Quality assessment of Redsox-II LADCP current Profiles ====================================================== Hartmut Peters, 5/13-14/02, based partly on work by S. Matt Executive 3-sentence summary: Uncertainties in the RSX-2 LADCP data are slightly larger than for RSX-1 owing to more significant problems with the raw data. If a single number has to characterize yhe uncertainty, it is maybe +- 4 cm/s. At this point it is known that the station average Sadcp data partly have large uncertainties owing to poor reference. This topic remains to be explored, and hence the Ladcp/Sadcp comparison is only tentative. The upcasts of # 022 and 071 were declared 'bad.' Check on consistency of 'nav' reference vs. bottom track ======================================================== Statistics of depth-averages var mean sdev min max n ----------------------------------------------------------- ubt 0.000963699 0.0322488 -0.0850825 0.126579 125 vbt 0.0072565 0.034694 -0.107481 0.123616 125 Individual data, depth-average CAST ubt vbt ------------------------------ 1.000 -0.025 0.004 2.000 -0.002 0.004 47.000 0.044 0.001 50.000 0.010 0.003 52.000 -0.008 0.032 53.000 0.020 0.020 54.000 0.013 0.033 61.000 -0.066 0.087 62.000 0.009 0.024 72.000 0.002 0.009 76.000 0.016 0.001 77.000 0.004 0.009 79.000 0.023 -0.006 80.000 -0.007 0.025 81.000 0.029 -0.002 83.000 -0.041 0.022 84.000 -0.004 -0.019 85.000 -0.040 -0.006 86.000 -0.006 0.012 87.000 -0.041 0.044 88.000 0.012 0.017 89.000 -0.011 0.020 90.000 -0.031 0.045 91.000 -0.023 0.037 92.000 -0.002 0.028 93.000 -0.004 0.037 94.000 0.005 0.043 95.000 -0.024 -0.061 96.000 -0.000 0.010 97.000 -0.052 0.016 98.000 -0.001 0.071 99.000 -0.084 0.121 100.000 -0.019 0.124 101.000 0.045 -0.000 102.000 -0.009 0.069 103.000 0.012 0.066 104.000 -0.013 0.044 105.000 -0.019 0.068 106.000 0.006 0.056 107.000 0.035 -0.042 108.000 0.002 0.001 109.000 0.034 -0.001 110.000 0.013 -0.026 111.000 0.006 0.003 112.000 0.036 0.006 113.000 0.017 -0.017 114.000 -0.002 0.048 115.000 0.015 0.031 116.000 -0.041 -0.008 118.000 -0.002 -0.044 119.000 0.009 0.015 120.000 0.000 0.006 122.000 0.016 -0.016 123.000 -0.018 -0.015 124.000 -0.016 -0.003 125.000 -0.008 0.030 126.000 0.006 0.012 127.000 -0.007 -0.008 128.000 -0.001 -0.002 129.000 0.003 0.001 130.000 -0.007 0.002 131.000 -0.005 -0.015 132.000 -0.002 0.015 133.000 -0.018 -0.000 134.000 0.019 0.011 135.000 0.005 0.004 136.000 0.004 0.016 138.000 -0.013 -0.003 139.000 -0.030 -0.069 141.000 0.010 -0.013 142.000 0.037 -0.018 143.000 -0.001 -0.000 144.000 0.004 0.010 145.000 -0.004 -0.004 146.000 0.004 -0.015 147.000 -0.006 -0.013 148.000 -0.002 -0.008 149.000 -0.007 0.017 150.000 -0.011 -0.009 151.000 0.070 -0.004 152.000 -0.008 -0.000 153.000 0.016 0.022 154.000 -0.002 0.007 155.000 0.036 -0.007 156.000 0.014 0.000 157.000 0.029 0.010 158.000 0.008 -0.004 159.000 -0.013 0.005 160.000 0.010 -0.020 161.000 0.009 0.016 162.000 0.070 -0.017 163.000 0.027 -0.012 165.000 -0.032 0.037 166.000 -0.022 0.028 167.000 0.045 0.061 168.000 0.016 -0.001 169.000 0.037 -0.008 175.000 0.028 -0.030 178.000 -0.010 0.024 179.000 0.093 0.040 180.000 -0.015 -0.016 181.000 -0.014 -0.024 182.000 -0.055 0.012 183.000 0.056 0.008 185.000 0.000 -0.038 186.000 0.027 -0.107 187.000 -0.067 -0.059 