# file: nwr_F12_MM.dat # date: 2023-08-29 # # Chlorofluorocarbon-12 (F12) 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-12 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 2008 # 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 F12 in ppt, uncertainty (unc), std. dev. (sd), number of samples # F12catsNWRyr F12catsNWRmon F12catsNWRm F12catsNWRunc F12catsNWRsd F12catsNWRn 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 nan nan nan 0 2001 6 546.77 1.30 3.05 382 2001 7 546.53 6.26 3.42 600 2001 8 545.55 6.04 2.75 529 2001 9 545.84 2.59 2.96 702 2001 10 545.78 3.62 2.52 708 2001 11 546.78 3.46 2.82 542 2001 12 547.29 3.44 2.95 280 2002 1 548.35 5.67 3.87 38 2002 2 548.79 8.43 4.06 339 2002 3 547.14 4.16 3.70 519 2002 4 544.79 7.75 3.52 622 2002 5 545.51 5.12 4.21 700 2002 6 546.09 1.67 3.08 681 2002 7 545.70 1.20 2.90 708 2002 8 546.68 1.30 2.94 735 2002 9 547.58 1.48 3.02 712 2002 10 546.99 1.48 3.14 720 2002 11 544.14 1.64 3.08 706 2002 12 543.87 1.65 2.63 707 2003 1 542.95 1.87 2.86 648 2003 2 543.50 1.36 2.46 486 2003 3 542.98 1.50 2.05 463 2003 4 542.67 1.18 2.40 684 2003 5 541.24 1.32 2.38 629 2003 6 nan nan nan 0 2003 7 nan nan nan 0 2003 8 544.96 1.41 3.33 306 2003 9 544.60 1.45 3.43 654 2003 10 544.83 1.65 2.85 707 2003 11 544.46 2.06 2.92 707 2003 12 544.14 2.28 3.00 731 2004 1 543.63 1.99 3.39 671 2004 2 544.09 1.85 3.44 659 2004 3 543.63 2.03 2.96 683 2004 4 543.75 1.67 2.60 711 2004 5 543.08 1.56 3.26 606 2004 6 nan nan nan 0 2004 7 543.62 1.76 2.55 291 2004 8 543.29 1.93 2.69 716 2004 9 543.25 2.66 3.44 660 2004 10 543.47 2.30 2.35 592 2004 11 543.02 1.38 1.36 606 2004 12 542.84 1.67 1.64 722 2005 1 542.79 1.68 1.42 615 2005 2 542.74 2.29 1.82 619 2005 3 542.31 1.73 1.52 625 2005 4 542.26 1.32 1.92 673 2005 5 542.36 1.76 1.87 653 2005 6 542.22 2.31 1.66 153 2005 7 543.08 1.25 1.75 588 2005 8 543.02 1.70 2.09 726 2005 9 542.35 3.33 2.74 539 2005 10 541.77 4.64 2.76 421 2005 11 541.46 4.57 2.40 532 2005 12 540.66 3.06 2.15 570 2006 1 539.82 1.49 1.32 670 2006 2 540.25 2.14 1.36 592 2006 3 539.97 3.09 2.05 592 2006 4 540.37 2.46 1.77 601 2006 5 540.64 4.50 3.02 565 2006 6 539.74 3.55 3.00 675 2006 7 540.46 2.75 1.07 48 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 11 536.57 1.32 1.58 447 2007 12 536.64 1.16 1.72 522 2008 1 536.12 1.14 1.57 714 2008 2 535.63 1.17 1.39 655 2008 3 535.23 1.26 1.49 715 2008 4 535.26 1.06 1.30 714 2008 5 535.04 0.95 1.37 