Precursors for Aerosols and Ozone
ECV Products and Requirements
These products and requirements reflect the Implementation Plan 2022 (GCOS-244).
The requirements are found in the complete 2022 ECVs Requirements document as well: ECV Precursors for Aerosols and Ozone.
| Products | CO Tropospheric Column | CO Mole fraction | NO2 Mole Fraction | ||||
| (*) | Unit | Values | Values | Unit | Values | ||
| Horizontal Resolution | G | km | 10 | 10 | km | 20 | |
| B | 30 | 30 | 100 | ||||
| T | 100 | 100 | 500 | ||||
| Vertical Resolution | G | m | - | 1 | km | 1 | |
| B | - | 3 | 3 | ||||
| T | - | 5 | 5 | ||||
| Temporal Resolution | G | d | 1/24 | 1/24 | d | 1/4 | |
| B | 1 | 1 | 1 | ||||
| T | 30 | 30 | 30 | ||||
| Timeliness | G | d | 1 | 1 | d | 1 | |
| B | 7 | 7 | 7 | ||||
| T | 30 | 30 | 30 | ||||
| Required Measurement Uncertainty (2-sigma) | G | ppb | 1 | 1 | ppb | 20 | |
| B | 5 | 5 | 40 | ||||
| T | 10 | 10 | 60 | ||||
| Stability | G | ppb/decade | <1 | <1 | ppb/decade | 4 | |
| B | 1 | 1 | 8 | ||||
| T | 2 | 3 | 12 |
| Products | HCHO Tropospheric Column | SO2 Tropospheric Column | SO2 Stratospheric Column | NO2 Tropospheric Column | ||
| (*) | Unit | Values | Values | Values | Values | |
| Horizontal Resolution | G | km | 10 | 10 | 10 | 10 |
| B | 30 | 30 | 30 | 30 | ||
| T | 100 | 100 | 100 | 100 | ||
| Vertical Resolution | G | - | - | - | - | |
| B | - | - | - | - | ||
| T | - | - | - | - | ||
| Temporal Resolution | G | d | 1/24 | 1/24 | 1/24 | 1/24 |
| B | 1 | 1 | 1 | 1 | ||
| T | 30 | 30 | 30 | 30 | ||
| Timeliness | G | d | 1 | 1 | 1 | 1 |
| B | 7 | 7 | 7 | 7 | ||
| T | 30 | 30 | 30 | 30 | ||
| Required Measurement Uncertainty (2-sigma) | G | molecules cm-2 | max (20%, 8E15) | max (30%,6E15) | max(30%,6E15) | max(20%, 1E15) |
| B | max (40%,16E15) | max(60%, 12E15) | max(60%, 12E15) | max(40%, 2E15) | ||
| T | max (100%,40E15) | max(100%, 20E15) | max(100%, 20E15) | max(100%, 5E15) | ||
| Stability | G | molecules cm-2 / decade | max (4%, 8E15) | max(6%,1.2E15) | max(10%,3E15) | max(4%, 1E15) |
| B | max (8%,8E15) | max(12%, 2.4E15) | max(20%,4E15) | max(8%, 1E15) | ||
| T | max (20%,8E15) | max(20%, 4E15) | max(30%, 7E15) | max(20%, 1E15) |
(*) Goal (G): an ideal requirement above which further improvements are not necessary. Breakthrough (B): an intermediate level between threshold and goal which, if achieved, would result in a significant improvement for the targeted application. The breakthrough value may also indicate the level at which specified uses within climate monitoring become possible. It may be appropriate to have different breakthrough values for different uses. Threshold (T): the minimum requirement to be met to ensure that data are useful
Data sources
This list provides sources for openly accessible data sets with worldwide coverage for which metadata is available. It is curated by the respective GCOS ECV Steward(s). The list does not claim to be complete. Anyone with a suitable dataset who wishes it to be added to this list should contact the abombelli
wmo [dot] int (GCOS Secretariat).
In Situ and Ground-Based Remote Sensing:
- Earth System Research Laboratory Global Monitoring Division CO data
- Network for the Detection of Atmospheric Composition Change (NDACC)
- World Data Centre for Reactive Gases (WDCRG)
- National Aeronautics and Space Administration (NASA)
Reanalysis:
- REANALYSES.ORG (Inventory for Reanalysis)
- Copernicus Atmospheric Monitoring Service (CAMS), MACC Reanalysis of global atmospheric composition, European Centre for Medium-Range Weather Forecasts (ECMWF)
- Monitoring Atmospheric Composition & Climate (MACC), European Centre for Medium-Range Weather Forecasts (ECMWF)
Satellite:
