\log
The documentation section of this file was developed from the NWT LTER Data
Directory (Symphony files DDABSTRA.WR1, DDDOCUME.WR1, DDMASTER.WR1,
DDVARIAB.WR1; last updated 16 December 1991) by Susan Kindig and Rick
Ingersoll in late January 1993. Data were added by RCI from NC's notes on
12 March 1993.[RCI 12 March 1993] Minor modifications of data and
comments in the data section were provided by Nel Caine and added to
this file by RCI on 15 March 1993.[RCI 17 March 1993] This file was put
under sccs control on 30 March 1993. See the appropriate history file for
additional log information.[RCI 30 March 1993] Data for 18 May to 14
October were provided by Nel Caine on 15 October 1993 and added to the
data section on that date.[RCI 15 October 1993] Data for 28 October
1993 were provided by Nel Caine on 29 October 1993 and added to the
data section on that date.[RCI 29 October 1993] Data for ice clearance
for spring 1994 were provided by Nel Caine on 8 July 1994 and were
added to the data section on 13 July 1994.[RCI 13 July 1994] Data for
1994 freeze-up were provided by Nel Caine on 22 November 1994 and were
appended to the data section on 29 November 1994.[RCI 29 November 1994]
Data for 1995 clearance, 1996 break up, and 1996 clearance provided by
Nel Caine were appended to the data section on 1 April 1997.[MAH 1 April
1997] Clearance Data for 1997 and 1998 provided by Nel Caine were appended
to the data section on 18 November 1998.[MAH 18 November 1998] The
investigator contact information was updated on 9 June 1999.[MAH 9
June 1999] Clearance data for 1999 and 2000 provided by Nel Caine were
appended to the data section on 29 June 2001.[TMA 29 June 2001] Clearance
data for 2001 provided by Nel Caine were appended to the data section on
21 November 2001.[TMA 21 November 2001] Inserted coverage data for 1986
Green Lake 1 and for all lakes 1995 through 2004. Inserted clearance
data for all lakes for 1981, 1983 Green Lake 5, and all lakes for 1999
through 2004. Updated coverage data for all lakes 1983, all lakes 1988,
1990 Green Lake 4, all lakes 1991, 1993 Green Lakes 4 and 5,
1994 Green Lakes 1,2,3 and 5. Updated clearance data for 1992
Green Lake 5, 1993 Green Lakes 1,2, and 5, 1994 Green Lakes 1,4,
and 5, Silverlake.[TMA 17 February 2005] 2005 data were appended to the
data section.[TMA 14 February 2005] 2006 data were appended to the
data section.[TMA 21 May 2007] Added geographic location to LOCATION
section.[TMA 19 July 2007]
\doc
TITLE. Lake-ice clearance and freeze-up in the Green Lakes Valley.
ABSTRACT. Records were based on intermittent observation of the extent of ice
cover on Silver Lake, Lake Albion, and Green Lakes 1-5, dependent on observers
present for other reasons. Dates of freeze-up and lake-ice clearance were
recorded, along with visual estimates of percent ice cover at various dates
prior to complete meltout in spring.
INVESTIGATOR. Nel Caine, INSTAAR, CB 450, University of Colorado, Boulder,
CO, 80309-0450, (303) 492-5053, cainen@colorado.edu.
VARIABLES. lake-ice clearance, lake-ice freeze-up, percent ice cover.
KEYWORDS. freeze-up, hydrology, lake-ice duration, meltout, spring melt, Meteorology and Climatology.
LOCATION. Study areas were Silver Lake, Lake Albion, Green Lakes 1-5.
Green1 40.0508, -105.6056 3431m
Green2 40.0494, -105.6108 3411m
Green3 40.0519, -105.6158 3436m
Green4 40.0553, -105.6203 3566m
Green5 40.0522, -105.6306 3625m
Albion 40.0464, -105.6036 3360m
Silver 40.0294, -105.5825 3141m
Original data are stored at Research Laboratory #1 (Room 213).
TIMING. begin 1981, ongoing, yearly (variable).
CITATIONS. none.
COMMENTS. Additional information, including percent ice cover at various
times in the spring, is available from the investigator. These data are
semi-quantitative and involve a great deal of interpolation and
subjectivity.
