, units=none, missing value indicator=NaN, minimum=, maximum=, precision=1, definition=minimum air temperature infilling method flag
COL6. label=mean_temp, type=real, units=celsius, missing value indicator=NaN, minimum=, maximum=, precision=, definition=mean air temperature
*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] 2005 and 2006 data were appended to the data section.[TMA 21 February 2007] 2007 data were appended to the data section.[TMA 19 March 2008] 2008 data were appended.[TMA 9 February 2009] 2009 and 2010 data were appended.[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.[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] Temperature units changed to celsius.[HCH 27 April 2017]
Losleben, Mark. 2017. Air temperature data for Saddle chart recorder from 1981/7/9 - 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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