# file: nwr_CCl4_MM.dat # date: 2023-08-29 # # 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/GML Chromatograph for Atmospheric Trace # Species (CATS) program. This GC replaces the RITS GCs operated during the # period of 1986 through 2000. This work was funded in part by the Atmospheric Chemistry Project of # NOAA's Climate and Global Change Program. # # Data use policy see https://gml.noaa.gov/hats/hats_datause.html # # Citation: # G.S. Dutton and B.D. Hall (2023), # Global Atmospheric Carbon tetrachloride Dry Air Mole Fractions from the # NOAA GML Halocarbons in situ Network, 1998-2023, Version: 2023-08-29, # https://doi.org/10.7289/V5X0659V # # For contact information see https://gml.noaa.gov/about/stafflist.html # # Calibration scale used: NOAA 2008 # More information about the calibration scale can be found at: https://gml.noaa.gov/ccl/ # # See (http://www.esrl.noaa.gov/gmd/obop/) for station statistics and personnel. # # The CATS GCs sample air once an hour. Monthly median data are provided in parts-per-trillion, ppt. # Abbreviations used: # yr=year, mon=month, m=monthly data; gc=type of sample--in situ GC data, sd=standard deviation of samples, # n=number of samples, brw=Pt. Barrow, Alaska, sum=Summit, Greenland, nwr= Niwot Ridge, Colorado # mlo=Mauna Loa, Hawaii, smo = American Samoa, spo=South Pole, Antarctica # NAN=not a number or no data, and space(s) is the delimiter. # # The standard deviation (unc) reported is the estimate of insturmental precision. # The standard deviation (sd) reported is the estimate of atmospheric variability. # # year, month, monthly median of CCl4 in ppt, uncertainty (unc), std. dev. (sd), number of samples # CCl4catsNWRyr CCl4catsNWRmon CCl4catsNWRm CCl4catsNWRunc CCl4catsNWRsd CCl4catsNWRn 1998 1 nan nan nan 0 1998 2 nan nan nan 0 1998 3 nan nan nan 0 1998 4 nan nan nan 0 1998 5 nan nan nan 0 1998 6 nan nan nan 0 1998 7 nan nan nan 0 1998 8 nan nan nan 0 1998 9 nan nan nan 0 1998 10 nan nan nan 0 1998 11 nan nan nan 0 1998 12 nan nan nan 0 1999 1 nan nan nan 0 1999 2 nan nan nan 0 1999 3 nan nan nan 0 1999 4 nan nan nan 0 1999 5 nan nan nan 0 1999 6 nan nan nan 0 1999 7 nan nan nan 0 1999 8 nan nan nan 0 1999 9 nan nan nan 0 1999 10 nan nan nan 0 1999 11 nan nan nan 0 1999 12 nan nan nan 0 2000 1 nan nan nan 0 2000 2 nan nan nan 0 2000 3 nan nan nan 0 2000 4 nan nan nan 0 2000 5 nan nan nan 0 2000 6 nan nan nan 0 2000 