# file: nwr_F11_MM.dat # date: 2023-08-29 # # Chlorofluorocarbon-11 (F11) data from hourly in situ samples analyzed on a gas chromatograph located # at Niwot Ridge (NWR), Colorado (C-1 site: 40.04 N, 105.54 W, elevation: 3018 m) # # Atmospheric measurements from the NOAA/GML Chromatograph for Atmospheric Trace # Species (CATS) program. This GC replaces the RITS GCs operated during the # period of 1986 through 2000. This work was funded in part by the Atmospheric Chemistry Project of # NOAA's Climate and Global Change Program. # # Data use policy see https://gml.noaa.gov/hats/hats_datause.html # # Citation: # G.S. Dutton and B.D. Hall (2023), # Global Atmospheric Chlorofluorocarbon-11 Dry Air Mole Fractions from the # NOAA GML Halocarbons in situ Network, 1998-2023, Version: 2023-08-29, # https://doi.org/10.7289/V5X0659V # # For contact information see https://gml.noaa.gov/about/stafflist.html # # Calibration scale used: NOAA 2016 # More information about the calibration scale can be found at: https://gml.noaa.gov/ccl/ # # See (http://www.esrl.noaa.gov/gmd/obop/) for station statistics and personnel. # # The CATS GCs sample air once an hour. Monthly median data are provided in parts-per-trillion, ppt. # Abbreviations used: # yr=year, mon=month, m=monthly data; gc=type of sample--in situ GC data, sd=standard deviation of samples, # n=number of samples, brw=Pt. Barrow, Alaska, sum=Summit, Greenland, nwr= Niwot Ridge, Colorado # mlo=Mauna Loa, Hawaii, smo = American Samoa, spo=South Pole, Antarctica # NAN=not a number or no data, and space(s) is the delimiter. # # The standard deviation (unc) reported is the estimate of insturmental precision. # The standard deviation (sd) reported is the estimate of atmospheric variability. # # year, month, monthly median of F11 in ppt, uncertainty (unc), std. dev. (sd), number of samples # F11catsNWRyr F11catsNWRmon F11catsNWRm F11catsNWRunc F11catsNWRsd F11catsNWRn 1998 1 nan nan nan 0 1998 2 nan nan nan 0 1998 3 nan nan nan 0 1998 4 nan nan nan 0 1998 5 nan nan nan 0 1998 6 nan nan nan 0 1998 7 nan nan nan 0 1998 8 nan nan nan 0 1998 9 nan nan nan 0 1998 10 nan nan nan 0 1998 11 nan nan nan 0 1998 12 nan nan nan 0 1999 1 nan nan nan 0 1999 2 nan nan nan 0 1999 3 nan nan nan 0 1999 4 nan nan nan 0 1999 5 nan nan nan 0 1999 6 nan nan nan 0 1999 7 nan nan nan 0 1999 8 nan nan nan 0 1999 9 nan nan nan 0 1999 10 nan nan nan 0 1999 11 nan nan nan 0 1999 12 nan nan nan 0 2000 1 nan nan nan 0 2000 2 nan nan nan 0 2000 3 nan nan nan 