% ACRF 2009 4th quarter metric % Year-long time series of aerosol optical depth at NSA Barrow, % Lat 71.323 N, Lon -156.609 E, Alt 8 m above mean sea level % The aod values are a composite of NIMFR measurements and an empirical % regression involving surface relative humidity, surface aerosol scattering, and % average relative humidity in the boundary layer. yyyy, mm, dd, HH, doy, aod_500nm, angstrom_exponent_415_840nm 2008, 1, 1, 12, 1.5, NaN, 1.494 2008, 1, 2, 12, 2.5, NaN, 1.158 2008, 1, 3, 12, 3.5, NaN, 0.771 2008, 1, 4, 12, 4.5, NaN, 1.018 2008, 1, 5, 12, 5.5, NaN, 1.304 2008, 1, 6, 12, 6.5, NaN, 1.354 2008, 1, 7, 12, 7.5, NaN, 1.388 2008, 1, 8, 12, 8.5, NaN, 0.834 2008, 1, 9, 12, 9.5, NaN, 0.786 2008, 1, 10, 12, 10.5, NaN, 1.176 2008, 1, 11, 12, 11.5, NaN, NaN 2008, 1, 12, 12, 12.5, NaN, NaN 2008, 1, 13, 12, 13.5, NaN, NaN 2008, 1, 14, 12, 14.5, NaN, NaN 2008, 1, 15, 12, 15.5, NaN, 1.099 2008, 1, 16, 12, 16.5, NaN, 2.101 2008, 1, 17, 12, 17.5, NaN, 0.603 2008, 1, 18, 12, 18.5, NaN, 0.990 2008, 1, 19, 12, 19.5, NaN, 1.417 2008, 1, 20, 12, 20.5, NaN, 1.527 2008, 1, 21, 12, 21.5, NaN, NaN 2008, 1, 22, 12, 22.5, NaN, NaN 2008, 1, 23, 12, 23.5, NaN, NaN 2008, 1, 24, 12, 24.5, NaN, NaN 2008, 1, 25, 12, 25.5, NaN, NaN 2008, 1, 26, 12, 26.5, NaN, NaN 2008, 1, 27, 12, 27.5, NaN, NaN 2008, 1, 28, 12, 28.5, NaN, NaN 2008, 1, 29, 12, 29.5, NaN, NaN 2008, 1, 30, 12, 30.5, NaN, NaN 2008, 1, 31, 12, 31.5, NaN, NaN 2008, 2, 1, 12, 32.5, NaN, NaN 2008, 2, 2, 12, 33.5, NaN, NaN 2008, 2, 3, 12, 34.5, NaN, NaN 2008, 2, 4, 12, 35.5, NaN, NaN 2008, 2, 5, 12, 36.5, NaN, NaN 2008, 2, 6, 12, 37.5, NaN, 1.322 2008, 2, 7, 12, 38.5, NaN, 1.609 2008, 2, 8, 12, 39.5, NaN, 1.357 2008, 2, 9, 12, 40.5, NaN, 1.519 2008, 2, 10, 12, 41.5, NaN, 1.454 2008, 2, 11, 12, 42.5, NaN, 0.809 2008, 2, 12, 12, 43.5, NaN, 0.937 2008, 2, 13, 12, 44.5, NaN, 0.825 2008, 2, 14, 12, 45.5, NaN, 0.872 2008, 2, 15, 12, 46.5, NaN, 0.763 2008, 2, 16, 12, 47.5, NaN, 0.591 2008, 2, 17, 12, 48.5, NaN, 0.764 2008, 2, 18, 12, 49.5, NaN, 1.070 2008, 2, 19, 12, 50.5, NaN, 1.080 2008, 2, 20, 12, 51.5, NaN, 0.655 2008, 2, 21, 12, 52.5, NaN, 0.932 2008, 2, 22, 12, 53.5, NaN, NaN 2008, 2, 23, 12, 54.5, NaN, NaN 2008, 2, 24, 12, 55.5, NaN, NaN 2008, 