# file: nwr_CCl4_MM.dat # # Carbon Tetrachloride (CCl4) 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: # 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 # CCl4ritsNWRyr CCl4ritsNWRmon CCl4ritsNWRm CCl4ritsNWRsd CCl4ritsNWRn 1990 2 108.728 1.732 246 1990 3 109.379 1.547 107 1990 4 108.873 1.216 278 1990 5 108.303 1.280 324 1990 6 108.112 1.107 398 1990 7 107.225 1.425 502 1990 8 108.173 1.106 330 1990 9 107.666 1.191 380 1990 10 109.317 1.015 508 1990 11 108.571 0.971 377 1990 12 108.670 1.326 679 1991 1 108.220 1.147 377 1991 2 108.411 1.455 451 1991 3 108.609 1.264 598 1991 4 108.558 0.966 640 1991 5 109.602 1.008 430 1991 6 108.507 1.346 276 1991 7 108.307 1.134 84 1991 8 nan nan 0 1991 9 108.174 1.285 283 1991 10 108.154 1.243 359 1991 11 108.610 0.759 299 1991 12 108.444 0.736 261 1992 1 107.807 0.463 283 1992 2 108.024 0.554 310 1992 3 107.957 0.431 350 1992 4 108.068 0.495 332 1992 5 108.153 0.420 336 1992 6 108.015 0.411 579 1992 7 107.972 0.559 381 1992 8 107.841 0.337 719 1992 9 107.977 0.444 636 1992 10 108.039 0.374 572 1992 11 108.322 0.534 603 1992 12 108.061 0.562 622 1993 1 107.782 0.396 615 1993 2 107.687 0.446 653 1993 3 107.663 0.600 709 1993 4 107.517 0.502 161 1993 5 107.005 0.738 324 1993 6 106.964 0.610 562 1993 7 106.652 0.615 635 1993 8 106.567 0.503 599 1993 9 106.438 1.382 636 1993 10 106.413 2.009 331 1993 11 106.400 1.796 391 1993 12 106.470 0.709 523 1994 1 106.216 0.618 560 1994 2 105.852 0.546 539 1994 3 105.911 0.505 582 1994 4 105.756 0.517 589 1994 5 105.767 0.468 322 1994 6 105.580 0.486 551 1994 7 106.039 0.745 455 1994 8 105.934 0.675 425 1994 9 105.532 0.532 497 1994 10 105.633 0.498 430 1994 11 105.609 0.903 578 1994 12 105.791 0.806 500 1995 1 105.415 0.594 684 1995 2 105.270 0.683 527 1995 3 104.996 0.838 548 1995 4 nan nan 0 1995 5 nan nan 0 1995 6 104.830 0.432 577 1995 7 104.837 0.526 638 1995 8 104.550 0.458 640 1995 9 104.703 0.379 628 1995 10 104.822 0.395 552 1995 11 104.709 0.473 666 1995 12 104.455 0.523 649 1996 1 104.249 0.485 680 1996 2 104.174 0.514 481 1996 3 104.096 0.535 537 1996 4 103.803 0.572 475 1996 5 103.851 0.402 570 1996 6 103.774 0.461 617 1996 7 103.332 0.493 498 1996 8 103.592 0.407 615 1996 9 103.865 0.420 585 1996 10 103.708 0.439 547 1996 11 103.921 0.448 529 1996 12 104.104 0.426 108 1997 1 103.649 0.387 525 1997 2 103.468 0.434 558 1997 3 103.367 0.437 280 1997 4 103.532 0.203 4 1997 5 103.282 0.321 243 1997 6 103.054 0.399 486 1997 7 103.006 0.355 501 1997 8 nan nan 0 1997 9 102.955 0.394 208 1997 10 103.023 0.323 414 1997 11 102.930 0.322 386 1997 12 102.967 0.606 356 1998 1 102.718 0.655 506 1998 2 102.489 0.649 641 1998 3 102.052 0.502 545 1998 4 101.884 0.429 372 1998 5 102.110 0.260 595 1998 6 102.102 0.329 682 1998 7 102.001 0.398 361 1998 8 102.468 0.627 442 1998 9 102.472 0.336 627 1998 10 102.290 0.441 726 1998 11 102.512 0.517 601 1998 12 102.504 0.551 575 1999 1 102.175 0.457 708 1999 2 101.943 0.468 657 1999 3 101.609 0.527 558 1999 4 101.434 0.445 580 1999 5 101.204 0.574 675 1999 6 100.824 0.471 671 1999 7 100.716 0.280 590 1999 8 100.525 0.258 702 1999 9 100.535 0.346 525 1999 10 100.710 0.322 734 1999 11 100.638 0.385 592 1999 12 100.396 0.370 401 2000 1 100.181 0.433 702 2000 2 99.998 0.402 684 2000 3 99.934 0.385 699 2000 4 99.682 0.415 389 2000 5 99.507 0.519 21 2000 6 nan nan 0 2000 7 nan nan 0 2000 8 99.978 0.312 321 2000 9 100.104 0.389 702 2000 10 100.275 0.459 688 2000 11 100.195 0.372 715 2000 12 100.067 0.432 700 2001 1 99.906 0.581 689 2001 2 99.583 0.604 601 2001 3 99.574 0.466 631 2001 4 99.392 0.510 611 2001 5 99.447 0.426 648 2001 6 99.724 0.589 257 2001 7 99.089 0.316 654 2001 8 98.957 0.316 152