0 2000 4 nan nan nan 0 2000 5 nan nan nan 0 2000 6 nan nan nan 0 2000 7 nan nan nan 0 2000 8 nan nan nan 0 2000 9 nan nan nan 0 2000 10 nan nan nan 0 2000 11 nan nan nan 0 2000 12 nan nan nan 0 2001 1 nan nan nan 0 2001 2 nan nan nan 0 2001 3 nan nan nan 0 2001 4 nan nan nan 0 2001 5 258.84 0.82 1.57 711 2001 6 258.61 0.54 1.45 626 2001 7 258.43 0.60 1.43 727 2001 8 258.27 0.59 1.63 709 2001 9 258.24 0.61 1.20 687 2001 10 258.19 0.88 0.80 734 2001 11 258.43 0.74 1.44 696 2001 12 258.12 0.84 0.80 614 2002 1 258.06 1.13 1.89 536 2002 2 257.57 1.90 1.10 595 2002 3 257.46 1.12 1.05 680 2002 4 257.03 1.34 1.48 671 2002 5 256.71 1.07 1.85 713 2002 6 256.53 0.30 1.68 703 2002 7 256.60 0.20 1.82 697 2002 8 256.64 0.22 1.53 733 2002 9 256.62 0.24 2.34 698 2002 10 256.35 0.38 0.98 708 2002 11 255.60 0.58 0.57 701 2002 12 255.53 0.62 0.69 709 2003 1 255.23 0.82 0.74 654 2003 2 255.13 0.57 0.64 496 2003 3 254.73 0.76 0.63 455 2003 4 254.47 0.41 0.90 681 2003 5 254.07 0.56 0.88 623 2003 6 254.05 0.33 1.03 493 2003 7 253.96 0.37 1.40 594 2003 8 254.44 0.47 1.45 730 2003 9 254.28 0.55 2.21 665 2003 10 254.36 0.61 1.55 704 2003 11 254.15 0.66 0.73 700 2003 12 253.99 0.75 0.74 739 2004 1 253.83 0.63 1.32 697 2004 2 253.74 0.62 0.74 671 2004 3 253.22 0.61 1.94 662 2004 4 253.15 0.50 1.16 704 2004 5 252.75 0.54 1.04 676 2004 6 252.46 0.66 0.93 229 2004 7 252.17 0.90 1.10 297 2004 8 252.43 0.54 1.31 723 2004 9 252.07 1.08 1.83 688 2004 10 252.23 1.17 1.83 594 2004 11 252.23 0.71 1.63 700 2004 12 251.96 0.88 1.10 708 2005 1 251.67 0.77 1.43 656 2005 2 251.67 1.40 1.69 650 2005 3 251.48 1.12 1.44 682 2005 4 251.51 0.89 1.41 698 2005 5 251.07 0.82 1.51 661 2005 6 250.64 0.65 1.72 161 2005 7 250.54 0.46 1.62 594 2005 8 250.35 0.52 1.75 740 2005 9 250.29 0.85 1.48 561 2005 10 249.65 2.31 2.27 461 2005 11 249.38 2.26 1.45 552 2005 12 249.08 1.64 1.27 587 2006 1 248.65 0.90 0.96 659 2006 2 249.04 1.28 1.22 621 2006 3 249.09 1.93 1.98 635 2006 4 248.56 1.42 1.83 618 2006 5 249.04 0.97 1.42 578 2006 6 248.08 0.77 1.31 652 2006 7 249.17 1.06 2.03 113 2006 8 nan nan nan 0 2006 9 nan nan nan 0 2006 10 nan nan nan 0 2006 11 nan nan nan 0 2006 12 nan nan nan 0 2007 1 nan nan nan 0 2007 2 nan nan nan 0 2007 3 nan nan nan 0 2007 4 nan nan nan 0 2007 5 nan nan nan 0 2007 6 nan nan nan 0 2007 7 nan nan nan 0 2007 8 nan nan nan 0 2007 9 nan nan nan 0 2007 10 nan nan nan 0 2007 11 245.46 0.24 0.37 456 2007 12 245.02 0.25 0.39 458 2008 1 244.97 0.25 0.34 734 2008 2 244.80 0.23 0.44 697 2008 3 244.59 