# file: mlo_MC_MM.dat # date: 2023-08-29 # # Methyl chlorform (MC) 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 Methyl chlorform 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 2003 # 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 MC in ppt, uncertainty (unc), std. dev. (sd), number of samples # MCcatsMLOyr MCcatsMLOmon MCcatsMLOm MCcatsMLOunc MCcatsMLOsd MCcatsMLOn 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 56.93 0.30 0.83 189 1999 5 54.76 0.39 0.74 719 1999 6 53.81 0.47 0.90 612 1999 7 52.85 0.61 1.01 703 1999 8 51.80 0.60 1.02 637 1999 9 51.29 0.68 1.03 451 1999 10 50.68 0.67 0.97 620 1999 11 50.35 0.63 0.89 573 1999 12 49.48 0.86 0.88 397 2000 1 49.25 0.96 1.00 551 2000 2 48.24 0.94 0.99 543 2000 3 47.75 0.92 1.07 597 2000 4 47.07 0.87 0.99 651 2000 5 45.85 0.96 0.99 518 2000 6 45.43 1.10 1.04 173 2000 7 nan nan nan 0 2000 8 nan nan nan 0 2000 9 nan nan nan 0 2000 10 43.75 0.43 0.37 241 2000 11 43.71 0.21 0.49 348 2000 12 43.22 0.16 0.58 630 2001 1 42.67 0.15 0.48 395 2001 2 42.37 0.14 0.60 642 2001 3 41.86 0.15 0.55 713 2001 4 40.91 0.14 0.64 601 2001 5 39.23 0.14 0.65 680 2001 6 38.40 0.15 0.64 336 2001 7 37.34 0.17 0.36 624 2001 8 36.49 0.21 0.41 724 2001 9 36.14 0.19 0.32 699 2001 10 35.86 0.20 0.36 730 2001 11 35.47 0.21 0.41 697 2001 12 35.14 0.20 0.44 643 2002 1 34.79 0.21 0.49 671 2002 2 34.37 0.24 0.59 633 2002 3 33.92 0.21 0.52 719 2002 4 33.24 0.21 0.44 709 2002 5 32.67 0.19 0.51 700 2002 6 31.99 0.16 0.53 713 2002 7 31.24 0.18 0.39 686 2002 8 30.71 0.20 0.38 721 2002 9 30.54 0.24 0.45 699 2002 10 30.19 0.20 0.56 653 2002 11 29.77 0.18 0.37 344 2002 12 29.53 0.19 0.39 355 2003 1 29.12 0.20 0.51 515 2003 2 29.16 0.14 0.56 642 2003 3 28.29 0.16 0.46 731 2003 4 28.08 0.14 0.36 712 2003 5 27.50 0.14 0.42 738 2003 6 27.05 0.14 0.35 708 2003 7 26.41 0.14 0.45 688 2003 8 26.02 0.15 0.37 712 2003 9 25.63 0.15 0.36 674 2003 10 25.24 0.14 0.47 685 2003 11 24.87 0.14 0.33 696 2003 12 24.51 0.13 0.30 737 2004 1 24.09 0.13 0.25 740 2004 2 23.83 0.14 0.35 678 2004 3 23.76 0.13 0.40 653 2004 4 23.61 0.13 0.38 712 2004 5 22.98 0.14 0.33 709 2004 6 22.49 0.15 0.33 671 2004 7 22.10 0.14 0.32 654 2004 8 21.52 0.16 0.29 603 2004 9 21.37 0.16 0.32 659 2004 10 20.95 0.15 0.32 712 2004 11 20.86 0.15 0.31 711 2004 12 20.57 0.16 0.32 691 2005 1 20.20 0.16 0.31 651 2005 2 20.11 0.14 0.24 640 2005 3 19.89 0.14 0.38 716 2005 4 19.55 0.14 0.31 660 2005 5 19.04 0.16 0.33 707 2005 6 18.75 0.15 0.33 680 2005 7 18.25 0.16 0.34 701 2005 8 18.03 0.17 0.30 717 2005 9 18.31 0.15 0.32 686 2005 10 18.28 0.15 0.31 714 2005 11 