Notes:
1983 Albion {melted some in late Oct. before refreezing}
1988 Albion {ice cover was probably complete...}
1988 Green1 {...on Albion and Green Lakes 1-3...}
1988 Green2 {...shortly after the date indicated}
1993 Silver {ice breakup before 20.05}
1994 Green5 {ice clear by 02.07?}
1996 Green3 {clear of ice on 23.05, refroze 30.05}
\type
statistical
\header
COL1. label=year, type=integer, units=none, missing value indicator=,
minimum=1981, maximum=, precision=1
COL2. label=lake, type=string, units=none, missing value indicator=,
minimum=, maximum=, precision=
COL3. label=date ice breakup first observed (dd.mm), type=string, units=none,
missing value indicator=absence of value, minimum=, maximum=, precision=
COL4. label=date ice clearance first observed (dd.mm), type=string,
units=none, missing value indicator=absence of value, minimum=, maximum=,
precision=
COL5. label=date complete ice cover first observed (dd.mm), type=string,
units=none, missing value indicator=absence of value, minimum=, maximum=,
precision=
{*********************************************************************
If the data section below contains no data then you will need to
obtain permission from the investigator listed in the documentation
section of this file. If you have obtained permission or if the data
are already contained in this file, include the following
acknowledgment (in addition to an acknowledgment of the investigator)
in any published use of these data: "Logistical support
and/or data were provided by the Niwot Ridge Long-Term Ecological
Research project (NSF DEB 0423662) and the Mountain Research Station
(BIR 9115097)." Please send 4 reprints or high-quality copies of any
such publications to Todd Ackerman, NWT LTER data manager,
INSTAAR, CB 450, University of Colorado, Boulder, CO, 80309-0450.
The data contained in these files have many sources. Generally,
data collected prior to 1993 would have been subjected to quality
control standards imposed by the investigator. Data after 1992
were likely to have been manually entered and/or processed in the
NWT LTER central data management laboratory. Detailed information
on the quality control protocols and programs associated with any
data routed through the NWT LTER data management laboratory will
be supplied upon request. The user of these data should be aware
that, while efforts have been taken to ensure that these data are
of the highest quality, there is no guarantee of perfection for
the data contained herein and the possibility of errors exists.
If you encounter questionable data, please contact the NWT LTER
data manager (todda@culter.colorado.edu; (303) 492-4771) so that
the data can be corrected or qualified. Thus, these data should
be considered dynamic in that past data may be modified and future
data will be appended.
******************************************************************}
\data
1981,Silver,,,,,,
1981,Albion,,,,03.06,,,
1981,Green1,,,,,,
1981,Green2,,,,,,
1981,Green3,,,,,,,
1981,Green4,,,25.06,,
1981,Green5,,,30.06,,
1982,Silver,,,,,,
1982,Albion,,,15.06,15.10
1982,Green1,,,24.06,10.10
1982,Green2,,,29.06,10.10
1982,Green3,,,29.06,10.10
1982,Green4,,,26.07,10.10
1982,Green5,,,26.07,10.10
1983,Silver,,,18.06,,,
1983,Albion,,,22.06,20.10
1983,Green1,,,23.06,13.10
1983,Green2,23.06,30.06,13.10
1983,Green3,23.06,30.06,13.10
1983,Green4,23.06,27.07,15.10
1983,Green5,23.06,28.07,13.10
1984,Silver,,,07.06,,,
1984,Albion,31.05,21.06,,,
1984,Green1,,,16.06,,,
1984,Green2,,,12.06,,,
1984,Green3,31.05,10.06,,
1984,Green4,26.06,19.07,10.10,
1984,Green5,21.06,26.07,10.10,
1985,Silver,,,30.05,,,
1985,Albion,09.05,03.06,,,
1985,Green1,09.05,09.06,30.09
1985,Green2,09.05,07.06,30.09
1985,Green3,30.05,11.06,30.09
1985,Green4,30.05,06.07,30.09
1985,Green5,30.05,12.07,26.09
1986,Silver,03.06,05.06,,,
1986,Albion,03.06,17.06,03.11
