# file: mlo_H1211_MM.dat # date: 2023-08-29 # # Halon-1211 (H1211) 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 Halon-1211 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 2006 # 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 H1211 in ppt, uncertainty (unc), std. dev. (sd), number of samples # H1211catsMLOyr H1211catsMLOmon H1211catsMLOm H1211catsMLOunc H1211catsMLOsd H1211catsMLOn 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 4.05 0.06 0.07 578 1999 1 4.03 0.04 0.06 713 1999 2 4.06 0.04 0.06 520 1999 3 4.08 0.05 0.09 536 1999 4 4.09 0.11 0.14 707 1999 5 4.06 0.10 0.09 526 1999 6 4.06 0.11 0.10 262 1999 7 3.99 0.06 0.09 707 1999 8 3.99 0.07 0.08 635 1999 9 4.04 0.06 0.09 455 1999 10 4.06 0.06 0.09 621 1999 11 4.13 0.06 0.11 327 1999 12 4.07 0.08 0.07 168 2000 1 4.07 0.09 0.11 274 2000 2 4.05 0.08 0.09 324 2000 3 4.09 0.11 0.09 338 2000 4 4.13 0.09 0.10 331 2000 5 4.08 0.13 0.10 259 2000 6 4.14 0.15 0.13 83 2000 7 nan nan nan 0 2000 8 nan nan nan 0 2000 9 nan nan nan 0 2000 10 4.20 0.03 0.03 122 2000 11 4.19 0.04 0.06 160 2000 12 4.20 0.03 0.08 305 2001 1 4.23 0.04 0.05 211 2001 2 4.21 0.03 0.06 323 2001 3 4.23 0.03 0.05 366 2001 4 4.23 0.03 0.04 564 2001 5 4.23 0.03 0.05 738 2001 6 4.22 0.03 0.05 344 2001 7 4.21 0.03 0.04 640 2001 8 4.19 0.03 0.04 724 2001 9 4.21 0.03 0.04 704 2001 10 4.25 0.03 0.05 739 2001 11 4.27 0.03 0.07 710 2001 12 4.27 0.03 0.05 641 2002 1 4.26 0.03 0.04 672 2002 2 4.26 0.03 0.06 656 2002 3 4.27 0.03 0.05 719 2002 4 4.27 0.03 0.05 715 2002 5 4.29 0.03 0.05 697 2002 6 4.31 0.03 0.05 716 2002 7 4.28 0.03 0.04 686 2002 8 4.27 0.03 0.04 715 2002 9 4.29 0.03 0.05 680 2002 10 4.33 0.03 0.06 735 2002 11 4.36 0.03 0.09 698 2002 12 4.35 0.03 0.06 713 2003 1 4.32 0.03 0.08 682 2003 2 4.33 0.02 0.05 664 2003 3 4.33 0.03 0.09 729 2003 4 4.37 0.03 0.05 708 2003 5 4.36 0.03 0.05 731 2003 6 4.35 0.03 0.05 708 2003 7 4.32 0.03 0.05 683 2003 8 4.32 0.03 0.05 713 2003 9 4.36 0.03 0.06 652 2003 10 4.37 0.03 0.05 691 2003 11 4.37 0.03 0.08 696 2003 12 4.37 0.03 0.06 732 2004 1 4.35 0.03 0.05 740 2004 2 4.35 0.03 0.05 662 2004 3 4.36 0.03 0.05 675 2004 4 4.42 0.03 0.04 716 2004 5 4.39 0.03 0.05 708 2004 6 4.36 0.03 0.04 662 2004 7 4.37 0.03 0.04 647 2004 8 4.33 0.03 0.04 604 2004 9 4.37 0.03 0.04 659 2004 10 4.36 0.03 0.04 708 2004 11 4.41 0.03 0.06 711 2004 12 4.38 0.03 0.03 688 2005 1 4.37 0.03 0.04 656 2005 2 4.38 0.03 0.04 639 2005 3 4.39 0.03 0.06 716 2005 4 4.40 0.03 0.04 667 2005 5 4.39 0.03 0.04 705 2005 6 4.39 0.03 0.04 679 2005 7 4.36 0.03 