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火星では,地球に似た砂の流れが,火星の砂の流れに似ている
N T Bridges1, F Ayoub, J-P Avouac
1Space Department, Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland 20723, USA.
Nature
|May 19, 2012
まとめ
強い火星風は珍しいことではない. 火星の砂丘は活発に移動しており,地球に匹敵する大規模な砂の輸送と景観の変化を示しています. これは,火星の風活動に関する以前の仮定に異議を唱える.
科学分野:
- 惑星科学は惑星科学である.
- 地質学 地質学 地質学
- 大気科学 大気科学
背景:
- 以前の研究では,火星で強い,持続的な風はまれで,現在の砂丘の活動に疑問を投げかけていると示唆されていました.
- 火星に豊富な砂丘と風による侵食の証拠は,限られた気象学的データと対照的です.
- 最近の研究では,砂の活動が示されているが,大規模な砂丘の移動は確認できなかった.
研究 の 目的:
- 火星のニリパテラ (Nili Patera) 砂丘地帯における砂の移動と砂丘の移動の現在の速度を調査する.
- 火星の砂丘が安定した状態にあり,移動砂で構成されているかどうかを判断するために.
- 火星の砂の輸送速度と地球の輸送速度を比較するために.
主な方法:
- 砂の波紋と砂丘の流出率の測定が行われました.
- 分析は,火星のエオリア過程の重要な場所であるニリ・パテラ・デューンフィールドに焦点を当てた.
- データは,砂丘の安定性と砂の流れを評価するために使用されました.
主要な成果:
- ニリ・パテラにある火星の砂丘は,安定状態に近い状態で,その全容量は移動砂で構成されています.
- 予期せぬほど高い砂の流れが測定され,南極のような陸上の環境で観測されたものと比較できます.
- これらの発見は,火星の実質的かつ継続的な景観改変を示しています.
結論:
- 火星では,以前考えられていたよりも,強烈で持続的な風がより一般的である可能性が高い.
- 火星の砂丘は活発に移動しており,有意なエオリア過程を示しています.
- 火星と地球における景観変化の速度は類似している可能性があり,以前の仮定に異議を唱える.
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