7 nan nan nan 0 2000 8 nan nan nan 0 2000 9 nan nan nan 0 2000 10 nan nan nan 0 2000 11 nan nan nan 0 2000 12 nan nan nan 0 2001 1 nan nan nan 0 2001 2 nan nan nan 0 2001 3 nan nan nan 0 2001 4 nan nan nan 0 2001 5 99.39 0.43 0.57 702 2001 6 99.16 0.38 0.50 593 2001 7 98.78 0.62 0.44 591 2001 8 98.81 0.68 0.45 480 2001 9 98.98 0.40 0.47 679 2001 10 99.02 0.49 0.54 718 2001 11 99.02 0.44 0.55 708 2001 12 98.99 0.56 0.71 614 2002 1 98.93 0.70 0.71 524 2002 2 98.83 0.90 0.87 479 2002 3 98.69 0.60 0.73 629 2002 4 98.32 0.67 0.55 651 2002 5 98.14 0.54 0.44 689 2002 6 98.26 0.26 0.40 625 2002 7 98.19 0.26 0.30 709 2002 8 98.04 0.25 0.39 737 2002 9 98.32 0.25 0.39 715 2002 10 98.42 0.30 0.41 681 2002 11 98.24 0.34 0.39 679 2002 12 98.21 0.36 0.40 705 2003 1 98.05 0.43 0.45 631 2003 2 97.89 0.33 0.37 503 2003 3 97.85 0.37 0.46 449 2003 4 97.78 0.29 0.38 678 2003 5 97.76 0.32 0.34 616 2003 6 97.48 0.24 0.32 486 2003 7 97.25 0.27 0.41 579 2003 8 97.23 0.47 0.69 700 2003 9 97.36 0.44 0.70 650 2003 10 97.52 0.48 0.64 696 2003 11 97.49 0.51 0.81 712 2003 12 97.34 0.60 0.83 718 2004 1 97.07 0.53 0.78 691 2004 2 96.93 0.61 0.90 666 2004 3 96.87 0.49 0.73 678 2004 4 96.82 0.40 0.51 698 2004 5 96.62 0.39 0.48 670 2004 6 96.61 0.43 0.50 219 2004 7 96.54 1.05 1.54 185 2004 8 97.16 1.11 1.79 540 2004 9 nan nan nan 0 2004 10 nan nan nan 0 2004 11 nan nan nan 0 2004 12 nan nan nan 0 2005 1 nan nan nan 0 2005 2 95.29 0.59 0.80 249 2005 3 95.25 0.52 0.77 690 2005 4 95.35 0.57 0.83 708 2005 5 95.25 0.55 0.79 680 2005 6 95.00 0.46 0.71 159 2005 7 94.69 0.53 0.76 594 2005 8 94.50 0.46 0.70 739 2005 9 94.65 0.71 0.91 581 2005 10 94.73 0.98 1.45 606 2005 11 94.93 0.88 1.33 715 2005 12 94.58 0.76 1.00 716 2006 1 94.30 0.68 0.82 682 2006 2 93.46 0.61 0.78 650 2006 3 93.39 0.78 2.04 734 2006 4 93.42 0.65 1.00 680 2006 5 93.55 0.62 1.09 623 2006 6 93.29 0.62 1.14 715 2006 7 93.29 0.65 0.73 94 2006 8 nan nan nan 0 2006 9 nan nan nan 0 2006 10 nan nan nan 0 2006 11 nan nan nan 0 2006 12 nan nan nan 0 2007 1 nan nan nan 0 2007 2 nan nan nan 0 2007 3 nan nan nan 0 2007 4 nan nan nan 0 2007 5 nan nan nan 0 2007 6 nan nan nan 0 2007 7 nan nan nan 0 2007 8 nan nan nan 0 2007 9 nan nan nan 0 2007 10 nan nan nan 0 2007 11 92.70 0.47 0.51 438 2007 12 92.20 0.51 0.51 330 2008 1 92.43 0.52 0.65 715 2008 2 92.23 0.50 0.61 673 2008 3 92.26 0.50 0.60 712 2008 4 92.13 0.35 0.76 689 2008 5 92.07 0.26 0.97 714 2008 