# file: mlo_F12_MM.dat # # Chlorofluorocarbon-12 (F12) 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: # Chlorofluorocarbon-12 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 # F12ritsMLOyr F12ritsMLOmon F12ritsMLOm F12ritsMLOsd F12ritsMLOn 1987 6 422.079 3.947 56 1987 7 425.531 3.318 49 1987 8 426.164 3.042 65 1987 9 430.125 3.776 120 1987 10 430.797 3.333 159 1987 11 435.196 3.766 93 1987 12 432.841 2.162 117 1988 1 432.259 2.960 51 1988 2 435.681 2.636 118 1988 3 435.793 3.056 130 1988 4 437.937 3.920 103 1988 5 438.170 3.684 193 1988 6 438.826 3.015 164 1988 7 442.021 2.696 169 1988 8 442.947 3.845 200 1988 9 447.704 3.814 186 1988 10 449.968 3.906 201 1988 11 452.613 2.659 139 1988 12 453.010 5.006 171 1989 1 455.252 3.034 32 1989 2 455.680 2.684 80 1989 3 459.286 4.097 169 1989 4 461.617 3.619 182 1989 5 463.201 2.750 262 1989 6 462.154 2.599 322 1989 7 464.750 2.615 299 1989 8 468.685 3.098 319 1989 9 472.821 3.110 331 1989 10 473.687 2.150 336 1989 11 473.983 2.952 348 1989 12 475.177 2.943 315 1990 1 475.573 3.873 134 1990 2 474.919 3.586 135 1990 3 473.399 3.396 226 1990 4 473.355 1.973 321 1990 5 477.192 2.533 704 1990 6 477.159 3.149 541 1990 7 478.681 2.058 577 1990 8 479.422 2.350 648 1990 9 481.828 2.273 667 1990 10 484.913 2.090 376 1990 11 483.445 2.619 510 1990 12 484.622 2.484 657 1991 1 482.609 2.554 584 1991 2 482.759 2.041 550 1991 3 485.536 2.308 502 1991 4 487.053 2.065 632 1991 5 488.376 1.977 533 1991 6 489.443 1.994 659 1991 7 489.985 2.161 566 1991 8 489.216 1.962 622 1991 9 485.515 2.508 18 1991 10 nan nan 0 1991 11 nan nan 0 1991 12 nan nan 0 1992 1 nan nan 0 1992 2 494.756 1.979 73 1992 3 495.328 1.917 531 1992 4 495.510 1.536 559 1992 5 496.480 1.654 639 1992 6 497.200 1.861 599 1992 7 498.196 1.929 678 1992 8 499.170 1.858 657 1992 9 500.372 2.174 638 1992 10 500.085 1.744 595 1992 11 500.774 1.882 642 1992 12 501.811 1.561 667 1993 1 501.959 1.676 587 1993 2 501.296 1.530 622 1993 3 502.729 1.550 645 1993 4 502.626 1.795 586 1993 5 504.417 2.019 704 1993 6 504.387 2.446 697 1993 7 504.852 1.943 591 1993 8 505.371 1.759 455 1993 9 505.642 2.632 490 1993 10 507.684 2.202 467 1993 11 509.664 1.401 577 1993 12 509.415 1.286 634 1994 1 509.223 1.565 657 1994 2 509.827 1.621 595 1994 3 510.768 1.884 669 1994 4 510.592 1.677 639 1994 5 511.773 2.072 632 1994 6 512.101 1.923 708 1994 7 512.780 1.526 524 1994 8 514.392 1.563 467 1994 9 514.983 1.435 596 1994 10 515.671 1.602 588 1994 11 516.892 1.419 603 1994 12 516.043 1.517 616 1995 1 515.263 1.537 622 1995 2 515.873 1.584 435 1995 3 516.029 1.640 651 1995 4 516.817 1.466 590 1995 5 516.377 1.985 257 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 nan nan 0 1995 9 nan nan 0 1995 10 522.690 1.678 68 1995 11 521.451 1.675 602 1995 12 521.145 1.157 644 1996 1 520.703 1.296 633 1996 2 521.495 1.331 545 1996 3 521.621 1.191 712 1996 4 521.356 1.181 501 1996 5 522.304 1.241 530 1996 6 523.041 1.385 649 1996 7 523.777 1.284 544 1996 8 524.461 1.063 518 1996 9 525.429 1.245 548 1996 10 525.954 1.178 707 1996 11 525.605 1.118 632 1996 12 525.843 1.236 727 1997 1 525.459 1.010 679 1997 2 525.558 1.203 490 1997 3 525.492 0.878 323 1997 4 526.176 0.902 649 1997 5 526.165 1.097 696 1997 6 526.946 1.043 602 1997 7 526.811 1.286 720 1997 8 527.132 0.998 359 1997 9 528.854 1.443 364 1997 10 528.168 1.316 720 1997 11 529.046 1.091 672 1997 12 529.157 1.194 663 1998 1 528.245 1.365 544 1998 2 529.147 1.377 499 1998 3 530.151 1.200 557 1998 4 530.485 1.116 338 1998 5 530.808 1.146 737 1998 6 530.966 1.021 655 1998 7 530.966 1.089 738 1998 8 531.091 1.047 738 1998 9 532.154 0.960 666 1998 10 532.066 1.031 547 1998 11 531.850 0.989 217 1998 12 532.472 0.834 485 1999 1 532.172 0.784 738 1999 2 532.261 0.932 672 1999 3 531.876 1.068 399 1999 4 532.209 0.952 664 1999 5 532.062 0.970 664 1999 6 532.320 0.920 640 1999 7 532.107 0.917 731 1999 8 532.657 1.005 665 1999 9 533.827 0.970 590 1999 10 534.202 0.933 676 1999 11 534.572 0.985 618 1999 12 534.515 0.940 395 2000 1 534.493 0.914 586 2000 2 534.178 0.894 689 2000 3 534.400 0.845 694 2000 4 534.439 0.845 237