188.000 -0.020 0.029 189.000 0.092 -0.052 190.000 0.033 0.089 191.000 0.035 0.004 192.000 0.012 -0.040 194.000 -0.085 -0.014 197.000 0.002 -0.004 199.000 -0.003 0.014 200.000 0.127 -0.099 207.000 0.020 -0.035 208.000 -0.056 0.044 209.000 -0.060 -0.001 212.000 0.012 -0.017 216.000 -0.005 0.015 217.000 -0.005 0.028 218.000 -0.025 -0.005 223.000 -0.071 0.048 224.000 -0.027 -0.006 Bottom track better then navigation - sometimes =============================================== On average, using 'nav' reference improves the Ladcp/Sadcp comparison. The following table has 'n' for nav and b for btr. var avg sdev min max n ----------------------------------------------------------- dun 0.00213723 0.0403231 -0.132709 0.203517 154 dvn 0.0108506 0.0394442 -0.169804 0.172018 154 dub -0.000617871 0.052807 -0.147133 0.138889 154 dvb 0.00550106 0.0496962 -0.222868 0.209787 154 However, the following casts have at least 75% smaller velocity deviation variance Ladcp/Sadcp for btr reference than for nav reference. CAST dun dvn dub dvb --------------------------------------- 53.00 -0.01 0.09 -0.03 0.07 54.00 0.04 0.04 0.03 0.00 62.00 0.02 0.03 0.01 0.00 77.00 0.00 0.01 -0.00 -0.00 83.00 -0.02 0.06 0.02 0.04 85.00 -0.08 -0.01 -0.04 -0.01 86.00 -0.01 0.02 -0.01 0.01 90.00 -0.08 0.02 -0.05 -0.02 93.00 0.02 0.04 0.02 0.00 95.00 -0.05 -0.09 -0.03 -0.03 98.00 -0.01 0.08 -0.01 0.01 99.00 -0.04 0.10 0.04 -0.02 100.00 0.00 0.15 0.02 0.02 101.00 0.11 -0.01 0.07 -0.01 103.00 0.00 0.06 -0.01 -0.01 104.00 -0.00 0.10 0.01 0.06 105.00 -0.13 0.10 -0.11 0.04 106.00 -0.03 0.11 -0.03 0.06 108.00 0.00 0.01 0.00 0.01 122.00 0.03 -0.01 0.01 0.01 123.00 -0.03 -0.02 -0.01 -0.00 126.00 -0.01 0.02 -0.02 0.01 130.00 -0.02 0.01 -0.01 0.01 133.00 -0.01 0.00 0.01 0.00 135.00 0.02 0.02 0.02 0.02 141.00 0.05 -0.03 0.04 -0.01 145.00 -0.03 -0.03 -0.02 -0.03 149.00 -0.01 0.05 -0.01 0.03 152.00 -0.05 0.02 -0.04 0.02 155.00 0.03 0.01 -0.01 0.02 167.00 0.04 0.02 -0.00 -0.04 176.00 -0.02 0.01 0.00 -0.00 178.00 -0.00 0.03 0.00 0.00 199.00 -0.01 0.01 -0.00 -0.00 200.00 0.20 -0.17 0.08 -0.07 221.00 0.02 -0.01 -0.01 -0.01 222.00 0.03 0.01 -0.01 0.01 Up-down comparison ================================= a) Statistics of depth-averages mean sdev min max n ------------------------------------------------------------- du 0.00608878 0.0314965 -0.059261 0.0950024 66 dv 0.00760301 0.0286087 -0.0728887 0.0951301 66 b) Statistics of indivdual data points mean sdev min max n ------------------------------------------------------------- du 0.00679184 0.045963 -0.190719 0.280049 2631 dv 0.00850277 0.0415487 -0.145901 0.41774 2631 c) Casts, depth-average CAST delta_u delta_v --------------------------------- 3.000 0.052 0.031 4.000 0.034 0.000 5.000 0.038 0.022 6.000 -0.013 0.025 7.000 0.008 -0.006 8.000 0.043 0.037 9.000 0.010 0.056 10.000 -0.014 -0.030 11.000 0.049 0.063 12.000 -0.019 -0.013 13.000 -0.036 0.018 14.000 0.018 -0.017 15.000 -0.006 0.018 16.000 0.006 0.001 17.000 -0.004 0.029 18.000 0.008 0.002 19.000 -0.006 0.001 20.000 -0.005 0.004 21.000 -0.017 0.015 23.000 -0.031 -0.010 24.000 0.074 0.052 25.000 0.030 0.004 26.000 -0.019 -0.004 27.000 -0.005 -0.002 28.000 0.044 -0.028 29.000 -0.051 -0.060 30.000 -0.014 -0.006 31.000 0.035 -0.030 32.000 -0.047 0.030 33.000 -0.014 -0.009 