# file: mlo_CCl4_MM.dat # date: 2023-08-29 # # Carbon tetrachloride (CCl4) 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 Carbon tetrachloride 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 CCl4 in ppt, uncertainty (unc), std. dev. (sd), number of samples # CCl4catsMLOyr CCl4catsMLOmon CCl4catsMLOm CCl4catsMLOunc CCl4catsMLOsd CCl4catsMLOn 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 6 101.00 0.95 0.77 113 1999 7 100.81 0.94 0.79 703 1999 8 100.74 0.92 0.78 635 1999 9 100.95 1.05 0.79 447 1999 10 100.97 1.08 0.76 616 1999 11 100.91 1.02 0.77 573 1999 12 101.01 1.60 0.77 400 2000 1 100.96 1.76 0.83 568 2000 2 100.63 1.60 0.81 566 2000 3 100.58 1.72 0.95 649 2000 4 100.56 1.56 0.88 676 2000 5 100.48 1.60 1.05 540 2000 6 100.66 1.89 1.23 180 2000 7 nan nan nan 0 2000 8 nan nan nan 0 2000 9 nan nan nan 0 2000 10 100.73 0.55 0.47 241 2000 11 100.79 0.33 0.51 315 2000 12 100.66 0.32 0.59 623 2001 1 100.49 0.33 0.36 410 2001 2 100.21 0.28 0.46 639 2001 3 100.22 0.29 0.46 737 2001 4 100.04 0.29 0.42 696 2001 5 99.90 0.28 0.41 719 2001 6 99.58 0.30 0.49 337 2001 7 99.03 0.26 0.39 632 2001 8 98.84 0.27 0.38 718 2001 9 99.10 0.28 0.51 695 2001 10 99.29 0.30 0.47 725 2001 11 99.23 0.29 0.45 705 2001 12 99.03 0.30 0.37 633 2002 1 98.86 0.30 0.39 673 2002 2 98.57 0.32 0.40 644 2002 3 98.49 0.31 0.38 722 2002 4 98.52 0.34 0.38 705 2002 5 98.39 0.32 0.39 696 2002 6 98.84 0.31 0.54 700 2002 7 98.51 0.32 0.48 680 2002 8 98.19 0.35 0.48 684 2002 9 98.50 0.44 0.49 601 2002 10 98.68 0.32 0.57 662 2002 11 98.58 0.30 0.62 681 2002 12 98.31 0.30 0.42 694 2003 1 98.02 0.32 0.47 681 2003 2 98.06 0.20 0.46 639 2003 3 97.59 0.29 0.51 709 2003 4 97.61 0.29 0.38 691 2003 5 97.64 0.28 0.51 730 2003 6 97.53 0.27 0.47 694 2003 7 97.16 0.26 0.48 673 2003 8 97.07 0.27 0.46 705 2003 9 97.51 0.26 0.61 648 2003 10 97.30 0.32 0.57 669 2003 11 97.02 0.31 0.80 691 2003 12 96.87 0.30 0.40 727 2004 1 96.65 0.30 0.36 728 2004 2 96.50 0.28 0.44 663 2004 3 96.37 0.28 0.47 658 2004 4 96.60 0.27 0.50 704 2004 5 96.43 0.29 0.49 693 2004 6 96.04 0.29 0.39 667 2004 7 95.98 0.26 0.40 624 2004 8 95.70 0.27 0.42 592 2004 9 95.88 0.27 0.48 634 2004 10 95.78 0.26 0.48 697 2004 11 95.87 0.26 0.45 696 2004 12 95.64 0.28 0.35 684 2005 1 95.41 0.29 0.35 644 2005 2 95.40 0.29 0.34 632 2005 3 95.29 0.30 0.43 704 2005 4 95.31 0.30 0.40 650 2005 5 95.23 0.28 0.44 694 2005 6 95.14 0.28 0.37 661 2005 7 94.87 0.30 0.39 676 2005 8 94.79 0.48 0.45 644 2005 9 94.79 0.32 0.42 666 2005 10 94.93 0.40 0.38 675 2005 11 94.83 0.47 0.39 646 2005 12 94.70 0.35 