724 2008 6 534.85 0.99 1.21 716 2008 7 534.74 1.01 1.23 737 2008 8 534.63 0.92 1.35 692 2008 9 534.29 1.08 1.35 637 2008 10 533.96 1.10 1.30 697 2008 11 534.29 1.02 1.22 590 2008 12 534.09 1.03 1.31 720 2009 1 533.58 1.22 1.54 724 2009 2 533.51 1.15 1.43 635 2009 3 533.15 1.01 1.56 701 2009 4 532.96 1.03 1.49 672 2009 5 532.42 0.92 1.38 721 2009 6 532.25 0.95 1.54 714 2009 7 532.24 1.09 1.31 745 2009 8 532.24 1.01 1.39 731 2009 9 532.25 1.09 1.54 682 2009 10 531.93 1.36 1.53 629 2009 11 531.88 1.06 1.38 710 2009 12 531.64 1.18 1.68 525 2010 1 531.63 1.22 1.42 554 2010 2 531.17 1.20 1.57 381 2010 3 531.06 1.15 1.51 673 2010 4 530.95 1.14 1.49 712 2010 5 530.71 1.02 1.46 724 2010 6 530.69 1.05 1.41 719 2010 7 530.17 0.99 1.38 713 2010 8 529.86 1.18 1.45 734 2010 9 529.71 1.14 1.44 706 2010 10 529.52 1.34 1.60 730 2010 11 529.27 1.26 1.75 707 2010 12 529.10 1.41 1.97 673 2011 1 528.46 1.53 1.87 701 2011 2 528.05 1.77 2.02 646 2011 3 527.80 1.61 2.03 567 2011 4 527.44 1.39 1.93 645 2011 5 527.42 1.33 1.99 381 2011 6 526.90 1.32 1.80 294 2011 7 526.43 1.39 1.93 368 2011 8 526.21 1.86 2.29 657 2011 9 525.98 1.83 2.30 697 2011 10 526.22 1.96 2.29 723 2011 11 525.83 1.97 2.39 580 2011 12 525.41 1.63 2.14 632 2012 1 525.59 1.80 1.94 355 2012 2 nan nan nan 0 2012 3 524.45 1.34 1.41 304 2012 4 524.46 1.11 1.50 687 2012 5 524.12 1.00 1.61 739 2012 6 523.99 1.26 1.65 643 2012 7 523.91 1.26 1.72 627 2012 8 523.85 1.23 1.68 740 2012 9 524.06 0.86 1.14 703 2012 10 523.63 2.00 1.57 540 2012 11 523.49 1.49 1.15 506 2012 12 523.07 1.51 1.35 569 2013 1 523.90 0.86 1.11 658 2013 2 523.55 0.64 1.16 553 2013 3 522.57 2.98 1.51 526 2013 4 521.85 2.00 1.56 688 2013 5 521.76 0.78 0.78 433 2013 6 521.91 0.85 0.75 717 2013 7 521.80 0.93 0.74 621 2013 8 521.45 0.80 0.65 743 2013 9 521.18 3.24 1.87 620 2013 10 520.70 3.53 1.74 714 2013 11 520.53 2.05 1.23 686 2013 12 520.26 2.49 1.63 270 2014 1 519.56 2.46 1.57 346 2014 2 520.57 1.99 1.29 393 2014 3 520.60 1.84 1.21 333 2014 4 519.37 1.75 1.12 576 2014 5 519.03 1.56 0.82 746 2014 6 518.75 0.97 0.65 663 2014 7 518.63 0.89 0.57 732 2014 8 518.37 0.70 0.55 734 2014 9 518.27 0.80 0.57 361 2014 10 518.03 0.88 0.86 728 2014 11 517.74 1.15 0.68 673 2014 12 517.36 1.24 0.70 649 2015 1 516.90 1.00 0.72 684 2015 2 516.33 1.00 0.75 605 2015 3 516.39 1.09 0.60 719 2015 4 516.20 0.90 0.65 705 2015 5 516.05 0.78 0.60 525 2015 6 515.71 0.82 0.67 574 2015 7 515.38 1.59 1.23 29 