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Submit DataData ReportingCommentsCategoryAerosolcoarse-mode-particle-size-distributionvnames    October 1, 2020
 
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VNAMES (OPC / APS specific columns)

Description:
These lines contain the titles of the dependent data columns, one each up to the total number specified in line 10. The titles of the dependent data columns (and thus the content type) are fixed for each instrument type. Except for numerical values indicating a wavelength or particle diameter, the titles should match the specification exactly to allow for column identification by string comparison.

All properties referring to a volume of air (such as a concentration) are to be stated for standard conditions of temperature and pressure (273.15 K, 1013.25 hPa). The temperature and pressure stated are the ones measured inside the instrument and included to allow to calculate the concentrations back to the original measurement conditions. The particle diameters indicated for each size bin are geometric means of lower and upper size limit of the bin. They are nominal ones determined following the instrument's SOP and assumptions on particle refractive index / density / shape indicated there. The number of size bins and the bin diameters are to be adjusted to the values provided by the instrument.

As measure of the atmospheric variability, the format includes not only the averages (arithmetic mean) of particle concentrations in each size bin for the hourly averaging period, but also the 15.87 and 84.13 percentiles . The hourly averages should preferably be based on about 60 values, i.e. minute averages of raw data. Especially in case of fewer values or poor coverage, it is recommended to interpolate between adjacent percentile values to calculate the specified percentiles.

Note: 
The percentiles were chosen because they correspond to average value plus one standard deviation and average value minus one standard deviation in case the data has a normal (Gaussian) probability distribution.

Syntax:

pressure, hPa, Location=instrument internal, Matrix=instrument
temperature, K, Location=instrument internal, Matrix=instrument
relative_humidity, %, Location=instrument internal, Matrix=instrument
number of size bins
particle_number_size_distribution, 1/cm3, D=<nominal particle diameter 1 in nm> nm, Measurement uncertainty=<estimated conc. uncertainty 1 in %>%
particle_number_size_distribution, 1/cm3, D=<nominal particle diameter 2 in nm> nm, Measurement uncertainty=<estimated conc. uncertainty 2 in %>%
particle_number_size_distribution, 1/cm3, D=<nominal particle diameter 3 in nm> nm, Measurement uncertainty=<estimated conc. uncertainty 3 in %>%

particle_number_size_distribution, 1/cm3, D=<nominal particle diameter 1 in nm> nm, Statistics=percentile:15.87, Measurement uncertainty=<estimated uncertainty of percentile 1 in %>%
particle_number_size_distribution, 1/cm3, D=<nominal particle diameter 2 in nm> nm, Statistics=percentile:15.87, Measurement uncertainty=<estimated uncertainty of percentile 2 in %>%
particle_number_size_distribution, 1/cm3, D=<nominal particle diameter 3 in nm> nm, Statistics=percentile:15.87, Measurement uncertainty=<estimated uncertainty of percentile 3 in %>%

particle_number_size_distribution, 1/cm3, D=<nominal particle diameter 1 in nm> nm, Statistics=percentile:84.13, Measurement uncertainty=<estimated uncertainty of percentile 1 in %>%
particle_number_size_distribution, 1/cm3, D=<nominal particle diameter 2 in nm> nm, Statistics=percentile:84.13, Measurement uncertainty=<estimated uncertainty of percentile 2 in %>%
particle_number_size_distribution, 1/cm3, D=<nominal particle diameter 3 in nm> nm, Statistics=percentile:84.13, Measurement uncertainty=<estimated uncertainty of percentile 3 in %>%


Example:
pressure, hPa, Location=instrument internal, Matrix=instrument
temperature, K, Location=instrument internal, Matrix=instrument
relative_humidity, %, Location=instrument internal, Matrix=instrument
number of size bins
particle_number_size_distribution, 1/cm3, D=265 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=290 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=324 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=374 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=424 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=474 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=539 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=614 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=675 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=748 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=894 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=1140 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=1442 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=1789 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=2236 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=2739 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=3240 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=3742 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=4472 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=5701 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=6982 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=7746 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=8944 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=11180 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=13693 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=16202 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=18708 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=22361 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=27386 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=30984 nm, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=265 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=290 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=324 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=374 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=424 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=474 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=539 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=614 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=675 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=748 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=894 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=1140 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=1442 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=1789 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=2236 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=2739 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=3240 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=3742 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=4472 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=5701 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=6982 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=7746 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=8944 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=11180 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=13693 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=16202 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=18708 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=22361 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=27386 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=30984 nm, Statistics=percentile:15.87, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=265 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=290 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=324 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=374 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=424 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=474 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=539 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=614 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=675 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=748 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=894 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=1140 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=1442 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=1789 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=2236 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=2739 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=3240 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=3742 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=4472 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=5701 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=6982 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=7746 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=8944 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=11180 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=13693 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=16202 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=18708 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=22361 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=27386 nm, Statistics=percentile:84.13, Measurement uncertainty=10%
particle_number_size_distribution, 1/cm3, D=30984 nm, Statistics=percentile:84.13, Measurement uncertainty=10%

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