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.
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Temperature data were collected on a daily time-scale from the D1 climate station (3743 m) since 1952. Over time, various circumstances have led to days with missing values. Some of these missing values were estimated from redundant sensors and nearby climate stations using various methods. Greenland 1987 was a methodology basis; however when it was not possible to use this methodology, new methods were developed.
Study site was D1 climate station (3743 m).
1952-10-1 to ongoing
maximum air temperature, minimum air temperature, mean air temperature
Elevation: 3750 m
Niwot Ridge (USFS - UNESCO Biosphere Reserve)
Located in: USFS - UNESCO Biosphere Reserve
(Click to learn more about these locations)
More data from: D1
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 --->
(Method Flag 1) Regression Methodology:
A 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 filling the missing site. A r^2 value above 0.6 were considered acceptable. If the r^2 was below 0.6, or missing, a Standard Deviation Method was used to fill 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) Dp211 Data Logger
(2) Cr21x Data Logger
(3) Saddle (SDL) Chart Recorder
(4) C1 Chart Recorder
(5) Allenspark (AP) adjusted to C1, then from C1 to D1 with the same method.
(6) Longmont (LNG)
(7) Berthoud (BTD)
2013-04-09 Slow clock? Unable to determine when or for how long
2013-10-02 Slow clock
2013-11-14 Slow clock
2013-11-15 Slow clock (battery dead) 11/15 - 12/12; max=-6, min=-18
2014-01-21 Pen fell off chart
2014-04-01 Pen fell off chart
2014-04-02 Pen fell off chart
2014-04-03 Pen fell off chart
2014-04-04 Pen fell off chart
2014-04-05 Pen fell off chart
2014-04-06 Pen fell off chart
2014-04-09 Pen fell off chart
2014-04-17 Pen fell off chart
2014-04-18 Pen fell off chart
2014-04-19 Pen fell off chart
2014-04-20 Pen fell off chart
2014-04-21 Pen fell off chart
2014-04-22 Pen fell off chart
2014-04-23 Pen fell off chart
2014-04-24 Pen fell off chart
2014-07-23 Missing chart
2014-07-24 Missing chart
2014-07-25 Missing chart
2014-07-26 Missing chart
2014-07-27 Missing chart
2014-07-28 Missing chart
2014-07-29 Missing chart
2014-07-30 Missing chart
2014-07-31 Missing chart
2014-08-01 Missing chart
2014-08-02 Missing chart
2014-08-03 Missing chart
2014-08-04 Missing chart
2014-12-22 Pen fell off chart
2014-12-23 Pen fell off chart
2014-12-25 Pen fell off chart
2014-12-26 Pen fell off chart
2014-12-27 Pen fell off chart
2014-12-28 Pen fell off chart
2014-12-29 Pen fell off chart
2014-12-30 Pen fell off chart
2014-12-31 Pen fell off chart
No infilling for 2009 to 2014 data was performed.
climate, weather, meteorology, air temperature, climatology, d1, infilling, chart recorder, Niwot Ridge LTER, NWT, long term
COL1. label=date, type=string, units=none, missing value indicator=NaN, minimum=1952-10-01, 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 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 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 12 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] 2013 and 2014 data were appended. Chart notes were appended to the methods section.[HCH 14 June 2015] Type was corrected.[HCH 22 May 2016] Temperature units changed to celsius.[HCH 27 April 2017]
Losleben, Mark. 2017. Air temperature data for D1 chart recorder from 1952-10-1 to 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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