Workshop on convective clouds: ACRIDICON – CHUVA Campaign, May 20-22, 2014
São José dos Campos/SP – INPE – Brazil
Validation of trace gases products from Hyper Spectral Sounders
with in situ aircraft instruments: a cross-comparison among the
AIRS, IASI and CrIS
SCIENTIFIC INTEREST
VALIDATION
Exploit advanced hyper-spectral sounders, designed for weather applications, that
are either already in-orbit or planned for orbit:
"Radiances from
hyper spectral sounders are sensitive to
variations in airborne particulate matter and the concentration of
several minor gases. Retrieval algorithms have been developed
to produce important “research data products” including
atmospheric
profiles,
aerosol
optical
thickness
and
concentrations of minor gases, including ozone (O3), methane
(CH4), carbon monoxide (CO), and carbon dioxide (CO2). In this
way, our plan is to work with the validation of atmospheric
profiles and trace gases products from hyper spectral sounders
with in situ aircraft instruments. We are focused on satellite
programs based on infrared radiance measurements, such as
the Atmospheric Infrared Sounder (AIRS) on AQUA, the Crosstrack Infrared Sounder (CrIS) on the National Polar-orbiting
Operational Environmental Satellite System (NPOESS and NPP)
and the Infrared Atmospheric Sounding Interferometer (IASI) on
the
European
Meteorological
Satellite
(EUMETSAT)
Meteorological Operational (METOP). The results of this
validation will contribute with the update of the retrieval
algorithms.“
• Atmospheric Infrared Sounder (AIRS) aboard NASA’s Aqua satellite
• Infrared Atmospheric Sounding Interferometer (IASI) aboard EUMETSAT’s
METOP satellite
• Cross-track Infrared Sounder (CrIS) aboard NPP and NPOESS satellites
Atmospheric Infrared Hyper Spectral Sounders:
•Science: How can we extract meaningful information
about atmospheric concentrations of greenhouse gases?
•Benefit: Improve understanding of greenhouse gas
sources, transport, and climate feedbacks.
Thermal sounders, such as AIRS, IASI, and CrIS, measure traces in a
thick tropospheric column averages. The best in-situ validation products
are gas samples taken during aircraft flights.
TRACE GAS PRODUCT FROM OPERATIONAL THERMAL SOUNDERS
Gas
Range (cm-1)
Precision
Interfering Gases
H2O
1200-1600
15%
CH4, HNO3
H2O,emissivity
O3
1025-1050
10%
CO
2080-2200
15%
H2O,N2O
CH4
1250-1370
1.5%
H2O,HNO3,N2O
CO2
680-795
2375-2395
0.5%
H2O,O3
T(p)
Volcanic SO2
1340-1380
50% (?)
H2O,HNO3
HNO3
860-920
1320-1330
50% (?)
emissivity
H2O,CH4,N2O
N2O
1250-1315
2180-2250
2520-2600
5% (?)
H2O
H2O,CO
CHUVA - ACRIDICON: MISSION TYPES
In order to investigate these topics, five general types of flight
missions are proposed for ACRIDICON. All the missions are
performed in both clear and polluted conditions preferably under
comparable thermodynamic and also under contrasting
thermodynamic situations. The five missions are called:
1 Cloud vertical evolution and life cycle (cloud profiling);
2 Aerosol processing (in and outflow);
3 Satellite and Radar validation (cloud products);
4 Vertical transport and mixing (artificial tracer);
5 Clouds formed over forest/deforested areas in polluted/pristine
conditions.
Aqua, Terra, NPP, Metop and GOES-13 are satellites carrying
multispectral sensors, and the co-located airplane and satellite
data will make possible the intercomparison between ice/water,
particle size, penetrative clouds retrieval and measured.
SCIENCE TEAM
Contact:
Dr. Rodrigo Souza
[email protected]
German Team
Brazilian Team