18.16 0.14 0.32 710 2005 12 17.93 0.14 0.36 602 2006 1 17.72 0.16 0.34 646 2006 2 17.40 0.17 0.38 625 2006 3 17.15 0.16 0.35 720 2006 4 17.08 0.16 0.40 703 2006 5 16.48 0.16 0.41 702 2006 6 15.92 0.17 0.36 663 2006 7 15.53 0.18 0.34 693 2006 8 15.19 0.17 0.37 702 2006 9 15.06 0.21 0.43 526 2006 10 14.88 0.17 0.32 621 2006 11 14.65 0.17 0.29 684 2006 12 14.52 0.15 0.31 704 2007 1 14.45 0.16 0.30 703 2007 2 14.27 0.16 0.30 593 2007 3 14.00 0.18 0.37 262 2007 4 nan nan nan 0 2007 5 nan nan nan 0 2007 6 13.16 0.47 0.73 272 2007 7 12.89 0.41 0.72 419 2007 8 12.72 0.72 0.80 40 2007 9 nan nan nan 0 2007 10 12.40 0.22 0.31 516 2007 11 12.13 0.41 0.56 114 2007 12 12.06 0.24 0.37 179 2008 1 12.00 0.15 0.28 717 2008 2 12.07 0.16 0.39 540 2008 3 nan nan nan 0 2008 4 nan nan nan 0 2008 5 11.07 0.09 0.16 90 2008 6 10.96 0.12 0.21 709 2008 7 10.76 0.12 0.19 733 2008 8 10.55 0.12 0.15 729 2008 9 10.37 0.13 0.14 705 2008 10 10.25 0.16 0.14 660 2008 11 10.14 0.10 0.13 696 2008 12 10.05 0.08 0.14 720 2009 1 10.01 0.08 0.23 502 2009 2 10.00 0.09 0.14 292 2009 3 9.77 0.07 0.16 355 2009 4 9.67 0.06 0.17 688 2009 5 9.40 0.07 0.14 736 2009 6 9.23 0.09 0.16 669 2009 7 8.97 0.09 0.17 738 2009 8 8.77 0.07 0.12 669 2009 9 8.72 0.09 0.13 704 2009 10 8.60 0.06 0.13 740 2009 11 8.56 0.07 0.11 714 2009 12 8.45 0.08 0.13 740 2010 1 8.31 0.07 0.12 632 2010 2 8.24 0.09 0.14 332 2010 3 8.16 0.09 0.20 710 2010 4 8.00 0.10 0.16 680 2010 5 7.83 0.10 0.17 740 2010 6 7.67 0.10 0.16 707 2010 7 7.53 0.10 0.16 732 2010 8 7.40 0.07 0.14 511 2010 9 7.33 0.11 0.16 579 2010 10 7.21 0.12 0.16 742 2010 11 7.17 0.14 0.20 715 2010 12 7.04 0.12 0.20 693 2011 1 7.00 0.10 0.15 588 2011 2 6.86 0.10 0.17 671 2011 3 6.78 0.11 0.21 742 2011 4 6.64 0.13 0.22 702 2011 5 6.58 0.11 0.20 680 2011 6 6.63 0.11 0.18 662 2011 7 6.42 0.11 0.18 742 2011 8 6.28 0.11 0.19 742 2011 9 6.17 0.11 0.17 711 2011 10 6.14 0.09 0.14 742 2011 11 6.08 0.10 0.16 713 2011 12 6.22 0.09 0.18 741 2012 1 6.08 0.11 0.19 742 2012 2 6.02 0.09 0.20 694 2012 3 5.93 0.09 0.19 594 2012 4 5.88 0.11 0.23 718 2012 5 5.72 0.11 0.23 727 2012 6 5.57 0.11 0.22 688 2012 7 5.40 0.11 0.21 737 2012 8 5.28 0.10 0.20 738 2012 9 5.18 0.10 0.18 676 2012 10 5.10 0.08 0.16 691 2012 11 5.11 0.07 0.17 718 2012 12 5.04 0.14 0.23 727 2013 1 4.88 0.15 0.26 666 2013 2 4.93 0.12 0.22 662 2013 3 4.88 0.13 0.22 735 2013 4 4.91 0.13 0.26 484 2013 5 4.80 0.14 0.29 741 2013 6 4.61 0.17 0.31 606 2013 7 4.49 0.17 0.32 662 2013 8 4.39 0.09 0.14 517 2013 9 4.34 0.10 0.14 672 2013 10 4.31 0.09 0.11 741 2013 11 4.29 0.09 0.14 693 2013 12 4.17 0.13 0.21 663 2014 1 4.01 