# file: nwr_F12_MM.dat # # Chlorofluorocarbon-12 (F12) 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: # 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 # F12ritsNWRyr F12ritsNWRmon F12ritsNWRm F12ritsNWRsd F12ritsNWRn 1990 2 480.084 6.829 244 1990 3 484.834 14.844 107 1990 4 480.597 7.807 275 1990 5 483.637 7.859 301 1990 6 484.407 9.593 310 1990 7 486.829 13.370 494 1990 8 485.704 10.026 316 1990 9 489.186 7.113 367 1990 10 490.912 7.050 505 1990 11 489.900 4.794 364 1990 12 493.972 19.057 595 1991 1 491.759 8.388 665 1991 2 490.184 6.546 639 1991 3 493.177 5.853 635 1991 4 494.643 7.458 633 1991 5 495.310 9.582 551 1991 6 494.784 9.669 492 1991 7 496.075 11.003 681 1991 8 495.995 8.010 492 1991 9 499.288 6.000 274 1991 10 499.212 5.158 257 1991 11 501.822 6.019 467 1991 12 499.717 5.138 205 1992 1 501.243 3.699 174 1992 2 500.723 5.493 363 1992 3 501.673 6.016 283 1992 4 502.543 3.768 473 1992 5 504.322 7.467 668 1992 6 506.950 7.655 481 1992 7 507.133 7.780 592 1992 8 508.754 5.887 731 1992 9 510.279 5.231 129 1992 10 507.567 3.628 119 1992 11 506.624 4.478 581 1992 12 507.370 3.655 628 1993 1 507.504 3.730 619 1993 2 508.161 4.097 662 1993 3 507.438 4.234 709 1993 4 509.749 3.749 534 1993 5 510.363 4.170 708 1993 6 511.829 7.321 424 1993 7 512.900 7.192 635 1993 8 514.838 4.938 599 1993 9 515.221 5.509 639 1993 10 515.899 5.946 308 1993 11 517.128 4.303 230 1993 12 516.662 5.476 512 1994 1 516.039 6.679 599 1994 2 517.130 6.197 189 1994 3 516.188 3.301 485 1994 4 517.714 3.973 603 1994 5 517.950 5.733 351 1994 6 519.053 5.748 546 1994 7 523.223 6.639 637 1994 8 523.043 4.574 524 1994 9 521.325 4.243 584 1994 10 523.602 5.695 485 1994 11 522.031 3.473 577 1994 12 521.584 2.432 511 1995 1 521.870 4.327 680 1995 2 520.846 3.567 531 1995 3 521.439 3.208 543 1995 4 523.337 2.421 46 1995 5 525.020 4.402 354 1995 6 525.100 4.555 625 1995 7 525.717 4.649 631 1995 8 528.577 5.667 633 1995 9 528.746 4.148 609 1995 10 527.946 2.101 546 1995 11 527.470 2.266 655 1995 12 527.860 2.275 633 1996 1 527.942 2.122 676 1996 2 527.344 3.542 500 1996 3 527.956 3.115 536 1996 4 527.540 1.740 694 1996 5 528.871 4.082 570 1996 6 529.241 4.728 604 1996 7 530.252 5.963 499 1996 8 531.531 3.690 701 1996 9 531.401 3.007 595 1996 10 531.195 3.795 546 1996 11 530.672 2.997 530 1996 12 530.644 1.435 109 1997 1 530.594 4.944 509 1997 2 530.605 2.542 554 1997 3 529.652 1.591 281 1997 4 nan nan 0 1997 5 529.524 4.650 109 1997 6 532.372 5.132 655 1997 7 533.186 4.237 500 1997 8 nan nan 0 1997 9 534.017 3.623 214 1997 10 533.595 4.233 211 1997 11 nan nan 0 1997 12 nan nan 0 1998 1 nan nan 0 1998 2 nan nan 0 1998 3 nan nan 0 1998 4 nan nan 0 1998 5 534.876 4.980 351 1998 6 535.169 4.533 614 1998 7 536.785 4.410 584 1998 8 535.648 4.071 517 1998 9 536.878 4.092 644 1998 10 536.803 3.606 727 1998 11 536.072 4.857 376 1998 12 535.976 5.496 628 1999 1 535.611 2.256 710 1999 2 535.289 1.885 659 1999 3 535.799 4.161 571 1999 4 535.944 2.931 582 1999 5 536.106 3.787 518 1999 6 535.988 4.439 623 1999 7 537.063 3.875 594 1999 8 537.132 3.891 703 1999 9 537.314 4.196 527 1999 10 536.815 2.154 659 1999 11 536.479 1.950 594 1999 12 536.795 1.786 403 2000 1 536.671 1.824 704 2000 2 537.020 1.959 684 2000 3 537.347 2.373 700 2000 4 537.242 2.770 689 2000 5 538.730 3.772 203 2000 6 nan nan 0 2000 7 539.916 2.915 329 2000 8 540.690 3.150 647 2000 9 539.049 3.245 692 2000 10 539.892 3.459 689 2000 11 539.378 2.409 713 2000 12 539.371 1.850 700 2001 1 539.603 2.789 685 2001 2 538.617 2.143 598 2001 3 538.413 2.613 628 2001 4 537.514 3.507 592 2001 5 535.811 6.341 608 2001 6 537.296 6.182 261 2001 7 538.642 3.746 374 2001 8 538.570 3.023 155