# file: smo_MC_MM.dat # date: 2023-08-29 # # Methyl chlorform (MC) data from hourly in situ samples analyzed on a gas chromatograph located # at Cape Matatulu (SMO), American Samoa (14.3 S, 170.6 W, elevation: 77 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 # MCcatsSMOyr MCcatsSMOmon MCcatsSMOm MCcatsSMOunc MCcatsSMOsd MCcatsSMOn 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 58.50 0.25 0.40 536 1999 1 57.93 0.17 0.33 682 1999 2 57.16 0.12 0.42 648 1999 3 55.76 0.13 0.33 680 1999 4 55.14 0.17 0.27 595 1999 5 54.68 0.15 0.27 562 1999 6 54.20 0.14 0.26 690 1999 7 53.83 0.20 0.69 682 1999 8 51.98 0.23 0.34 566 1999 9 51.47 0.22 0.45 674 1999 10 50.42 0.21 0.54 662 1999 11 49.26 0.18 0.33 665 1999 12 48.42 0.18 0.30 721 2000 1 47.75 0.21 0.34 729 2000 2 47.13 0.17 0.28 674 2000 3 46.78 0.26 0.35 719 2000 4 46.04 0.32 0.35 707 2000 5 45.53 0.26 0.31 585 2000 6 45.00 0.28 0.28 420 2000 7 44.50 0.31 0.31 703 2000 8 43.90 0.39 0.37 619 2000 9 43.13 0.33 0.50 704 2000 10 42.12 0.36 0.55 717 2000 11 41.42 0.14 0.33 624 2000 12 40.78 0.11 0.22 715 2001 1 40.04 0.13 0.18 520 2001 2 39.55 0.17 0.24 519 2001 3 38.88 0.15 0.36 694 2001 4 38.44 0.13 0.24 450 2001 5 38.03 0.13 0.22 613 2001 6 37.65 0.13 0.23 666 2001 7 37.21 0.10 0.33 586 2001 8 37.11 0.10 0.49 705 2001 9 36.42 0.10 0.63 700 2001 10 35.98 0.09 0.45 698 2001 11 34.95 0.09 0.71 700 2001 12 34.09 0.10 0.36 703 2002 1 33.46 0.12 0.27 682 2002 2 nan nan nan 0 2002 3 32.64 0.10 0.20 700 2002 4 32.16 0.09 0.20 711 2002 5 31.85 0.11 0.18 397 2002 6 31.54 0.15 0.21 646 2002 7 31.18 0.14 0.27 691 2002 8 30.88 0.12 0.40 697 2002 9 30.38 0.11 0.24 653 2002 10 29.95 0.13 0.41 533 2002 11 28.92 0.13 0.30 397 2002 12 28.58 0.10 0.22 661 2003 1 28.05 0.10 0.42 551 2003 2 27.81 0.09 0.27 615 2003 3 27.47 0.10 0.35 567 2003 4 26.82 0.11 0.21 661 2003 5 27.49 0.10 0.37 617 2003 6 nan nan nan 0 2003 7 26.37 0.10 0.25 593 2003 8 26.25 0.12 0.27 706 2003 9 25.58 0.13 0.32 662 2003 10 25.17 0.11 0.34 663 2003 11 24.65 0.10 0.22 568 2003 12 24.25 0.10 0.42 417 2004 1 23.75 0.10 0.37 365 2004 2 23.37 0.11 0.21 651 2004 3 23.06 0.13 0.24 607 2004 4 22.76 0.12 0.24 668 2004 5 22.61 0.09 0.18 700 2004 6 22.20 0.11 0.20 666 2004 7 22.18 0.10 0.20 704 2004 8 21.52 0.13 0.27 673 2004 9 21.34 0.14 0.33 670 2004 10 21.04 0.17 0.28 699 2004 11 20.53 0.15 0.31 659 2004 12 20.28 0.13 0.29 699 2005 1 19.90 0.11 0.17 658 2005 2 19.59 0.10 0.21 558 2005 3 19.33 0.12 0.22 707 2005 4 19.09 0.14 0.18 686 2005 5 18.93 0.11 0.16 714 2005 6 18.74 0.07 0.14 372 2005 7 18.79 0.12 0.15 60 2005 8 18.01 0.11 0.17 136 2005 9 17.80 0.12 0.16 673 2005 10 17.56 0.13 0.23 725 2005 11 17.10 0.13 