Ozonesonde Observations in the Equatorial Eastern Pacific : the Shoyo-Maru Survey

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概要

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• We have conducted GPS radiosonde and ozonesonde observations on board the research vessel "Shoyo-Maru" in the equatorial eastern Pacific. These observations took place in September and October 1999 as a part of the Soundings of Ozone and Water in the Equatorial Region (SOWER)/Pacific mission. The mean profile of ozone is similar to that for the dry season (September to October) at San Cristobal, Galapagos (0.9°S, 89.6°W) located in the equatorial eastern Pacific. The mean tropospheric ozone concentration is about 40 ppbv with a maximum in the mid-troposphere. Compared with the mean profile during the dry season at Watukosek, Indonesia (75°S, 112.6°E), this mid-tropospheric maximum is larger, and a sharp increase of ozone below the tropopause begins at a lower altitude for the Shoyo-Maru profile. We frequently observed layers in which ozone and humikity are highly anti-correlated. These layers have vertical scales from several kilometers to several hundred meters. Horizontal scales of these layers are roughly 1000 km, which may correspond to time scales of about 2 days, since the vessel sailed about 500 km/day. These layers are related to northerly winds, which bring in wet and ozone-poor air from the inter-tropical convergence zone situated in the northern side of the main cruise track. Similar layers were observed in ozone profiles at San Cristobal and Watukusek, mostly during the dya season, suggesting the existence of layers advected withcal mixing.

• 社団法人日本気象学会の論文
• 2002-09-25

著者

• Oltmans S.

  NOAA

• SHIOTANI M.

  Radio Science Center for Space and Atmosphere, Kyoto University

• FUJIWARA M.

  Radio Science Center for Space and Atmosphere, Kyoto University

• HASEBE F.

  Department of Environmental Sciences, Ibaraki University

• HASHIZUME H.

  Graduate School of Environmental Earth Science, Hokkaido University

• VOMEL H.

  Cooperative Institute for Research in Environmental Sciences, University of Colorado

• OLTMANS S.

  Climate Monitoring and Diagnostics Laboratory, NOAA

• WATANABE T.

  Tohoku National Fisheries Research Institute

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