# file: mlo_CH3Cl_MM.dat # date: Wed, Sep 26, 2018 3:03:21 PM # # (CH3Cl) 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/ESRL 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. # # (PIs) Geoffrey S. Dutton, Dr. James W. Elkins, Dr. Bradley D. Hall # # National Oceanic and Atmospheric Administration (NOAA) # Earth System Research Laboratory (ESRL) # 325 Broadway, R/GMD1 # Boulder, CO 80305-3328 # # Email: Geoff.Dutton@noaa.gov; James.W.Elkins@noaa.gov; Bradley.Hall@noaa.gov # Phone: (303) 497-6086 (303) 497-6224 (303) 497-7011 # Fax: (303) 497-6290 # # See (http://www.esrl.noaa.gov/gmd/obop/) for station statistics and personnel. # # Data use policy: # If you use this data in a publication or report, we would appreciate that you contact the principal # investigators (PIs) first and discuss your interests. We are trying to encourage scientific discussion. # The PIs can discuss the quality of the data and any potential problems with its analysis. Recent data (less # than 1.5 years) are considered preliminary. Please contact the PIs for more information. # # The data should be cited in presentations or publications as the flowing: data from # the NOAA/ESRL halocarbons in situ program. # # DOI: http://doi.org/10.7289/V5X0659V # # Calibration scale used: NOAA 2003 # # More information about the calibration scale can be found at: # http://www.esrl.noaa.gov/gmd/ccl/ # # 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. # # year, month, monthly median of CH3Cl in ppt, std. dev., number of samples # CH3ClcatsMLOyr CH3ClcatsMLOmon CH3ClcatsMLOm CH3ClcatsMLOsd CH3ClcatsMLOn 1998 1 nan nan 0 1998 2 nan nan 0 1998 3 nan nan 0 1998 4 nan nan 0 1998 5 nan nan 0 1998 6 nan nan 0 1998 7 nan nan 0 1998 8 nan nan 0 1998 9 nan nan 0 1998 10 nan nan 0 1998 11 nan nan 0 1998 12 nan nan 0 1999 1 nan nan 0 1999 2 nan nan 0 1999 3 nan nan 0 1999 4 603.34 3.00 188 1999 5 591.03 2.56 707 1999 6 585.11 3.69 637 1999 7 564.72 3.10 686 1999 8 549.47 2.52 623 1999 9 545.86 2.71 403 1999 10 556.75 2.70 607 1999 11 563.87 1.61 573 1999 12 562.85 1.64 395 2000 1 566.80 2.01 513 2000 2 572.55 2.04 603 2000 3 577.58 2.21 728 2000 4 577.26 2.15 686 2000 5 564.16 2.55 648 2000 6 563.10 2.64 546 2000 7 544.14 2.32 573 2000 8 538.95 2.40 132 2000 9 539.96 2.28 302 2000 10 545.02 3.95 618 2000 11 550.82 1.59 358 2000 12 565.80 1.98 622 2001 1 576.25 3.46 435 2001 2 574.15 2.05 644 2001 3 583.13 2.22 709 2001 4 577.14 1.72 694 2001 5 572.99 1.57 720 2001 6 555.00 1.66 186 2001 7 nan nan 0 2001 8 nan nan 0 2001 9 531.79 1.81 233 2001 10 540.05 3.05 676 2001 11 nan nan 0 2001 12 nan nan 0 2002 1 nan nan 0 2002 2 572.03 3.03 310 2002 3 577.61 1.84 710 2002 4 584.35 2.13 711 2002 5 571.49 1.44 701 2002 6 565.41 1.82 697 2002 7 548.46 1.74 670 2002 8 541.07 5.20 303 2002 9 540.40 15.10 643 2002 10 551.43 21.28 508 2002 11 581.70 28.43 612 2002 12 569.09 38.91 312 2003 1 nan nan 0 2003 2 573.97 32.25 397 2003 3 594.90 28.83 501 2003 4 587.42 23.25 459 2003 5 593.98 21.58 425 2003 6 573.07 5.64 516 2003 7 556.86 4.11 464 2003 8 544.92 3.30 631 2003 9 544.37 10.87 427 2003 10 551.34 4.83 254 2003 11 554.76 3.52 510 2003 12 568.76 2.96 707 2004 1 575.83 6.20 726 2004 2 579.33 7.09 633 2004 3 579.40 4.24 599 2004 4 588.25 3.87 676 2004 5 576.88 3.90 662 2004 6 557.07 4.27 608 2004 7 550.24 4.39 642 2004 8 537.50 4.04 598 2004 9 529.04 4.75 620 2004 10 536.24 4.97 691 2004 11 548.15 5.32 690 2004 12 556.40 5.74 668 2005 1 564.87 4.18 637 2005 2 576.72 4.25 620 2005 3 581.82 5.58 654 2005 4 588.64 5.54 556 2005 5 574.08 4.22 479 2005 6 544.68 4.44 188 