0.04 703 2005 8 4.35 0.07 0.04 708 2005 9 4.36 0.04 0.04 698 2005 10 4.39 0.04 0.04 721 2005 11 4.41 0.07 0.05 702 2005 12 4.41 0.04 0.04 314 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 4.37 0.07 0.08 97 2007 9 4.31 0.04 0.03 63 2007 10 4.35 0.10 0.06 519 2007 11 4.35 0.11 0.06 169 2007 12 4.34 0.02 0.03 252 2008 1 4.36 0.04 0.05 716 2008 2 4.33 0.03 0.03 525 2008 3 nan nan nan 0 2008 4 nan nan nan 0 2008 5 4.33 0.03 0.02 94 2008 6 4.32 0.04 0.03 704 2008 7 4.30 0.04 0.03 725 2008 8 4.29 0.05 0.03 700 2008 9 4.28 0.06 0.03 689 2008 10 4.30 0.07 0.03 671 2008 11 4.29 0.04 0.03 680 2008 12 4.29 0.03 0.02 709 2009 1 4.29 0.03 0.02 695 2009 2 4.28 0.03 0.03 634 2009 3 4.27 0.03 0.03 724 2009 4 4.25 0.02 0.02 700 2009 5 4.25 0.04 0.02 724 2009 6 4.25 0.04 0.03 685 2009 7 4.22 0.03 0.03 707 2009 8 4.21 0.04 0.03 655 2009 9 4.21 0.06 0.04 707 2009 10 4.21 0.03 0.02 735 2009 11 4.22 0.03 0.02 701 2009 12 4.20 0.04 0.04 711 2010 1 4.19 0.04 0.05 704 2010 2 4.20 0.05 0.07 653 2010 3 4.19 0.03 0.04 728 2010 4 4.19 0.04 0.03 689 2010 5 4.17 0.04 0.03 724 2010 6 4.15 0.05 0.03 694 2010 7 4.13 0.05 0.03 720 2010 8 4.11 0.03 0.03 498 2010 9 4.12 0.05 0.03 573 2010 10 4.13 0.06 0.03 733 2010 11 4.13 0.05 0.03 705 2010 12 4.11 0.03 0.03 688 2011 1 4.11 0.03 0.03 580 2011 2 4.11 0.03 0.02 667 2011 3 4.09 0.03 0.03 729 2011 4 4.09 0.03 0.03 689 2011 5 4.09 0.03 0.02 683 2011 6 4.08 0.03 0.02 642 2011 7 4.07 0.04 0.02 726 2011 8 4.05 0.03 0.02 722 2011 9 4.06 0.03 0.03 712 2011 10 4.06 0.03 0.02 724 2011 11 4.05 0.02 0.02 703 2011 12 4.07 0.02 0.02 737 2012 1 4.06 0.03 0.03 729 2012 2 4.04 0.02 0.03 672 2012 3 4.04 0.02 0.02 576 2012 4 4.04 0.02 0.02 715 2012 5 4.01 0.03 0.02 704 2012 6 4.00 0.03 0.02 684 2012 7 3.98 0.03 0.02 722 2012 8 3.97 0.02 0.02 733 2012 9 3.98 0.03 0.02 661 2012 10 3.98 0.03 0.02 690 2012 11 3.98 0.03 0.02 695 2012 12 4.00 0.02 0.03 724 2013 1 3.99 0.02 0.02 664 2013 2 3.97 0.02 0.02 643 2013 3 3.94 0.03 0.02 734 2013 4 3.92 0.02 0.02 710 2013 5 3.92 0.02 0.02 737 2013 6 3.88 0.03 0.03 715 2013 7 3.87 0.02 0.02 681 2013 8 3.87 0.03 0.02 512 2013 9 3.87 0.04 0.03 684 2013 10 3.86 0.03 0.02 734 2013 11 3.85 0.02 0.02 679 2013 12 3.84 0.02 0.02 726 2014 1 3.83 0.02 0.03 721 2014 2 3.82 0.03 0.03 625 2014 3 3.81 0.02 0.02 703 2014 4 3.80 0.02 0.02 703 2014 5 3.78 0.02 0.02 662 2014 6 3.77 0.02 0.02 714 2014 7 3.75 0.04 0.03 577 2014 8 3.75 0.04 0.05 607 2014 9 3.78 0.04 0.05 716 2014 10 3.77 0.04 0.05 372 2014 11 nan nan nan 0 2014 12 3.76 0.03 0.04 576 2015 1 3.75 0.04 