PSU Ring 2 Well-Calibrated CO2 Sites
| Abbrv. | Lat | Long | Location (contact) | Starting date | Calibration info | Elevation | Measurement height |
| RKW | 41.28 | -89.97 | Kewanee, IL (PSU) | Apr 2007 | CRDS, daily cal | 247 m ASL | 30, 140 m AGL |
| RCE | 40.79 | -92.88 | Centerville, IA (PSU) | Apr 2007 | CRDS, daily cal | 286 m ASL | 30, 110 m AGL |
| RMM | 41.14 | -96.46 | Mead, NE (PSU) | Apr 2007 | CRDS, daily cal | 358 m ASL | 30, 120 m AGL |
| RRL | 43.53 | -95.41 | Round Lake, MN (PSU) | Apr 2007 | CRDS, daily cal | 469 m ASL | 30, 110 m AGL |
| RGV | 44.0910 | -91.3382 | Galesville, WI (PSU) | June 2007 | CRDS, daily cal | 251 m ASL | 30/140 m AGL |
PSU AmeriFlux* Well-Calibrated CO2 Sites
| Abbrv. | Lat | Long | Location (contact) | Starting date | Calibration info | Elevation | Measurement height |
| ACV | 39.06 | -79.42 | Canaan Valley, WV (PSU) | Apr 2006 | 4 cals every 4 hrs / target / archive | 988 m ASL | ~7 m AGL |
| ACR | 35.93 | -84.33 | Chestnut Ridge, TN (PSU) | Sept 2006 | 4 cals every 4 hrs / target / archive | 372.5 m ASL | 61 m AGL |
| AFP | 48.31 | -105.10 | Fort Peck, MT (PSU) | Dec 2006 | 4 cals every 4 hrs / target / archive | 634 m ASL | ~3 m AGL |
| AMO | 38.74 | -92.20 | Ozark, MO (PSU) | Oct 2006 | 4 cals every 4 hrs / target / archive | 219.4 m ASL | ~30 m AGL |
| AMN | 41.16 | -96.47 | Mead, NE (Shashi Verma) | Mar 2006 | 4 cals every 4 hrs / target / archive | 362 m ASL | 3 m AGL (6 m AGL during corn season) |
Additional Well-Calibrated CO2 Sites
| Abbrv. | Lat | Long | Location (contact) | Starting date | Calibration info | Elevation | Measurement height |
| AMT | 45.03440 | -68.68203 | Argyle, ME (Arlyn Andrews) | 2004 or before | 50 m ASL | 12, 107 m AGL | |
| AFC_HOW | 45.20 | -68.74 | Howland, ME (David Hollinger) | 1996 | 60 m ASL | 29 m AGL | |
| HFM | 42.54 | -72.17 | Harvard Forest, MA (Steve Wofsy) | 1991 | 360 m ASL | 30 m AGL | |
| SGP | 36.80 | -97.50 | Southern Great Plains, OK (Mark Fischer) | 2000 | 320 m ASL | 60 m AGL | |
| LEF | 45.95 | -90.27 | WLEF (Arlyn Andrews) | 1994 | 472 m ASL | 11, 30, 76, 122, 244, 396 m AGL | |
| WKT | 31.31444 | -97.32694 | KWKT (Arlyn Andrews) | 2001 | 251 m ASL | 30, 122, 457 m AGL | |
| BAO | 40.050 | -105.010 | Erie, CO (Arlyn Andrews) | May 2007 | 1584 m ASL | 22, 100, 300 m AGL | |
| WBI | 41.72478 | -91.35283 | West Branch, Iowa (Arlyn Andrews) | June 2007 | 241.7 m ASL | 31, 99, 379 m AGL | |
| STR | 37.7553 | -122.4517 | Sutro (STR), CA (Arylyn Andrews) | October 2007 | 254 m ASL | 116, 232 m AGL | |
| SCT | 33.40575 | -81.83347 | South Carolina (Arlyn Andrews/M.Parker (DOE)) | planned | 304.8 m AGL | ||
