ASCN-II , LH2-00


Noise Levels at Different Periods

The table below gives the decibel 10% noise level (in db) for each month in several period bands. The 10% noise level is defined as the signal level not exceeded 10% of the time, based on hourly measurements. Each entry in the table is color coded with reference to the New Low Noise Model (NLNM, Peterson, 1993):
navy, -6 db < value-NLNM < -3 db
blue, -3 db < value-NLNM < 3 db
aqua, 3 db < value-NLNM < 6 db
lime, 6 db < value-NLNM < 9 db
yellow, 9 db < value-NLNM < 12 db
orange, 12 db < value-NLNM < 15 db
red, 15 db < value-NLNM < 20 db
fuchsia, 20 db < value-NLNM < 25 db
silver, value-NLNM < -6 db, value-NLNM > 25 db

Black indicates that there was an insufficient number of hourly measurements to calculate a noise level.

Noise levels (PSD) in decibels
Month Chan. Qual. # obs. 518s 439s 373s 316s 268s 228s 193s 164s 139s 118s 100s 85s 72s 61s 52s 44s 37s 32s 27s 23s 19s 16s 14s 12s 10s
202403 LH2-00 AR 626 -119 -121 -123 -126 -127 -128 -129 -130 -131 -132 -133 -134 -135 -136 -137 -139 -141 -142 -144 -146 -147 -146 -146 -146 -143
202402 LH2-00 AR 696 -115 -117 -119 -121 -122 -124 -125 -126 -127 -128 -130 -131 -132 -133 -134 -135 -136 -138 -140 -142 -143 -143 -145 -145 -141
202401 LH2-00 AR 744 -114 -116 -118 -119 -121 -122 -123 -124 -125 -126 -127 -128 -129 -130 -131 -133 -134 -136 -137 -139 -140 -142 -143 -143 -142
202312 LH2-00 AR 744 -114 -115 -116 -118 -119 -121 -122 -122 -123 -124 -126 -127 -128 -129 -130 -131 -133 -135 -136 -137 -139 -140 -142 -143 -143
202311 LH2-00 AR 673 -115 -116 -118 -118 -120 -121 -122 -123 -124 -125 -126 -128 -129 -131 -132 -133 -135 -136 -138 -140 -142 -143 -143 -143 -143
202310 LH2-00 AR 728 -114 -115 -116 -117 -118 -119 -120 -121 -123 -123 -125 -125 -127 -128 -129 -130 -131 -133 -134 -136 -137 -139 -140 -141 -142
202309 LH2-00 AR 713 -113 -114 -114 -115 -116 -117 -118 -120 -120 -122 -123 -124 -125 -126 -127 -129 -131 -132 -134 -135 -136 -138 -139 -140 -138
202308 LH2-00 AR 351 -114 -115 -116 -117 -118 -119 -120 -122 -123 -124 -126 -127 -128 -129 -130 -132 -133 -135 -137 -137 -139 -140 -141 -140 -140
202307 LH2-00 AR 744 -114 -115 -116 -117 -117 -117 -119 -119 -120 -120 -121 -123 -124 -124 -126 -127 -128 -130 -131 -133 -134 -136 -137 -138 -138
202306 LH2-00 AR 700 -114 -115 -117 -118 -120 -120 -121 -122 -123 -124 -125 -126 -127 -127 -129 -130 -132 -133 -134 -135 -136 -137 -139 -140 -140
202305 LH2-00 AR 426 -115 -117 -118 -120 -121 -122 -123 -124 -124 -125 -126 -127 -127 -128 -129 -130 -132 -133 -134 -136 -136 -138 -139 -140 -139
202304 LH2-00 AR 720 -115 -116 -117 -118 -119 -120 -121 -122 -123 -124 -125 -125 -126 -128 -129 -130 -131 -132 -134 -135 -137 -138 -139 -140 -140
202303 LH2-00 AR 705 -114 -115 -118 -119 -121 -122 -123 -124 -125 -126 -127 -128 -129 -130 -131 -132 -134 -135 -137 -138 -139 -141 -141 -142 -139
202302 LH2-00 AR 672 -113 -114 -115 -116 -117 -118 -119 -120 -121 -122 -122 -124 -124 -125 -126 -127 -128 -130 -131 -133 -134 -136 -137 -139 -140
202301 LH2-00 AR 685 -113 -114 -115 -117 -118 -119 -119 -120 -121 -122 -123 -124 -125 -126 -127 -128 -129 -131 -132 -133 -135 -137 -138 -140 -140
202212 LH2-00 AR 741 -113 -114 -115 -116 -117 -118 -119 -119 -121 -121 -123 -123 -125 -126 -127 -128 -130 -131 -132 -134 -136 -138 -139 -140 -140
202211 LH2-00 AR 720 -113 -114 -115 -116 -117 -118 -119 -119 -120 -121 -122 -123 -125 -125 -126 -128 -129 -130 -131 -133 -135 -136 -138 -139 -140
202210 LH2-00 AR 743 -113 -115 -115 -117 -117 -118 -120 -120 -121 -122 -123 -124 -125 -127 -128 -129 -130 -132 -134 -135 -137 -138 -140 -141 -141
202209 LH2-00 AR 619 -113 -114 -115 -116 -116 -118 -118 -120 -121 -121 -122 -123 -125 -126 -127 -128 -129 -131 -132 -134 -136 -137 -139 -139 -140
202208 LH2-00 AR 717 -113 -114 -115 -116 -117 -118 -119 -120 -121 -122 -123 -124 -125 -126 -128 -129 -130 -131 -132 -134 -135 -136 -137 -138 -138
202207 LH2-00 AR 683 -113 -114 -116 -117 -118 -120 -120 -121 -122 -122 -123 -124 -125 -125 -126 -127 -128 -129 -130 -132 -133 -135 -136 -138 -138
202206 LH2-00 AR 716 -113 -114 -115 -117 -119 -120 -121 -123 -125 -126 -128 -130 -131 -133 -135 -136 -138 -140 -141 -143 -145 -146 -146 -146 -146
202205 LH2-00 AR 742 -109 -111 -112 -114 -116 -118 -119 -121 -123 -125 -127 -128 -130 -132 -133 -134 -136 -137 -138 -140 -142 -143 -144 -145 -145
202204 LH2-00 AR 718 -109 -111 -112 -115 -116 -119 -120 -122 -124 -127 -128 -130 -131 -132 -134 -136 -137 -139 -140 -142 -144 -144 -145 -147 -144
202203 LH2-00 AR 744 -110 -110 -112 -113 -114 -117 -119 -121 -123 -124 -125 -127 -129 -130 -132 -133 -135 -136 -137 -139 -140 -142 -143 -144 -142
