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    A Quality Assurance System for Canadian Hourly Pressure Data

    Source: Journal of Applied Meteorology and Climatology:;2007:;volume( 046 ):;issue: 011::page 1804
    Author:
    Wan, Hui
    ,
    Wang, Xiaolan L.
    ,
    Swail, Val R.
    DOI: 10.1175/2007JAMC1484.1
    Publisher: American Meteorological Society
    Abstract: In this study a comprehensive quality assurance (QA) system, which includes the hydrostatic check combined with a statistical homogeneity test, is designed and applied to hourly pressure records (for 1953?2002) from 761 Canadian stations, to produce a high-quality database of hourly station and sea level pressures for various climate studies. The main principles of the QA system are described in detail, followed by a brief emphasis on the error correction algorithms. The general performance of the QA system and the main problems in the Canadian historical hourly pressure database are discussed and illustrated through various examples. The results show that there are serious systematic errors (i.e., sudden changes in the mean, or mean shifts) in the Canadian hourly pressure database, which are caused either by the use of incorrect station elevation values in the reduction of barometer readings to station or sea level pressure values (e.g., the ?50-ft rule? or station relocation without updates to the station elevation), by transposing/swapping station and sea level pressure values, or by mistakes made in the archive data ingestion or data recording/digitization processes (e.g., use of a wrong base number). Random errors also exist and are mainly due to the transposition of two digits or miscoding of one or two digits. These errors must be corrected before the data are used in various climate studies, especially climate change?related studies.
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      A Quality Assurance System for Canadian Hourly Pressure Data

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4206501
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    • Journal of Applied Meteorology and Climatology

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    contributor authorWan, Hui
    contributor authorWang, Xiaolan L.
    contributor authorSwail, Val R.
    date accessioned2017-06-09T16:18:02Z
    date available2017-06-09T16:18:02Z
    date copyright2007/11/01
    date issued2007
    identifier issn1558-8424
    identifier otherams-65292.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4206501
    description abstractIn this study a comprehensive quality assurance (QA) system, which includes the hydrostatic check combined with a statistical homogeneity test, is designed and applied to hourly pressure records (for 1953?2002) from 761 Canadian stations, to produce a high-quality database of hourly station and sea level pressures for various climate studies. The main principles of the QA system are described in detail, followed by a brief emphasis on the error correction algorithms. The general performance of the QA system and the main problems in the Canadian historical hourly pressure database are discussed and illustrated through various examples. The results show that there are serious systematic errors (i.e., sudden changes in the mean, or mean shifts) in the Canadian hourly pressure database, which are caused either by the use of incorrect station elevation values in the reduction of barometer readings to station or sea level pressure values (e.g., the ?50-ft rule? or station relocation without updates to the station elevation), by transposing/swapping station and sea level pressure values, or by mistakes made in the archive data ingestion or data recording/digitization processes (e.g., use of a wrong base number). Random errors also exist and are mainly due to the transposition of two digits or miscoding of one or two digits. These errors must be corrected before the data are used in various climate studies, especially climate change?related studies.
    publisherAmerican Meteorological Society
    titleA Quality Assurance System for Canadian Hourly Pressure Data
    typeJournal Paper
    journal volume46
    journal issue11
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/2007JAMC1484.1
    journal fristpage1804
    journal lastpage1817
    treeJournal of Applied Meteorology and Climatology:;2007:;volume( 046 ):;issue: 011
    contenttypeFulltext
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