0.22 574 2005 12 16.85 0.12 0.24 703 2006 1 16.60 0.11 0.19 621 2006 2 16.46 0.11 0.25 610 2006 3 16.00 0.10 0.15 663 2006 4 15.81 0.09 0.18 454 2006 5 15.53 0.10 0.15 579 2006 6 15.46 0.10 0.16 676 2006 7 15.28 0.10 0.17 604 2006 8 15.23 0.10 0.19 701 2006 9 15.05 0.10 0.19 665 2006 10 14.77 0.12 0.21 617 2006 11 14.45 0.11 0.24 547 2006 12 14.20 0.11 0.19 704 2007 1 13.94 0.11 0.15 632 2007 2 13.80 0.11 0.17 583 2007 3 13.58 0.10 0.16 710 2007 4 13.38 0.11 0.19 695 2007 5 13.25 0.12 0.17 579 2007 6 13.11 0.12 0.19 661 2007 7 12.96 0.12 0.24 736 2007 8 12.88 0.11 0.19 702 2007 9 12.75 0.11 0.24 689 2007 10 12.26 0.11 0.20 652 2007 11 11.99 0.10 0.18 664 2007 12 11.84 0.10 0.17 699 2008 1 11.81 0.10 0.22 697 2008 2 11.45 0.10 0.19 646 2008 3 11.31 0.11 0.18 704 2008 4 11.12 0.11 0.17 693 2008 5 11.08 0.10 0.22 690 2008 6 11.04 0.10 0.18 673 2008 7 10.97 0.09 0.17 717 2008 8 10.75 0.10 0.16 696 2008 9 10.51 0.09 0.19 684 2008 10 10.38 0.10 0.16 679 2008 11 10.21 0.09 0.21 648 2008 12 10.10 0.11 0.18 702 2009 1 9.83 0.11 0.17 643 2009 2 9.79 0.11 0.22 629 2009 3 9.31 0.13 0.17 635 2009 4 9.26 0.13 0.18 614 2009 5 9.09 0.12 0.15 653 2009 6 9.00 0.14 0.19 522 2009 7 8.84 0.15 0.19 474 2009 8 9.27 0.17 0.25 328 2009 9 9.00 0.16 0.25 282 2009 10 9.49 0.19 0.29 230 2009 11 9.41 0.17 0.40 333 2009 12 9.03 0.16 0.50 339 2010 1 8.73 0.17 0.27 310 2010 2 8.54 0.16 0.30 266 2010 3 8.47 0.17 0.44 324 2010 4 8.71 0.18 0.29 93 2010 5 nan nan nan 0 2010 6 7.85 0.12 0.25 52 2010 7 7.93 0.14 0.34 257 2010 8 8.09 0.14 0.30 286 2010 9 8.15 0.15 0.26 333 2010 10 8.18 0.19 0.34 299 2010 11 8.20 0.18 0.34 260 2010 12 7.88 0.20 0.26 89 2011 1 7.86 0.22 0.43 301 2011 2 7.44 0.20 0.35 306 2011 3 7.18 0.23 0.36 330 2011 4 7.26 0.16 0.29 330 2011 5 7.29 0.23 0.47 339 2011 6 6.55 0.30 0.42 351 2011 7 6.73 0.40 0.58 370 2011 8 6.49 0.49 0.70 691 2011 9 6.26 0.44 0.70 700 2011 10 6.24 0.41 0.66 659 2011 11 6.20 0.41 0.66 715 2011 12 5.88 0.53 0.75 727 2012 1 5.98 0.55 0.90 725 2012 2 5.66 0.65 0.91 669 2012 3 5.71 0.65 0.87 345 2012 4 5.68 0.44 0.64 178 2012 5 5.91 0.40 0.62 34 2012 6 5.68 0.36 0.62 487 2012 7 5.63 0.33 0.55 452 2012 8 5.42 0.30 0.43 643 2012 9 5.43 0.61 0.53 412 2012 10 5.58 0.51 0.45 352 2012 11 5.40 0.19 0.32 651 2012 12 5.32 0.13 0.25 528 2013 1 5.27 0.16 0.25 731 2013 2 5.11 0.15 0.25 609 2013 3 5.11 0.32 0.25 40 2013 4 nan nan nan 0 2013 5 5.01 0.49 0.80 500 2013 6 4.91 0.47 0.83 608 2013 7 4.69 0.33 0.57 564 2013 8 4.60 0.33 0.53 566 2013 9 4.48 0.29 0.49 671 2013 10 4.41 0.28 0.46 708 2013 11 4.27 0.26 0.42 682 2013 12 4.14 0.27 0.43 701 2014 1 4.16 0.33 0.49 675 2014 2 4.11 0.27 0.50 623 2014 3 4.02 0.35 