# file: brw_F12_MM.dat # date: 2024-02-09 # # Chlorofluorocarbon-12 (F12) data from hourly in situ samples analyzed on a gas chromatograph located # at Pt. Barrow (BRW), Alaska (71.3 N, 156.6 W, elevation: 8 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 (2024), # Global Atmospheric Chlorofluorocarbon-12 Dry Air Mole Fractions from the # NOAA GML Halocarbons in situ Network, 1998-2024, Version: 2024-02-09, # 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 # F12catsBRWyr F12catsBRWmon F12catsBRWm F12catsBRWunc F12catsBRWsd F12catsBRWn 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 6 538.59 1.67 2.40 297 1998 7 538.82 1.47 2.18 680 1998 8 538.76 1.71 2.71 645 1998 9 538.79 1.32 2.23 314 1998 10 539.63 1.71 2.60 667 1998 11 539.68 1.54 1.72 660 1998 12 541.37 1.07 2.10 691 1999 1 542.87 0.82 1.77 705 1999 2 542.23 0.83 1.56 619 1999 3 541.63 0.82 1.47 724 1999 4 541.52 0.87 1.35 646 1999 5 541.61 0.83 1.40 482 1999 6 541.37 0.75 1.26 645 1999 7 541.23 0.78 1.58 700 1999 8 541.32 0.83 1.71 703 1999 9 541.48 1.40 2.64 672 1999 10 542.11 2.60 5.49 681 1999 11 543.83 2.44 4.60 663 1999 12 544.94 1.24 2.63 690 2000 1 545.29 0.78 1.34 632 2000 2 545.39 0.74 1.24 594 2000 3 544.72 0.58 1.25 632 2000 4 544.25 0.63 1.44 563 2000 5 544.05 0.71 1.06 725 2000 6 544.50 0.84 1.33 411 2000 7 544.38 0.88 1.23 485 2000 8 544.09 0.77 1.03 667 2000 9 544.16 0.92 1.10 573 2000 10 545.42 0.88 1.22 565 2000 11 545.52 0.96 1.25 608 2000 12 546.06 1.03 1.31 699 2001 1 545.81 1.37 1.30 258 2001 2 546.07 1.77 1.28 407 2001 3 545.82 0.98 1.28 613 2001 4 545.84 0.94 1.25 585 2001 5 545.10 0.85 1.10 712 2001 6 545.10 0.90 1.20 634 2001 7 544.53 1.22 1.53 599 2001 8 543.87 1.18 1.78 559 2001 9 543.42 1.18 1.85 634 2001 10 544.12 1.44 1.74 408 2001 11 544.98 0.93 1.13 697 2001 12 545.26 1.10 1.45 429 2002 1 nan nan nan 0 2002 2 544.84 1.76 1.72 94 2002 3 545.04 1.76 1.71 634 2002 4 544.62 1.98 1.73 428 2002 5 543.57 2.16 1.67 453 2002 6 543.00 1.78 1.44 548 2002 7 542.59 1.71 1.36 566 2002 8 542.77 1.83 1.51 478 2002 9 542.78 1.90 1.50 477 2002 10 543.31 1.51 1.36 541 2002 11 544.28 1.52 1.39 572 2002 12 544.62 1.61 1.70 398 2003 1 544.99 1.28 1.39 316 2003 2 545.68 1.26 1.37 453 2003 3 545.26 1.33 1.57 657 2003 4 544.07 1.63 1.70 613 2003 5 543.02 1.34 1.49 402 2003 6 542.24 1.49 1.23 458 2003 7 542.43 1.49 1.32 597 2003 8 541.47 1.77 1.37 563 2003 9 541.46 1.80 1.42 494 2003 10 541.46 1.62 1.28 600 2003 11 542.63 1.36 1.17 594 2003 12 543.08 1.12 1.14 675 2004 1 541.83 1.15 1.09 643 2004 2 542.75 1.04 1.09 495 2004 3 543.41 1.12 1.66 385 2004 4 nan nan nan 0 2004 5 545.19 1.44 1.97 25 2004 6 543.53 2.77 1.69 85 2004 7 543.06 2.10 1.60 597 2004 8 542.70 1.89 1.32 505 2004 9 542.74 1.31 1.16 613 2004 10 543.58 1.24 1.32 394 2004 11 543.67 1.04 1.13 469 2004 12 543.11 1.19 1.13 449 2005 1 543.06 1.30 1.48 575 2005 2 542.17 1.07 1.31 629 2005 3 542.89 1.12 1.18 698 2005 4 543.58 1.28 1.20 573 2005 5 543.34 1.46 1.17 365 2005 6 542.98 1.17 1.22 649 2005 7 542.92 1.76 1.54 575 2005 8 542.48 1.66 1.49 334 2005 9 542.12 1.51 1.29 318 2005 10 542.25 1.30 1.34 