Puijo SMEAR IV Kuopio Particle size distribution (DMPS), interstitial inlet (SmartSMEAR)

Abstract

Particle size distribution data measured with a differential mobility particle sizer (DMPS) through an interstitial (int) inlet at Puijo SMEAR IV station in Kuopio, Finland. Data stored in CSC “smear” database, “PUI_dmps_int” table. It includes the following variables (valiable_name: description; [unit]):

* samptime: Sample time (UTC +2); [yyyy-mm-dd HH:MM:SS] * mtime: Time in Matlab time number (UTC+2); [] * quality: Quality parameter; [] * sizerange_id: Size range ID (diamaters in PUI_dmps_sizeranges); [] * ntot: Total particle concentration ; [#/cm3] * ch01: Particle concentration dN/dlogDp Ch01; [#/cm3] * ch02: Particle concentration dN/dlogDp Ch02; [#/cm3] * ch03: Particle concentration dN/dlogDp Ch03; [#/cm3] * ch04: Particle concentration dN/dlogDp Ch04; [#/cm3] * ch05: Particle concentration dN/dlogDp Ch05; [#/cm3] * ch06: Particle concentration dN/dlogDp Ch06; [#/cm3] * ch07: Particle concentration dN/dlogDp Ch07; [#/cm3] * ch08: Particle concentration dN/dlogDp Ch08; [#/cm3] * ch09: Particle concentration dN/dlogDp Ch09; [#/cm3] * ch10: Particle concentration dN/dlogDp Ch10; [#/cm3] * ch11: Particle concentration dN/dlogDp Ch11; [#/cm3] * ch12: Particle concentration dN/dlogDp Ch12; [#/cm3] * ch13: Particle concentration dN/dlogDp Ch13; [#/cm3] * ch14: Particle concentration dN/dlogDp Ch14; [#/cm3] * ch15: Particle concentration dN/dlogDp Ch15; [#/cm3] * ch16: Particle concentration dN/dlogDp Ch16; [#/cm3] * ch17: Particle concentration dN/dlogDp Ch17; [#/cm3] * ch18: Particle concentration dN/dlogDp Ch18; [#/cm3] * ch19: Particle concentration dN/dlogDp Ch19; [#/cm3] * ch20: Particle concentration dN/dlogDp Ch20; [#/cm3] * ch21: Particle concentration dN/dlogDp Ch21; [#/cm3] * ch22: Particle concentration dN/dlogDp Ch22; [#/cm3] * ch23: Particle concentration dN/dlogDp Ch23; [#/cm3] * ch24: Particle concentration dN/dlogDp Ch24; [#/cm3] * ch25: Particle concentration dN/dlogDp Ch25; [#/cm3] * ch26: Particle concentration dN/dlogDp Ch26; [#/cm3] * ch27: Particle concentration dN/dlogDp Ch27; [#/cm3] * ch28: Particle concentration dN/dlogDp Ch28; [#/cm3] * ch29: Particle concentration dN/dlogDp Ch29; [#/cm3] * ch30: Particle concentration dN/dlogDp Ch30; [#/cm3] * ch31: Particle concentration dN/dlogDp Ch31; [#/cm3] * ch32: Particle concentration dN/dlogDp Ch32; [#/cm3] * ch33: Particle concentration dN/dlogDp Ch33; [#/cm3] * ch34: Particle concentration dN/dlogDp Ch34; [#/cm3] * ch35: Particle concentration dN/dlogDp Ch35; [#/cm3] * ch36: Particle concentration dN/dlogDp Ch36; [#/cm3] * ch37: Particle concentration dN/dlogDp Ch37; [#/cm3] * ch38: Particle concentration dN/dlogDp Ch38; [#/cm3] * ch39: Particle concentration dN/dlogDp Ch39; [#/cm3] * ch40: Particle concentration dN/dlogDp Ch40; [#/cm3]

Webpage for the data: https://avaa.tdata.fi/web/smart/smear.

Open API query for the data (e.g. year 2006): https://avaa.tdata.fi/smear-services/smeardata.jsp?table=PUI_dmps_tot&from=2006-01-01+00:00:00.000&to=2006-12-31+23:59:59.999&quality=ANY&averaging=NONE&type=NONE&variables=mtime,quality,sizerange_id,ntot,ch01,ch02,ch03,ch04,ch05,ch06,ch07,ch08,ch09,ch10,ch11,ch12,ch13,ch14,ch15,ch16,ch17,ch18,ch19,ch20,ch21,ch22,ch23,ch24,ch25,ch26,ch27,ch28,ch29,ch30,ch31,ch32,ch33,ch34,ch35,ch36,ch37,ch38,ch39,ch40

Size distributions have been measured using different diameter ranges at different periods:

1. from 10 to 500 nm, 30 channels, 2.6.2006 - 31.3.2007 2. from 7 to 800 nm, 40 channels, 1.4.2007 - 31.1.2012 3. from 3 to 800 nm, 40 channels, from 1.2.2012

Particle diameters for different size bins were stored in “PUI_dmps_sizeranges” table. Variable “sizerange_id” in PUI_dmps_int/tot tables tells which size range should be used. Particle diameters can be fetched by API query (id=n, n is number of the size range period): https://avaa.tdata.fi/smart-smear-portlet/PUI_dmps_sizeranges.jsp?id=3

Interstitial (int) and total (tot) inlets:

Sample air for the instruments is drawn through two parallel sampling lines: interstitial (int) and total (tot) inlets:

* interstitial inlet (int) is equipped with an impactor with a 10-µm cut-off size followed by a cyclone with a 1.0-µm cut-off size (2.5 µm before 20 November 2009) * total air inlet (total) with heated sampling lines and snow-hood to dry the cloud droplets (cut-off size 40 µm when the wind speed is below 20 m/s)

This two-inlet setup enables simultaneous interstitial and total air (interstitial + cloud drop residual) measurements when the tower is covered by clouds.

The size of data: ca. 12 MB/year, totally ca. 120 MB.