2, 25, 12, 56.5, NaN, 1.138 2008, 2, 26, 12, 57.5, NaN, 1.152 2008, 2, 27, 12, 58.5, NaN, 1.280 2008, 2, 28, 12, 59.5, NaN, 1.115 2008, 2, 29, 12, 60.5, NaN, 0.598 2008, 3, 1, 12, 61.5, 0.191, 0.531 2008, 3, 2, 12, 62.5, 0.127, 0.898 2008, 3, 3, 12, 63.5, 0.172, 1.269 2008, 3, 4, 12, 64.5, 0.205, 1.072 2008, 3, 5, 12, 65.5, 0.193, 1.324 2008, 3, 6, 12, 66.5, 0.143, 1.335 2008, 3, 7, 12, 67.5, 0.109, 1.056 2008, 3, 8, 12, 68.5, 0.102, 1.318 2008, 3, 9, 12, 69.5, 0.102, 1.392 2008, 3, 10, 12, 70.5, 0.114, 1.703 2008, 3, 11, 12, 71.5, 0.133, 1.231 2008, 3, 12, 12, 72.5, 0.115, 1.250 2008, 3, 13, 12, 73.5, 0.125, 1.162 2008, 3, 14, 12, 74.5, 0.065, 1.227 2008, 3, 15, 12, 75.5, 0.124, 1.861 2008, 3, 16, 12, 76.5, 0.140, 1.825 2008, 3, 17, 12, 77.5, 0.099, 1.744 2008, 3, 18, 12, 78.5, 0.091, 1.515 2008, 3, 19, 12, 79.5, 0.098, 1.638 2008, 3, 20, 12, 80.5, 0.103, 1.937 2008, 3, 21, 12, 81.5, 0.151, 1.281 2008, 3, 22, 12, 82.5, 0.191, 1.541 2008, 3, 23, 12, 83.5, 0.151, 1.386 2008, 3, 24, 12, 84.5, 0.165, 1.445 2008, 3, 25, 12, 85.5, 0.174, 1.266 2008, 3, 26, 12, 86.5, 0.216, 1.066 2008, 3, 27, 12, 87.5, 0.120, 1.367 2008, 3, 28, 12, 88.5, 0.144, 1.406 2008, 3, 29, 12, 89.5, 0.121, 1.563 2008, 3, 30, 12, 90.5, 0.150, 1.652 2008, 3, 31, 12, 91.5, 0.158, 1.451 2008, 4, 1, 12, 92.5, 0.164, 1.428 2008, 4, 2, 12, 93.5, 0.132, 1.406 2008, 4, 3, 12, 94.5, 0.164, 1.294 2008, 4, 4, 12, 95.5, 0.274, 0.752 2008, 4, 5, 12, 96.5, 0.214, 0.706 2008, 4, 6, 12, 97.5, 0.149, 0.758 2008, 4, 7, 12, 98.5, 0.127, 0.932 2008, 4, 8, 12, 99.5, 0.110, 1.041 2008, 4, 9, 12, 100.5, 0.180, 1.176 2008, 4, 10, 12, 101.5, 0.124, 1.527 2008, 4, 11, 12, 102.5, 0.137, 1.705 2008, 4, 12, 12, 103.5, 0.166, 1.668 2008, 4, 13, 12, 104.5, 0.208, 1.655 2008, 4, 14, 12, 105.5, 0.109, 1.620 2008, 4, 15, 12, 106.5, 0.148, 1.588 2008, 4, 16, 12, 107.5, 0.189, 1.194 2008, 4, 17, 12, 108.5, 0.178, 1.866 2008, 4, 18, 12, 109.5, 0.159, 1.644 2008, 4, 19, 12, 110.5, 0.231, 1.256 2008, 4, 20, 12, 111.5, NaN, 1.370 2008, 4, 21, 12, 112.5, 0.235, 1.378 2008, 4, 22, 12, 113.5, 0.242, 1.443 2008, 4, 23, 12, 114.5, 0.291, 1.267 2008, 4, 24, 12, 115.5, 0.327, 1.119 2008, 4, 25, 12, 116.5, NaN, 1.266 2008, 4, 26, 12, 117.5, 0.241, 1.438 2008, 4, 27, 