2015 8 514.63 1.80 1.17 372 2015 9 515.01 1.84 1.11 648 2015 10 515.23 1.37 1.02 722 2015 11 515.28 1.39 0.90 406 2015 12 nan nan nan 0 2016 1 nan nan nan 0 2016 2 nan nan nan 0 2016 3 512.67 1.81 1.89 550 2016 4 512.15 1.66 1.75 338 2016 5 nan nan nan 0 2016 6 511.72 1.08 1.76 202 2016 7 511.11 6.19 2.18 222 2016 8 510.53 1.28 1.76 493 2016 9 510.60 1.86 2.22 691 2016 10 510.80 1.68 2.18 729 2016 11 510.01 2.17 2.30 624 2016 12 509.67 0.89 2.21 683 2017 1 508.87 0.94 1.97 649 2017 2 508.80 1.10 2.13 554 2017 3 508.12 1.31 2.30 520 2017 4 507.88 1.37 2.28 356 2017 5 507.88 1.51 2.13 363 2017 6 508.39 1.37 2.40 357 2017 7 506.83 1.12 2.52 149 2017 8 nan nan nan 0 2017 9 nan nan nan 0 2017 10 507.87 0.62 0.78 119 2017 11 507.74 0.73 0.70 684 2017 12 507.73 0.67 0.74 651 2018 1 507.66 0.63 0.77 707 2018 2 507.42 0.58 0.78 626 2018 3 507.08 0.76 0.91 701 2018 4 506.62 0.92 0.89 707 2018 5 506.18 1.03 0.87 745 2018 6 505.81 1.01 0.93 688 2018 7 505.31 1.33 1.31 352 2018 8 504.83 1.35 1.28 196 2018 9 504.28 1.09 0.86 528 2018 10 504.06 1.96 0.94 136 2018 11 504.51 1.24 0.94 247 2018 12 504.73 1.74 1.01 115 2019 1 nan nan nan 0 2019 2 nan nan nan 0 2019 3 nan nan nan 0 2019 4 502.07 4.97 3.21 84 2019 5 501.47 4.36 2.70 191 2019 6 501.41 7.83 3.07 28 2019 7 499.97 0.95 2.08 527 2019 8 499.48 1.01 2.01 715 2019 9 499.97 1.29 2.41 496 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 5 497.55 15.52 3.67 87 2020 6 496.94 7.68 2.91 481 2020 7 496.97 5.15 2.91 298 2020 8 496.37 5.38 3.07 649 2020 9 496.00 4.39 2.49 388 2020 10 495.70 5.01 2.55 700 2020 11 494.97 5.94 2.60 648 2020 12 493.63 3.84 2.88 380 2021 1 495.28 4.37 2.81 369 2021 2 495.30 3.71 2.62 635 2021 3 494.76 3.46 2.24 443 2021 4 494.52 3.55 2.16 548 2021 5 493.54 3.75 1.83 638 2021 6 492.70 4.32 2.20 612 2021 7 492.49 4.00 2.63 435 2021 8 492.71 3.53 2.17 303 2021 9 491.84 3.70 2.24 486 2021 10 491.57 4.11 2.22 491 2021 11 nan nan nan 0 2021 12 492.54 2.45 2.22 422 2022 1 491.52 1.81 2.03 616 2022 2 491.30 1.77 2.20 661 2022 3 492.67 1.94 2.31 411 2022 4 491.38 1.97 2.32 344 2022 5 488.93 2.30 2.25 323 2022 6 489.30 2.28 1.95 349 2022 7 489.58 1.61 2.45 207 2022 8 488.80 1.80 1.86 639 2022 9 488.80 1.81 1.84 720 2022 10 487.96 2.23 2.19 690 2022 11 487.00 1.60 2.30 716 2022 12 486.50 1.32 2.28 708 2023 1 485.91 1.26 2.32 636 2023 2 485.98 1.33 2.36 378 2023 3 484.90 2.06 2.32 423 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