# file: mlo_F12_MM.dat # date: 2023-08-29 # # Chlorofluorocarbon-12 (F12) data from hourly in situ samples analyzed on a gas chromatograph located # at Mauna Loa (MLO), Hawaii (19.539 N, 155.578 W, elevation: 3397 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 # F12catsMLOyr F12catsMLOmon F12catsMLOm F12catsMLOunc F12catsMLOsd F12catsMLOn 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 10 543.37 1.07 0.69 242 2000 11 543.07 1.14 1.11 347 2000 12 543.06 1.02 0.75 625 2001 1 543.01 1.15 0.73 406 2001 2 542.76 0.98 0.85 645 2001 3 542.73 0.93 0.73 728 2001 4 542.30 0.95 0.74 694 2001 5 542.57 0.85 0.72 720 2001 6 542.50 0.86 0.80 344 2001 7 542.38 0.87 0.67 630 2001 8 542.81 0.87 0.67 711 2001 9 543.00 0.80 0.73 698 2001 10 543.57 0.87 0.78 723 2001 11 543.70 0.94 0.77 703 2001 12 543.61 1.20 0.81 636 2002 1 543.43 1.06 0.70 655 2002 2 543.08 1.07 0.85 652 2002 3 542.99 1.10 0.77 723 2002 4 543.07 1.14 0.78 707 2002 5 543.06 1.01 0.73 692 2002 6 544.11 0.94 0.84 713 2002 7 543.70 0.97 0.79 684 2002 8 543.72 1.18 0.83 676 2002 9 543.92 1.23 0.95 585 2002 10 544.31 1.22 1.16 705 2002 11 544.63 1.26 0.97 680 2002 12 544.31 1.24 0.91 699 2003 1 544.08 1.16 0.90 669 2003 2 543.60 0.83 0.78 640 2003 3 543.44 1.08 0.86 699 2003 4 543.26 1.09 0.73 694 2003 5 543.03 0.93 0.76 731 2003 6 542.85 0.91 0.79 694 2003 7 542.87 0.89 0.74 680 2003 8 542.80 0.87 0.72 686 2003 9 543.26 0.92 0.85 646 2003 10 543.32 1.04 0.79 669 2003 11 543.35 1.01 0.72 675 2003 12 543.22 1.06 0.77 728 2004 1 543.00 1.02 0.76 735 2004 2 542.77 1.01 0.86 652 2004 3 542.50 1.08 0.79 663 2004 4 542.59 0.99 0.67 715 2004 5 543.06 0.95 0.89 682 2004 6 543.46 0.88 0.65 667 2004 7 543.43 0.87 0.64 629 2004 8 543.31 1.02 0.67 585 2004 9 543.48 0.89 0.76 648 2004 10 543.61 0.95 0.71 703 2004 11 543.84 1.02 0.76 702 2004 12 543.63 1.06 0.72 679 2005 1 543.26 1.19 0.81 650 2005 2 543.24 1.24 0.82 632 2005 3 543.02 1.21 0.96 715 2005 4 543.09 1.24 0.87 667 2005 5 542.89 1.22 0.91 692 2005 6 542.75 1.17 0.87 677 2005 7 542.45 1.24 0.84 693 2005 8 542.30 3.60 0.86 524 2005 9 542.37 2.53 0.96 646 2005 10 542.66 2.23 0.85 601 2005 11 542.73 4.64 0.87 513 2005 12 542.62 2.64 0.95 301 2006 1 nan nan nan 0 2006 2 nan nan nan 0 2006 3 nan nan nan 0 2006 4 nan nan nan 0 2006 5 nan nan nan 0 2006 6 nan nan nan 0 2006 7 nan nan nan 0 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 8 539.00 3.22 3.54 467 2007 9 538.08 3.86 3.59 617 2007 10 539.30 8.64 4.03 283 2007 11 539.20 5.51 3.51 130 2007 12 538.00 1.49 1.55 225 2008 1 537.71 3.43 