Comparison of finite differencing, time smoothing and spline fitting algorithms for estimating airspeed metadata from coarse-resolution aircraft position and wind reports
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Comparison of finite differencing, time smoothing and spline fitting algorithms for estimating airspeed metadata from coarse-resolution aircraft position and wind reports

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    National Centers for Environmental Prediction (U.S.)
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  • Description:
    As operational data assimilation procedures become more sophisticated and the need to address and allow for biases and non-Gaussianity in the given data becomes more pressing, we find we need to augment our knowledge about the details concerning the data to include not just the assimilated data values themselves, but also the “κδϟαγαϟα” ϟϝαϟ γδπϐοζβδ ϟϝδ γζεεδοζλϛ ϐμλγζϟζμλπ ρλγδο ςϝζϐϝ ϟϝδ αππζκζιαϟδγ κδαπροδκδλϟπ αοδ καγδ. Ζλ ϟϝδ ϐαπδ με αζοϐοαεϟ κδαπροδκδλϟπ με ϟδκνδοαϟροδ πρϐϝ οδιδσαλϟ κδϟαγαϟα ρπδγ ϟμ ζλεδο ϟϝδ μσδοαιι ζλπϟορκδλϟ βζαπ κζϛϝϟ ζλϐιργδ ϟϝδ αιϟζϟργδ, αϟϟζϟργδ αλγ αζοπνδδγ με ϟϝδ αζοϐοαεϟ. Ρλεμοϟρλαϟδιυ, πρϐϝ ναοακδϟδοπ αοδ λμϟ ϛδλδοαιιυ οδαγζιυ ασαζιαβιδ ζλ ϟϝδ οδνμοϟπ ϟϝδκπδισδπ αλγ κρπϟ μεϟδλ ϟϝδοδεμοδ βδ ζλεδοοδγ ζλγζοδϐϟιυ εομκ ςϝαϟδσδο ζλεμοκαϟζμλ ϐαλ βδ ϛιδαλδγ εομκ ϟϝδ ϛζσδλ οδνμοϟπ. Μλδ ϛμμγ δτακνιδ με ϟϝζπ ζπ ϟϝδ αζοπνδδγ· ϟϝδ αϟϟδκνϟ ϟμ δπϟζκαϟδ ζϟ εομκ πρϐϐδππζσδ οδνμοϟδγ νμπζϟζμλπ ϟμϛδϟϝδο ςζϟϝ ϟϝδ κδαπροδγ ςζλγ ορλπ ζλϟμ ϟϝδ γζεεζϐριϟυ ϟϝαϟ οδνμοϟδγ νμπζϟζμλπ αλγ ϟζκδπ αοδ ρπραιιυ ϛζσδλ μλιυ ϟμ ςζϟϝζλ σδου ϐοργδ εζϛροδπ με νοδϐζπζμλ. Ϟϝδ εμϐρπ με ϟϝζπ λμϟδ ζπ ϟϝδ νομβιδκ με δπϟζκαϟζλϛ αννομτζκαϟδ αζοϐοαεϟ κμϟζμλ βυ αννιυζλϛ εζλζϟδ γζεεδοδλϐζλϛ αλγ ϟζκδ-πκμμϟϝζλϛ ϟμ ϟϝδ οδνμοϟδγ αννομτζκαϟδ νμπζϟζμλπ (ζϟ βδζλϛ αππρκδγ ϝδοδ ϟϝαϟ πρεεζϐζδλϟιυ νοδϐζπδ ϟδκνμοαι ϐμμογζλαϟζμλ ϝαπ βδδλ αϐϝζδσδγ βυ μϟϝδο κδαλπ), μο εζϟϟζλϛ ϟϝδπδ αννομτζκαϟδ νμπζϟζμλπ, ςζϟϝ πμκδ πιαϐθ ϐμκκδλπροαϟδ ςζϟϝ ϟϝδζο νοδϐζπζμλ, ρπζλϛ αλ αγανϟαϟζμλ με ϟϝδ κδϟϝμγ με “πιαιμκ πνιζλδπ”. Ϟϝδ πκμμϟϝζλϛ κδϟϝμγ ςδ νομνμπδ ζπ ϐμκνρϟαϟζμλαιιυ δεεζϐζδλϟ αλγ πϐαιδπ απ α “εαπϟ” κδϟϝμγ ςζϟϝ οδπνδϐϟ ϟμ α ϐϝαλϛδ με ζϟπ ϐϝαοαϐϟδοζπϟζϐ ϟζκδ-πϐαιδ. Απ ςδ γδκμλπϟοαϟδ, ϟϝζπ κδϟϝμγ ρπραιιυ ιδαγπ ϟμ νιαρπζβιδ νομεζιδπ με αζοϐοαεϟ κμϟζμλ ςϝζϐϝ αοδ λμϟ μβϟαζλδγ βυ λαζσδ εζλζϟδ γζεεδοδλϐδ κδϟϝμγπ αλγ ςϝζϐϝ αννδαο ϟμ βδ απ ϛμμγ απ, αλγ κμοδ ομβρπϟ ϟϝαλ, ϟϝδ οδπριϟπ ϛζσδλ βυ ϟϝδ κμοδ πμνϝζπϟζϐαϟδγ (αλγ κμοδ ϐμπϟιυ) πνιζλδ κδϟϝμγ. Χγμζ:»«.7“89/Σ͵/ΜΛ-ΛCΔΝ-ʹ8͵ (ϝϟϟν://γμζ.μοϛ/»«.7“89/Σ͵/ΜΛ-ΛCΔΝ-ʹ8͵)Ω
  • Content Notes:
    R. James Purser and Yanqiu Zhu.

    "December 2016."

    "This is an unreviewed manuscript, primarily intended for informal exchange of information among NMC staff members."

    System requirements: Adobe Acrobat Reader.

    Includes bibliographical references (page 17).

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  • Series:
    Office note (National Centers for Environmental Prediction (U.S.)) ; 485
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  • Document Type:
    Office Note
  • Place as Subject:
    United States
  • Rights Information:
    Public Domain
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