660 2005 11 542.62 1.04 1.18 643 2005 12 542.56 1.06 1.28 683 2006 1 541.92 1.09 1.49 689 2006 2 542.06 1.26 1.65 574 2006 3 541.40 1.16 1.80 677 2006 4 542.10 1.51 1.85 290 2006 5 541.80 1.27 1.66 489 2006 6 541.54 1.26 1.77 602 2006 7 540.17 1.17 1.60 238 2006 8 539.45 0.71 1.37 284 2006 9 539.22 0.73 1.67 317 2006 10 539.82 0.80 1.48 287 2006 11 540.38 0.94 1.54 503 2006 12 540.03 1.00 1.67 674 2007 1 538.66 1.00 1.46 716 2007 2 539.17 0.95 1.59 634 2007 3 538.68 0.95 1.62 656 2007 4 539.76 1.28 1.79 433 2007 5 nan nan nan 0 2007 6 538.27 0.93 1.78 560 2007 7 538.20 0.85 1.76 671 2007 8 537.89 1.37 2.41 653 2007 9 537.67 1.40 2.50 629 2007 10 537.85 1.32 2.57 655 2007 11 538.29 1.17 2.27 539 2007 12 537.97 0.94 1.58 628 2008 1 537.07 1.05 1.85 693 2008 2 536.37 1.03 1.75 640 2008 3 537.15 1.00 2.06 456 2008 4 538.04 1.08 1.91 645 2008 5 537.30 1.01 2.03 636 2008 6 536.88 1.03 1.87 656 2008 7 536.37 1.13 1.80 690 2008 8 536.26 1.29 2.16 661 2008 9 534.98 1.24 1.67 609 2008 10 535.24 1.09 1.40 602 2008 11 535.73 0.98 0.99 658 2008 12 535.96 0.96 1.30 686 2009 1 535.36 1.05 1.23 596 2009 2 535.16 0.99 1.05 619 2009 3 535.42 0.91 1.26 638 2009 4 535.61 0.85 1.36 403 2009 5 533.93 0.78 1.04 616 2009 6 532.99 0.67 0.99 608 2009 7 532.83 0.83 1.12 684 2009 8 532.55 0.99 1.27 627 2009 9 532.09 0.86 1.24 504 2009 10 532.42 0.70 1.15 726 2009 11 533.38 0.94 1.22 687 2009 12 533.68 1.04 1.19 610 2010 1 532.52 1.98 2.86 658 2010 2 531.79 2.75 3.27 483 2010 3 531.73 1.99 2.59 432 2010 4 531.90 1.99 2.62 372 2010 5 531.37 1.82 2.60 308 2010 6 531.15 1.86 2.74 384 2010 7 530.64 2.60 3.51 538 2010 8 530.18 2.46 3.68 493 2010 9 529.70 2.57 3.54 658 2010 10 529.66 1.85 2.52 584 2010 11 529.85 1.83 2.62 708 2010 12 529.94 1.78 2.46 691 2011 1 529.61 2.10 3.02 693 2011 2 529.56 2.77 3.49 670 2011 3 529.74 2.52 3.65 674 2011 4 529.42 2.39 3.38 286 2011 5 528.80 2.25 3.16 390 2011 6 528.20 1.34 1.96 702 2011 7 527.73 1.67 1.95 673 2011 8 527.23 1.88 2.48 675 2011 9 527.08 1.64 2.44 710 2011 10 527.07 1.69 2.06 727 2011 11 526.84 3.70 2.32 380 2011 12 526.86 1.92 2.33 711 2012 1 526.89 2.43 2.86 732 2012 2 526.73 2.48 3.12 686 2012 3 527.14 2.67 3.62 715 2012 4 526.52 2.27 3.01 688 2012 5 526.02 1.85 2.31 623 2012 6 526.00 1.55 2.24 614 2012 7 524.74 1.29 1.49 118 2012 8 524.41 2.71 3.81 95 2012 9 524.05 4.34 4.10 545 2012 10 524.75 2.84 2.72 568 2012 11 525.57 2.66 2.97 444 2012 12 nan nan nan 0 2013 1 nan nan nan 0 2013 2 nan nan nan 0 2013 3 nan nan nan 0 2013 4 523.56 2.70 2.34 296 2013 5 523.55 1.22 1.77 654 2013 6 522.73 1.89 3.06 650 2013 7 522.10 1.31 2.12 725 2013 8 521.09 1.52 1.87 700 2013 9 520.19 1.42 1.91 674 2013 10 520.41 2.42 3.41 723 2013 11 520.65 2.54 3.29 711 2013 12 521.01 2.17 2.99 736 2014 1 521.85 2.08 3.14 485 2014 2 521.14 1.56 3.01 593 2014 3 521.11 1.61 3.09 633 2014 4 521.07 1.88 3.51 717 2014 5 521.18 2.07 3.76 702 2014 6 520.53 2.21 4.68 602 2014 7 520.13 1.88 3.79 677 2014 8 519.81 2.51 4.50 740 2014 9 519.74 2.95 5.51 712 2014 10 519.07 3.30 5.98 688 2014 11 518.63 4.32 7.17 708 2014 12 519.02 4.78 7.63 735 2015 1 519.21 