Search for OClO signatures from Odin limb radiance measurements using DOAS technique

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An Optical Instrument for STEAM
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An Optical Instrument for STEAM
CHAOS Cloud Height, Aerosol and Ozone Sensor
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Optical Measurements The Odin
Heritage Instrument Design
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The Need for Optical Measurements
Support of the major scientific goal Exchange
processes and climate effects in the UT/LS
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The Need for Optical Measurements

• Support of the microwave retrievals
• Cloud influences on the radiative transfer

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The Need for Optical Measurements

• Complementary data
• Thin clouds in the UT/LS
• Stratospheric aerosol
• Ozone and water in the UT/LS

Winker and Trepte, 1998
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Thin Clouds in the UT/LS
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Thomas et al., 2002
Thin Clouds in the UT/LS
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Thomas et al., 2002
Thin Clouds in the UT/LS
Thomas et al., 2002
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Thomas et al., 2002
Thin Clouds in the UT/LS
Sub-visible cirrus clouds
Ultrathin tropical tropopause clouds (UTTC)
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Thomas et al., 2002
Thin Clouds in the UT/LS

• What are their physical properties ?
• What is their temporal and geographic
  distribution ?

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Thomas et al., 2002
Thin Clouds in the UT/LS

• What are their physical properties ?
• What is their temporal and geographic
  distribution ?
• What is their net effect on the Earths
  radiation budget ?
• What is their effect on troposphere/stratosphere
  water transport ?

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Thomas et al., 2002
Thin Clouds in the UT/LS

• What are their physical properties ?
• What is their temporal and geographic
  distribution ?
• What is their net effect on the Earths
  radiation budget ?
• What is their effect on troposphere/stratosphere
  water transport ?
• Do they give rise to heterogeneous chemistry ?

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Measurement Objectives

• vertical resolution of 0.1-0.2 km
• cloud optical depth down to 10-4
• spectral coverage in visible and near-IR
• polarisation measurement useful
• see down to below 10 km

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The Instrument...
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Odin Heritage
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Odin Heritage
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Odin Heritage
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Odin Heritage
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What does OSIRIS give us ?
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tomography
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Stratospheric Aerosol Extinction at 1.53 ?m
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UT/LS cloud detection frequency (17-20 km), April
2002
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Towards STEAM...
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Odin
Tangent altitude for unit optical depth
(molecular scattering).
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STEAM
Odin
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STEAM
Odin
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STEAM
Odin
limb camera
5 discrete channels
3 channels
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Instrument Components
Infrared Imagers (1.27 ?m, 1.36 ?m, 1.53 ?m)
Vis/Near-IR Imaging Spectrograph(450-500 nm,
600-900 nm) Near-IR limb camera(850 nm)
5 discrete channels
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Instrument Components
Infrared Imagers (1.27 ?m, 1.36 ?m, 1.53 ?m)
Vis/Near-IR Imaging Spectrograph(450-500 nm,
600-900 nm) Near-IR limb camera(850 nm)
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Instrument Components
Infrared Imagers (1.27 ?m, 1.36 ?m, 1.53 ?m)
Vis/Near-IR Imaging Spectrograph(450-500 nm,
600-900 nm) Near-IR limb camera(850 nm)
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Instrument Components
Infrared Imagers (1.27 ?m, 1.36 ?m, 1.53 ?m)
Vis/Near-IR Imaging Spectrograph(450-500 nm,
600-900 nm) Near-IR limb camera(850 nm)
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Instrument Components
Infrared Imagers (1.27 ?m, 1.36 ?m, 1.53 ?m)
Vis/Near-IR Imaging Spectrograph(450-500 nm,
600-900 nm) Near-IR limb camera(850 nm)
Optical Cloud Monitor (OCM) Limb-viewing CCD
camera, based on design for Marschals by RAL
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Measurements
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Measurements
Infrared Imagers (1.27 ?m, 1.36 ?m, 1.53 ?m)
Vis/Near-IR Imaging Spectrograph(450-500 nm,
600-900 nm) Near-IR limb camera(850 nm)
cloud layers, cloud top heights, tomography
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Measurements
Infrared Imagers (1.27 ?m, 1.36 ?m, 1.53 ?m)
Vis/Near-IR Imaging Spectrograph(450-500 nm,
600-900 nm) Near-IR limb camera(850 nm)
cloud and aerosolspectral characterisation
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Measurements
Infrared Imagers (1.27 ?m, 1.36 ?m, 1.53 ?m)
Vis/Near-IR Imaging Spectrograph(450-500 nm,
600-900 nm) Near-IR limb camera(850 nm)
UT/LS ozone profiles(3-wavelengths Flittner
method,tomography)
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Measurements
Infrared Imagers (1.27 ?m, 1.36 ?m, 1.53 ?m)
Vis/Near-IR Imaging Spectrograph(450-500 nm,
600-900 nm) Near-IR limb camera(850 nm)
UT/LS water vapour profile (1.36 ?m absorption
band)
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Measurements
Infrared Imagers (1.27 ?m, 1.36 ?m, 1.53 ?m)
Vis/Near-IR Imaging Spectrograph(450-500 nm,
600-900 nm) Near-IR limb camera(850 nm)
popular pictures of UT/LS clouds and the
Earths limb
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Summary
The STEAM optical instrument performs
limb-imaging measurements between 450 nm and 1.53
?m. It is strongly based on the heritage from
Odin/OSIRIS. Data products will support and
complement the microwave measurements in
the UT/LS

• tropospheric cloudiness and cloud top heights
• thin cloud layers and cloud properties
• ozone distribution
• water vapour distribution

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Thanks !