At the ENVISAT symposium 2007 in Montreux a poster is presented with goals and status of ADAGUC
ADAGUC at EGU General Assembly 2007 in Vienna
Goals and current status of ADAGUC will be presented in an oral presentation
ADAGUC at National Geo Information Days in Rotterdam
ADAGUC presented 2 posters to the Dutch Geoinformation community in the former van Nelle factory in Rotterdam.
ADAGUC success in Geo-Connected
ADAGUC will receive an additional grant for a top-up project, dealing with climate and forecast data. The Geo-Connected tender has been issued by RGI to establish bridges between research programs.
Presentations workshop 2006 online
The presentations of the ADAGUC workshop are now online. You can access them
SCIAMACHY FRESCO+ Product
1.1. Product description
the retrieval of tropospheric trace gas columns it is essential to
have information on the cloud cover conditions. Both the cloud
fraction and the cloud pressure are needed as input for the trace gas
retrieval algorithms. With the FRESCO+ cloud algorithm, the
(effective) cloud fraction and cloud pressure are derived from GOME
and SCIAMACHY measurements.
influence the depth of absorption lines of a trace gas in the
spectrum, in particular if the trace gas concentration is high in the
troposphere. For the retrieval of tropospheric trace gas columns it
is therefore essential to have information on the cloud cover
FRESCO data set is used as input by many retrieval algorithms, for
example for the retrieval of ozone and NO2 (part of the use cases).
1.2. Time period of content
1.2.1. Time period of content
August 2002 – today.
1.2.2. Currentness reference
Actual time of observation.
1.3.2. Maintenance and update
1.4. Spatial Domain
1.4.1. Bounding coordinates
coverage: Longitude [-180,180], latitude [-90.,90.]
1.6. Access constraints
1.7. Use constraints
1.8. Point of contact
Ronald van der A, KNMI, email@example.com
1.9.2. Publication date
Figure 1. Cloud fraction as retrieved from SCIAMACHY
observations at 26 October 2008.
1.11. Data set credit
Ping Wang, Piet Stammes, Ronald van der A (KNMI).
1.12. Cross reference
and OMI cloud information (http://www.temis.nl).
Wang, P. Stammes, R. van der A, G. Pinardi, M. van Roozendael (2008),
FRESCO+: an improved O2 A-band cloud retrieval algorithm for
tropospheric trace gas retrievals, Atmospheric Chemistry and Physics
Discussions, 8, 9697-9729.
2. Data Quality
2.1.1. Source information
1 data (measured spectra) of SCIAMACHY.
220.127.116.11. Source citation
2.1.2. Processing steps
18.104.22.168. Processing description
The O2 A-band absorption is fitted using
pre-calculated look-up table to retrieve both cloud fraction and
22.214.171.124. Algorithms used
algorithm (Fortran code).
126.96.36.199. Ancillary data
climatology, elevation data.
188.8.131.52. Processing date
184.108.40.206. Data validation
error on cloud pressure is about 50 hPa and the error on cloud
fraction is about 0.05.