The U.S. government is closed. This site will not be updated; however, NOAA websites and social media channels necessary to protect lives and property will be maintained.
To learn more, visit commerce.gov.
For the latest forecasts and critical weather information, visit weather.gov.
Observation Sites
Yellow markers indicate discontinued sites
Walnut Grove, California, United States [WGC]
Location
- Country: United States
- Latitude: 38.2645° North
- Longitude: 121.4904° West
- Elevation: 2.00 masl
- Time Zone: Local Standard Time + 8.0 hour(s) = UTC
Data
Cooperating Agencies
Lawrence Berkeley National LaboratoryGML Projects at Walnut Grove, California
| Parameter | Formula | First Sample Date | Status |
|---|---|---|---|
| Carbon Dioxide | CO2 | 2007-09-20 | Ongoing |
| Methane | CH4 | 2007-09-20 | Ongoing |
| Carbon Monoxide | CO | 2007-09-20 | Ongoing |
| Molecular Hydrogen | H2 | 2007-09-20 | Ongoing |
| Nitrous Oxide | N2O | 2007-09-20 | Ongoing |
| Sulfur Hexafluoride | SF6 | 2015-01-26 | Ongoing |
| Sulfur Hexafluoride | SF6 | 2007-09-20 | Ongoing |
| Carbon-13/Carbon-12 in Carbon Dioxide | d13C (CO2) | 2007-09-20 | Ongoing |
| Oxygen-18/Oxygen-16 in Carbon Dioxide | d18O (CO2) | 2007-09-20 | Ongoing |
| Carbon-13/Carbon-12 in Methane | d13C (CH4) | 2008-01-08 | Terminated - 2009-02-24 |
| Carbon-14/Carbon in Carbon Dioxide | D14C (CO2) | 2009-02-24 | Terminated - 2022-12-27 |
| HFC-134a | CH2FCF3 | 2007-09-20 | Ongoing |
| HCFC-22 | CHF2Cl | 2007-09-20 | Ongoing |
| CFC-12 | CCl2F2 | 2007-09-20 | Ongoing |
| Methyl Chloride | CH3Cl | 2007-09-20 | Ongoing |
| CFC-114 | CFC-114 | 2007-09-20 | Ongoing |
| HCFC-142b | CH3CF2Cl | 2007-09-20 | Ongoing |
| Halon-1211 | CBrClF2 | 2007-09-20 | Ongoing |
| Methyl Bromide | CH3Br | 2007-09-20 | Ongoing |
| CFC-11 | CCl3F (ion 101) | 2007-09-20 | Terminated - 2015-12-05 |
| CFC-11 | CCl3F (ion 103) | 2010-08-27 | Ongoing |
| HCFC-141b | CH3CCl2F | 2007-09-20 | Ongoing |
| Methyl Iodide | CH3I | 2007-09-20 | Ongoing |
| CFC-113 | CCl2FCClF2 | 2007-09-20 | Ongoing |
| Dichloromethane | CH2Cl2 | 2007-09-20 | Ongoing |
| Chloroform | CHCl3 | 2007-09-20 | Ongoing |
| Methyl Chloroform | CH3CCl3 | 2007-09-20 | Ongoing |
| Methyl Chloroform | CH3CCl3 | 2010-08-27 | Terminated - 2010-11-21 |
| Carbon Tetrachloride | CCl4 | 2007-09-20 | Ongoing |
| Dibromomethane | CH2Br2 | 2007-09-20 | Ongoing |
| Perchloroethylene (PCE) | C2Cl4 | 2007-09-20 | Ongoing |
| Bromoform | CHBr3 | 2007-09-20 | Ongoing |
| Benzene | C6H6 | 2007-09-20 | Ongoing |
| Carbonyl Sulfide | COS | 2007-09-20 | Ongoing |
| HCFC-21 | CHCl2F | 2015-09-16 | Ongoing |
| HFC-152a | CH3CHF2 | 2007-09-20 | Ongoing |
| HCFC-124 | CHClFCF3 | 2007-09-20 | Ongoing |
| Toluene | C7H8 | 2015-01-26 | Terminated - 2022-09-16 |
| Carbon Disulfide | CS2 | 2007-09-20 | Ongoing |
| Ethane | C2H6 | 2015-01-26 | Ongoing |
| Ethene | C2H4 | 2015-01-26 | Ongoing |