12, 118.5, 0.215, 1.553 2008, 4, 28, 12, 119.5, 0.214, 1.524 2008, 4, 29, 12, 120.5, 0.210, 1.499 2008, 4, 30, 12, 121.5, 0.139, 1.470 2008, 5, 1, 12, 122.5, 0.231, 1.498 2008, 5, 2, 12, 123.5, 0.240, 1.034 2008, 5, 3, 12, 124.5, 0.250, 1.155 2008, 5, 4, 12, 125.5, 0.258, 1.350 2008, 5, 5, 12, 126.5, 0.222, 1.460 2008, 5, 6, 12, 127.5, 0.214, 1.490 2008, 5, 7, 12, 128.5, 0.228, 1.601 2008, 5, 8, 12, 129.5, 0.224, 1.787 2008, 5, 9, 12, 130.5, 0.246, 2.066 2008, 5, 10, 12, 131.5, NaN, 2.150 2008, 5, 11, 12, 132.5, 0.257, 2.007 2008, 5, 12, 12, 133.5, 0.227, 1.746 2008, 5, 13, 12, 134.5, 0.221, 1.826 2008, 5, 14, 12, 135.5, 0.246, 2.067 2008, 5, 15, 12, 136.5, 0.265, 2.026 2008, 5, 16, 12, 137.5, NaN, 2.016 2008, 5, 17, 12, 138.5, 0.217, 2.053 2008, 5, 18, 12, 139.5, 0.216, 1.771 2008, 5, 19, 12, 140.5, 0.214, 1.876 2008, 5, 20, 12, 141.5, 0.225, 1.903 2008, 5, 21, 12, 142.5, 0.239, 1.851 2008, 5, 22, 12, 143.5, 0.222, 2.016 2008, 5, 23, 12, 144.5, 0.094, 1.813 2008, 5, 24, 12, 145.5, 0.121, 1.775 2008, 5, 25, 12, 146.5, 0.115, 1.596 2008, 5, 26, 12, 147.5, 0.111, 1.567 2008, 5, 27, 12, 148.5, 0.162, 1.424 2008, 5, 28, 12, 149.5, NaN, NaN 2008, 5, 29, 12, 150.5, NaN, NaN 2008, 5, 30, 12, 151.5, NaN, NaN 2008, 5, 31, 12, 152.5, 0.149, 1.859 2008, 6, 1, 12, 153.5, 0.055, 0.832 2008, 6, 2, 12, 154.5, 0.054, 1.637 2008, 6, 3, 12, 155.5, 0.054, 1.600 2008, 6, 4, 12, 156.5, 0.054, 1.307 2008, 6, 5, 12, 157.5, NaN, 0.944 2008, 6, 6, 12, 158.5, NaN, 0.796 2008, 6, 7, 12, 159.5, 0.054, 1.106 2008, 6, 8, 12, 160.5, 0.057, 1.462 2008, 6, 9, 12, 161.5, 0.055, 1.584 2008, 6, 10, 12, 162.5, 0.054, 1.717 2008, 6, 11, 12, 163.5, 0.059, 1.786 2008, 6, 12, 12, 164.5, 0.052, 1.902 2008, 6, 13, 12, 165.5, 0.051, 1.918 2008, 6, 14, 12, 166.5, 0.055, 1.724 2008, 6, 15, 12, 167.5, 0.052, 1.504 2008, 6, 16, 12, 168.5, 0.057, 1.296 2008, 6, 17, 12, 169.5, 0.054, 2.678 2008, 6, 18, 12, 170.5, NaN, 2.741 2008, 6, 19, 12, 171.5, 0.051, 2.072 2008, 6, 20, 12, 172.5, 0.054, 1.759 2008, 6, 21, 12, 173.5, 0.050, 1.968 2008, 6, 22, 12, 174.5, 0.050, 1.917 2008, 6, 23, 12, 175.5, 0.053, 2.046 2008, 6, 24, 12, 176.5, 0.054, 1.575 2008, 6, 25, 12, 177.5, 0.055, 1.427 2008, 6, 26, 12, 178.5, NaN, NaN 2008, 6, 27, 12, 