昼間補正が衛星から導かれた低熱帯圏の温度に与える影響
1Remote Sensing Systems, 438 First Street, Suite 200, Santa Rosa, CA 94501, USA.
Science (New York, N.Y.)
|September 6, 2005
まとめ
衛星による測定は,昼間の漂流で修正すると,冷却ではなく熱帯温暖化を示している. この新しい修正は,地表と上層熱帯圏の傾向と低い熱帯圏の温度を一致させる.
科学分野:
- 気候科学 気候科学
- 大気物理学 大気物理学
- 衛星リモートセンシング.
背景:
- 下層トロポスフィアの10年間の気温動向の衛星測定は,歴史的に表層と比較して熱帯の冷却を示しています.
- 衛星測定時間の昼間偏移は,人工的なトレンドを導入し,正確な昼間修正を必要とします.
研究 の 目的:
- 熱帯の衛星による低熱帯気温の改善された昼間補正を導き,適用する.
- 衛星による気温の動向を,地表やその他の大気層の気温データと調和させる.
主な方法:
- 衛星によるマイクロ波測定に基づく熱帯地域の新しい昼間補正因子の導出.
- 下層熱帯圏における10年スケールの温度変化を計算するために,新しい補正を適用する.
- 修正された衛星温度動向を,地表および中部/上部トロポスフィアの温度データと比較.
主要な成果:
- 熱帯で導出された昼間補正は,以前に使用された補正の反対のサインです.
- 新しい補正を適用すると,熱帯圏下の熱帯圏で顕著な温暖化が明らかになる.
- 修正された衛星温度動向は,地表温度上昇と,衛星から派生した中上熱帯圏温度動向と一致しています.
結論:
- 熱帯下層熱帯圏の気温傾向に関する以前の衛星ベースの評価は,修正されていない昼間効果によって偏っている可能性があります.
- 修正された昼間修正は,熱帯温暖化のより正確な表現を提供し,他の気候指標と整合しています.
- 正確な昼間修正は,衛星からの気候動向の信頼性の高い解釈に不可欠です.
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