# file: mlo_CCl4_MM.dat # # Carbon Tetrachloride (CCl4) 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: # Carbon Tetrachloride data from the NOAA/ESRL halocarbons in situ program. # # Calibration scale used: NOAA 2008 # # 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 # CCl4ritsMLOyr CCl4ritsMLOmon CCl4ritsMLOm CCl4ritsMLOsd CCl4ritsMLOn 1987 6 106.903 1.135 59 1987 7 nan nan 0 1987 8 nan nan 0 1987 9 108.020 1.313 122 1987 10 108.377 1.493 91 1987 11 109.689 1.210 92 1987 12 108.075 1.225 120 1988 1 108.869 1.081 49 1988 2 109.157 0.955 119 1988 3 108.823 1.339 127 1988 4 108.783 0.853 102 1988 5 107.957 0.875 193 1988 6 108.587 0.618 167 1988 7 108.623 0.659 166 1988 8 108.162 0.778 190 1988 9 108.587 0.962 85 1988 10 108.051 1.041 175 1988 11 108.112 1.057 110 1988 12 108.850 0.973 178 1989 1 108.137 1.036 29 1989 2 nan nan 0 1989 3 nan nan 0 1989 4 nan nan 0 1989 5 nan nan 0 1989 6 nan nan 0 1989 7 nan nan 0 1989 8 nan nan 0 1989 9 nan nan 0 1989 10 nan nan 0 1989 11 nan nan 0 1989 12 nan nan 0 1990 1 nan nan 0 1990 2 nan nan 0 1990 3 108.162 0.697 226 1990 4 107.525 0.535 311 1990 5 108.111 0.542 706 1990 6 108.224 0.715 548 1990 7 107.808 0.548 578 1990 8 107.698 0.583 648 1990 9 107.954 0.523 695 1990 10 108.149 0.515 321 1990 11 107.794 0.744 239 1990 12 107.934 0.617 656 1991 1 107.570 0.492 583 1991 2 107.245 0.469 555 1991 3 107.628 0.545 519 1991 4 108.150 0.662 638 1991 5 108.357 0.663 528 1991 6 107.922 0.452 662 1991 7 107.721 0.518 573 1991 8 107.394 0.556 30 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 2 107.189 0.637 75 1992 3 107.082 0.721 534 1992 4 106.695 0.647 560 1992 5 106.853 0.593 597 1992 6 107.182 0.572 597 1992 7 106.852 0.543 676 1992 8 106.600 0.541 655 1992 9 106.651 0.604 635 1992 10 106.394 0.548 593 1992 11 106.315 0.522 644 1992 12 106.367 0.468 668 1993 1 106.336 0.548 609 1993 2 106.212 0.481 635 1993 3 106.221 0.563 645 1993 4 106.129 0.525 586 1993 5 106.048 0.526 579 1993 6 106.585 0.826 204 1993 7 106.237 0.484 593 1993 8 105.942 0.469 445 1993 9 106.269 0.709 379 1993 10 106.355 0.527 485 1993 11 106.468 0.494 583 1993 12 106.367 0.557 642 1994 1 106.148 0.545 656 1994 2 105.831 0.509 595 1994 3 105.815 0.526 667 1994 4 105.865 0.484 638 1994 5 105.922 0.500 630 1994 6 105.874 0.550 702 1994 7 105.520 0.511 516 1994 8 105.478 0.554 464 1994 9 105.394 0.576 593 1994 10 105.498 0.631 588 1994 11 105.444 0.521 602 1994 12 105.266 0.556 616 1995 1 105.032 0.610 621 1995 2 104.972 0.549 434 1995 3 104.932 0.882 650 1995 4 104.971 0.591 593 1995 5 104.950 0.615 255 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 nan nan 0 1995 9 nan nan 0 1995 10 104.771 0.338 67 1995 11 104.736 0.435 604 1995 12 104.492 0.337 645 1996 1 104.253 0.372 633 1996 2 104.335 0.413 548 1996 3 104.254 0.365 712 1996 4 104.158 0.425 499 1996 5 104.250 0.405 530 1996 6 104.313 0.336 649 1996 7 104.284 0.367 540 1996 8 104.035 0.335 513 1996 9 104.328 0.463 537 1996 10 104.317 0.421 705 1996 11 104.035 0.356 631 1996 12 104.038 0.373 725 1997 1 103.750 0.345 679 1997 2 103.571 0.418 489 1997 3 103.465 0.321 322 1997 4 103.628 0.375 649 1997 5 103.362 0.392 696 1997 6 103.537 0.364 582 1997 7 103.205 0.393 704 1997 8 103.219 0.329 359 1997 9 103.284 0.642 355 1997 10 103.155 0.456 719 1997 11 103.130 0.377 672 1997 12 103.108 0.476 663 1998 1 102.708 0.541 544 1998 2 102.848 0.504 499 1998 3 103.213 0.533 558 1998 4 103.116 0.448 343 1998 5 103.096 0.482 735 1998 6 103.046 0.383 654 1998 7 102.743 0.394 737 1998 8 102.494 0.371 738 1998 9 102.637 0.405 665 1998 10 102.703 0.437 571 1998 11 102.508 0.383 219 1998 12 102.391 0.376 498 1999 1 102.224 0.384 667 1999 2 102.135 0.359 671 1999 3 101.958 0.389 637 1999 4 101.846 0.376 662 1999 5 101.931 0.485 663 1999 6 101.773 0.469 426 1999 7 nan nan 0 1999 8 nan nan 0 1999 9 101.241 0.396 193 1999 10 101.290 0.467 675 1999 11 101.197 0.470 620 1999 12 101.055 0.369 393 2000 1 101.046 0.410 582 2000 2 101.075 0.490 691 2000 3 100.949 0.461 693 2000 4 100.894 0.472 715 2000 5 100.936 0.467 669 2000 6 100.962 0.528 617 2000 7 100.668 0.471 596 2000 8 100.758 0.427 270 2000 9 100.479 0.553 453 2000 10 100.392 0.533 722 2000 11 99.809 0.441 336 2000 12 99.658 0.490 405