6 92.01 0.26 0.71 710 2008 7 91.74 0.22 0.38 723 2008 8 91.48 0.19 0.30 687 2008 9 91.42 0.23 1.83 709 2008 10 91.37 0.30 0.70 738 2008 11 91.36 0.32 0.44 667 2008 12 91.06 0.42 0.43 722 2009 1 90.80 0.35 0.41 718 2009 2 90.61 0.36 0.34 628 2009 3 90.46 0.28 1.07 741 2009 4 90.28 0.24 0.33 669 2009 5 90.22 0.22 0.46 726 2009 6 90.15 0.23 0.23 702 2009 7 90.00 0.24 0.27 662 2009 8 89.87 0.23 0.24 726 2009 9 89.86 0.22 0.23 631 2009 10 89.44 0.27 0.38 547 2009 11 89.40 0.29 0.46 617 2009 12 89.26 0.43 0.88 640 2010 1 89.18 0.43 2.79 639 2010 2 89.24 0.42 1.04 382 2010 3 88.91 0.34 3.43 660 2010 4 88.80 0.27 0.56 691 2010 5 88.70 0.25 0.36 716 2010 6 88.68 0.22 0.31 717 2010 7 88.51 0.22 0.34 694 2010 8 88.42 0.22 1.20 731 2010 9 88.44 0.28 0.87 695 2010 10 88.60 0.27 0.37 708 2010 11 88.39 0.34 0.69 694 2010 12 88.25 0.26 0.44 677 2011 1 88.05 0.38 0.65 705 2011 2 87.97 0.37 0.69 652 2011 3 87.86 0.33 0.43 539 2011 4 87.82 0.25 1.90 704 2011 5 87.64 0.22 0.31 729 2011 6 87.44 0.22 0.42 575 2011 7 87.16 0.22 0.35 720 2011 8 87.21 0.26 0.53 729 2011 9 87.40 0.25 0.72 690 2011 10 87.40 0.36 0.57 669 2011 11 87.28 0.47 1.21 581 2011 12 87.43 0.48 0.53 631 2012 1 87.26 0.47 0.49 331 2012 2 nan nan nan 0 2012 3 86.81 0.28 0.31 310 2012 4 86.83 0.24 0.29 661 2012 5 86.69 0.19 1.20 655 2012 6 86.49 0.21 1.04 642 2012 7 86.24 0.22 1.85 523 2012 8 86.19 0.19 0.72 556 2012 9 86.21 0.19 0.26 424 2012 10 86.26 0.26 0.36 202 2012 11 86.36 0.23 0.67 435 2012 12 86.21 0.33 0.29 313 2013 1 85.96 0.37 0.72 425 2013 2 85.90 0.29 0.34 458 2013 3 nan nan nan 0 2013 4 nan nan nan 0 2013 5 86.17 0.23 0.36 149 2013 6 85.98 0.19 0.80 717 2013 7 85.48 0.19 1.37 615 2013 8 85.29 0.18 0.41 739 2013 9 85.20 0.32 1.00 653 2013 10 85.34 0.46 1.01 695 2013 11 84.90 0.31 0.42 639 2013 12 84.83 0.41 0.65 240 2014 1 84.57 0.34 0.57 352 2014 2 84.56 0.34 0.56 405 2014 3 84.47 0.29 0.55 343 2014 4 84.50 0.25 0.63 553 2014 5 84.30 0.20 0.46 723 2014 6 84.13 0.18 0.67 657 2014 7 83.96 0.16 0.30 728 2014 8 83.90 0.14 0.28 738 2014 9 84.32 0.13 2.45 353 2014 10 84.44 0.22 2.51 734 2014 11 84.35 0.24 1.11 701 2014 12 84.20 0.27 0.49 725 2015 1 83.93 0.29 0.47 639 2015 2 83.82 0.28 0.42 639 2015 3 83.72 0.22 0.38 702 2015 4 83.53 0.19 0.30 691 2015 5 83.44 0.17 0.24 517 2015 6 83.40 0.18 0.43 538 2015 7 83.03 0.54 0.43 46 2015 8 83.06 0.47 0.33 543 2015 9 83.09 0.35 1.27 635 2015 10 82.91 0.30 0.39 672 2015 