# file: mlo_MC_MM.dat # # Methyl Chloroform (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/ESRL Radiatively Important Trace # Species (RITS) program. The RITS program started in 1983 and continued # until 2000. A detailed history of the RITS program can be found at # http://www.esrl.noaa.gov/gmd/hats/insitu/insitu.html # # PIs: Dr. James W. Elkins, Dr. Bradley D. Hall, J. David Nance # # National Oceanic and Atmospheric Administration (NOAA) # Earth System Research Laboratory (ESRL) # 325 Broadway, R/GMD1 # Boulder, CO 80305-3328 # # 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. Please contact the PIs for more information. # # The data should be cited in presentations or publications as the flowing: # Methyl Chloroform data from the NOAA/ESRL halocarbons in situ program. # # Calibration scale used: NOAA 2003 # # More information about the calibration scale can be found at: # http://www.esrl.noaa.gov/gmd/ccl/ # # The RITS GCs sampled once per hour from the early 1990s onward. # Monthly-averaged data are provided in parts-per-trillion (ppt). # # Abbreviations: # yr year # mon month # min minute # m daily/monthly median concentration (or hourly value) # sd standard deviation # n number of samples # brw Barrow, Alaska # nwr Niwot Ridge, Colorado # mlo Mauna Loa, Hawaii # smo Cape Matatula, American Samoa # spo South Pole, Antarctica # nan not-a-number (missing data) # # year, mon, concentration in ppt, std. dev, number of samples # MCritsMLOyr MCritsMLOmon MCritsMLOm MCritsMLOsd MCritsMLOn 1990 2 135.373 5.037 125 1990 3 130.637 6.918 224 1990 4 129.040 4.232 321 1990 5 134.997 5.894 702 1990 6 132.331 6.118 539 1990 7 132.837 3.922 574 1990 8 130.246 3.853 649 1990 9 134.312 4.794 693 1990 10 140.111 4.868 561 1990 11 136.097 6.223 504 1990 12 137.194 4.800 647 1991 1 131.915 4.713 587 1991 2 131.687 3.863 556 1991 3 137.294 5.772 533 1991 4 137.779 7.151 635 1991 5 138.941 4.702 537 1991 6 138.503 5.024 659 1991 7 137.750 4.395 573 1991 8 131.200 3.741 350 1991 9 nan nan 0 1991 10 nan nan 0 1991 11 nan nan 0 1991 12 nan nan 0 1992 1 nan nan 0 1992 2 135.657 4.491 75 1992 3 136.446 5.481 533 1992 4 135.809 4.327 559 1992 5 134.059 4.393 596 1992 6 134.262 4.215 599 1992 7 135.251 4.689 666 1992 8 132.599 3.888 656 1992 9 133.685 4.678 639 1992 10 130.772 3.872 595 1992 11 131.688 4.643 651 1992 12 133.758 4.082 668 1993 1 133.137 4.866 610 1993 2 131.107 3.588 635 1993 3 132.322 3.920 645 1993 4 129.580 3.229 579 1993 5 130.591 4.985 575 1993 6 129.205 2.691 205 1993 7 127.835 3.028 595 1993 8 124.745 2.049 456 1993 9 124.537 2.763 393 1993 10 125.050 3.177 486 1993 11 126.483 2.655 583 1993 12 124.553 2.079 640 1994 1 123.374 2.973 649 1994 2 121.462 2.551 594 1994 3 122.053 3.551 664 1994 4 120.892 2.338 636 1994 5 119.549 2.336 625 1994 6 116.783 2.539 667 1994 7 113.720 1.799 517 1994 8 113.242 1.378 467 1994 9 112.249 1.851 596 1994 10 112.754 1.443 588 1994 11 113.194 1.675 600 1994 12 111.345 2.355 614 1995 1 108.868 2.326 621 1995 2 107.844 3.019 434 1995 3 107.447 2.698 651 1995 4 107.685 2.099 593 1995 5 105.403 2.400 214 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 nan nan 0 1995 9 nan nan 0 1995 10 101.563 1.274 65 1995 11 99.366 1.396 602 1995 12 98.117 1.051 643 1996 1 96.528 1.419 633 1996 2 96.977 1.628 549 1996 3 95.856 1.503 712 1996 4 93.227 1.177 500 1996 5 91.637 1.289 531 1996 6 90.952 1.211 649 1996 7 89.314 1.052 547 1996 8 87.420 0.962 517 1996 9 86.780 0.875 547 1996 10 85.907 0.750 671 1996 11 85.371 1.008 632 1996 12 84.913 1.341 725 1997 1 82.828 1.057 679 1997 2 82.600 1.214 490 1997 3 81.366 0.831 322 1997 4 80.293 1.017 648 1997 5 79.152 1.302 692 1997 6 77.604 0.899 601 1997 7 75.482 0.859 723 1997 8 74.510 0.542 358 1997 9 73.294 0.654 385 1997 10 72.542 0.620 696 1997 11 72.105 0.619 671 1997 12 71.208 0.841 657 1998 1 69.690 1.163 542 1998 2 69.051 0.944 499 1998 3 68.669 0.795 557 1998 4 67.460 0.859 343 1998 5 66.669 0.829 734 1998 6 65.472 0.829 651 1998 7 63.611 0.800 737 1998 8 62.401 0.505 735 1998 9 61.623 0.499 665 1998 10 60.975 0.533 570 1998 11 60.364 0.431 219 1998 12 59.909 0.492 496 1999 1 59.408 0.541 665 1999 2 58.823 0.718 670 1999 3 57.620 0.706 636 1999 4 57.368 0.803 663 1999 5 55.842 0.659 666 1999 6 54.508 0.667 640 1999 7 53.051 0.678 737 1999 8 52.166 0.578 667 1999 9 51.574 0.486 588 1999 10 51.022 0.488 675 1999 11 50.627 0.461 620 1999 12 50.253 0.435 393 2000 1 49.976 0.505 581 2000 2 48.915 0.565 688 2000 3 48.468 0.495 693 2000 4 47.852 0.665 714 2000 5 46.506 0.488 668 2000 6 45.805 0.502 615 2000 7 44.919 0.539 594 2000 8 44.297 0.451 270 2000 9 43.571 0.471 548 2000 10 43.156 0.501 728 2000 11 42.620 0.495 468 2000 12 42.362 0.485 403