Upper atmosphere cooling over the past 33 years

DOI Web Site Web Site 被引用文献8件 参考文献26件
  • Y. Ogawa
    National Institute of Polar Research Tokyo Japan
  • T. Motoba
    Johns Hopkins University Applied Physics Laboratory Laurel Maryland USA
  • S. C. Buchert
    Swedish Institute of Space Physics Uppsala Sweden
  • I. Häggström
    EISCAT Scientific Association Kiruna Sweden
  • S. Nozawa
    Solar‐Terrestrial Environment Laboratory Nagoya University Nagoya Japan

書誌事項

公開日
2014-08
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2014gl060591
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Theoretical models and observations have suggested that the increasing greenhouse gas concentration in the troposphere causes the upper atmosphere to cool and contract. However, our understanding of the long‐term trends in the upper atmosphere is still quite incomplete, due to a limited amount of available and well‐calibrated data. The European Incoherent Scatter radar has gathered data in the polar ionosphere above Tromsø for over 33 years. Using this long‐term data set, we have estimated the first significant trends of ion temperature at altitudes between 200 and 450 km. The estimated trends indicate a cooling of 10–15 K/decade near the <jats:italic>F</jats:italic> region peak (220–380 km altitude), whereas above 400 km the trend is nearly zero or even warming. The height profiles of the observed trends are close to those predicted by recent atmospheric general circulation models. Our results are the first quantitative confirmation of the simulations and of the qualitative expectations.</jats:p>

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