| WGC | 38.27 | -121.49 | Walnut Grove, California (Arlyn Andrews/M. Fischer (LBNL)) | late summer 2007 | 0 m ASL | 30, 91, 483 m AGL | |
| 38.53333 | -78.43333 | Virginia (Arlyn Andrews/ S. De Wekker (UVA) | planned | ||||
| SPL | 40.45 | -106.73 | Storm Peak Lab,CO (Britt Stephens) | Sept 2005 | 4 cals every 4 hrs / each cal also every 2-3 hrs | 3210 m ASL | 2.5, 5.8, 9.1, m AGL |
| FEF | 39.91 | -105.88 | Fraser Exp Forest,CO (Britt Stephens) | Aug 2005 | 4 cals every 4 hrs / each cal also every 2-3 hrs | 2745 m ASL | 2.6, 9.5, 17.5 m AGL |
| NWR | 40.05 | -105.88 | Niwot Ridge,CO (Britt Stephens) | Aug 2005 | 4 cals every 4 hrs / each cal also every 2-3 hrs | 3523 m ASL | 1.3, 3.5, 5.1 m AGL |
| HDP | 40.56 | -111.64 | Hidden Peak, Snowbird, UT (Britt Stephens) | Apr 2006 | 4 cals every 4 hrs / each cal also every 2-3 hrs | 3351 m ASL | 7.7, 17.1 m AGL |
| AFC_ECU | 38.80 | -109.21 | Entrada Field, UT (Britt Stephens) | Aug 2008 | 4 cals every 4 hrs / each cal also every 2-3 hrs | 1280 m ASL | 7.3, 38.9, 87.5 m AGL |
| AFC_RBA | 36.4614 | -109.0956 | Roof Butte, AZ (Britt Stephens) | Oct 2007 | 4 cals every 4 hrs / each cal also every 2-3 hrs | 2982 m ASL | 3.6, 14.3, 21.9 m AGL |
| AFC_MMI | 39.32 | -86.41 | Morgan-Monroe, IN (Dragoni) | early 2006 | 4 cals every 12 hrs | 275 m ASL | 48 m AGL |
| AFC_FIR | 44.65 | -123.55 | Fir (Summit), OR (Bev Law) | late 2006 | cals every 4 hrs | ||
| AFC_MOR | 44.45 | -121.56 | Metolius, OR (Bev Law) | late 2006 | cals every 4 hrs | 1310 m ASL | 31 m AGL |
| AFC_YAQ | 44.67 | -124.07 | Yaquina Head (Bev Law) | late 2006 | cals every 4 hrs | ||
| ARC_MPK | 44.50 | -123.55 | Mary's Peak (Bev Law) | late 2006 | cals every 4 hrs | ||
| AFC_NGB | 43.45 | -119.72 | NGBER (Burns) (Bev Law) | early 2007 | |||
| BRM | 54.34 | -104.99 | BERMS, Saskatchewan, Canada (Barr, Black, McCaughey) | 1996 | |||
| AFC_WPT | 54.95 | -112.47 | Western Peatland (Larry Flanagan) | March 03 | 540 m ASL | 12 m AGL | |
| AFC_BOR | 55.88 | -98.48 | Manitoba (BOREAS-NOBS) (Steve Wofsy) | March 94 | 259 m ASL | 30 m AGL | |
| MVY | 41.33 | -70.52 | Marthas Vineyard, MA | 0 m ASL | |||
| RMT | 44.6892 | -93.0725 | Rosemont, Minneapolis, MN(Tim Griffis) | May 2007 | TDL cal'd every 12 min using 3 standards;accuracy typ. better than 0.3 ppm | 32, 56, 100, 200 m AGL |
*In addition to the Ring 2 sites, Penn State also collects well-calibrated CO2 measurements in support of AmeriFlux. The Penn State Ameriflux sites are part of what is intended to be a long-term network. There are also additional well-calibrated sites throughout the country.