LABEL_REVISION_NOTE            = "
20141024, R. Achterberg Initial Version;"

RECORD_TYPE                   = STREAM

OBJECT                         = DATA_SET

  DATA_SET_ID                    = "CO-SA-CIRS-5-AEROS-V1.0"

  OBJECT                         = DATA_SET_INFORMATION

    DATA_SET_NAME                  = "
    CASSINI CIRS AEROSOL PROFILES V1.0"
    DATA_SET_COLLECTION_MEMBER_FLG = "N"
    START_TIME                     = 2005-08-22
    STOP_TIME                      = 2007-03-10
    DATA_SET_RELEASE_DATE          = 2014-10-24
    PRODUCER_FULL_NAME             = "DR. RICHARD ACHTERBERG"
    DETAILED_CATALOG_FLAG          = "N"
    ARCHIVE_STATUS                 = ""
    DATA_OBJECT_TYPE               = "TABLE"
    DATA_SET_TERSE_DESC            = "This data set contains Titan
    atmospheric temperature, aerosol and condensate ice profile retrievals
    from Cassini Composite Infrared Spectrometer limb observations."

    ABSTRACT_DESC            = "This data set comprises Titan atmosphere
    temperature, aerosol and ice profiles retrieved from limb viewing IR
    spectra from the Cassini Composite Infrared Spectrometer (CIRS)
    instrument."

    CITATION_DESC            = ""

    DATA_SET_DESC                  = "
        

Data Set Overview
=================

1.DATA
The aerosol and ice profiles presented here were retrieved from
CIRS Focal Plane 1 (FP1) spectra covering the range 50-550 cm-1,
with a spectral resolution of 15.5 cm-1.  The data are from 
far-IR limb scan observations, in which the single FP1 field of
view was slowly scanned vertically, providing roughly 350 spectra
distributed over an altitude range from the surface to approximately
600 km.  These scans are performed at a range of about 20,000 km,
giving a spatial resolution of about 140 km for the full width 
of the FP1 detector, although the ~2 to 3 km altitude difference
between successive spectra allows for a higher effective resolution
of the retrieved profiles.  From these observations, vertical
and spectral dependencies of the aerosol and a condensate ice 
were determined using the methods described in Anderson and Samuelson
(2011).

Temperatures above ~150 km were retrieved from CIRS focal plane 4 (FP4)
limb mapping observations taken near in time to the FP1 limb scans, 
using the nu4 absorption band of methane between 1270-1310 cm-1
as described in Achterberg et al. (2008). Temperatures at lower
altitudes were retrieved from the same FP1 limb spectra as the
aerosol and ice opacities using a constrained linear inversion 
procedure similar to that used for the FP4 retrievals, using the
spectra interval 70 - 150 cm-1 where the opacity is primarily from
collision induced absorption of N2-N2 and N2-CH4 pairs, and the
aerosols and condensate ice opacities derived by Anderson and
Samuelson (2011).


2. FORMAT OF THE FILES:  
For each FP1 limb scan, there are two resulting data files.  One
provides the retrieved spectral dependence of the aerosol and
ice absorption from 20 - 560 cm-1, both normalized to 1 at 100 cm-1.
The second file provides the vertical profiles of temperature in
K and the volume extinction coefficients in cm-1 for the aerosol
and condensate absorption at 100 cm-1.

The spectral dependence files contain three columns:
1. Wavenumber, in cm-1.
2. Wavenumber dependence of the volume extinction of the aerosol, scaled
to 1 at 100 cm-1.
3. Wavenumber dependence of the volume extinction of the ice, scaled
to 1 at 100 cm-1.

The vertical dependence files contain five columns:
1. Pressure, in mbar
2. Altitude, in km
3. Temperature, in K, used in the aerosol profile retrievals.
4. Volume extinction coefficient at 100 cm-1 for the aerosol.
5. Volume extinction coefficient at 100 cm-1 for the ice. 


REFERENCES

Achterberg, R. K. and 4 others, 2008.  Titan's middle-atmospheric
temperatures and dynamics observed by the Cassini Composite 
Infrared Spectrometer. Icarus, 194, 263-277.

Anderson, C. M. and R. E. Samuelson, 2011.  Titan's aerosol and
stratospheric ice opacities between 18 and 500 micrometers: Vertical
and spectral characteristics from Cassini CIRS. Icarus, 212, 762-768.


"

  END_OBJECT                     = DATA_SET_INFORMATION

  OBJECT                         = DATA_SET_REFERENCE_INFORMATION
    REFERENCE_KEY_ID             = "ACHTERBERG2008A"
  END_OBJECT                     = DATA_SET_REFERENCE_INFORMATION

  OBJECT                         = DATA_SET_REFERENCE_INFORMATION
    REFERENCE_KEY_ID             = "ANDERSON2011"
  END_OBJECT                     = DATA_SET_REFERENCE_INFORMATION

END_OBJECT                     = DATA_SET

END