2.13 663 2008 2 537.41 2.29 1.95 469 2008 3 nan nan nan 0 2008 4 nan nan nan 0 2008 5 536.94 3.32 3.10 93 2008 6 536.79 4.19 3.58 671 2008 7 536.48 3.54 3.16 691 2008 8 536.75 4.14 3.74 692 2008 9 536.64 4.94 3.87 647 2008 10 536.35 4.23 5.04 590 2008 11 536.28 2.80 3.39 659 2008 12 535.42 1.97 3.80 692 2009 1 535.42 2.44 3.44 643 2009 2 534.97 2.09 4.05 627 2009 3 534.33 2.08 2.11 696 2009 4 534.39 1.78 1.02 690 2009 5 534.24 2.91 1.45 697 2009 6 533.87 3.29 1.26 619 2009 7 533.80 2.23 1.25 684 2009 8 534.31 2.23 1.08 642 2009 9 534.39 3.13 1.43 660 2009 10 533.61 1.99 1.15 727 2009 11 533.61 1.99 1.20 691 2009 12 534.00 2.71 1.26 683 2010 1 534.10 2.47 1.23 666 2010 2 533.96 3.58 1.66 638 2010 3 532.27 2.34 1.64 719 2010 4 533.02 2.54 1.54 663 2010 5 532.67 3.67 1.57 674 2010 6 532.16 3.68 1.62 658 2010 7 531.56 3.94 1.58 660 2010 8 531.45 2.01 1.14 487 2010 9 531.56 3.33 1.63 543 2010 10 531.39 3.21 1.49 704 2010 11 530.86 3.50 1.62 660 2010 12 529.91 2.21 1.33 679 2011 1 530.06 2.40 1.50 558 2011 2 529.07 2.36 1.38 651 2011 3 529.07 2.51 1.59 708 2011 4 528.38 2.20 1.35 665 2011 5 528.18 2.06 1.33 664 2011 6 528.18 2.83 1.61 631 2011 7 528.20 3.51 1.73 712 2011 8 527.47 2.95 1.80 723 2011 9 527.22 2.97 1.69 698 2011 10 527.35 3.00 1.50 724 2011 11 526.83 1.56 1.04 697 2011 12 526.99 2.36 1.38 705 2012 1 527.08 4.47 1.87 708 2012 2 527.43 2.90 1.81 662 2012 3 526.11 2.27 1.57 568 2012 4 525.82 3.31 2.16 702 2012 5 525.87 3.64 2.03 697 2012 6 525.19 3.09 1.89 662 2012 7 524.91 3.81 1.99 708 2012 8 524.67 3.09 1.65 725 2012 9 524.97 4.08 2.05 668 2012 10 526.30 2.54 1.57 675 2012 11 524.93 3.16 1.95 685 2012 12 526.41 1.54 1.39 710 2013 1 526.43 1.20 0.78 654 2013 2 525.37 1.45 1.64 643 2013 3 523.47 3.24 1.94 710 2013 4 522.92 3.04 1.54 702 2013 5 522.29 2.44 1.47 740 2013 6 522.16 3.73 1.90 690 2013 7 521.86 3.00 1.68 673 2013 8 522.48 2.38 1.44 501 2013 9 522.75 3.32 1.65 664 2013 10 521.97 2.74 1.39 714 2013 11 521.80 2.37 1.43 664 2013 12 520.71 2.07 1.37 714 2014 1 520.19 2.43 1.68 707 2014 2 520.96 3.46 2.76 590 2014 3 520.71 2.20 1.33 693 2014 4 520.57 2.51 1.37 678 2014 5 520.14 2.60 1.46 653 2014 6 519.94 3.05 1.54 690 2014 7 nan nan nan 0 2014 8 nan nan nan 0 2014 9 nan nan nan 0 2014 10 nan nan nan 0 2014 11 nan nan nan 0 2014 12 nan nan nan 0 2015 1 nan nan nan 0 2015 2 nan nan nan 0 2015 3 nan nan nan 0 2015 4 nan nan nan 0 2015 5 nan nan nan 0 2015 6 nan nan nan 0 2015 7 nan nan nan 0 2015 8 515.48 1.76 1.24 573 2015 9 515.16 1.13 1.06 686 2015 10 515.09 1.62 1.49 720 2015 