2005 7 548.71 8.31 448 2005 8 507.69 14.77 116 2005 9 502.78 8.21 539 2005 10 514.85 5.50 402 2005 11 nan nan 0 2005 12 nan nan 0 2006 1 nan nan 0 2006 2 nan nan 0 2006 3 nan nan 0 2006 4 592.42 1.58 142 2006 5 569.02 1.63 684 2006 6 557.83 1.86 658 2006 7 545.57 2.29 654 2006 8 531.50 1.78 705 2006 9 526.91 3.09 504 2006 10 547.34 2.06 608 2006 11 562.08 1.56 681 2006 12 576.60 3.14 696 2007 1 578.76 2.29 689 2007 2 603.40 3.57 606 2007 3 605.31 3.37 694 2007 4 616.67 2.61 651 2007 5 603.02 4.13 307 2007 6 nan nan 0 2007 7 565.89 3.98 126 2007 8 529.96 5.02 612 2007 9 527.87 4.51 612 2007 10 546.95 13.57 56 2007 11 560.72 3.66 24 2007 12 560.15 3.16 708 2008 1 569.41 3.67 54 2008 2 nan nan 0 2008 3 nan nan 0 2008 4 nan nan 0 2008 5 nan nan 0 2008 6 587.49 2.64 153 2008 7 581.26 2.38 733 2008 8 557.69 2.31 725 2008 9 551.02 2.18 513 2008 10 553.78 3.13 448 2008 11 547.21 3.23 456 2008 12 539.28 3.21 634 2009 1 583.09 3.05 739 2009 2 591.30 3.11 668 2009 3 609.94 3.79 497 2009 4 621.49 3.09 666 2009 5 618.74 3.12 735 2009 6 588.94 2.72 685 2009 7 546.37 2.60 743 2009 8 536.18 2.16 671 2009 9 533.07 2.26 719 2009 10 536.98 2.21 741 2009 11 549.61 2.36 714 2009 12 563.16 2.49 707 2010 1 578.66 2.65 733 2010 2 588.09 3.03 650 2010 3 587.66 3.63 724 2010 4 586.44 5.18 679 2010 5 582.86 9.65 708 2010 6 558.55 4.02 714 2010 7 550.95 3.38 736 2010 8 537.00 2.90 643 2010 9 528.88 2.98 583 2010 10 542.46 2.88 739 2010 11 552.66 2.38 713 2010 12 551.88 2.36 686 2011 1 561.74 2.56 583 2011 2 567.60 2.86 671 2011 3 567.52 3.30 742 2011 4 575.22 3.43 705 2011 5 565.97 3.00 662 2011 6 604.77 4.44 598 2011 7 596.94 4.90 738 2011 8 580.71 4.42 742 2011 9 581.53 4.56 622 2011 10 592.34 4.62 719 2011 11 591.19 4.53 715 2011 12 565.37 3.69 739 2012 1 579.19 4.29 732 2012 2 582.08 8.75 634 2012 3 589.07 4.01 547 2012 4 596.10 4.07 719 2012 5 586.86 3.36 723 2012 6 572.75 3.59 689 2012 7 548.73 3.90 734 2012 8 536.12 4.23 739 2012 9 534.82 4.10 666 2012 10 541.42 4.47 698 2012 11 573.22 3.56 719 2012 12 568.95 3.10 660 2013 1 583.66 2.32 658 2013 2 579.68 3.67 631 2013 3 576.53 3.95 715 2013 4 577.77 3.63 714 2013 5 572.20 3.93 733 2013 6 557.38 4.84 718 2013 7 550.98 4.55 684 2013 8 555.52 3.73 511 2013 9 558.85 3.70 699 2013 10 564.20 4.39 692 2013 11 569.99 2.54 670 2013 12 576.39 3.41 724 2014 1 586.17 3.00 737 2014 2 531.82 2.95 647 2014 3 546.23 3.07 702 2014 4 544.83 3.40 718 2014 5 543.80 3.36 659 2014 6 559.67 3.40 714 2014 7 556.20 3.72 710 2014 8 528.97 3.17 623 2014 9 523.51 2.97 715 2014 10 528.73 3.34 632 2014 11 537.08 2.70 704 2014 12 554.97 3.54 672 2015 1 551.77 2.66 718 2015 2 546.35 2.32 646 2015 3 553.71 1.93 725 2015 4 551.04 3.74 713 2015 5 544.34 4.11 737 2015 6 508.61 3.78 691 2015 7 500.18 2.91 737 2015 8 488.26 2.67 715 2015 9 484.28 1.90 688 2015 10 497.32 2.03 722 2015 11 514.37 1.62 706 2015 12 525.18 2.19 503 2016 1 546.59 2.30 704 2016 2 552.31 2.15 616 2016 3 558.27 2.20 566 2016 4 566.81 2.41 688 2016 5 553.65 2.29 697 2016 6 528.63 2.52 712 2016 7 513.16 2.06 720 2016 8 502.72 1.86 685 2016 9 502.52 1.33 640 2016 10 508.49 1.51 704 2016 11 521.93 1.60 672 2016 12 515.22 2.33 135 2017 1 nan nan 0 2017 2 529.98 1.49 630 2017 3 534.98 1.20 610 2017 4 539.75 1.47 683 2017 5 528.61 1.86 691 2017 6 522.65 2.15 647 2017 7 504.63 1.60 514 2017 8 483.15 1.68 689 2017 9 479.09 1.37 694 2017 10 482.34 1.22 718 2017 11 485.72 1.39 691 2017 12 492.51 1.49 727 2018 1 496.53 1.18 200 2018 2 nan nan 0 2018 3 nan nan 0 2018 4 nan nan 0 2018 5 nan nan 0 2018 6 nan nan 0 2018 7 nan nan 0 2018 8 nan nan 0 2018 9 nan nan 0