1986,Green1,03.06,19.06,18.10,
1986,Green2,03.06,19.06,16.10
1986,Green3,03.06,21.06,30.10
1986,Green4,19.06,20.07,16.10
1986,Green5,12.06,24.07,16.10
1987,Silver,,,,,,,
1987,Albion,30.04,12.05,,,
1987,Green1,07.05,14.05,,
1987,Green2,,,17.05,,
1987,Green3,14.05,19.05,,
1987,Green4,14.05,27.06,,
1987,Green5,14.05,27.06,,
1988,Silver,,,,,,
1988,Albion,,,30.05,01.11
1988,Green1,,,,,01.11
1988,Green2,,,,,01.11
1988,Green3,,,,,01.11,
1988,Green4,26.05,07.07,05.11
1988,Green5,,,,,03.11
1989,Silver,,,11.05,,
1989,Albion,17.05,03.06,02.11
1989,Green1,18.05,17.06,02.11
1989,Green2,25.05,15.06,02.11
1989,Green3,25.05,18.06,02.11
1989,Green4,30.05,11.07,26.10
1989,Green5,25.05,13.07,26.10
1990,Silver,31.05,03.06,,
1990,Albion,31.05,16.06,,
1990,Green1,07.06,09.06,01.11
1990,Green2,05.06,10.06,01.11
1990,Green3,31.05,10.06,01.11
1990,Green4,14.06,08.07,13.10
1990,Green5,14.06,14.07,11.10
1991,Silver,,,24.05,,
1991,Albion,21.05,27.05,,
1991,Green1,,,21.05,28.10
1991,Green2,24.05,12.06,28.10
1991,Green3,24.05,04.06,28.10
1991,Green4,24.05,08.07,28.10
1991,Green5,24.05,14.07,28.10
1992,Silver,06.05,17.05,03.11
1992,Albion,01.05,23.05,03.11
1992,Green1,,,15.05,03.11
1992,Green2,19.05,26.05,29.10
1992,Green3,01.05,18.05,25.10
1992,Green4,19.05,07.07,25.10
1992,Green5,19.05,21.07,25.10
1993,Silver,20.05,01.06,,
1993,Albion,20.05,17.06,28.10
1993,Green1,18.05,23.06,28.10
1993,Green2,18.05,23.06,28.10
1993,Green3,18.05,15.06,28.10
1993,Green4,25.05,04.08,18.10
1993,Green5,25.05,17.08,11.10
1994,Silver,,,15.05,07.11
1994,Albion,17.05,31.05,29.10
1994,Green1,17.05,28.05,25.10
1994,Green2,17.05,02.06,25.10
1994,Green3,17.05,31.05,24.10
1994,Green4,26.05,29.06,13.10
1994,Green5,26.05,02.07,12.10
1995,Silver,,,19.06,,
1995,Albion,,,02.07,30.10
1995,Green1,,,01.07,,
1995,Green2,,,12.07,,
1995,Green3,,,01.07,,
1995,Green4,,,08.08,05.10
1995,Green5,,,23.08,05.10
1996,Silver,,,21.05,,
1996,Albion,14.05,01.06,05.11
1996,Green1,23.05,15.06,05.11
1996,Green2,14.05,02.06,05.11
1996,Green3,14.05,01.06,05.11
1996,Green4,21.05,17.07,01.10
1996,Green5,21.05,17.07,01.10
1997,Silver,,,27.05,,
1997,Albion,,,14.06,04.11
1997,Green1,,,18.06,23.10
1997,Green2,,,20.06,23.10
1997,Green3,,,18.06,23.10
1997,Green4,,,19.07,18.10
1997,Green5,,,30.07,16.10
1998,Silver,,,04.06,,
1998,Albion,,,17.06,25.10
1998,Green1,,,18.06,19.10,
1998,Green2,,,26.06,19.10
1998,Green3,,,20.06,19.10
1998,Green4,,,19.07,10.10
1998,Green5,,,25.07,08.10
1999,Silver,,,31.05,,
1999,Albion,,,22.06,09.11
1999,Green1,,,22.06,26.10
1999,Green2,,,26.06,28.10
1999,Green3,,,23.06,28.10
1999,Green4,,,14.07,16.10
1999,Green5,,,21.07,26.10
2000,Silver,,,14.05,06.11
2000,Albion,,,24.05,04.11
2000,Green1,,,21.05,02.11
2000,Green2,,,30.05,02.11
2000,Green3,,,24.05,02.11
2000,Green4,,,01.07,31.10
2000,Green5,,,08.07,26.10
2001,Silver,,,12.05,25.12
2001,Albion,,,19.05,25.10
2001,Green1,,,02.06,14.10
2001,Green2,,,08.06,14.10
2001,Green3,,,04.06,26.10
2001,Green4,,,02.07,11.10
2001,Green5,,,14.07,11.10
2002,Silver,,,14.04,05.11
2002,Albion,,,19.05,23.10
2002,Green1,,,02.05,23.10
2002,Green2,,,19.05,18.10
2002,Green3,,,21.05,18.10
2002,Green4,,,08.06,18.10
2002,Green5,,,22.06,23.10
2003,Silver,,,29.05,,
2003,Albion,,,07.06,,
2003,Green1,,,12.06,31.10
2003,Green2,,,15.06,30.10
2003,Green3,,,08.06,30.10
2003,Green4,,,12.07,28.10
2003,Green5,,,18.07,28.10
2004,Silver,,,24.05,11.11
2004,Albion,,,31.05,06.11
2004,Green1,,,31.05,31.10
2004,Green2,,,12.06,31.10
2004,Green3,,,08.06,31.10
2004,Green4,,,07.07,27.10
2004,Green5,,,15.07,21.10
2005,Silver,,,20.05,15.11
2005,Albion,,,29.05,08.11
2005,Green1,,,30.05,03.11
2005,Green2,,,12.06,07.11
2005,Green3,,,10.06,07.11
2005,Green4,,,15.07,05.11
2005,Green5,,,23.07,04.11
2006,Silver,,,11.05,,
2006,Albion,,,04.06,22.10
2006,Green1,,,04.06,22.10
2006,Green2,,,04.06,22.10
2006,Green3,,,02.06,17.10
2006,Green4,,,06.06,15.10
2006,Green5,,,09.07,15.10