0.20 0.30 732 2008 4 244.45 0.20 0.40 718 2008 5 244.25 0.16 0.74 722 2008 6 244.09 0.17 1.33 718 2008 7 243.95 0.16 1.22 739 2008 8 243.83 0.16 0.84 691 2008 9 243.78 0.16 0.83 711 2008 10 243.65 0.20 0.42 740 2008 11 243.40 0.22 0.35 622 2008 12 243.21 0.26 0.30 746 2009 1 243.12 0.27 0.34 733 2009 2 242.95 0.25 0.37 646 2009 3 242.77 0.20 0.39 730 2009 4 242.54 0.18 0.43 675 2009 5 242.18 0.18 0.49 740 2009 6 241.96 0.19 0.67 712 2009 7 241.66 0.20 0.72 725 2009 8 241.66 0.18 0.80 733 2009 9 241.70 0.20 0.93 689 2009 10 241.84 0.20 0.33 633 2009 11 241.90 0.20 0.34 717 2009 12 241.82 0.24 0.44 556 2010 1 241.61 0.21 0.51 568 2010 2 241.51 0.20 0.45 398 2010 3 241.23 0.19 0.49 671 2010 4 240.97 0.19 0.51 712 2010 5 240.82 0.18 1.08 735 2010 6 240.50 0.16 0.92 717 2010 7 240.20 0.17 0.65 711 2010 8 240.08 0.14 0.58 734 2010 9 240.04 0.15 0.43 705 2010 10 240.08 0.17 0.98 730 2010 11 239.86 0.18 0.38 713 2010 12 239.71 0.16 0.55 693 2011 1 239.49 0.26 0.30 713 2011 2 239.32 0.27 0.32 652 2011 3 239.12 0.20 0.36 573 2011 4 239.01 0.15 0.46 711 2011 5 238.74 0.13 0.32 729 2011 6 238.52 0.12 0.59 439 2011 7 238.27 0.15 0.92 327 2011 8 238.27 0.12 0.58 663 2011 9 238.21 0.16 0.48 692 2011 10 238.06 0.17 0.55 712 2011 11 237.97 0.21 0.40 589 2011 12 237.95 0.23 0.34 647 2012 1 237.84 0.23 0.33 357 2012 2 nan nan nan 0 2012 3 237.18 0.20 0.40 311 2012 4 237.08 0.17 0.49 717 2012 5 236.94 0.13 0.64 744 2012 6 236.46 0.14 0.80 633 2012 7 236.30 0.15 0.56 528 2012 8 236.13 0.14 0.45 560 2012 9 236.15 0.13 0.62 713 2012 10 236.08 0.31 0.46 539 2012 11 235.97 0.34 0.35 529 2012 12 235.76 0.34 0.29 393 2013 1 235.39 0.29 0.37 649 2013 2 235.14 0.22 0.26 590 2013 3 nan nan nan 0 2013 4 234.81 0.35 0.67 221 2013 5 234.56 0.23 0.59 440 2013 6 234.64 0.22 0.80 721 2013 7 234.51 0.24 0.60 630 2013 8 234.52 0.20 0.55 735 2013 9 234.45 0.49 0.79 663 2013 10 234.54 0.90 1.07 723 2013 11 234.42 0.54 0.62 690 2013 12 234.51 0.72 0.56 270 2014 1 234.11 0.61 0.49 364 2014 2 234.00 0.58 0.43 405 2014 3 233.85 0.49 0.50 341 2014 4 233.94 0.43 0.41 573 2014 5 233.79 0.37 0.42 741 2014 6 233.70 0.23 0.56 663 2014 7 233.65 0.22 0.55 741 2014 8 233.64 0.20 0.72 741 2014 9 233.79 0.24 2.10 357 2014 10 233.74 0.35 1.62 738 2014 11 233.54 0.44 0.90 717 2014 12 233.29 0.51 0.69 737 2015 1 232.83 0.38 1.49 705 2015 2 232.71 0.37 0.81 670 2015 3 232.37 0.32 0.83 741 2015 4 232.36 0.30 0.91 714 2015 5 232.16 0.28 1.38 518 2015 6 232.13 0.27 1.36 522 2015 7 231.81 0.66 1.72 27 2015 8 232.21 0.84 