179.5, NaN, NaN 2008, 6, 28, 12, 180.5, NaN, NaN 2008, 6, 29, 12, 181.5, NaN, NaN 2008, 6, 30, 12, 182.5, 0.042, 2.415 2008, 7, 1, 12, 183.5, 0.055, 1.992 2008, 7, 2, 12, 184.5, 0.048, 2.219 2008, 7, 3, 12, 185.5, 0.058, 1.804 2008, 7, 4, 12, 186.5, 0.067, 1.548 2008, 7, 5, 12, 187.5, 0.081, 0.919 2008, 7, 6, 12, 188.5, 0.071, 1.404 2008, 7, 7, 12, 189.5, 0.063, 2.108 2008, 7, 8, 12, 190.5, 0.054, 1.834 2008, 7, 9, 12, 191.5, 0.091, 1.845 2008, 7, 10, 12, 192.5, 0.075, 1.943 2008, 7, 11, 12, 193.5, 0.066, 1.601 2008, 7, 12, 12, 194.5, NaN, 0.906 2008, 7, 13, 12, 195.5, NaN, 1.550 2008, 7, 14, 12, 196.5, 0.075, 2.122 2008, 7, 15, 12, 197.5, 0.077, 2.219 2008, 7, 16, 12, 198.5, 0.063, 2.198 2008, 7, 17, 12, 199.5, 0.056, 1.147 2008, 7, 18, 12, 200.5, 0.054, 1.162 2008, 7, 19, 12, 201.5, 0.057, 0.985 2008, 7, 20, 12, 202.5, 0.074, 0.913 2008, 7, 21, 12, 203.5, 0.061, 1.970 2008, 7, 22, 12, 204.5, 0.072, 1.346 2008, 7, 23, 12, 205.5, NaN, 1.849 2008, 7, 24, 12, 206.5, 0.070, 2.343 2008, 7, 25, 12, 207.5, 0.088, 0.813 2008, 7, 26, 12, 208.5, 0.074, 1.188 2008, 7, 27, 12, 209.5, 0.084, 1.480 2008, 7, 28, 12, 210.5, 0.073, 2.084 2008, 7, 29, 12, 211.5, 0.065, 2.144 2008, 7, 30, 12, 212.5, NaN, 2.150 2008, 7, 31, 12, 213.5, NaN, 2.150 2008, 8, 1, 12, 214.5, NaN, NaN 2008, 8, 2, 12, 215.5, NaN, NaN 2008, 8, 3, 12, 216.5, NaN, NaN 2008, 8, 4, 12, 217.5, 0.062, 1.129 2008, 8, 5, 12, 218.5, NaN, 2.122 2008, 8, 6, 12, 219.5, 0.083, 1.759 2008, 8, 7, 12, 220.5, 0.089, 0.965 2008, 8, 8, 12, 221.5, 0.083, 1.138 2008, 8, 9, 12, 222.5, 0.076, 1.157 2008, 8, 10, 12, 223.5, 0.069, 2.296 2008, 8, 11, 12, 224.5, 0.077, 2.411 2008, 8, 12, 12, 225.5, 0.080, 1.688 2008, 8, 13, 12, 226.5, 0.087, 1.226 2008, 8, 14, 12, 227.5, 0.082, 0.823 2008, 8, 15, 12, 228.5, 0.080, 1.131 2008, 8, 16, 12, 229.5, 0.070, 1.115 2008, 8, 17, 12, 230.5, 0.086, 1.143 2008, 8, 18, 12, 231.5, 0.080, 1.675 2008, 8, 19, 12, 232.5, 0.081, 1.159 2008, 8, 20, 12, 233.5, 0.092, 0.911 2008, 8, 21, 12, 234.5, 0.120, 1.658 2008, 8, 22, 12, 235.5, 0.118, 1.655 2008, 8, 23, 12, 236.5, 0.105, 1.643 2008, 8, 24, 12, 237.5, 0.117, 1.657 2008, 8, 25, 12, 238.5, NaN, 1.572 2008, 8, 26, 12, 239.5, 0.089, 1.629 2008, 8, 27, 12, 240.5, 0.081, 0.942 2008, 8, 