202202 LH2-00 AR 670 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202201 LH2-00 AR 739 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202112 LH2-00 AR 726 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202111 LH2-00 AR 513 -100 -99 -101 -101 -103 -103 -105 -107 -109 -110 -112 -114 -116 -118 -119 -120 -121 -123 -125 -127 -128 -130 -131 -132 -134
202110 LH2-00 AR 190 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202109 LH2-00 AR 275 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202108 LH2-00 AR 695 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202107 LH2-00 AR 742 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202106 LH2-00 AR 720 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202105 LH2-00 AR 744 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202104 LH2-00 AR 718 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202103 LH2-00 AR 743 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202102 LH2-00 AR 667 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202101 LH2-00 AR 674 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202012 LH2-00 AR 581 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202011 LH2-00 AR 717 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202010 LH2-00 AR 742 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202009 LH2-00 AR 715 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202008 LH2-00 AR 742 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202007 LH2-00 AR 740 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202006 LH2-00 AR 714 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202005 LH2-00 AR 744 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202004 LH2-00 AR 718 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202003 LH2-00 AR 744 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202002 LH2-00 AR 693 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
202001 LH2-00 AR 744 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
201912 LH2-00 AR 744 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
201911 LH2-00 AR 720 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
201910 LH2-00 AR 740 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
201909 LH2-00 AR 718 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
201908 LH2-00 AR 744 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
201907 LH2-00 AR 733 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
201906 LH2-00 AR 696 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
201905 LH2-00 AR 741 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
201904 LH2-00 AR 710 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10
201903 LH2-00 AR 741 -152 -153 -153 -155 -156 -158 -159 -160 -161 -162 -163 -164 -165 -166 -166 -167 -167 -167 -167 -166 -161 -155 -152 -149 -146
201902 LH2-00 AR 669 -154 -154 -154 -156 -157 -158 -159 -161 -162 -163 -164 -165 -166 -166 -167 -167 -168 -168 -168 -167 -160 -154 -152 -150 -145
201901 LH2-00 AR 743 -154 -154 -154 -156 -157 -158 -159 -160 -162 -162 -163 -164 -165 -166 -166 -167 -167 -167 -167 -166 -161 -155 -151 -148 -146
201812 LH2-00 AR 741 -153 -154 -154 -155 -156 -158 -159 -160 -161 -162 -163 -164 -165 -166 -166 -167 -167 -167 -167 -166 -161 -154 -150 -148 -146
201811 LH2-00 AR 708 -154 -154 -154 -155 -156 -158 -159 -160 -161 -162 -163 -164 -165 -166 -166 -166 -166 -167 -167 -166 -161 -154 -150 -147 -143
201810 LH2-00 AR 719 -154 -154 -155 -156 -157 -159 -160 -161 -162 -163 -164 -165 -165 -166 -167 -167 -168 -167 -168 -167 -162 -154 -151 -147 -144
201809 LH2-00 AR 716 -154 -154 -154 -155 -156 -157 -159 -160 -161 -162 -163 -164 -164 -165 -166 -166 -166 -166 -167 -166 -161 -154 -151 -147 -142
201808 LH2-00 AR 740 -152 -153 -152 -155 -156 -157 -158 -160 -161 -162 -163 -163 -164 -165 -165 -166 -166 -166 -166 -165 -160 -154 -150 -146 -141
201807 LH2-00 AR 737 -153 -153 -152 -155 -156 -158 -159 -160 -161 -162 -163 -164 -164 -165 -166 -166 -166 -167 -167 -165 -160 -155 -151 -146 -144
201806 LH2-00 AR 713 -152 -152 -152 -154 -155 -157 -158 -160 -161 -161 -163 -163 -164 -165 -166 -166 -166 -166 -166 -166 -161 -153 -151 -148 -145
201805 LH2-00 AR 741 -152 -153 -153 -154 -155 -157 -158 -159 -160 -162 -162 -163 -164 -165 -165 -166 -165 -165 -165 -165 -160 -154 -151 -148 -144
201804 LH2-00 AR 718 -153 -154 -154 -156 -157 -158 -159 -160 -161 -162 -163 -164 -165 -165 -166 -166 -166 -166 -166 -165 -160 -153 -148 -147 -143
201803 LH2-00 AR 737 -152 -153 -153 -155 -156 -157 -158 -159 -160 -161 -161 -162 -163 -163 -164 -164 -165 -165 -165 -164 -159 -153 -149 -147 -144
201802 LH2-00 AR 62 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999