| Propane | C3H8 | 2007-09-20 | Ongoing |
| Propene | C3H6 | 2015-01-26 | Ongoing |
| i-Butane | i-C4H10 | 2015-01-26 | Ongoing |
| n-Butane | n-C4H10 | 2007-09-20 | Ongoing |
| i-Pentane | i-C5H12 | 2007-09-20 | Ongoing |
| n-Pentane | n-C5H12 | 2007-09-20 | Ongoing |
| n-Hexane | n-C6H14 | 2015-01-26 | Ongoing |
| Halon-1301 | CF3Br | 2007-09-20 | Ongoing |
| Halon-2402 | CBrF2CBrF2 | 2007-09-20 | Ongoing |
| HFC-143a | CH3CF3 | 2007-09-20 | Ongoing |
| HFC-227ea | CF3CHFCF3 | 2007-09-20 | Ongoing |
| HFC-365mfc | CH3CF2CH2CF3 | 2007-09-20 | Ongoing |
| CFC-115 | CClF2CF3 | 2007-09-20 | Ongoing |
| HFC-125 | CHF2CF3 | 2007-09-20 | Ongoing |
| CFC-13 | CClF3 | 2007-09-20 | Ongoing |
| Ethyl Chloride | CH3CH2Cl | 2007-09-20 | Terminated - 2015-04-25 |
| HFC-23 | CHF3 | 2007-09-20 | Ongoing |
| PFC-218 | C3F8 | 2007-09-20 | Ongoing |
| Acetylene | C2H2 | 2007-09-20 | Ongoing |
| HFC-32 | CH2F2 | 2009-03-19 | Ongoing |
| HFC-134 | CHF2CHF2 | 2009-03-19 | Ongoing |
| Halon-1011 | CH2BrCl | 2015-01-26 | Ongoing |
| Methyl Chloroform (61) | CH3CCl3 | 2013-12-09 | Terminated - 2015-04-25 |
| PFC-14 | CF4 | 2015-01-26 | Ongoing |
| PFC-116 | CF3CF3 | 2015-01-26 | Ongoing |
| Nitrogen Trifluoride | NF3 | 2015-09-16 | Ongoing |
| Sulfuryl Fluoride | SO2F2 | 2015-09-16 | Ongoing |
| HFC-236fa | CF3CH2CF3 | 2015-01-26 | Ongoing |
| HCFC-133a | CH2ClCF3 | 2015-01-26 | Ongoing |
| CFC-112 | CCl3CClF2 | 2015-01-26 | Ongoing |
| Trichloroethylene (TCE) | C2HCl3 | 2015-01-26 | Ongoing |
| HFO-1234yf | CH2=CFCF3 | 2015-09-16 | Ongoing |
| HFO-1234zeE | CHF=CHCF3 | 2015-09-16 | Ongoing |
| Ethylene Dichloride (1,2 DCE) | CH2ClCH2Cl | 2015-09-16 | Ongoing |
| HCFC-123 | CHCl2CF3 | 2015-09-16 | Ongoing |
| Morpholine | C5F11NO | 2015-09-16 | Ongoing |
| Perfluorotriethylamine (PFTEA) | (C2F5)3N | 2015-09-16 | Ongoing |
| Perfluorotripropylamine (PFTPA) | (C3F7)3N | 2015-09-16 | Ongoing |
| HFC-245fa | 2015-09-16 | Ongoing | |
| CFC-113a | CCl3CF3 | 2022-03-26 | Ongoing |
| PFC-318 | c-C4F8 | 2024-09-21 | Ongoing |
| Parameter | Formula | First Sample Date | Status |
|---|---|---|---|
| Carbon Dioxide | CO2 | 2008-05-23 | Terminated - 2009-03-08 |
| Methane | CH4 | 2008-05-23 | Terminated - 2009-03-08 |
| Carbon Monoxide | CO | 2008-05-23 | Terminated - 2009-03-08 |
| Molecular Hydrogen | H2 | 2008-05-23 | Terminated - 2009-03-08 |
| Nitrous Oxide | N2O | 2008-05-23 | Terminated - 2009-03-08 |
| Sulfur Hexafluoride | SF6 | 2008-05-23 | Terminated - 2009-03-08 |
| Carbon-13/Carbon-12 in Carbon Dioxide | d13C (CO2) | 2008-06-18 | Terminated - 2009-03-08 |
| Oxygen-18/Oxygen-16 in Carbon Dioxide | d18O (CO2) | 2008-06-18 | Terminated - 2009-03-08 |
| Carbon-14/Carbon in Carbon Dioxide | D14C (CO2) | 2009-02-25 | Terminated - 2009-03-07 |
| HFC-134a | CH2FCF3 | 2008-05-23 | Terminated - 2009-03-08 |
| HCFC-22 | CHF2Cl | 2008-05-23 | Terminated - 2009-03-08 |