11 83.07 0.82 0.36 393 2015 12 82.85 1.10 0.84 583 2016 1 82.72 0.80 0.78 705 2016 2 82.46 0.66 0.52 499 2016 3 82.40 0.42 0.63 667 2016 4 82.54 0.42 0.88 343 2016 5 nan nan nan 0 2016 6 82.35 0.20 0.25 199 2016 7 nan nan nan 0 2016 8 82.01 0.28 0.41 465 2016 9 81.91 0.43 0.63 599 2016 10 81.90 0.46 0.73 716 2016 11 81.99 0.50 0.80 580 2016 12 81.64 0.29 0.36 685 2017 1 81.49 0.32 0.39 676 2017 2 81.46 0.39 0.59 553 2017 3 81.28 0.44 0.60 470 2017 4 81.15 0.42 0.48 256 2017 5 81.22 0.37 0.46 253 2017 6 81.10 0.29 0.41 273 2017 7 80.96 0.20 0.39 146 2017 8 nan nan nan 0 2017 9 nan nan nan 0 2017 10 81.32 0.33 0.46 99 2017 11 81.10 0.31 0.47 705 2017 12 80.91 0.30 0.39 685 2018 1 80.79 0.29 0.43 734 2018 2 80.67 0.28 0.40 657 2018 3 80.44 0.33 0.35 714 2018 4 80.47 0.29 0.32 718 2018 5 80.36 0.27 0.36 725 2018 6 80.13 0.23 0.38 680 2018 7 80.13 0.32 0.74 346 2018 8 80.12 0.41 0.54 668 2018 9 80.01 0.49 0.31 495 2018 10 80.01 1.80 0.45 65 2018 11 80.20 1.78 0.39 123 2018 12 80.04 1.33 0.55 37 2019 1 nan nan nan 0 2019 2 nan nan nan 0 2019 3 nan nan nan 0 2019 4 nan nan nan 0 2019 5 nan nan nan 0 2019 6 nan nan nan 0 2019 7 79.09 0.19 0.42 514 2019 8 78.98 0.21 0.37 706 2019 9 78.88 0.27 0.46 475 2019 10 nan nan nan 0 2019 11 78.78 0.36 0.48 81 2019 12 nan nan nan 0 2020 1 nan nan nan 0 2020 2 nan nan nan 0 2020 3 nan nan nan 0 2020 4 nan nan nan 0 2020 5 78.51 0.87 0.75 149 2020 6 78.20 0.73 0.64 498 2020 7 77.99 0.50 0.48 295 2020 8 77.89 0.50 0.47 687 2020 9 78.07 0.48 0.57 370 2020 10 77.91 0.54 0.70 696 2020 11 77.64 0.54 0.50 632 2020 12 77.43 0.50 0.43 548 2021 1 77.19 0.82 0.57 297 2021 2 nan nan nan 0 2021 3 77.05 0.37 0.46 424 2021 4 76.98 0.35 0.54 543 2021 5 76.91 0.37 0.61 627 2021 6 76.74 0.36 0.49 632 2021 7 76.44 0.39 0.49 510 2021 8 nan nan nan 0 2021 9 nan nan nan 0 2021 10 76.17 0.59 0.72 196 2021 11 76.23 1.58 1.01 597 2021 12 76.14 0.49 0.49 455 2022 1 75.92 0.31 0.35 607 2022 2 75.89 0.29 0.38 669 2022 3 76.00 0.20 0.43 409 2022 4 75.81 0.34 0.47 307 2022 5 75.98 0.20 0.47 307 2022 6 75.68 0.20 0.30 335 2022 7 75.66 0.23 0.33 196 2022 8 75.32 0.43 0.35 629 2022 9 75.09 0.54 0.38 718 2022 10 75.06 0.26 0.37 680 2022 11 75.00 0.23 0.28 712 2022 12 74.97 0.24 0.28 709 2023 1 74.80 0.21 0.24 630 2023 2 74.63 0.25 0.29 366 2023 3 74.48 0.28 0.28 417 2023 4 nan nan nan 0 2023 5 nan nan nan 0 2023 6 nan nan nan 0 2023 7 nan nan nan 0 2023 8 nan nan nan 0