# file: nwr_MC_MM.dat # # Methyl Chloroform (MC) data from hourly in situ samples analyzed on # a gas chromatograph located at Niwot Ridge (NWR), Colorado # (C-1 site: 40.04 N, 105.54 W, elevation: 3018 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 # MCritsNWRyr MCritsNWRmon MCritsNWRm MCritsNWRsd MCritsNWRn 1990 2 150.754 12.667 128 1990 3 158.918 29.439 103 1990 4 143.531 12.425 268 1990 5 146.120 20.432 322 1990 6 142.858 18.875 393 1990 7 142.957 21.747 500 1990 8 138.671 25.820 329 1990 9 141.459 24.732 380 1990 10 142.585 9.672 506 1990 11 138.450 8.943 377 1990 12 146.596 12.787 681 1991 1 142.379 5.918 675 1991 2 136.032 7.565 588 1991 3 147.312 11.011 622 1991 4 149.659 15.190 627 1991 5 149.246 19.156 544 1991 6 145.078 17.895 484 1991 7 138.577 13.140 680 1991 8 137.291 11.932 491 1991 9 143.592 13.338 229 1991 10 147.836 18.768 285 1991 11 143.498 11.128 494 1991 12 142.041 8.126 541 1992 1 144.808 4.963 390 1992 2 144.902 7.100 568 1992 3 146.399 7.072 608 1992 4 144.488 7.378 608 1992 5 145.588 12.834 625 1992 6 148.560 8.273 560 1992 7 144.173 10.670 357 1992 8 143.118 8.646 654 1992 9 143.257 13.643 599 1992 10 145.836 13.512 552 1992 11 145.759 8.074 585 1992 12 143.584 5.667 600 1993 1 142.733 6.261 591 1993 2 144.920 6.042 613 1993 3 141.368 9.505 677 1993 4 145.673 8.609 185 1993 5 139.482 5.775 583 1993 6 140.636 9.249 572 1993 7 138.614 10.457 611 1993 8 133.023 8.438 593 1993 9 132.292 9.333 635 1993 10 129.519 4.994 320 1993 11 131.087 9.133 362 1993 12 130.794 3.878 523 1994 1 128.336 4.407 597 1994 2 127.816 4.493 560 1994 3 127.568 5.386 590 1994 4 128.759 6.136 597 1994 5 124.312 6.191 322 1994 6 120.057 7.917 559 1994 7 122.121 5.600 441 1994 8 118.576 4.412 417 1994 9 115.693 3.451 495 1994 10 118.893 9.404 468 1994 11 117.461 5.213 579 1994 12 115.019 3.995 510 1995 1 114.767 3.486 673 1995 2 111.971 4.875 531 1995 3 113.518 3.845 530 1995 4 111.387 nan 1 1995 5 114.050 5.437 670 1995 6 110.066 4.152 687 1995 7 105.743 3.161 631 1995 8 104.618 2.871 622 1995 9 103.605 3.315 612 1995 10 103.003 2.007 552 1995 11 101.162 2.271 659 1995 12 101.293 2.048 617 1996 1 100.515 2.493 671 1996 2 98.814 2.546 487 1996 3 98.268 2.525 525 1996 4 96.609 2.332 688 1996 5 94.982 3.012 570 1996 6 91.803 2.727 604 1996 7 89.826 2.725 444 1996 8 88.523 1.702 679 1996 9 87.674 1.610 564 1996 10 85.986 1.558 529 1996 11 85.560 3.268 413 1996 12 nan nan 0 1997 1 82.784 1.862 518 1997 2 81.886 1.444 547 1997 3 81.074 1.611 281 1997 4 81.541 1.230 4 1997 5 78.334 1.777 328 1997 6 75.186 1.935 615 1997 7 73.754 1.840 488 1997 8 nan nan 0 1997 9 70.710 1.444 213 1997 10 70.192 1.451 417 1997 11 70.692 1.087 382 1997 12 68.916 2.895 353 1998 1 68.835 2.854 505 1998 2 68.635 2.852 641 1998 3 67.316 1.667 548 1998 4 66.415 1.283 475 1998 5 64.255 1.349 732 1998 6 63.508 1.227 682 1998 7 61.761 0.908 628 1998 8 61.118 1.255 508 1998 9 59.744 1.104 647 1998 10 59.606 0.928 722 1998 11 58.892 1.175 597 1998 12 58.116 1.169 613 1999 1 57.956 1.092 707 1999 2 57.190 1.261 656 1999 3 56.331 1.322 559 1999 4 56.034 1.155 586 1999 5 54.343 1.049 681 1999 6 52.766 0.964 693 1999 7 51.096 0.772 593 1999 8 49.919 0.675 700 1999 9 49.769 0.944 533 1999 10 48.923 0.625 725 1999 11 48.393 0.766 595 1999 12 48.050 0.550 404 2000 1 47.611 0.649 699 2000 2 47.330 0.642 681 2000 3 47.134 0.630 700 2000 4 46.303 0.936 598 2000 5 46.373 1.211 476 2000 6 nan nan 0 2000 7 44.045 0.469 173 2000 8 43.483 0.746 637 2000 9 42.455 0.783 681 2000 10 42.337 0.721 681 2000 11 42.284 0.625 712 2000 12 41.757 0.561 701 2001 1 41.327 0.452 689 2001 2 40.712 0.491 601 2001 3 40.322 0.603 631 2001 4 39.542 0.758 612 2001 5 38.506 0.870 640 2001 6 37.872 0.962 247 2001 7 35.985 0.370 657 2001 8 35.355 0.319 151