0.33 292 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 92.93 1.17 1.40 464 2007 9 92.65 1.35 1.49 649 2007 10 92.66 2.42 1.11 531 2007 11 92.57 1.87 1.23 287 2007 12 92.24 0.46 0.41 224 2008 1 92.17 0.82 0.53 696 2008 2 92.05 0.74 0.52 498 2008 3 nan nan nan 0 2008 4 nan nan nan 0 2008 5 91.68 0.60 0.43 91 2008 6 91.74 1.00 0.54 662 2008 7 91.45 1.01 0.48 687 2008 8 91.35 1.00 0.52 653 2008 9 91.16 1.33 0.60 667 2008 10 91.41 1.50 0.72 602 2008 11 91.22 0.82 0.53 658 2008 12 91.07 0.65 0.46 660 2009 1 91.03 0.61 0.57 678 2009 2 90.80 0.77 0.54 614 2009 3 90.47 0.59 0.58 600 2009 4 90.24 0.52 0.46 653 2009 5 90.13 0.91 0.60 671 2009 6 90.10 0.97 0.52 622 2009 7 89.67 0.79 0.52 657 2009 8 89.57 0.90 0.58 617 2009 9 89.77 1.32 0.85 677 2009 10 89.57 0.67 0.53 702 2009 11 89.63 0.71 0.48 677 2009 12 89.42 0.96 0.62 669 2010 1 89.35 1.03 0.71 680 2010 2 89.35 1.12 0.77 642 2010 3 89.08 0.65 0.50 689 2010 4 89.08 0.85 0.62 640 2010 5 89.00 1.01 0.53 400 2010 6 89.55 1.12 0.75 385 2010 7 89.01 1.15 0.61 639 2010 8 88.62 0.76 0.50 476 2010 9 89.16 1.05 0.72 319 2010 10 88.90 1.24 0.71 689 2010 11 88.50 1.18 0.75 674 2010 12 88.12 0.69 0.61 661 2011 1 88.05 0.61 0.43 518 2011 2 87.78 0.62 0.47 653 2011 3 87.67 0.66 0.48 676 2011 4 87.45 0.59 0.49 673 2011 5 87.47 0.61 0.53 656 2011 6 87.35 0.76 0.54 602 2011 7 87.22 0.97 0.55 702 2011 8 87.04 0.77 0.56 684 2011 9 87.07 0.76 0.55 690 2011 10 87.18 0.75 0.48 721 2011 11 86.90 0.42 0.35 695 2011 12 86.89 0.60 0.41 680 2012 1 86.85 1.12 0.54 686 2012 2 86.59 0.74 0.42 614 2012 3 86.46 0.68 0.43 545 2012 4 86.57 0.82 0.49 683 2012 5 86.40 1.00 0.47 666 2012 6 86.25 0.85 0.42 631 2012 7 85.97 0.93 0.50 691 2012 8 85.91 0.79 0.46 707 2012 9 86.06 1.11 0.63 630 2012 10 86.04 0.90 0.60 673 2012 11 86.17 0.96 0.56 665 2012 12 85.95 0.52 0.44 675 2013 1 85.80 0.47 0.39 646 2013 2 85.61 0.58 0.40 617 2013 3 85.48 0.86 0.53 702 2013 4 85.64 0.72 0.56 694 2013 5 85.95 0.55 0.51 724 2013 6 85.51 0.84 0.51 664 2013 7 85.20 0.70 0.53 650 2013 8 85.40 1.05 0.66 464 2013 9 85.39 1.29 0.76 592 2013 10 85.24 0.93 0.60 711 2013 11 85.12 0.78 0.55 660 2013 12 84.96 0.58 0.46 685 2014 1 84.77 0.56 0.42 699 2014 2 85.14 0.75 0.70 604 2014 3 85.13 0.43 0.42 688 2014 4 85.01 0.58 0.49 624 2014 5 85.00 0.42 0.39 648 2014 6 84.76 0.46 0.40 676 2014 7 84.49 0.55 0.61 547 2014 8 84.30 0.87 1.18 113 2014 9 84.44 1.25 1.85 404 2014 10 84.22 1.69 1.71 52 2014 11 nan nan nan 0 2014 12 84.24 0.71 1.05 547 2015 1 84.37 0.88 1.01 714 2015 2 84.06 0.77 1.00 650 2015 3 83.89 0.60 0.77 706 2015 4 