netcdf enaaosccn2colaavgC1.b1.20240501.000708 { dimensions: time = UNLIMITED ; // (118 currently) droplet_size = 20 ; setpoint = 7 ; bound = 2 ; variables: int base_time ; base_time:string = "2024-05-01 00:00:00 0:00" ; base_time:long_name = "Base time in Epoch" ; base_time:units = "seconds since 1970-1-1 0:00:00 0:00" ; base_time:ancillary_variables = "time_offset" ; double time_offset(time) ; time_offset:long_name = "Time offset from base_time" ; time_offset:units = "seconds since 2024-05-01 00:00:00 0:00" ; time_offset:ancillary_variables = "base_time" ; double time(time) ; time:long_name = "Time offset from midnight" ; time:units = "seconds since 2024-05-01 00:00:00 0:00" ; time:standard_name = "time" ; time:bounds = "time_bounds" ; double time_bounds(time, bound) ; time_bounds:long_name = "Time cell bounds" ; float droplet_size(droplet_size) ; droplet_size:long_name = "Size bins for CCN droplets" ; droplet_size:units = "um" ; droplet_size:bounds = "droplet_size_bounds" ; float droplet_size_bounds(droplet_size, bound) ; droplet_size_bounds:long_name = "Droplet bin bounds" ; float setpoint(setpoint) ; setpoint:long_name = "Supersaturation set point values" ; setpoint:units = "%" ; float Q_sample(time) ; Q_sample:long_name = "Volumetric flowrate of sample air" ; Q_sample:units = "cm^3/min" ; Q_sample:comment = "This flow is 1/10 of the total flow to the instrument and carries the particles to the column of the instrument. The sample flow is used to calculate the N_CCN concentration." ; Q_sample:flow_type = "volumetric" ; Q_sample:reference_conditions = "ambient conditions" ; Q_sample:missing_value = -9999.f ; float overflow(time) ; overflow:long_name = "Number of particles that are larger than 10um" ; overflow:units = "count" ; overflow:missing_value = -9999.f ; float supersaturation_calculated(time) ; supersaturation_calculated:long_name = "Mean calculated supersaturation values for a fixed supersaturation set point." ; supersaturation_calculated:units = "%" ; supersaturation_calculated:comment = "The supersaturation_calculated values in this average match the times selected for the mean N_CCN." ; supersaturation_calculated:missing_value = -9999.f ; float aerosol_number_concentration(time) ; aerosol_number_concentration:long_name = "Aerosol particle number concentration" ; aerosol_number_concentration:units = "1/cm^3" ; aerosol_number_concentration:comment = "This field uses CPC data that provides the concentration of particles.The CPC values corresponding to N_CCN data from 25 to 75% (obtained during N_CCN_mean_interquartile calculation) are averaged. This field is used to plot the f_CCN spectra or the activated fraction of particles." ; aerosol_number_concentration:missing_value = -9999.f ; float N_CCN(time) ; N_CCN:long_name = "Mean number concentration of activated condensation nuclei" ; N_CCN:units = "1/cm^3" ; N_CCN:standard_name = "number_concentration_of_ambient_aerosol_particles_in_air" ; N_CCN:comment = "The droplets from the bins lower than \'first_bin_used\' are excluded, and N_CCN is recomputed. The equation used is: ([sum of droplets from each bin >= first_bin_used + overflow] / Q_sample ) * 60. This field contains the robust averaged value termed the \"inner quartile\" of N_CCN values obtained at fixed supersaturation setpoints passing all QC tests. The \"inner quartile\" consists of the central portion of the data values remaining after excluding the top and bottom 1/4 of the values." ; N_CCN:reference = "ambient conditions" ; N_CCN:missing_value = -9999.f ; N_CCN:ancillary_variables = "qc_N_CCN" ; int qc_N_CCN(time) ; qc_N_CCN:long_name = "Quality check results on field: Mean number concentration of activated condensation nuclei" ; qc_N_CCN:units = "1" ; qc_N_CCN:description = "This field contains bit packed integer values, where each bit represents a QC test on the data. Non-zero bits indicate the QC condition given in the description for those bits; a value of 0 (no bits set) indicates the data has not failed any QC tests." ; qc_N_CCN:flag_method = "bit" ; qc_N_CCN:bit_1_description = "Value is equal to missing_value." ; qc_N_CCN:bit_1_assessment = "Bad" ; qc_N_CCN:bit_2_description = "((N_CCN - N_CCN_reduced) / N_CCN) > 20" ; qc_N_CCN:bit_2_assessment = "Indeterminate" ; float N_CCN_dN(time, droplet_size) ; N_CCN_dN:long_name = "Droplet count by bin size" ; N_CCN_dN:units = "count/s" ; N_CCN_dN:comment = "The number droplets per bin (dN) corresponding to N_CCN data from 25 to 75% (obtained during N_CCN_mean_interquartile calculation) are averaged. This field produces one droplet size distribution per supersaturation value and is used to calculate the N_CCN concentration based on dN." ; N_CCN_dN:comment1 = "Each bin contains a droplet count, based on droplet size" ; N_CCN_dN:reference = "ambient conditions" ; N_CCN_dN:missing_value = -9999.f ; int first_bin_used(time) ; first_bin_used:long_name = "First bin used in N_CCN_reduced calculation." ; first_bin_used:units = "1" ; first_bin_used:comment = "In order to exclude counts due to small non-nucleated particles, the values of bins in N_CCN_dN are scanned for the first non-decreasing value. This is the first_bin_used value used to compute N_CCN_reduced." ; first_bin_used:missing_value = -9999 ; float lat ; lat:long_name = "North latitude" ; lat:units = "degree_N" ; lat:valid_min = -90.f ; lat:valid_max = 90.f ; lat:standard_name = "latitude" ; float lon ; lon:long_name = "East longitude" ; lon:units = "degree_E" ; lon:valid_min = -180.f ; lon:valid_max = 180.f ; lon:standard_name = "longitude" ; float alt ; alt:long_name = "Altitude above mean sea level" ; alt:units = "m" ; alt:standard_name = "altitude" ; // global attributes: :command_line = "aosccn200corr -s ena -f C1" ; :Conventions = "ARM-1.2" ; :process_version = "ingest-aosccn200corr-2.7-0.el7" ; :dod_version = "aosccn2colaavg-b1-1.4" ; :site_id = "ena" ; :facility_id = "C1" ; :platform_id = "aosccn2colaavg" ; :data_level = "b1" ; :location_description = "Eastern North Atlantic (ENA), Graciosa Island, Azores" ; :datastream = "enaaosccn2colaavgC1.b1" ; :input_datastreams = "enaaosccn200C1.a1 : 1.5 : 20240501.000000-20240502.000000\n", "enaaoscpcfC1.b1 : 2.7 : 20240430.000000-20240502.000000" ; :configuration_file = "enaaosccn2colaC1.20201001.000000.config" ; :sampling_interval = "1 second" ; :averaging_interval = "1 minute" ; :Instrument = "CCN-200" ; :Instrument_Manufacturer = "Droplet Measurement Technologies" ; :AOS_DAC_type = "D" ; :doi = "10.5439/1323894" ; :history = "created by user dsmgr on machine prod-proc2.adc.arm.gov at 2024-05-01 05:15:01, using ingest-aosccn200corr-2.7-0.el7" ; }