STREAM

Feb 9 -14, 1995
Nov 23 - Dec 3, 1995
May 22 - Jun 1, 1996
Mar 9 - 25, 1997
Jun 27 - Jul 24, 1998

Official STREAM homepage (Campaigns until 1996)

Brief description

The STREAM programme (Stratosphere-Troposphere Experiment by Aircraft Measurements) began in 1993 with the STREAM-I Winter campaign which took place from Kiruna (Sweden) during February 1993. The aim of this research was to develop an airborne measurement programme including detection of trace gases and aerosols to improve our understanding of the chemistry and dynamic processes in the tropopause region. This was encouraged by the importance of this part of the atmosphere for the antropogenic radiative forcing and the observed ozone trends, the need to validate chemistry models and the recognition of a lack of small scale in-situ data of ozone and its precursors.

The STREAM project combines in situ observations through aircraft measurements with modelling studies. The observational part of the work provides a basis for process studies and model validation.

STREAM-I has been followed up by the STREAM-II campaign (1994-1995) which existed of a Summer campaign conducted from Amsterdam to study stratosphere-troposphere exchange processes and a Winter campaign which took place from Kiruna, Sweden to study polar stratospheric ozone chemistry.

The STREAM-III programm resulted in a polar stratospheric Winter campaign which took place during March 1996 from Kiruna, Sweden and involved a Summer campaign conducted from Timmins, Ontario (Canada) in June/July 1998 focussing on the chemical effects in the tropopause region of emissions from large scale biomass burning in Northern Canada.

The STREAM projects were EC-funded and coordinated by Prof. Jos Lelieveld and colleagues at the Institute for Marine and Atmospheric research Utrecht (IMAU), at the Faculty of Physics and Astronomy of the Utrecht University.

Special remarks concerning ETHmeg database content

none

Overview of measurement techniques and uncertainties

References