0.98 353 2015 9 232.33 0.55 1.19 627 2015 10 232.33 0.31 1.00 716 2015 11 232.45 0.39 0.74 400 2015 12 nan nan nan 0 2016 1 nan nan nan 0 2016 2 nan nan nan 0 2016 3 231.12 0.49 0.86 634 2016 4 231.01 0.32 0.85 347 2016 5 nan nan nan 0 2016 6 231.03 0.16 0.89 202 2016 7 nan nan nan 0 2016 8 231.23 0.32 0.59 461 2016 9 231.30 0.52 1.24 658 2016 10 231.17 0.51 1.13 363 2016 11 231.56 0.68 0.74 312 2016 12 231.34 0.20 1.40 357 2017 1 231.13 0.19 0.57 339 2017 2 230.67 0.26 0.55 278 2017 3 230.55 0.37 0.70 181 2017 4 nan nan nan 0 2017 5 nan nan nan 0 2017 6 nan nan nan 0 2017 7 nan nan nan 0 2017 8 nan nan nan 0 2017 9 nan nan nan 0 2017 10 230.75 0.21 0.32 140 2017 11 230.48 0.14 0.26 711 2017 12 230.44 0.13 0.23 695 2018 1 230.32 0.14 0.20 746 2018 2 230.20 0.14 0.22 655 2018 3 229.96 0.17 0.27 740 2018 4 229.82 0.17 0.28 713 2018 5 229.61 0.17 0.28 744 2018 6 229.39 0.16 0.36 672 2018 7 229.34 0.28 0.30 344 2018 8 229.57 0.32 0.48 659 2018 9 229.56 0.27 0.29 481 2018 10 229.29 0.65 0.33 63 2018 11 229.42 0.33 0.24 143 2018 12 229.32 0.39 0.34 56 2019 1 nan nan nan 0 2019 2 nan nan nan 0 2019 3 nan nan nan 0 2019 4 nan nan nan 0 2019 5 nan nan nan 0 2019 6 nan nan nan 0 2019 7 227.29 0.16 0.32 516 2019 8 227.15 0.17 0.26 713 2019 9 227.19 0.32 0.29 353 2019 10 nan nan nan 0 2019 11 nan nan nan 0 2019 12 nan nan nan 0 2020 1 nan nan nan 0 2020 2 nan nan nan 0 2020 3 nan nan nan 0 2020 4 nan nan nan 0 2020 5 224.83 1.54 0.83 182 2020 6 224.51 1.18 0.80 508 2020 7 224.28 0.78 0.65 304 2020 8 224.32 0.73 0.69 674 2020 9 224.46 0.73 0.61 390 2020 10 224.70 1.09 0.67 701 2020 11 224.47 1.16 0.71 664 2020 12 224.17 1.04 0.80 533 2021 1 224.29 1.01 1.17 416 2021 2 nan nan nan 0 2021 3 223.37 0.50 0.56 439 2021 4 223.12 0.55 0.59 548 2021 5 222.86 0.67 0.50 628 2021 6 222.33 0.75 0.73 625 2021 7 221.86 0.59 0.68 522 2021 8 nan nan nan 0 2021 9 221.35 0.45 0.66 472 2021 10 221.18 0.50 0.63 717 2021 11 220.52 1.18 0.83 609 2021 12 220.98 0.56 0.80 449 2022 1 220.82 0.44 0.72 617 2022 2 220.88 0.45 0.76 669 2022 3 220.59 0.41 0.84 413 2022 4 220.70 0.42 0.80 343 2022 5 220.21 0.44 0.82 324 2022 6 219.95 0.43 0.87 351 2022 7 220.10 0.33 0.88 203 2022 8 220.23 0.36 0.72 624 2022 9 220.25 0.43 0.73 701 2022 10 219.93 0.47 0.83 554 2022 11 219.45 0.35 0.59 712 2022 12 219.44 0.29 0.64 712 2023 1 219.05 0.26 0.54 620 2023 2 218.73 0.31 0.63 374 2023 3 218.68 0.39 0.58 404 2023 4 nan nan nan 0 2023 5 nan nan nan 0 2023 6 nan nan nan 0 2023 7 nan nan nan 0 2023 8 nan nan nan 0