34.000 -0.059 -0.012 35.000 0.028 -0.011 36.000 0.005 0.005 37.000 0.012 0.003 38.000 -0.040 -0.073 39.000 -0.059 0.013 40.000 -0.002 -0.006 41.000 0.024 -0.005 42.000 -0.003 0.013 43.000 0.054 0.003 44.000 0.016 0.025 45.000 -0.002 0.016 46.000 -0.004 -0.004 48.000 -0.027 -0.018 49.000 0.030 0.048 51.000 -0.008 -0.031 55.000 0.006 -0.006 56.000 -0.017 -0.022 57.000 -0.002 0.010 58.000 -0.002 0.012 59.000 -0.009 -0.016 60.000 0.018 0.037 63.000 0.025 0.003 64.000 0.026 0.009 65.000 -0.007 0.013 66.000 0.023 0.025 67.000 0.008 0.006 68.000 0.009 0.061 69.000 -0.023 -0.019 70.000 -0.035 0.073 71.000 0.095 0.095 73.000 0.066 0.031 74.000 0.021 0.018 75.000 0.015 -0.008 78.000 0.001 -0.005 82.000 0.070 0.026 Ladcp/Sadcp comparison, 'nav' reference ======================================= Statistics of cast average LADCP/SADCP velocity deviations, rsx2 var avg std min max n ---------------------------------------------------- du 0.00213723 0.0403231 -0.132709 0.203517 154 dv 0.0108506 0.0394442 -0.169804 0.172018 154 Statistics of all individual data points, LADCP/SADCP vel. deviations var avg std min max n -------------------------------------------------------------- du 0.00397997 0.0450927 -0.174958 0.361458 5309 dv 0.00677216 0.0404405 -0.266664 0.264466 5309 Individual casts, depth average cast du dv ------------------------------- 1.000 0.011 0.019 2.000 0.029 0.003 47.000 0.022 -0.018 50.000 -0.080 0.051 52.000 -0.018 0.012 53.000 -0.014 0.093 54.000 0.042 0.038 61.000 0.044 0.021 62.000 0.022 0.025 72.000 -0.006 -0.020 76.000 0.011 0.024 77.000 0.003 0.009 79.000 -0.021 -0.012 80.000 -0.007 -0.030 81.000 -0.024 -0.039 83.000 -0.023 0.057 84.000 -0.019 0.087 85.000 -0.083 -0.013 86.000 -0.015 0.019 87.000 -0.007 0.025 88.000 0.013 -0.017 89.000 -0.023 0.000 90.000 -0.077 0.024 91.000 -0.074 -0.013 92.000 -0.008 0.003 93.000 0.018 0.039 94.000 -0.009 0.008 95.000 -0.052 -0.091 96.000 0.040 -0.007 97.000 0.002 -0.057 98.000 -0.011 0.078 99.000 -0.045 0.103 100.000 0.004 0.146 101.000 0.112 -0.014 103.000 0.003 0.056 104.000 -0.000 0.102 105.000 -0.133 0.105 106.000 -0.028 0.112 107.000 0.110 0.026 108.000 0.003 0.010 109.000 -0.085 -0.098 110.000 -0.022 0.006 111.000 0.000 0.003 112.000 -0.026 -0.006 113.000 -0.025 0.014 114.000 0.022 0.005 115.000 0.001 0.002 116.000 0.037 0.002 117.000 0.000 -0.003 118.000 -0.021 0.051 119.000 -0.022 0.003 120.000 0.012 -0.003 121.000 0.008 -0.055 122.000 0.027 -0.005 123.000 -0.027 -0.018 124.000 0.001 0.009 125.000 0.007 -0.005 126.000 -0.012 0.024 127.000 0.006 0.005 128.000 0.030 0.011 129.000 -0.036 -0.006 130.000 -0.017 0.009 131.000 -0.017 0.004 132.000 -0.011 -0.008 133.000 -0.012 0.001 134.000 0.024 -0.033 135.000 0.023 0.020 136.000 0.009 -0.011 137.000 -0.005 0.025 138.000 0.002 0.047 139.000 0.023 0.019 140.000 -0.018 -0.024 141.000 0.046 -0.027 142.000 -0.010 0.007 143.000 -0.013 0.017 144.000 -0.037 0.012 145.000 -0.027 -0.031 147.000 0.071 0.018 148.000 0.035 0.002 149.000 -0.015 0.046 150.000 -0.022 0.093 151.000 -0.044 0.018 152.000 -0.053 0.016 153.000 -0.020 0.005 154.000 0.046 0.032 155.000 0.031 0.010 156.000 -0.036 0.012 157.000 -0.019 -0.011 158.000 -0.040 0.017 159.000 0.028 0.002 160.000 -0.010 0.004 161.000 -0.010 0.004 162.000 -0.041 0.013 163.000 -0.017 0.010 164.000 -0.010 -0.036 165.000 0.018 0.003 166.000 -0.013 0.005 167.000 0.041 0.023 168.000 -0.020 0.009 169.000 -0.011 0.025 170.000 0.026 -0.004 171.000 -0.006 -0.034 172.000 0.020 0.009 173.000 0.041 -0.026 175.000 -0.019 0.031 176.000 -0.022 0.008 177.000 0.015 0.034 178.000 -0.005 0.028 179.000 -0.054 -0.014 180.000 -0.016 0.049 181.000 0.060 0.087 182.000 0.077 0.037 183.000 -0.004 -0.001 184.000 0.035 0.049 185.000 -0.023 0.172 186.000 0.148 0.008 187.000 -0.019 0.011 188.000 0.012 0.025 189.000 0.013 -0.027 190.000 0.024 0.029 191.000 -0.008 0.029 192.000 -0.031 0.035 193.000 0.072 0.003 194.000 0.035 -0.035 195.000 0.018 0.046 196.000 0.060 0.010 197.000 -0.021 0.016 198.000 -0.016 -0.021 199.000 -0.007 0.011 200.000 0.204 -0.170 201.000 0.069 0.037 202.000 0.009 0.011 203.000 0.042 0.021 204.000 -0.009 0.006 205.000 -0.011 -0.003 206.000 0.004 0.003 207.000 0.016 0.020 208.000 0.046 0.012 209.000 0.079 0.027 210.000 -0.015 0.008 211.000 0.003 -0.013 212.000 0.007 0.005 213.000 -0.049 0.003 214.000 0.002 -0.029 215.000 -0.006 -0.008 216.000 -0.009 -0.045 217.000 0.014 -0.007 218.000 0.021 -0.016 219.000 0.011 -0.006 220.000 -0.040 0.013 221.000 0.020 -0.014 222.000 0.028 0.007 223.000 0.023 -0.030 224.000 0.029 0.029 Ladcp/Sadcp comparison, bottom track reference ============================================== Statistics of cast average 'highres' LADCP/SADCP velocity deviations, rsx2 var avg std min max n ----------------------------------------------------------------------------- du 0.00550092 0.0353187 -0.0739457 0.127404 66 dv 0.00756486 0.0379405 -0.0900775 0.147896 66 Statistics of all individual data points, highres LADCP/SADCP vel. deviations var avg std min max n ----------------------------------------------------------------------------- du 0.00590569 0.0446096 -0.164996 0.324858 2091 dv 0.00629534 0.0443741 -0.16376 0.208977 2091 Individual casts, depth average CAST du dv -------------------------- 3.000 0.127 -0.008 4.000 -0.015 0.065 5.000 0.022 0.000 6.000 0.025 0.039 7.000 0.043 0.086 8.000 0.007 0.088 9.000 0.003 0.048 10.000 -0.022 -0.009 11.000 0.048 -0.024 12.000 0.014 0.023 13.000 0.090 -0.065 14.000 -0.061 0.009 15.000 -0.001 -0.007 16.000 0.027 -0.030 17.000 0.008 0.024 18.000 0.012 -0.033 19.000 0.028 0.036 20.000 0.008 -0.021 21.000 0.000 0.006 22.000 0.049 -0.028 23.000 0.021 -0.014 24.000 -0.034 -0.005 26.000 -0.058 0.061 27.000 -0.019 0.003 28.000 0.022 -0.004 29.000 0.035 0.058 30.000 0.037 -0.009 31.000 0.019 0.009 32.000 0.012 0.019 33.000 0.037 -0.026 34.000 -0.016 0.093 35.000 -0.003 -0.011 36.000 -0.001 -0.024 37.000 -0.001 0.008 38.000 -0.001 0.014 39.000 0.098 0.010 40.000 -0.025 0.025 41.000 0.014 0.020 42.000 0.002 -0.032 43.000 -0.056 -0.012 44.000 0.014 0.148 45.000 -0.074 0.044 46.000 -0.015 0.018 48.000 -0.025 0.026 49.000 -0.035 -0.030 51.000 -0.014 -0.008 55.000 0.025 -0.018 56.000 0.024 0.009 57.000 0.004 0.008 58.000 0.011 0.004 59.000 0.005 0.016 60.000 -0.000 0.016 63.000 0.030 0.011 64.000 -0.011 -0.020 65.000 0.026 0.032 66.000 0.024 -0.035 67.000 0.006 0.014 68.000 0.018 -0.022 69.000 0.007 -0.009 70.000 0.006 0.051 71.000 -0.026 -0.090 73.000 -0.057 -0.027 74.000 0.019 -0.006 75.000 -0.002 0.003 78.000 -0.053 0.009 82.000 -0.039 -0.031