Csiro atmospheric research technical paper

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Csiro atmospheric research technical paper

The AVHRR calibration uncertainty issue is very significant because it precludes any credible demonstration of multi-year trends in the behavior of the land surface.

Csiro atmospheric research technical paper

With uncertain calibration, there can be no monitoring - which is the principal application driving Task 4. This very valuable summary of published and unpublished calibration data supports the CAPS calibration module. Effectively, and perhaps unwisely, CSIRO is a passive user of critical parameters provided by others.

Calibration is the key to the quality and thus usefulness of the CATS output. It is critical that Task 4. The differences in the temporal behavior of gain are quite significant for long term trend detection. Which dataset, if either, is correct? Approach 3 is widely used and the uncertainties persist.

We have to do better! The inter-calibration approach 1 is constrained by the spectral mismatch between compared wavebands and because of data availability, is limited to the future and the afternoon spacecraft only. Approach 2surface reflectance measurement of selected inert sites with supporting atmospheric measurements, can be made with much less spectral mismatch between compared wavebands and has potential application both retrospectively and prospectively.

Csiro atmospheric research technical paper

This approach is appealing and is further strengthened by the additional consideration that follows. After calibration, atmospheric correction is the next largest source of uncertainty in interpreting surface behaviour using the AVHRR archive.

What is the most robust and efficient method of comparing surface- with satellite measurements - radiances or reflectances? Objectives Conduct a vicarious calibration of N14 AVHRR afternoon overpass using measurements of surface reflectance made at dark and bright sites nearby to Uardry.

Quantify the component and overall uncertainties of the calibration. Become familiar with the theory and practice of collecting and using atmospheric measurements to relate surface measurements to TOA satellite data.

We prefer to measure and work with reflectances rather than radiances. Using wide FOV degree diffusing optics for both irradiance and radiance measurements, the paired radiometers can simply be inter-calibrated before and after each measurement session.

This relative strategy is preferred to relying on the absolute calibration of any one radiometer. To maximize the robustness of the linear regression relationship between surface and satellite sensor data, we will measure the darkest and brightest sites of appropriate size and uniformity within 2 hours drive of Uardry.

We will locate these sites by processing a recent TM image. They are likely to be dark water bodies eg. Barren Box Swamp and bright overgrazed or cultivated red soils. We will spend all of Monday and Tuesday at Uardry doing a final inter-calibration of our radiometers and helping where we can with any other measurement efforts.

Help Wanted We seek help in three areas. The first is an overall criticism of our experimental objectives and methodology. If you have the time and patience, we would be grateful for your comments by phone, email, or the return of this document covered with your notes.CSIRO Atmospheric Research Technical Paper No.

65 5 performed by the SIBYL algorithms (Vaughan et al., ), while the task of autonomously selecting the calibration and analysis parameters for the individual sections of profile is.

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CSIRO Atmospheric Research Technical Papers. CSIRO Atmospheric Research Technical Papers are thoroughly reviewed reports that document significant scientific achievements such as model development and results from field observations.

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The CSIRO “Mk3 Climate System Model” documented in this technical report is part of CSIRO Atmospheric Research Technical Paper No. 60 3 Hunt (), and Hunt (a).

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