netcdf shebaclouds.19971020.19981001 { dimensions: time = 50112 ; variables: float dtime(time) ; dtime:long_name = "Day number, decimal" ; dtime:comment = "Calculated from 1/1/1997" ; dtime:interval = "10-minute" ; short cldpresence(time) ; cldpresence:long_name = "Cloud presence" ; cldpresence:comment = "Cloud present if either radar or lidar measured a return" ; cldpresence:value = "0: No cloud; 1: Cloud; -1: Radar and Lidar inoperable" ; short oper_r(time) ; oper_r:long_name = "Radar operational" ; oper_r:value = "1: Radar was operational; -1: Radar was not operational" ; short oper_l(time) ; oper_l:long_name = "Lidar operational" ; oper_l:value = "1: Lidar was operational; -1: Lidar was not operational" ; float lb_b(time) ; lb_b:long_name = "Lowest cloud base height, best estimate" ; lb_b:comment1 = "Lidar base is used unless lidar was not operational" ; lb_b:comment2 = "When lidar inoperable, radar base may be biased low by precipitation" ; lb_b:units = "km AGL" ; float lb_bt(time) ; lb_bt:long_name = "Temperature at lowest cloud base height, best estimate" ; lb_bt:comment = "Sounding-interpolated temperature for best estimate lowest cloud base" ; lb_bt:units = "Degrees C" ; float lb_e(time) ; lb_e:long_name = "Lowest return height" ; lb_e:comment = "Lowest return height measured by radar or lidar" ; lb_e:units = "km AGL" ; float lb_et(time) ; lb_et:long_name = "Temperature at lowest return height" ; lb_et:comment = "Sounding-interpolated temperature for lowest return height" ; lb_et:units = "Degrees C" ; short lb_ei(time) ; lb_ei:long_name = "Lowest return height, instrument" ; lb_ei:comment = "Designates which instrument measured the lowest return height" ; lb_ei:value = "0: radar; 1: lidar; 2: both within 45m; -1: both inoperable" ; float lb_r(time) ; lb_r:long_name = "Lowest return height, radar" ; lb_r:comment = "Lowest return height measured by the radar" ; lb_r:units = "km AGL" ; float lb_l(time) ; lb_l:long_name = "Lowest return height, lidar" ; lb_l:comment = "Lowest return height measured by the lidar" ; lb_l:units = "km AGL" ; float ht_e(time) ; ht_e:long_name = "Highest return height (Highest cloud top, best estimate)" ; ht_e:comment = "Highest return height measured by radar and lidar" ; ht_e:units = "km AGL" ; float ht_et(time) ; ht_et:long_name = "Temperature at highest return height" ; ht_et:comments = "Sounding-interpolated highest return height temperature" ; ht_et:units = "Degrees C" ; short ht_ei(time) ; ht_ei:long_name = "Highest return height, instrument" ; ht_ei:comment = "Designates which instrument measured the highest return height" ; ht_ei:value = "0: radar; 1: lidar; 2: both within 45m; -1: both inoperable" ; float ht_r(time) ; ht_r:long_name = "Highest return height, radar" ; ht_r:comment = "Highest return measured by the radar" ; ht_r:units = "km AGL" ; float ht_l(time) ; ht_l:long_name = "Highest return height, lidar" ; ht_l:comment = "Highest return measured by the lidar" ; ht_l:units = "km AGL" ; float ct_r(time) ; ct_r:long_name = "Total cloud thickness, radar" ; ct_r:comment = "Total thickness of all return layers measured by the radar" ; ct_r:units = "km" ; float ct_l(time) ; ct_l:long_name = "Total cloud thickness, lidar" ; ct_l:comment = "Total thickness of all return layers measured by the lidar" ; ct_l:units = "km" ; short nl_m(time) ; nl_m:long_name = "Number of cloud layers" ; nl_m:comment = "The maximum number of cloud layers observed by radar or lidar" ; short nl_i(time) ; nl_i:long_name = "Number of cloud layers, instrument" ; nl_i:comment = "Designates which instrument saw the most number of cloud layers" ; nl_i:value = "0: radar; 1: lidar; 2: both same; -1: both inoperable" ; short nl_r(time) ; nl_r:long_name = "Number of cloud layers, radar" ; nl_r:comment = "May be biased low if layers are joined by precipitation" ; short nl_l(time) ; nl_l:long_name = "Number of cloud layers, lidar" ; nl_l:comment = "If lidar is attenuated it will miss any upper cloud layers" ; short liqpresent(time) ; liqpresent:long_name = "Liquid layer present" ; liqpresent:comment1 = "Designates whether there was an all- liquid layer in the vertical column" ; liqpresent:comment2 = "An all-liquid layer is defined as having a lidar depolarization ratio less than or equal to 0.11" ; liqpresent:value = "0: No liquid; 1: Liquid layer(s) present; -1: No lidar data" ; float liqheight(time) ; liqheight:long_name = "Height of lowest liquid layer" ; liqheight:comment = "Lowest height at which a liquid layer occurred (using 0.11 liquid layer definition)" ; liqheight:units = "km AGL" ; float liqtemp(time) ; liqtemp:long_name = "Temperature at height of lowest liquid layer" ; liqtemp:comment = "Sounding-interpolated liquid layer temperature (using 0.11 liquid layer definition)" ; liqtemp:units = "Degrees C" ; short atten(time) ; atten:long_name = "Lidar attenuated" ; atten:comment1 = "Attenuated if (radartop > 1km) and (radartop-lidartop > 200m)" ; atten:comment2 = "Attenuated if (radartop < 1km) and (radartop-lidartop > 80m)" ; atten:comment3 = "Not official definition of attenuation. May err on either side." ; atten:value = "0: Not attenuated; 1: Attenuated; -1: No lidar and/or radar data" ; short precip(time) ; precip:long_name = "Precipitation present" ; precip:comment1 = "Precipitation if (lidarbase-radarbase > 90m)" ; precip:comment2 = "Not official definition of precipitation. Instead describes when radar return extends significantly below lidar cloud base." ; precip:value = "0: No precipitation; 1: precipitation; -1: No lidar and/or radar data" ; // global attributes: :file_created = "November 1, 2000" ; :experiment = "Surface Heat Budget of the Arctic Ocean - SHEBA" ; :file_coverage = "October 20, 1997 - October 1, 1998" ; :file_description = "This file combines radar, lidar, and sounding measurements to give a comprehensive description of bulk cloud properties during SHEBA" ; :radar_platform = "Merged radar cloud boundaries from the MMCR (Uttal)" ; :lidar_platform = "Preliminary 10-min CLD files (layer averages) from DABUL (Intrieri)" ; :sounding_platform = "Rawinsonde text files (Moritz), interpolated to time-height grid" ; :radar_processing = "To degrade from 10-sec resolution, one radar beam is selected every 10 minutes" ; :flags = "Missing data values of -999 and -1 were used for floats and shorts, respectively" ; :note = "Any analysis utilizing these data should consider the times of operation for each instrument (oper_r and oper_l) and how they may influence statistics." ; :contact = "Matthew Shupe: matthew.shupe@noaa.gov, 303-497-6471" ; :organization = "NOAA, Environmental Technology Laboratory" ;