2 Comments

  1. Bruce foutch
    November 30, 2008,

    Mr. Briggs,

    I have a question that is OT.

    On Cryosphere Today, they chart the 1979-to-date data against a 1979-2000 mean. Is this a correct way to use a mean, considering that we are now at the end of 2008? Should the mean be recomputed as each day goes by to keep it up-to-date?

    http://arctic.atmos.uiuc.edu/cryosphere/

    Thank you,
    Bruce

  2. Briggs
    December 1, 2008,

    Bruce,

    Well, that’s the way it’s always done. The latest thirty-year period ending on a decade. Harmless as long as you keep in mind what’s going on.

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