静力学平衡を仮定して補正したデータによる東京都心部の気圧低下の検出  [in Japanese] Detection of the Atmospheric Pressure Depression in the Center of Tokyo Using the Data Corrected Assuming Hydrostatic Equilibrium  [in Japanese]

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Abstract

本研究では,東京都内20地点で気象観測を行ったMETROS(Metropolitan Environmental Temperature and Rainfall Observation System)のデータを用いて,都区部の夏季夜間における気圧分布を提示した.METROSの気圧データには地点に固有の器差が含まれており,都市内部の微小な気圧差を表すためには十分な器差補正が必要とされる.METROSの観測機器は既に撤去されているため,本研究では静力学平衡を仮定し,METROS地点と東京(大手町)の海面気圧が等しいとみなせる,両地点の地上気温が同等な場合の気圧差によって,気圧データの補正を試みた.補正後の気圧分布は,気温分布や風系,収束域と矛盾せず,概ね妥当な補正が施されたと考えられる.都心部を中心とした典型的なヒートアイランドが形成されている事例では,都心部が周辺部に比べて0.2~0.3hPa低圧となっている.

The present study showed the atmospheric pressure distribution in the Tokyo ward area at nighttime in summer using observational data. The data from Tokyo's high density observation system (METROS: Metropolitan Environmental Temperature and Rainfall Observation System) was used. It was necessary to correct the METROS data to show the detailed pressure distribution in the city, because the data has the specific instrument error at each station. However, the observational instruments of METROS had already been removed. Then, we corrected the atmospheric pressure data using the pressure data difference when the sea level pressure at the Tokyo Meteorological Observatory was equal to that at each METROS station, assuming hydrostatic equilibrium. It is thought that the corrected pressure distribution given in this study is reasonable because it is consistent with the air temperature distribution, wind system, and convergence zone. In the case study analysis during which a typical heat island existed in the center of Tokyo, we detected a significant pressure difference where the atmospheric pressure in the center of Tokyo is 0.2 or 0.3hPa lower than that in the surrounding areas.

Journal

  • 天気

    天気 58(2), 131-141, 2011-02-28

    日本気象学会

References:  17

Cited by:  2

Codes

  • NII Article ID (NAID)
    110008460634
  • NII NACSIS-CAT ID (NCID)
    AN00151568
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    05460921
  • NDL Article ID
    11023467
  • NDL Source Classification
    ZM43(科学技術--地球科学--気象)
  • NDL Call No.
    Z15-35
  • Data Source
    CJP  CJPref  NDL  NII-ELS  NDL-Digital 
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