28, 12, 241.5, 0.079, 1.799 2008, 8, 29, 12, 242.5, 0.078, 1.319 2008, 8, 30, 12, 243.5, 0.087, 1.168 2008, 8, 31, 12, 244.5, 0.089, 1.441 2008, 9, 1, 12, 245.5, 0.146, 1.066 2008, 9, 2, 12, 246.5, 0.184, 1.297 2008, 9, 3, 12, 247.5, 0.154, 0.624 2008, 9, 4, 12, 248.5, 0.168, 0.828 2008, 9, 5, 12, 249.5, 0.169, 0.940 2008, 9, 6, 12, 250.5, 0.121, 1.135 2008, 9, 7, 12, 251.5, 0.147, 1.803 2008, 9, 8, 12, 252.5, 0.187, 2.513 2008, 9, 9, 12, 253.5, 0.076, 1.533 2008, 9, 10, 12, 254.5, 0.072, 1.046 2008, 9, 11, 12, 255.5, NaN, NaN 2008, 9, 12, 12, 256.5, NaN, NaN 2008, 9, 13, 12, 257.5, 0.109, 1.154 2008, 9, 14, 12, 258.5, 0.101, 1.185 2008, 9, 15, 12, 259.5, 0.121, 0.987 2008, 9, 16, 12, 260.5, 0.146, 0.821 2008, 9, 17, 12, 261.5, 0.164, 1.129 2008, 9, 18, 12, 262.5, 0.179, 1.135 2008, 9, 19, 12, 263.5, 0.213, 1.098 2008, 9, 20, 12, 264.5, 0.166, 1.362 2008, 9, 21, 12, 265.5, NaN, 2.902 2008, 9, 22, 12, 266.5, NaN, 1.886 2008, 9, 23, 12, 267.5, 0.151, 0.930 2008, 9, 24, 12, 268.5, 0.134, 1.099 2008, 9, 25, 12, 269.5, 0.132, 2.026 2008, 9, 26, 12, 270.5, 0.104, 1.788 2008, 9, 27, 12, 271.5, 0.120, 0.932 2008, 9, 28, 12, 272.5, 0.110, 2.688 2008, 9, 29, 12, 273.5, 0.099, 2.274 2008, 9, 30, 12, 274.5, 0.119, 0.955 2008, 10, 1, 12, 275.5, NaN, 1.144 2008, 10, 2, 12, 276.5, NaN, 0.983 2008, 10, 3, 12, 277.5, NaN, 1.718 2008, 10, 4, 12, 278.5, NaN, 1.753 2008, 10, 5, 12, 279.5, NaN, 1.902 2008, 10, 6, 12, 280.5, NaN, 1.397 2008, 10, 7, 12, 281.5, NaN, 1.087 2008, 10, 8, 12, 282.5, NaN, 0.878 2008, 10, 9, 12, 283.5, NaN, 1.106 2008, 10, 10, 12, 284.5, NaN, 1.114 2008, 10, 11, 12, 285.5, NaN, 0.873 2008, 10, 12, 12, 286.5, NaN, 0.884 2008, 10, 13, 12, 287.5, NaN, 1.175 2008, 10, 14, 12, 288.5, 0.082, 0.937 2008, 10, 15, 12, 289.5, NaN, 0.885 2008, 10, 16, 12, 290.5, NaN, 0.996 2008, 10, 17, 12, 291.5, NaN, 1.244 2008, 10, 18, 12, 292.5, NaN, NaN 2008, 10, 19, 12, 293.5, NaN, NaN 2008, 10, 20, 12, 294.5, NaN, NaN 2008, 10, 21, 12, 295.5, NaN, 0.994 2008, 10, 22, 12, 296.5, NaN, 0.961 2008, 10, 23, 12, 297.5, NaN, 1.023 2008, 10, 24, 12, 298.5, NaN, 1.447 2008, 10, 25, 12, 299.5, NaN, NaN 2008, 10, 26, 12, 300.5, NaN, NaN 2008, 10, 27, 12, 301.5, NaN, NaN 2008, 10, 28, 12, 302.5, NaN, NaN 2008, 10, 