夏季の南極昭和基地周辺における観測から得られた海氷厚と水中光量の経験的関係 Empirical relationship between sea ice thickness and underwater light intensity based on observations near Syowa Station, Antarctica, in austral summer

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Author(s)

    • 小達 恒夫 Odate Tsuneo
    • 情報・システム研究機構国立極地研究所 National Institute of Polar Research, Research Organization of Information and Systems
    • 平譯 亨 Hirawake Toru
    • 情報・システム研究機構国立極地研究所 National Institute of Polar Research, Research Organization of Information and Systems
    • 福地 光男 Fukuchi Mitsuo
    • 情報・システム研究機構国立極地研究所 National Institute of Polar Research, Research Organization of Information and Systems

Abstract

1996年12月30日,1997年1月3日,11日,17日,29日に,南極昭和基地周辺海域の4点において水中の光合成有効放射(PAR)を測定した.4測点の氷厚及び積雪は,それぞれ2.06-3.64m及び0.04-0.70mであった.海氷直下のPARは,0.1-6.6μmolm^-2s^-1と見積もられた.氷厚と海氷直下のPARの間には,有意な負の相関があった.過去の値からも同様の関係式が得られた.これら極域で得られた全ての値を用いて,氷厚と水中PARの間の経験的関係式を求めた.得られた式は,氷上の雪により空中PARが約20%に減少した後,海氷1mでPARが一桁低くなることを示す.

Underwater light intensity was measured as photosynthetically active radiation (PAR) at four sites near Syowa Station, Antarctica, on 30 December 1996, and 3, 11, 17, and 29 January 1997. The sites were covered with several different thicknesses of sea ice (2.06-3.64m) and snow (0.04-0.70m). The estimated PAR intensities just under the sea ice were 0.1-6.6μmolm^-2s^-1. There was a significant negative correlation between sea ice thickness and PAR just under the sea ice. A similar relationship was obtained when the previously reported values in the literature were analyzed. Using data from the present and previous studies, an empirical equation is proposed. The equation implies that snow layer reduces the incidence to about 20% of surface irradiance, and that PAR decreases by one order of magnitude with each 1 m increase of the sea ice thickness.

Journal

  • Antarctic record

    Antarctic record 48(2), 91-97, 2004-07

    National Institute of Polar Research

Codes

  • NII Article ID (NAID)
    110000963870
  • NII NACSIS-CAT ID (NCID)
    AN00181831
  • Text Lang
    ENG
  • Article Type
    departmental bulletin paper
  • ISSN
    00857289
  • NDL Article ID
    7122997
  • NDL Source Classification
    ZM1(科学技術--科学技術一般)
  • NDL Call No.
    Z14-316
  • Data Source
    NDL  NII-ELS  IR 
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