0.60 490 2014 4 3.87 0.37 0.53 670 2014 5 3.83 0.25 0.40 671 2014 6 3.91 0.28 0.49 601 2014 7 3.80 0.32 0.54 621 2014 8 3.78 0.33 0.53 612 2014 9 3.64 0.31 0.54 548 2014 10 3.51 0.21 0.33 681 2014 11 3.48 0.20 0.33 666 2014 12 3.51 0.19 0.32 630 2015 1 3.41 0.19 0.31 630 2015 2 3.36 0.14 0.24 583 2015 3 3.35 0.15 0.22 703 2015 4 3.48 0.14 0.24 674 2015 5 3.54 0.14 0.24 583 2015 6 3.07 0.14 0.26 144 2015 7 3.15 0.15 0.28 450 2015 8 3.22 0.15 0.25 355 2015 9 3.17 0.14 0.23 449 2015 10 3.09 0.14 0.27 654 2015 11 2.97 0.14 0.26 680 2015 12 3.02 0.13 0.23 617 2016 1 3.03 0.13 0.21 714 2016 2 3.00 0.12 0.22 685 2016 3 2.97 0.13 0.20 487 2016 4 2.90 0.11 0.20 641 2016 5 2.89 0.11 0.17 628 2016 6 2.86 0.10 0.16 671 2016 7 2.82 0.11 0.16 284 2016 8 nan nan nan 0 2016 9 2.59 0.10 0.14 305 2016 10 2.56 0.10 0.14 271 2016 11 2.53 0.14 0.20 307 2016 12 2.52 0.13 0.20 350 2017 1 2.51 0.12 0.21 324 2017 2 2.60 0.13 0.21 307 2017 3 2.48 0.11 0.20 536 2017 4 2.44 0.12 0.22 623 2017 5 2.45 0.12 0.21 717 2017 6 2.50 0.11 0.19 36 2017 7 nan nan nan 0 2017 8 2.44 0.09 0.16 613 2017 9 2.41 0.08 0.14 700 2017 10 2.39 0.08 0.14 721 2017 11 2.36 0.08 0.14 386 2017 12 nan nan nan 0 2018 1 nan nan nan 0 2018 2 2.32 0.09 0.16 88 2018 3 2.31 0.11 0.20 384 2018 4 2.29 0.12 0.22 684 2018 5 2.28 0.11 0.20 729 2018 6 2.29 0.11 0.19 679 2018 7 2.31 0.12 0.26 655 2018 8 2.11 0.08 0.14 577 2018 9 2.05 0.09 0.16 626 2018 10 1.86 0.11 0.21 427 2018 11 1.85 0.12 0.20 678 2018 12 1.82 0.14 0.22 629 2019 1 1.89 0.10 0.19 476 2019 2 1.78 0.08 0.16 467 2019 3 1.79 0.12 0.20 621 2019 4 1.84 0.08 0.19 454 2019 5 1.77 0.08 0.16 538 2019 6 1.78 0.09 0.14 657 2019 7 1.77 0.08 0.14 634 2019 8 1.73 0.10 0.16 528 2019 9 1.80 0.08 0.18 349 2019 10 1.77 0.09 0.20 727 2019 11 1.77 0.09 0.20 613 2019 12 1.65 0.07 0.16 502 2020 1 1.61 0.07 0.13 607 2020 2 1.57 0.07 0.14 454 2020 3 1.57 0.08 0.15 730 2020 4 1.56 0.08 0.13 486 2020 5 1.53 0.07 0.12 706 2020 6 1.55 0.06 0.11 672 2020 7 1.56 0.06 0.11 328 2020 8 nan nan nan 0 2020 9 nan nan nan 0 2020 10 1.38 0.37 0.26 118 2020 11 1.49 0.19 0.28 37 2020 12 nan nan nan 0 2021 1 nan nan nan 0 2021 2 nan nan nan 0 2021 3 nan nan nan 0 2021 4 nan nan nan 0 2021 5 nan nan nan 0 2021 6 nan nan nan 0 2021 7 nan nan nan 0 2021 8 nan nan nan 0 2021 9 nan nan nan 0 2021 10 nan nan nan 0 2021 11 nan nan nan 0 2021 12 nan nan nan 0 2022 1 nan nan nan 0 2022 2 nan nan nan 0 2022 3 nan nan nan 0 2022 4 nan nan nan 0 2022 5 nan nan nan 0 2022 6 nan nan nan 0 2022 7 nan nan nan 0 2022 8 nan nan nan 0 2022 9 1.07 0.09 0.11 269 2022 10 1.04 0.08 0.12 733 2022 11 1.01 0.19 0.13 117 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