Changes between Version 1 and Version 2 of Ticket #232


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Timestamp:
2011-06-03T14:41:11Z (13 years ago)
Author:
Ian Culverwell
Comment:

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  • Ticket #232 – Description

    v1 v2  
    77This had little effect. So I artificially further reduced all the bgerr covs by a factor of 10 above 35km. The result is shown here: [[Image(Test2_reduced_bgerrcov.gif)]]
    88
    9 Clearly, much more reasonable temp changes.
     9Clearly, much more reasonable temp changes: < 0.3K.
    1010
    1111This is not to say that these are the ''correct'' bg err covs to use in this case; merely that a reasonable change in them can produce drastic change in the retrievals. In other words, this is a data issue, not a ROPP issue.
    1212
    13 Interestingly, the original temperature increment is much reduced (to ~3K) by using the non-default LevMarq minimiser, rather than the default minropp - see here: [[Image(Test2_levmarq.gif)]]
     13Interestingly, the original temperature increment is much reduced (to ~3K) by using the non-default !LevMarq minimiser, rather than the default !MinRopp - see here: [[Image(Test2_levmarq.gif)]]
    1414
    1515Again, it's resolved by reducing the bgerr covs at height:
    1616[[Image(Test2_levmarq_reduced_bgerrcov.gif)]]
    1717
     18So I suggest the root of the problem has been clarified.
    1819
    19