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Altri progetti: |
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BROADBAND
CLOUDs
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Nel codice BROADBAND, che
simula l'emissione atomsferica infrarossa in banda larga, sono
stati introdotti i calcoli dei parametri legati alle nubi per
la simulazione delle nubi stesse nelle misure di MIPAS.
I nuovi parametri sono il raggio delle particelle di H2O e ghiaccio,
la composizione percentuale in ghiaccio della nube, la particle
number density, la posizione in quota e coordinata orbitale
della nube.
Tramite l’identificazione degli spicchi di atmosfera nuvolosi,
per ogni linea di vista dello strumento che li attraversa vengono
calcolati i parametri legati alle nubi.
Per far questo, è stata integrata nel codice del BROADBAND
una subroutine che produce i valori delle cross section di scattering
ed emissione e dell’integrale di scattering utilizzando
la teoria dello scattering di Mie per particelle sferiche.
Per il calcolo dell’integrale di scattering è stato
necessario implementare un modello di trasferimento radiativo
in atmosfera curva senza rifrazione che permette il calcolo
della radiazione per i diversi angoli di incidenza che circondano
la nube.
I valori di Cext, Cabs e l’integrale di scattering così
ottenuti sono, poi, stati integrati nell’equazione di
trasferimento radiativo per cielo sereno già esistente
nel codice.
La validazione delle nuove funzionalità del BROADBAND
e' stata ottenuta confrontando con i risultati ottenuti con
quelli dei codici ARTS e KOPRA per spettri ottenuti con diversi
scenari di nube.
si veda anche il poster
presentato ad ASSFTS 2009
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SAFIRE
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SAFIRE-A (Spectroscopy of the Atmosphere using Far InfraRed
Emission—Airborne) is a high-resolution Fourier transform
spectrometer that performs limb sounding observations of atmospheric
emission in the Far-Infrared spectral region, for the measurement
of volume mixing ratio profiles of several stratospheric constituents.
The instrument was integrated onboard the high-flying research
aircraft M55 Geophysica within the framework of the Airborne
Polar Experiment (APE).
SAFIRE-A observes the atmospheric spectrum with high spectral
resolution through the farinfrared, where many of the trace
gases, playing a major role in atmospheric chemistry, have
important emission features. A scientific code for the routine
analysis of the middle infrared emission spectra measured
by SAFIRE-A (the Retrieval Algorithm for SAFIRE-RAS), was
initially developed by Dr B.M.Dinelli. The objective for which
SAFIRE-A and RAS were developed is to perform the measurement
of the volume mixing ratio profiles of H2O, O3, HNO3, N2O,
ClO, HCl and H2O.
SAFIRE-A has been involved in field campaigns carried out
with the M-55 Geophysica stratospheric aircraft in 2002-2003,
aimed at validating the level-2 products of the ENVISAT chemistry
instruments. The limb sounding observations of volume mixing
ratio vertical profiles of Ozone and Nitric Acid were especially
focused on the validation of MIPAS products in the altitude
range 10-20 km. MORE
The SAFIRE-A instrument has been deployed on the M-55 Geophysica
high altitude aircraft in several scientific campaigns carried
out, between the end of 1999 and the beginning of 2003, at
mid-latitudes as well as in the Polar regions (both Arctic
and Antarctica). MORE
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IBEX
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The IBEX (Infrared Balloon Experiment,
Istituto di Fisica Applicata “Nello Carrara”, IFAC-CNR,
Firenze, Italy) is a far-infrared Fourier transform spectrometer,
which was flown during the first campaign of ESABC from Sicily
over the Mediterranean to Spain on 28-29 July 2002. The nstrument
launch, scheduled for the 22nd July in coincidence with Geophysika
flight and Envisat overpasses, was delayed until the 29th July;
no significant overpasses were expected on that day, but the
end of launch campaign did not allow any other choice.The launch
was made from the Italian Space Agency base (Trapani, Sicily)
and ended over Sierra Nevada (Spain) after 20 hours. Float altitude
during measurements was in the 37-38 km range.
Data used for the retrieval are those from
the on board data recorder. Data processing followed the standard
procedure (cleaning from spikes, phase correction, Fourier transform,
spectra calibration).
Vertical profiles retrieval has been done using the same package
used for the SAFIRE-A instrument.
While being made ready for its coming back
from Spain to Italy the IBEX instrument went on fire, so these
results may be really considered its 'final words' . |
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ISAC - CNR
Gruppo: Remote Sensing of the Stratosphere
Via P. Gobetti, 101
40129 Bologna
ITALY
Tel.+39 051 6398002
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