0.04 730 2015 2 3.73 0.04 0.04 650 2015 3 3.72 0.03 0.03 719 2015 4 3.72 0.03 0.03 695 2015 5 3.72 0.02 0.03 735 2015 6 3.69 0.04 0.04 654 2015 7 3.68 0.09 0.07 637 2015 8 3.66 0.02 0.03 618 2015 9 3.64 0.01 0.02 695 2015 10 3.63 0.02 0.02 728 2015 11 3.64 0.02 0.02 709 2015 12 3.63 0.02 0.02 682 2016 1 3.60 0.02 0.02 721 2016 2 3.60 0.03 0.02 672 2016 3 3.58 0.02 0.02 612 2016 4 3.59 0.03 0.03 704 2016 5 3.57 0.02 0.02 726 2016 6 3.56 0.02 0.02 714 2016 7 3.53 0.02 0.01 739 2016 8 3.52 0.01 0.01 715 2016 9 3.51 0.01 0.01 678 2016 10 3.51 0.01 0.01 715 2016 11 3.51 0.01 0.02 708 2016 12 3.49 0.01 0.02 679 2017 1 3.49 0.01 0.02 683 2017 2 3.47 0.02 0.02 520 2017 3 3.47 0.02 0.02 632 2017 4 3.47 0.02 0.02 645 2017 5 3.46 0.01 0.01 734 2017 6 3.44 0.02 0.02 701 2017 7 3.43 0.02 0.02 477 2017 8 3.42 0.01 0.02 731 2017 9 3.42 0.01 0.02 714 2017 10 3.41 0.01 0.02 728 2017 11 3.41 0.01 0.02 714 2017 12 3.40 0.01 0.02 729 2018 1 3.40 0.01 0.01 734 2018 2 3.38 0.01 0.01 667 2018 3 3.37 0.01 0.02 727 2018 4 3.37 0.01 0.01 714 2018 5 3.36 0.01 0.02 669 2018 6 3.35 0.01 0.01 706 2018 7 3.34 0.01 0.02 735 2018 8 3.32 0.02 0.02 720 2018 9 3.32 0.01 0.01 718 2018 10 3.33 0.01 0.01 667 2018 11 3.33 0.01 0.01 603 2018 12 3.32 0.01 0.02 732 2019 1 3.32 0.01 0.03 614 2019 2 3.30 0.01 0.02 600 2019 3 3.29 0.02 0.02 737 2019 4 3.29 0.02 0.01 717 2019 5 3.28 0.02 0.02 676 2019 6 3.24 0.02 0.02 716 2019 7 3.22 0.01 0.02 744 2019 8 3.21 0.01 0.02 715 2019 9 3.20 0.01 0.02 683 2019 10 3.20 0.01 0.01 734 2019 11 3.21 0.01 0.02 715 2019 12 3.20 0.01 0.02 611 2020 1 3.19 0.01 0.02 665 2020 2 3.18 0.01 0.02 678 2020 3 3.17 0.01 0.02 669 2020 4 3.16 0.02 0.02 714 2020 5 3.16 0.01 0.02 728 2020 6 3.15 0.01 0.02 715 2020 7 3.13 0.01 0.02 709 2020 8 3.12 0.01 0.01 731 2020 9 3.12 0.01 0.01 715 2020 10 3.11 0.01 0.01 741 2020 11 3.11 0.01 0.02 369 2020 12 3.10 0.01 0.01 734 2021 1 3.10 0.01 0.01 612 2021 2 3.10 0.01 0.02 649 2021 3 3.09 0.01 0.01 697 2021 4 3.08 0.01 0.02 688 2021 5 3.07 0.01 0.02 731 2021 6 3.06 0.01 0.01 708 2021 7 3.05 0.01 0.01 667 2021 8 3.05 0.01 0.01 673 2021 9 3.05 0.02 0.02 701 2021 10 3.04 0.02 0.02 730 2021 11 3.03 0.01 0.02 714 2021 12 3.03 0.01 0.02 675 2022 1 3.02 0.01 0.01 687 2022 2 3.01 0.01 0.01 664 2022 3 2.98 0.01 0.02 735 2022 4 2.97 0.01 0.01 680 2022 5 2.96 0.01 0.01 740 2022 6 2.95 0.02 0.02 711 2022 7 2.94 0.01 0.01 725 2022 8 2.93 0.01 0.01 738 2022 9 2.94 0.01 0.01 717 2022 10 2.92 0.01 0.02 436 2022 11 2.92 0.01 0.01 665 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