| CFC-12 | CCl2F2 | 2008-05-23 | Terminated - 2009-03-08 |
| Methyl Chloride | CH3Cl | 2008-05-23 | Terminated - 2009-03-08 |
| CFC-114 | CFC-114 | 2008-05-23 | Terminated - 2009-03-08 |
| HCFC-142b | CH3CF2Cl | 2008-05-23 | Terminated - 2009-03-08 |
| Halon-1211 | CBrClF2 | 2008-05-23 | Terminated - 2009-03-08 |
| Methyl Bromide | CH3Br | 2008-05-23 | Terminated - 2009-03-08 |
| CFC-11 | CCl3F (ion 101) | 2008-05-23 | Terminated - 2009-03-08 |
| HCFC-141b | CH3CCl2F | 2008-05-23 | Terminated - 2009-03-08 |
| Methyl Iodide | CH3I | 2008-05-23 | Terminated - 2009-03-08 |
| CFC-113 | CCl2FCClF2 | 2008-05-23 | Terminated - 2009-03-08 |
| Dichloromethane | CH2Cl2 | 2008-05-23 | Terminated - 2009-03-08 |
| Chloroform | CHCl3 | 2008-05-23 | Terminated - 2009-03-08 |
| Methyl Chloroform | CH3CCl3 | 2008-05-23 | Terminated - 2009-03-08 |
| Carbon Tetrachloride | CCl4 | 2008-05-23 | Terminated - 2009-03-08 |
| Dibromomethane | CH2Br2 | 2008-05-23 | Terminated - 2009-03-08 |
| Perchloroethylene (PCE) | C2Cl4 | 2008-05-23 | Terminated - 2009-03-08 |
| Bromoform | CHBr3 | 2008-05-23 | Terminated - 2009-03-08 |
| Benzene | C6H6 | 2008-05-23 | Terminated - 2009-03-08 |
| Carbonyl Sulfide | COS | 2008-05-23 | Terminated - 2009-03-08 |
| HFC-152a | CH3CHF2 | 2008-05-23 | Terminated - 2009-03-08 |
| HCFC-124 | CHClFCF3 | 2008-05-23 | Terminated - 2009-03-08 |
| Toluene | C7H8 | 2008-05-23 | Terminated - 2008-06-23 |
| Carbon Disulfide | CS2 | 2008-05-23 | Terminated - 2009-03-08 |
| Propane | C3H8 | 2008-05-23 | Terminated - 2009-03-08 |
| n-Butane | n-C4H10 | 2008-05-23 | Terminated - 2009-03-08 |
| i-Pentane | i-C5H12 | 2008-05-23 | Terminated - 2009-03-08 |
| n-Pentane | n-C5H12 | 2008-05-23 | Terminated - 2009-03-08 |
| Ambient Pressure | press | 2008-05-23 | Terminated - 2009-03-08 |
| Relative Humidity | rh | 2008-05-23 | Terminated - 2009-03-08 |
| Halon-1301 | CF3Br | 2008-05-23 | Terminated - 2009-03-08 |
| Halon-2402 | CBrF2CBrF2 | 2008-05-23 | Terminated - 2009-03-08 |
| HFC-143a | CH3CF3 | 2008-05-23 | Terminated - 2009-03-08 |
| HFC-227ea | CF3CHFCF3 | 2008-05-23 | Terminated - 2009-03-08 |
| HFC-365mfc | CH3CF2CH2CF3 | 2008-05-23 | Terminated - 2009-03-08 |
| CFC-115 | CClF2CF3 | 2008-05-23 | Terminated - 2009-03-08 |
| HFC-125 | CHF2CF3 | 2008-05-23 | Terminated - 2009-03-08 |
| CFC-13 | CClF3 | 2008-05-23 | Terminated - 2009-03-08 |
| Ethyl Chloride | CH3CH2Cl | 2008-05-23 | Terminated - 2009-03-08 |
| HFC-23 | CHF3 | 2008-05-23 | Terminated - 2009-03-08 |
| PFC-218 | C3F8 | 2008-05-23 | Terminated - 2009-03-08 |
| Acetylene | C2H2 | 2008-05-23 | Terminated - 2009-03-08 |
Carbon Cycle In Situ Tall Tower
| Parameter | Formula | First Sample Date | Status |
|---|---|---|---|
| Carbon Dioxide | CO2 | 2007-08-25 | Ongoing |
| Methane | CH4 | 2007-09-11 | Ongoing |
| Carbon Monoxide | CO | 2007-08-25 | Ongoing |
Trace gases from GGGRN Airborne Flasks