29, 12, 303.5, NaN, NaN 2008, 10, 30, 12, 304.5, NaN, 1.814 2008, 10, 31, 12, 305.5, NaN, 1.900 2008, 11, 1, 12, 306.5, NaN, 1.575 2008, 11, 2, 12, 307.5, NaN, 1.731 2008, 11, 3, 12, 308.5, NaN, 1.711 2008, 11, 4, 12, 309.5, NaN, 1.335 2008, 11, 5, 12, 310.5, NaN, 1.260 2008, 11, 6, 12, 311.5, NaN, 1.616 2008, 11, 7, 12, 312.5, NaN, 1.150 2008, 11, 8, 12, 313.5, NaN, 1.492 2008, 11, 9, 12, 314.5, NaN, 1.644 2008, 11, 10, 12, 315.5, NaN, 1.100 2008, 11, 11, 12, 316.5, NaN, 1.039 2008, 11, 12, 12, 317.5, NaN, 1.287 2008, 11, 13, 12, 318.5, NaN, 1.220 2008, 11, 14, 12, 319.5, NaN, 1.022 2008, 11, 15, 12, 320.5, NaN, 1.481 2008, 11, 16, 12, 321.5, NaN, 2.582 2008, 11, 17, 12, 322.5, NaN, 2.133 2008, 11, 18, 12, 323.5, NaN, 1.674 2008, 11, 19, 12, 324.5, NaN, 1.506 2008, 11, 20, 12, 325.5, NaN, 1.344 2008, 11, 21, 12, 326.5, NaN, 1.515 2008, 11, 22, 12, 327.5, NaN, 1.177 2008, 11, 23, 12, 328.5, NaN, 0.876 2008, 11, 24, 12, 329.5, NaN, 0.850 2008, 11, 25, 12, 330.5, NaN, 1.017 2008, 11, 26, 12, 331.5, NaN, 1.504 2008, 11, 27, 12, 332.5, NaN, NaN 2008, 11, 28, 12, 333.5, NaN, NaN 2008, 11, 29, 12, 334.5, NaN, NaN 2008, 11, 30, 12, 335.5, NaN, 1.126 2008, 12, 1, 12, 336.5, NaN, 1.799 2008, 12, 2, 12, 337.5, NaN, NaN 2008, 12, 3, 12, 338.5, NaN, NaN 2008, 12, 4, 12, 339.5, NaN, 1.565 2008, 12, 5, 12, 340.5, NaN, NaN 2008, 12, 6, 12, 341.5, NaN, NaN 2008, 12, 7, 12, 342.5, NaN, NaN 2008, 12, 8, 12, 343.5, NaN, 1.068 2008, 12, 9, 12, 344.5, NaN, 1.083 2008, 12, 10, 12, 345.5, NaN, 1.001 2008, 12, 11, 12, 346.5, NaN, 0.793 2008, 12, 12, 12, 347.5, NaN, 0.639 2008, 12, 13, 12, 348.5, NaN, 1.068 2008, 12, 14, 12, 349.5, NaN, NaN 2008, 12, 15, 12, 350.5, NaN, NaN 2008, 12, 16, 12, 351.5, NaN, NaN 2008, 12, 17, 12, 352.5, NaN, 1.592 2008, 12, 18, 12, 353.5, NaN, 1.127 2008, 12, 19, 12, 354.5, NaN, NaN 2008, 12, 20, 12, 355.5, NaN, NaN 2008, 12, 21, 12, 356.5, NaN, NaN 2008, 12, 22, 12, 357.5, NaN, NaN 2008, 12, 23, 12, 358.5, NaN, NaN 2008, 12, 24, 12, 359.5, NaN, NaN 2008, 12, 25, 12, 360.5, NaN, NaN 2008, 12, 26, 12, 361.5, NaN, NaN 2008, 12, 27, 12, 362.5, NaN, NaN 2008, 12, 28, 12, 363.5, NaN, NaN 2008, 12, 29, 12, 364.5, NaN, NaN 2008, 12, 30, 12, 365.5, NaN, NaN 2008, 12, 31, 12, 366.5, NaN, NaN