11 515.01 1.65 1.64 705 2015 12 515.28 2.12 1.84 675 2016 1 515.41 1.94 1.83 706 2016 2 514.73 2.81 2.11 637 2016 3 513.89 2.77 1.87 603 2016 4 513.82 3.11 2.32 680 2016 5 513.14 2.54 1.97 707 2016 6 512.32 2.20 1.85 700 2016 7 511.95 1.78 1.52 730 2016 8 511.59 1.59 1.47 711 2016 9 511.52 1.52 1.72 666 2016 10 511.48 1.70 1.75 711 2016 11 511.37 2.46 1.72 698 2016 12 510.74 1.77 1.58 653 2017 1 510.60 1.91 1.59 669 2017 2 510.04 3.58 1.54 508 2017 3 509.77 2.20 1.79 670 2017 4 509.56 2.10 2.28 631 2017 5 508.75 1.83 1.88 729 2017 6 508.80 2.61 2.30 711 2017 7 508.38 2.38 2.17 383 2017 8 506.84 1.47 1.42 724 2017 9 507.01 1.32 1.45 708 2017 10 507.17 1.34 1.36 718 2017 11 507.63 1.15 0.98 704 2017 12 507.58 1.12 0.94 720 2018 1 507.46 1.12 0.89 727 2018 2 507.20 0.98 0.83 659 2018 3 506.99 0.92 0.97 710 2018 4 506.74 1.40 1.63 712 2018 5 506.22 1.63 1.54 657 2018 6 506.29 2.06 1.82 687 2018 7 505.47 2.18 1.60 722 2018 8 505.37 2.31 1.45 694 2018 9 505.57 1.54 1.48 715 2018 10 505.40 1.37 1.51 660 2018 11 505.48 1.82 1.79 708 2018 12 505.64 1.57 1.65 727 2019 1 505.63 1.89 1.83 613 2019 2 504.26 1.71 1.75 575 2019 3 504.56 2.40 1.89 692 2019 4 504.00 2.21 1.98 687 2019 5 502.97 2.15 2.32 663 2019 6 501.57 1.69 1.56 720 2019 7 501.06 1.54 1.57 740 2019 8 500.89 1.57 1.48 708 2019 9 500.48 1.60 1.58 675 2019 10 500.08 1.82 1.80 742 2019 11 500.05 1.60 1.67 716 2019 12 499.91 1.85 1.81 601 2020 1 499.50 1.94 1.76 649 2020 2 499.17 2.02 1.92 673 2020 3 498.83 2.17 1.86 667 2020 4 498.48 1.80 1.53 708 2020 5 498.17 1.71 1.57 729 2020 6 497.98 1.82 1.66 711 2020 7 497.64 1.83 1.59 687 2020 8 497.34 2.10 1.75 717 2020 9 497.01 2.08 1.76 701 2020 10 496.75 1.73 1.64 723 2020 11 496.11 1.35 1.77 360 2020 12 495.94 1.69 1.92 710 2021 1 495.01 1.31 1.95 601 2021 2 495.01 1.54 1.93 653 2021 3 494.47 1.29 1.80 684 2021 4 493.53 1.56 1.92 665 2021 5 493.29 1.54 1.78 724 2021 6 492.87 1.79 2.08 560 2021 7 491.67 1.34 1.95 365 2021 8 491.87 1.42 1.84 335 2021 9 492.54 1.92 1.91 422 2021 10 493.19 1.98 1.66 717 2021 11 492.95 1.86 1.85 718 2021 12 492.41 1.47 1.76 672 2022 1 492.06 1.72 2.08 679 2022 2 491.99 2.33 2.25 658 2022 3 491.22 2.25 2.42 726 2022 4 490.60 1.18 1.83 677 2022 5 490.29 1.69 1.97 726 2022 6 489.91 2.56 2.27 678 2022 7 489.16 2.03 1.99 694 2022 8 488.77 1.75 1.94 726 2022 9 488.65 1.97 2.25 643 2022 10 488.61 2.08 1.78 412 2022 11 488.23 1.93 1.98 658 2022 12 nan nan nan 0 2023 1 nan nan nan 0 2023 2 nan nan nan 0 2023 3 nan nan nan 0 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