# file: nwr_F11_MM.dat # # Chlorofluorocarbon-11 (F11) 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-11 data from the NOAA/ESRL halocarbons in situ program. # # Calibration scale used: NOAA 2016 # # 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 # F11ritsNWRyr F11ritsNWRmon F11ritsNWRm F11ritsNWRsd F11ritsNWRn 1990 2 261.880 3.265 247 1990 3 265.588 7.047 79 1990 4 261.697 2.569 212 1990 5 262.378 4.306 254 1990 6 261.514 4.950 328 1990 7 260.919 5.266 423 1990 8 261.710 11.180 304 1990 9 262.135 5.795 378 1990 10 264.733 3.170 366 1990 11 265.150 3.382 304 1990 12 266.198 4.601 315 1991 1 265.093 3.393 503 1991 2 264.937 1.673 312 1991 3 265.898 1.998 438 1991 4 266.141 3.500 639 1991 5 265.639 3.979 551 1991 6 264.356 3.912 492 1991 7 264.388 2.631 355 1991 8 264.293 3.279 403 1991 9 265.043 2.522 124 1991 10 266.733 2.520 251 1991 11 267.605 2.776 479 1991 12 267.206 3.621 205 1992 1 266.674 3.106 475 1992 2 267.001 2.587 357 1992 3 267.430 3.344 292 1992 4 267.551 2.266 472 1992 5 268.270 2.862 666 1992 6 269.035 4.702 476 1992 7 268.406 3.748 295 1992 8 269.127 3.513 713 1992 9 269.859 8.269 313 1992 10 270.873 8.960 475 1992 11 270.071 4.415 189 1992 12 269.679 2.231 359 1993 1 269.103 1.569 399 1993 2 269.623 1.799 578 1993 3 269.486 2.320 710 1993 4 270.069 2.415 523 1993 5 269.581 2.256 710 1993 6 269.666 3.022 478 1993 7 269.630 2.748 628 1993 8 269.611 1.946 602 1993 9 269.925 3.327 391 1993 10 269.610 2.132 157 1993 11 270.899 2.711 226 1993 12 270.099 4.341 523 1994 1 270.108 5.065 583 1994 2 270.048 6.535 240 1994 3 269.497 1.920 476 1994 4 269.566 1.915 605 1994 5 269.142 1.951 334 1994 6 269.240 2.538 552 1994 7 269.447 2.546 457 1994 8 270.808 2.127 426 1994 9 269.443 1.341 526 1994 10 270.000 1.837 454 1994 11 270.150 1.613 520 1994 12 269.863 1.845 503 1995 1 269.566 1.903 685 1995 2 268.825 1.484 534 1995 3 268.893 1.873 549 1995 4 269.202 1.392 46 1995 5 269.300 1.705 353 1995 6 268.347 1.887 636 1995 7 268.485 1.576 643 1995 8 268.472 1.928 633 1995 9 268.665 1.512 628 1995 10 268.514 1.388 558 1995 11 268.369 1.619 665 1995 12 268.247 1.522 647 1996 1 267.855 1.511 682 1996 2 267.749 1.611 595 1996 3 267.713 1.697 672 1996 4 267.153 1.358 693 1996 5 267.512 1.616 577 1996 6 267.337 1.801 615 1996 7 266.853 2.728 498 1996 8 267.080 1.656 711 1996 9 267.376 1.450 599 1996 10 267.201 2.009 548 1996 11 267.327 1.484 528 1996 12 267.585 1.622 111 1997 1 266.899 1.712 522 1997 2 266.928 1.585 556 1997 3 266.298 1.636 280 1997 4 265.523 1.066 3 1997 5 266.480 1.734 359 1997 6 266.178 2.494 651 1997 7 266.209 1.499 503 1997 8 nan nan 0 1997 9 265.988 1.114 211 1997 10 266.270 1.624 339 1997 11 nan nan 0 1997 12 266.151 2.161 360 1998 1 266.225 1.489 499 1998 2 265.919 1.772 639 1998 3 265.796 1.528 471 1998 4 265.132 1.336 465 1998 5 264.726 1.747 737 1998 6 264.644 1.762 658 1998 7 264.860 1.674 659 1998 8 264.528 2.181 514 1998 9 265.454 1.898 647 1998 10 265.105 1.569 728 1998 11 265.025 1.577 603 1998 12 264.807 1.482 730 1999 1 264.683 1.930 708 1999 2 264.326 1.607 658 1999 3 264.517 2.784 572 1999 4 264.136 1.536 582 1999 5 263.604 1.671 684 1999 6 262.659 2.207 714 1999 7 263.250 2.227 597 1999 8 262.723 2.036 695 1999 9 262.909 2.171 533 1999 10 263.010 1.465 660 1999 11 262.895 1.258 596 1999 12 262.799 1.644 402 2000 1 262.398 1.437 700 2000 2 262.130 1.525 682 2000 3 261.809 1.591 697 2000 4 261.956 1.623 536 2000 5 260.524 1.367 19 2000 6 nan nan 0 2000 7 nan nan 0 2000 8 262.469 1.755 326 2000 9 262.642 2.146 687 2000 10 262.924 1.910 687 2000 11 262.579 1.523 712 2000 12 262.043 1.405 700 2001 1 261.937 1.580 688 2001 2 261.741 1.408 596 2001 3 261.808 1.924 616 2001 4 261.092 2.195 579 2001 5 260.033 2.448 73 2001 6 260.263 1.009 47 2001 7 260.572 1.624 370 2001 8 260.467 1.587 155