Table 1 Average conditions in the atmosphere (a) and during sizing of particles in the IAGOS-CARIBIC optical particle size spectrometer (OPSS).

From: Intercomparison of in-situ aircraft and satellite aerosol measurements in the stratosphere

Altitude above the tropopause (m)

300–1000

1000–2000

>2000

Conditions in the OPSS:

   pOPSS (hPa)a

331

326

315

   TOPSS (K)b

302

302

303

   RHOPSS (%)c

0.039

0.023

0.009

   wOPSS (%)d

88

90

93

Conditions in the atmosphere:

   pa (hPa)a

236

232

226

   Ta (K)b

219

220

223

   RHa (%)c

27

14

4

   wa (%)d

47

55

65

   Dg,v,a/Dg,v,OPSS e

1.23

1.18

1.12

  1. aPressure, btemperature, crelative humidity, dweight percent of H2SO4 in the H2SO4/H2O part of the particles, evolume geometrical mean diameter.
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