Post on 23-Feb-2016
description
M. De Mazière NDACC UVVIS July 2012
Demonstration Network Of ground-based Remote Sensing observations in support of the GMES Atmospheric Service
Coordinator: M. De MazièreBIRA-IASB
nors.aeronomie.be
M. De Mazière NDACC UVVIS July 2012
Context• European Initiative
Global Monitoring for Environment and Security (GMES) 6 thematic areas- atmosphere- land- ocean- security - emergencies- climate
Supported by ESA and EU since early 2000
M. De Mazière NDACC UVVIS July 2012
Context• A number of ESA and EU projects have been funded in preparation
of the operational GMES Atmosphere Service (GAS):
In particular the EU projects MACC and MACC-II : Monitoring Atmospheric Composition and Climate, is the
current pre-operational atmospheric service of the European GMES programme.
www.gmes-atmosphere.eu
MACC combines state-of-the-art atmospheric modelling with Earth observation data to provide information services covering European Air Quality, Global Atmospheric Composition, Climate, and UV and Solar Energy.
Overall Objective of NORSPerform the required research and developments to optimize the NDACC data and data products for the purpose of supporting the quality assessments of the future GAS.
M. De Mazière NDACC UVVIS July 2012
NORSNORS is a demonstration project• target NORS data products
• tropospheric and stratospheric ozone columns and vertical profiles up to 70 km altitude;
• tropospheric and stratospheric NO2 columns and profiles;
• lower tropospheric profiles of NO2, HCHO, aerosol extinction;
• tropospheric and stratospheric columns of CO• tropospheric and stratospheric columns of CH4
• 4 NDACC techniques: LIDAR, MW, FTIR, UV-VIS DOAS and MAXDOAS
• 4 NDACC pilot stations
M. De Mazière NDACC UVVIS July 2012
NORS pilot stations
3 out of 4 are also TCCON sites
Partners: BIRA-IASB, EMPA, INTA, UBern, KIT, CNRS, Ubremen, Ulg, MPIC, UH, S&T
M. De Mazière NDACC UVVIS July 2012
• Rapid data delivery to NDACC with a delay of maximum 1 month (WP3);
• Promote NORS data as validation data within GAS: provide an extensive characterisation of targeted NDACC data and user documentation (WP 4);
• to investigate the integration of ground-based data products from various sources (ground-based in-situ surface and remote-sensing data, and satellite data)
• to provide ground-based measurement time series back to 2003 in support of the re-analysis products of GAS.
NORS objectives
M. De Mazière NDACC UVVIS July 2012
NORS objectives
• to develop and implement a web-based application for validation of MACCII products using the NORS data products.
• Capacity building (WP 10): To ‘export’ project achievements to whole NDACC
community To support the extension of NDACC to stations
outside Western Europe, namely in the tropics, in China, Latin America, Africa and Eastern Europe
M. De Mazière NDACC UVVIS July 2012
Status of the NORS project• Start Nov. 1, 2011• Duration: 33 months• KO meeting, Brussels, Dec. 14, 2011• Already achieved:
• NORS website nors.aeronomie.be • Decision about data format: NORS sticks to GEOMS
data format• Rapid data delivery systems are set up• Data will be submitted to NDACC database, in a
separate directory for “NRT” data• User requirements are formulated for the NORS
validation server• Validation Server Design Document will be delivered
< July 10.• Good communication with the MACC-II project and
MACC-II VAL
M. De Mazière NDACC UVVIS July 2012
Overview validation server
Some things have to be decided by UVVIS WG
M. De Mazière NDACC UVVIS July 2012
Questions to this group• Related to URD
• Colocation criteria for ‘validation’ • Effective airmass location of a DOAS/MAXDOAS
observation• What exactly to compare ?• …..
• Related to WPs 3 and 4• Format issues and user guide of the data• Harmonisation and characterisation of products• Comparisons between UVVIS and FTIR data for
NO2 and HCHO• …..
M. De Mazière NDACC UVVIS July 2012
Invitation to this groupCf. WP10
All NDACC teams willing to contribute data to the data stream and the validation of the MACC-II products are welcome,
provided that data are submitted rapidly, in GEOMS HDF format and following the guidelines that will be discussed in this WG
once the system is up and running (month 18 – 21 of the project April – July 2013)
M. De Mazière NDACC UVVIS July 2012
M. De Mazière NDACC UVVIS July 2012
Description of the validation server• NORS target species: e.g. O3 total column at
LA.REUNION• MACC-II model: extract O3 data at LA.REUNION…
generated every 6hours• How to compare the data?
Time
6h
MACC output
1. temporal co-location measurements <-> model data
M. De Mazière NDACC UVVIS July 2012
• Choose a ‘characteristic time window’ for every NORS product.
Temporal co-location
Time
6h
MACC output
6h
•Window should not be bigger than 6h1 measurement -> 1 MACC output
•FTIR products choose windows = 6h
`
M. De Mazière NDACC UVVIS July 2012
• For every measurement, calculate the location of the effective airmass
• Interpolate the four surrounding MACC-II model data to this effective airmass location:
Spatial co-location
for every measurement -> a unique corresponding (interpolated) MACC data point.
M. De Mazière NDACC UVVIS July 2012
• The MACC-II data is smoothed with the averaging kernel of the NORS measurement
• Then statistics can be calculated (mean bias, modified normalized mean bias, …)
Comparison of columns
Vertical grid
M. De Mazière NDACC UVVIS July 2012
• The MACC-II data is smoothed with the averaging kernel of the NORS measurement
• To compare partial columns, regrid to a vertical grid on which the retrieved profile has about 1 DOF between two boundaries
Comparison of profiles
1 DOF• This grid will
depend on the instrument (and location). Every instrument should provide its `preferred’ vertical grid.
M. De Mazière NDACC UVVIS July 2012
Determine the unit DOF grid• Subgrid of grid in GEOMS data • v=diagonal vector of (averaged) averaging kernel
M. De Mazière NDACC UVVIS July 2012
Summarizing for FTIR
• For FTIR products: time between MACC outputs = 6h = characteristic time
• Calculation of effective airmass location with raytrace tool (based on fastcode) + interpolation
• Definition of the ‘preferred vertical grid’. For current NORS FTIR data providers: send the midpoint
heights and height indices tobavo.langerock@aeronomie.be
M. De Mazière NDACC UVVIS July 2012