# file: mlo_F11_MM.dat # # Chlorofluorocarbon-11 (F11) 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-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 # F11ritsMLOyr F11ritsMLOmon F11ritsMLOm F11ritsMLOsd F11ritsMLOn 1987 8 240.051 1.956 45 1987 9 242.409 3.468 118 1987 10 245.866 3.884 161 1987 11 248.228 4.143 92 1987 12 241.441 3.715 117 1988 1 245.190 3.057 46 1988 2 245.942 2.815 118 1988 3 245.175 3.198 130 1988 4 257.914 6.109 102 1988 5 256.964 4.408 194 1988 6 256.393 4.826 165 1988 7 259.602 4.791 170 1988 8 257.034 4.641 199 1988 9 259.426 4.503 190 1988 10 259.579 4.127 202 1988 11 260.532 3.997 137 1988 12 261.614 4.026 12 1989 1 258.701 11.351 144 1989 2 256.873 7.267 78 1989 3 255.572 8.286 118 1989 4 259.542 4.586 178 1989 5 259.777 3.224 259 1989 6 259.503 4.026 324 1989 7 260.327 3.772 301 1989 8 262.302 4.364 326 1989 9 264.162 4.586 330 1989 10 264.234 2.617 335 1989 11 264.087 4.183 347 1989 12 264.285 5.783 311 1990 1 263.495 5.749 126 1990 2 264.368 4.921 182 1990 3 263.492 5.842 224 1990 4 263.253 3.157 319 1990 5 264.683 2.862 704 1990 6 264.766 3.141 544 1990 7 264.963 2.267 576 1990 8 265.407 2.317 645 1990 9 265.721 2.113 660 1990 10 266.054 2.254 375 1990 11 265.142 2.334 507 1990 12 266.386 2.068 646 1991 1 265.797 2.200 585 1991 2 264.742 1.779 548 1991 3 264.899 2.139 499 1991 4 265.407 2.072 632 1991 5 265.823 1.886 530 1991 6 265.459 2.183 661 1991 7 265.307 2.181 569 1991 8 263.876 2.507 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 2 267.271 2.020 74 1992 3 267.383 2.501 526 1992 4 266.819 2.671 549 1992 5 267.431 2.693 634 1992 6 267.089 2.380 584 1992 7 266.846 1.685 668 1992 8 266.772 1.601 655 1992 9 266.992 1.658 635 1992 10 266.673 1.805 588 1992 11 266.839 1.894 638 1992 12 267.489 1.679 660 1993 1 267.305 1.806 606 1993 2 266.703 1.528 627 1993 3 266.977 1.903 630 1993 4 266.736 2.360 567 1993 5 267.139 2.301 560 1993 6 267.871 3.030 203 1993 7 267.610 2.434 593 1993 8 267.170 2.207 448 1993 9 267.134 2.232 494 1993 10 268.295 2.461 480 1993 11 269.116 2.298 579 1993 12 268.852 1.402 637 1994 1 268.396 1.516 651 1994 2 268.019 1.281 593 1994 3 268.303 1.824 668 1994 4 268.244 2.485 634 1994 5 268.415 2.506 621 1994 6 268.197 2.246 706 1994 7 267.865 1.935 520 1994 8 268.060 1.778 466 1994 9 267.775 1.845 593 1994 10 268.017 2.544 586 1994 11 268.672 2.374 595 1994 12 268.345 2.554 608 1995 1 267.930 2.273 615 1995 2 267.666 2.361 430 1995 3 267.821 2.762 643 1995 4 267.597 2.293 588 1995 5 267.341 2.514 254 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 nan nan 0 1995 9 nan nan 0 1995 10 267.785 2.095 68 1995 11 267.806 2.340 598 1995 12 267.640 2.014 642 1996 1 267.213 2.035 627 1996 2 267.353 2.022 546 1996 3 267.067 1.992 710 1996 4 266.731 2.742 512 1996 5 266.885 2.223 525 1996 6 266.764 2.083 643 1996 7 266.920 2.672 543 1996 8 266.663 2.044 518 1996 9 266.837 2.271 544 1996 10 266.988 1.987 702 1996 11 266.639 1.616 631 1996 12 266.823 2.367 722 1997 1 266.482 2.063 675 1997 2 266.292 2.405 487 1997 3 265.829 1.446 321 1997 4 266.014 2.111 647 1997 5 265.539 2.166 693 1997 6 265.455 2.131 599 1997 7 265.330 2.409 721 1997 8 265.297 1.828 358 1997 9 265.511 2.559 399 1997 10 265.223 2.046 715 1997 11 265.376 2.008 668 1997 12 265.407 2.401 656 1998 1 264.846 2.542 539 1998 2 265.206 3.048 496 1998 3 265.388 2.719 556 1998 4 265.248 2.637 342 1998 5 265.321 2.038 733 1998 6 264.962 2.042 655 1998 7 264.544 1.811 730 1998 8 264.420 1.872 733 1998 9 264.453 1.813 663 1998 10 264.548 0.993 565 1998 11 264.405 1.164 218 1998 12 264.507 1.019 495 1999 1 264.379 1.052 733 1999 2 264.144 0.944 669 1999 3 263.897 1.317 424 1999 4 263.597 1.222 660 1999 5 263.651 1.278 664 1999 6 263.185 1.308 641 1999 7 262.397 1.519 736 1999 8 262.398 1.341 666 1999 9 262.606 1.285 589 1999 10 262.966 1.322 676 1999 11 263.123 1.464 620 1999 12 262.821 1.066 394 2000 1 262.321 1.094 585 2000 2 262.230 1.088 690 2000 3 262.442 1.360 689 2000 4 262.169 1.273 236