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"植物の光合成に対するCO2の肥料化効果の最近の世界的な減少"に関するコメント

Christian Frankenberg^1,2, Yi Yin¹, Brendan Byrne²

¹Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA.

Science (New York, N.Y.)

|September 23, 2021

まとめ

衛星データのバイアスはCO2の受精効果の発見に異議を唱える. 研究者は,気候変化に関する研究に影響を与える,植物の動向のためのAdvanced Very High Resolution Radiometerデータを使用しないよう警告しています.

科学分野:

地球システム科学
リモートセンシング
気候変動に関する研究

背景:

大気中のCO2が植物の成長を促進するCO2肥料化効果は,気候変動モデルにおける重要な要因です.
長期的な衛星記録は,地球上の植生反応と光合成のプロキシを推定するためにますます使用されています.
過去の研究では,衛星データの分析に基づいて,CO2の受精効果が著しく低下したと示唆されました.

研究の目的:

報告されたCO2受精効果の減少の強さを再評価する.
植生傾向の分析に影響を与える可能性のあるデータアーティファクトを衛星記録から特定する.
衛星から得られた植生指標の信頼性の高い使用に関するガイドラインを提供すること.

主な方法:

長期衛星データの分析,特に高度な超高解像度放射計 (AVHRR) の記録に焦点を当てた.
植物の反射率に関連するAVHRRデータ内の体系的なバイアスの調査.
特定されたバイアスの影響による光合成プロキシと植生指標の評価.

主要な成果:

高解像度放射線測定器 (AVHRR) のデータでは,小規模な系統的バイアスが検出されました.
これらのバイアスは,植物の近赤外線反射率 (NIRv) を含む植物の傾向の分析に大きく影響することが判明しました.
このデータバイアスのために,Wang et al.が報告したCO2受精効果の有意な減少の重要な発見は,堅固ではないと判断されました.

結論:

植物性の長期的変化,特にNIRvと植物性の指数の動向を検出するためのAdvanced Very High Resolution Radiometer (AVHRR) のデータの信頼性は疑わしい.
CO2の受精効果を評価するためにAVHRRデータに基づいた研究を解釈する際には注意が必要です.
衛星データ処理の技術を精進したり,気候変動の影響評価を確実にするための代替データセットを活用するために,さらなる研究が必要になる可能性があります.

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