The Aspen FACE site operates as a DOE User Facility. Core funding for the User Facility has been provided by the Office of Science (BER), U.S. Department of Energy, the USFS Northern Research Station, and the USFS Northern Global Change Program. The Northern Forest Ecosystem Experiment (NFEE) is funded by the US Forest Service.

 

Month	Scheduled Hours	Operating Hours	Operating Time (% of Scheduled)	On-Site Users	Data Status	Comments
September 2010	0	0	0	N/A	Preliminary	System off
June 2010	0	0	0	N/A	Preliminary	Restart
October 2009	0	0	0	N/A	Preliminary	System off
September 2009	0	0	0	N/A	Preliminary	System off
August 2009	0	0	0	N/A	Preliminary	System off
July 2009	N/A	N/A	99.0	N/A	Final	Harvest Ring 1.4 shut down July 6, Ring 1.1 shut down July 13, Ring 3.4 shut down July 15, Ring 3.3 shut down July 22, Ring 3.2 shut down July 28, Ring 3.1 shut down July 28
June 2009	N/A	N/A	99.6	N/A	Final	Harvest Ring 2.1 shut down June 7, Ring 2.3 shut down June 9, Ring 2.4 shut down June 13, Ring 2.2 shut down June 21, Ring 1.3 shut down June 27, Ring 1.2 shut down June 30
May 2009	211.7	206.3	97.4	43	Final	Restart (May 15)
April 2009	0	0	0	N/A	Final	System off (winter)
March 2009	0	0	0	N/A	Final	System off (winter)
February 2009	0	0	0	N/A	Final	System off (winter)
January 2009	0	0	0	N/A	Final	System off (winter)
December 2008	0	0	0	N/A	Final	System off (winter)
November 2008	0	0	0	N/A	Final	System off (winter)
October 2008	72.6	72.5	99.7	N/A	Final	System shut down (10/9/08)
September 2008	164.3	164.3	99.9	31	Final	N/A
August 2008	387.2	384.6	99.3	31	Final	N/A
July 2008	426.3	411.4	96.5	75	Final	N/A
June 2008	416.4	410.4	98.6	39	Final	N/A
May 2008	104.3	101.7	97.5	22	Final	Restart (May 23)
April 2008	0	0	0	11	Final	System off (winter)
March 2008	0	0	0	2	Final	System off (winter)
February 2008	0	0	0	1	Final	System off (winter)
January 2008	0	0	0	4	Final	System off (winter)
December 2007	0	0	0	3	Final	System off (winter)
November 2007	0	0	0	9	Final	System off (winter)
October 2007	0	0	0	23	Final	System off (winter)
September 2007	164.3	164.3	100	13	Final	System shut down (9/19/07)
August 2007	381.9	370.9	97.3	33	Final	N/A
July 2007	282.9	278.8	98.5	38	Final	N/A
June 2007	345.7	341.0	98.6	27	Final	N/A
May 2007	203.5	202.0	99.2	21	Final	N/A
April 2007	0	0	0	6	Final	System off (winter)
March 2007	0	0	0	8	Final	System off (winter)
February 2007	0	0	0	3	Final	System off (winter)
January 2007	0	0	0	3	Final	System off (winter)
December 2006	0	0	0	2	Final	System off (winter)
November 2006	0	0	0	8	Final	System off (winter)
October 2006	4.0	4.0	100.0	18	Final	System shut down (10/1/06)
September 2006	308.8	305.4	98.9	24	Final	N/A
August 2006	393.7	389.4	98.9	36	Final	N/A
July 2006	427.8	419.5	98.1	38	Final	N/A
June 2006	417.4	411.6	98.6	34	Final	N/A
May 2006	223.2	223.0	99.9	17	Final	Restart (May 14)
April 2006	0	0	0	14	Final	System off (winter)
March 2006	0	0	0	6	Final	System off (winter)
February 2006	0	0	0	3	Final	System off (winter)
January 2006	0	0	0	0	Final	System off (winter)
December 2005	0	0	0	2	Final	System off (winter)
November 2005	0	0	0	10	Final	System off (winter)
October 2005	104.5	94.6	90.5	25	Final	System shut down (10/12/05)
September 2005	333.7	329.5	98.8	26	Final	N/A
August 2005	394.2	390.9	99.2	37	Final	N/A
July 2005	427.7	412.8	96.5	40	Final	N/A
June 2005	421.1	400.3	95.1	35	Final	N/A
May 2005	123.6	119.4	96.6	23	Final	Restart (May 23)
April 2005	0	0	0	13	Final	System off (winter)
March 2005	0	0	0	7	Final	System off (winter)
February 2005	0	0	0	2	Final	System off (winter)
January 2005	0	0	0	2	Final	System off (winter)
December 2004	0	0	0	3	Final	System off (winter)
November 2004	0	0	0	14	Final	System off (winter)
October 2004	121.0	117.3	96.9	17	Final	System shut down (10/17/04)
September 2004	290.8	286.7	98.6	21	Final	N/A
August 2004	380.7	374.1	98.3	31	Final	N/A
July 2004	427.0	421.0	98.8	35	Final	N/A
June 2004	398.0	388.9	97.7	22	Final	N/A
May 2004	136.6	133.7	97.9	23	Final	Restart (May 21)
April 2004	0	0	0	28	Final	System off (winter)
March 2004	0	0	0	1	Final	System off (winter)
February 2004	0	0	0	3	Final	System off (winter)
January 2004	0	0	0	2	Final	System off (winter)
December 2003	0	0	0	3	Final	System off (winter)
November 2003	0	0	0	12	Final	System off (winter)
October 2003	94.6	87.6	92.6	16	Final	System shut down (10/11/03)

Notes

Scheduled hours are the total number of daylight hours in the month, except for occasional periods when the CO2 was deliberately turned off for specific scientific objectives.
Operating hours are the scheduled hours when the CO2 exposure system was functioning properly.
The percent operating is the operating hours divided by scheduled operating hours, averaged across 6 CO2 rings.
On-site users are the number of principal investigators and co-investigators who were physically present at the FACE site in the given month. The tally does not include investigators analyzing samples or data from the site in their home laboratory. Multiple visits by single investigators for a given month are considered a single user.