3.81 6.43 736 2015 2 518.71 3.09 5.31 650 2015 3 518.76 2.53 4.69 701 2015 4 518.18 2.04 4.00 697 2015 5 518.32 2.12 4.36 732 2015 6 518.37 1.90 4.13 691 2015 7 516.37 2.02 3.80 728 2015 8 516.46 2.29 3.98 735 2015 9 515.94 2.24 4.15 716 2015 10 515.46 2.16 4.06 724 2015 11 515.09 2.55 4.13 627 2015 12 514.60 2.49 4.73 735 2016 1 515.04 0.83 1.01 690 2016 2 515.08 1.00 0.99 676 2016 3 514.90 0.79 0.94 674 2016 4 514.40 0.75 0.94 677 2016 5 513.49 0.59 0.93 717 2016 6 512.85 0.78 1.17 694 2016 7 512.67 0.92 1.20 675 2016 8 511.81 0.70 1.10 667 2016 9 511.50 0.69 0.99 681 2016 10 511.77 0.81 1.04 693 2016 11 512.22 0.82 0.93 651 2016 12 512.13 0.98 0.98 697 2017 1 511.65 1.03 1.08 665 2017 2 511.31 1.25 1.07 387 2017 3 510.23 1.18 1.64 697 2017 4 509.55 1.22 1.60 695 2017 5 509.12 0.80 1.34 736 2017 6 509.07 0.88 1.43 614 2017 7 508.98 1.13 1.73 684 2017 8 508.45 0.77 1.35 699 2017 9 508.28 0.76 1.45 688 2017 10 508.23 0.83 1.60 729 2017 11 508.24 0.85 1.58 710 2017 12 507.65 1.20 1.82 737 2018 1 506.78 1.36 1.85 738 2018 2 506.67 1.59 2.12 659 2018 3 506.77 1.20 1.73 725 2018 4 506.66 1.16 1.75 711 2018 5 506.09 1.26 1.89 736 2018 6 505.47 1.21 1.81 664 2018 7 504.64 1.15 1.66 741 2018 8 503.77 1.20 1.71 711 2018 9 503.52 1.35 2.07 711 2018 10 503.33 1.55 2.14 687 2018 11 503.69 1.60 2.38 715 2018 12 503.34 1.63 2.21 687 2019 1 503.15 1.64 2.33 729 2019 2 503.27 1.87 2.29 663 2019 3 502.71 1.55 2.15 732 2019 4 502.52 1.56 2.29 705 2019 5 502.15 1.50 2.06 723 2019 6 501.35 1.80 2.15 703 2019 7 500.80 2.48 2.61 696 2019 8 499.36 1.62 2.23 698 2019 9 498.97 1.47 2.39 601 2019 10 498.98 1.68 2.30 742 2019 11 498.79 1.82 2.50 709 2019 12 498.85 1.66 2.29 712 2020 1 498.44 1.82 2.41 735 2020 2 499.10 1.69 2.83 694 2020 3 498.67 1.80 2.66 738 2020 4 498.58 1.74 2.41 720 2020 5 498.15 1.60 2.38 736 2020 6 497.92 1.53 2.21 715 2020 7 497.47 1.56 2.12 703 2020 8 497.11 1.63 2.45 714 2020 9 496.24 1.60 2.37 703 2020 10 496.03 1.87 2.31 597 2020 11 495.56 2.21 2.58 568 2020 12 495.17 1.94 2.59 682 2021 1 494.56 2.69 2.49 663 2021 2 494.45 1.90 2.43 605 2021 3 493.75 1.70 2.54 730 2021 4 493.76 1.73 2.40 700 2021 5 494.28 2.02 2.48 570 2021 6 493.27 0.83 1.24 648 2021 7 492.70 0.70 0.86 617 2021 8 492.25 0.69 0.97 703 2021 9 491.96 0.43 0.61 693 2021 10 492.09 0.35 0.51 683 2021 11 492.08 0.33 0.53 663 2021 12 491.96 0.63 0.83 676 2022 1 491.53 0.96 1.09 635 2022 2 491.12 1.04 1.42 634 2022 3 491.12 1.25 1.70 655 2022 4 491.29 0.79 1.26 667 2022 5 490.92 0.69 1.13 690 2022 6 490.29 1.24 1.87 697 2022 7 488.83 1.13 1.83 673 2022 8 488.78 1.34 2.01 413 2022 9 488.44 1.52 2.41 712 2022 10 488.45 1.34 2.08 684 2022 11 488.27 1.28 2.08 672 2022 12 488.15 0.67 1.16 711 2023 1 488.00 0.91 1.47 704 2023 2 487.68 1.11 1.58 635 2023 3 487.43 0.93 1.35 694 2023 4 487.72 0.53 1.03 679 2023 5 486.93 0.71 1.46 716 2023 6 486.67 1.05 1.89 235 2023 7 483.76 1.55 2.45 496 2023 8 483.50 1.74 2.50 709 2023 9 483.18 1.27 2.05 670 2023 10 483.15 1.27 1.95 716 2023 11 483.38 1.38 2.31 706 2023 12 482.78 1.13 1.84 696 2024 1 482.21 1.46 2.04 657 2024 2 481.82 1.48 2.04 134