0.15 0.23 341 2014 2 4.22 0.18 0.20 381 2014 3 4.30 0.12 0.14 630 2014 4 4.20 0.14 0.14 162 2014 5 4.13 0.16 0.16 525 2014 6 4.07 0.14 0.14 710 2014 7 4.00 0.15 0.16 536 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 3.25 0.17 0.27 570 2015 9 3.08 0.12 0.24 714 2015 10 3.07 0.13 0.21 742 2015 11 3.05 0.13 0.24 719 2015 12 2.98 0.10 0.22 698 2016 1 2.95 0.09 0.20 739 2016 2 2.95 0.13 0.25 692 2016 3 2.90 0.09 0.18 625 2016 4 2.89 0.11 0.19 710 2016 5 2.84 0.09 0.17 739 2016 6 2.79 0.07 0.14 711 2016 7 2.72 0.07 0.13 743 2016 8 2.70 0.07 0.12 710 2016 9 2.76 0.15 0.15 574 2016 10 2.72 0.13 0.15 624 2016 11 2.69 0.08 0.15 710 2016 12 2.66 0.09 0.15 669 2017 1 2.64 0.08 0.15 684 2017 2 2.64 0.16 0.27 538 2017 3 2.57 0.14 0.24 640 2017 4 2.56 0.17 0.30 653 2017 5 2.52 0.15 0.30 743 2017 6 2.46 0.13 0.24 719 2017 7 2.39 0.13 0.29 401 2017 8 2.26 0.18 0.33 685 2017 9 2.20 0.16 0.29 683 2017 10 2.19 0.13 0.26 724 2017 11 2.18 0.08 0.16 715 2017 12 2.15 0.07 0.16 723 2018 1 2.11 0.08 0.14 742 2018 2 2.08 0.08 0.16 660 2018 3 2.10 0.09 0.17 722 2018 4 2.04 0.09 0.18 705 2018 5 2.00 0.09 0.18 655 2018 6 1.95 0.11 0.21 705 2018 7 1.95 0.14 0.24 740 2018 8 1.94 0.16 0.34 694 2018 9 1.87 0.08 0.16 710 2018 10 1.88 0.08 0.15 659 2018 11 1.85 0.08 0.16 719 2018 12 1.82 0.08 0.16 734 2019 1 1.80 0.07 0.17 574 2019 2 1.82 0.08 0.17 584 2019 3 1.77 0.09 0.16 728 2019 4 1.77 0.08 0.14 720 2019 5 1.75 0.08 0.17 683 2019 6 1.56 0.15 0.30 710 2019 7 1.55 0.15 0.30 727 2019 8 1.53 0.14 0.28 706 2019 9 1.54 0.12 0.24 680 2019 10 1.59 0.10 0.22 735 2019 11 1.66 0.09 0.21 721 2019 12 1.61 0.09 0.19 616 2020 1 1.59 0.08 0.18 643 2020 2 1.55 0.09 0.19 679 2020 3 1.50 0.11 0.23 663 2020 4 1.48 0.15 0.31 699 2020 5 1.45 0.11 0.24 722 2020 6 1.41 0.12 0.23 715 2020 7 1.39 0.10 0.18 710 2020 8 1.38 0.08 0.16 733 2020 9 1.38 0.08 0.16 711 2020 10 1.37 0.07 0.15 739 2020 11 1.39 0.07 0.13 366 2020 12 1.39 0.06 0.12 713 2021 1 1.42 0.07 0.14 602 2021 2 1.37 0.07 0.14 647 2021 3 1.36 0.06 0.12 675 2021 4 1.36 0.06 0.12 693 2021 5 1.31 0.06 0.12 716 2021 6 1.29 0.07 0.13 698 2021 7 1.32 0.11 0.21 717 2021 8 1.33 0.09 0.18 653 2021 9 1.29 0.09 0.17 656 2021 10 1.27 0.12 0.27 573 2021 11 1.27 0.09 0.17 708 2021 12 1.44 0.07 0.18 670 2022 1 1.48 0.07 0.14 676 2022 2 1.47 0.07 0.13 647 2022 3 1.28 0.06 0.15 727 2022 4 1.23 0.06 0.13 684 2022 5 1.20 0.06 0.13 735 2022 6 1.18 0.06 0.13 703 2022 7 1.17 0.06 0.13 722 2022 8 1.15 0.06 0.12 734 2022 9 1.15 0.07 0.13 708 2022 10 1.13 0.10 0.18 678 2022 11 1.11 0.09 0.18 656 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