www.igaco-o3.fi | Programme status | IGACO activities | Cluster B

19 Oct 2018

Activity Cluster B: Ozone at the Upper Troposphere and the Lower Stratosphere (UTLS)

Activity B1: Global UTLS monitoring approach

For global coverage for long-term UTLS ozone monitoring, a coherent approach is needed. This can be accomplished by designing a network integrating current and planned civil aircraft, ground-based (ozone sondes and LIDAR) and UTLS satellite measurements. Current commitments for space-based missions do not include instruments to continue the ozone profile estimates from occultation measurements. In addition, a concept for data quality should be developed making use of the different measurement platforms.

Originally planned tasks:

  • organize a workshop to discuss current capabilities and identify gaps
  • aim at developing a strategy to solve the problems
  • prepare assessment report with recommendations
Coordinator: IGACO-O3/UV

Status: On-going. Related activities ongoing: homogenization of ozone soundings and ESA CCI ozone.
Arranging a workshop together with SPARC planned in spring 2016 (include
in addition to ozone dynamics, water vapor, clouds, CO, ...)

Activity B2: Continue/augment ozonesonde network

High-resolution vertical profiles of ozone measured with ozone sondes support climate change studies (UTLS), development of environmental forecast models, satellite validation and ozone trend assessment. The goal of this task is increased knowledge of the magnitude of climate forcing from tropospheric ozone, improved performance of environmental prediction (pollution) models and accurate satellite-based ozone measurements by working on ensuring continuity of
high-quality ozone sonde measurements.

Originally planned tasks:

  • prepare a briefing note for the WMO Executive Council on the importance of ozonesonde flights and secure co-operation of the Permanent Representatives of meteorological services to continue existing operations or restore operations discontinued
  • maintain and improve quality assurance procedures at all stations
  • identify sites that would add significant new information to the global community (e.g. tropical and southern hemisphere sites)
Coordinator: O3-SAG

Status: Closed. Covered through WMO work.

Activity B3: Assimilation of ground-based ozone measurements

For the time being, only satellite-based ozone data are routinely used in data assimilation studies. The goal of this activity is to assess the added value and stand-alone value of ground-based vis--vis satellite ozone data for producing regularly gridded global ozone fields, and provide conclusions.

Originally planned tasks:

  • assimilation study using satellite AND Brewers & Dobsons
  • assimilation study using satellite AND lidar/sonde/mwr data
  • assimilation study using Brewers & Dobsons only
  • assimilation study using lidar/sonde/mwr data only
  • report
Coordinator: TBD

Status: Closed. Under the responsibility of ECMWF.
This is an on-going activity at ECMWF. Regional air quality models already assimilate some in-situ data.

Activity B4: Assimilation of tropospheric ozone measurements

The goal of this task is to assess the contribution of assimilation of tropospheric ozone measurements with air quality models to the accuracy of forecast and analysis. We also aim at augmenting surface ozone measurements with data assimilation in order to produce consistent surface ozone fields. As an additional activity, contribution of satellite-based tropospheric ozone data (as available) to air quality fields should be assessed.

Originally planned tasks:

  • set up data assimilation system for tropospheric ozone in air quality model
  • assess added value of observations

Status: Work on-going at ECMWF.
Both limb and nadir measurements are assimilated in the global model, which provide some constraint on tropospheric ozone.
Report 2013: Validation report of the MACC near-real time global atmospheric composition service.