83.88 0.57 0.79 681 2015 5 83.88 0.52 0.70 730 2015 6 83.70 0.73 0.84 607 2015 7 83.57 1.27 1.55 655 2015 8 83.18 0.38 0.56 622 2015 9 83.02 0.17 0.36 702 2015 10 82.90 0.20 0.38 737 2015 11 82.86 0.24 0.32 703 2015 12 82.69 0.33 0.33 650 2016 1 82.50 0.39 0.36 669 2016 2 82.40 0.48 0.41 645 2016 3 82.22 0.39 0.33 601 2016 4 82.30 0.49 0.46 681 2016 5 82.19 0.33 0.36 712 2016 6 82.12 0.31 0.35 693 2016 7 81.79 0.26 0.30 721 2016 8 81.64 0.22 0.30 703 2016 9 81.83 0.23 0.40 654 2016 10 81.82 0.25 0.33 693 2016 11 81.85 0.27 0.41 684 2016 12 81.45 0.23 0.36 648 2017 1 81.51 0.25 0.36 666 2017 2 81.38 0.33 0.38 613 2017 3 81.28 0.23 0.34 675 2017 4 81.31 0.36 0.56 645 2017 5 81.32 0.29 0.39 709 2017 6 81.37 0.38 0.44 676 2017 7 81.23 0.43 0.42 394 2017 8 81.18 0.34 0.40 708 2017 9 81.27 0.30 0.42 702 2017 10 81.15 0.36 0.50 677 2017 11 81.04 0.40 0.41 699 2017 12 80.86 0.44 0.41 709 2018 1 80.82 0.41 0.35 716 2018 2 80.49 0.37 0.33 656 2018 3 80.45 0.30 0.32 718 2018 4 80.34 0.23 0.33 689 2018 5 80.31 0.23 0.34 653 2018 6 80.26 0.22 0.34 677 2018 7 80.04 0.24 0.36 709 2018 8 79.87 0.26 0.39 684 2018 9 80.00 0.21 0.36 714 2018 10 80.24 0.21 0.31 659 2018 11 80.27 0.26 0.43 697 2018 12 80.04 0.29 0.37 737 2019 1 80.00 0.35 0.50 606 2019 2 79.73 0.28 0.44 596 2019 3 79.67 0.41 0.43 718 2019 4 79.48 0.38 0.36 713 2019 5 79.38 0.34 0.43 677 2019 6 78.59 0.28 0.37 720 2019 7 78.32 0.28 0.34 744 2019 8 78.17 0.30 0.36 714 2019 9 78.12 0.32 0.35 683 2019 10 78.29 0.32 0.33 738 2019 11 78.31 0.30 0.37 709 2019 12 78.08 0.35 0.31 617 2020 1 77.96 0.35 0.31 663 2020 2 77.77 0.42 0.35 685 2020 3 77.70 0.37 0.30 662 2020 4 77.70 0.31 0.29 712 2020 5 77.76 0.28 0.44 730 2020 6 77.66 0.27 0.33 714 2020 7 77.37 0.32 0.32 710 2020 8 77.29 0.36 0.33 734 2020 9 77.32 0.37 0.34 715 2020 10 77.19 0.33 0.31 739 2020 11 77.35 0.35 0.34 321 2020 12 77.14 0.42 0.30 716 2021 1 77.10 0.50 0.31 587 2021 2 77.05 0.45 0.38 657 2021 3 76.89 0.40 0.31 690 2021 4 76.99 0.43 0.35 674 2021 5 76.80 0.41 0.29 725 2021 6 76.73 0.47 0.32 708 2021 7 76.50 0.45 0.36 737 2021 8 76.52 0.45 0.38 698 2021 9 76.72 0.49 0.40 689 2021 10 76.67 0.43 0.42 718 2021 11 76.53 0.40 0.34 712 2021 12 76.52 0.38 0.34 641 2022 1 76.23 0.43 0.36 682 2022 2 76.10 0.55 0.37 658 2022 3 75.51 0.52 0.53 715 2022 4 75.48 0.33 0.38 681 2022 5 75.09 0.43 0.35 735 2022 6 75.05 0.63 0.37 688 2022 7 74.70 0.47 0.39 713 2022 8 74.46 0.42 0.35 725 2022 9 74.47 0.47 0.36 698 2022 10 74.39 0.35 0.36 665 2022 11 74.42 0.35 0.40 660 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