タイタンの熱帯の嵐
E L Schaller1, H G Roe, T Schneider
1Institute for Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA. schaller@ifa.hawaii.edu
Nature
|August 14, 2009
まとめ
土星の衛星タイタンの一時的な熱帯雲は,他の緯度でコンベクションを誘発することができます. この発見は,赤道付近で観測されたメタンで彫られた川や運河を説明し,タイタンの気象パターンに関する以前の仮定に異議を唱えます.
科学分野:
- 惑星科学は惑星科学である.
- 大気科学 大気科学
- 天体生物学 アストロバイオロジー
背景:
- タイタンの熱帯は,以前は雲がなく,降雨が少ないと考えられていた.
- 熱帯の運河や乾燥した河床のような地表の特徴は,コンベクションによって説明できなかった.
- メタンベースの水文循環は,タイタンの気候を理解するための鍵です.
研究 の 目的:
- タイタンの熱帯雲の存在と影響を調査する.
- 緯度を越えて雲の形成と分布を駆動するメカニズムを理解する.
- タイタンの赤道面の特徴に関する説明を再評価する.
主な方法:
- タイタンの熱帯緯度における一時的で明るい熱帯雲の観測.
- 初期の雲パルスからの惑星波の発生と伝播の分析.
- 雲の活動が表面の特徴や大気条件と相関していること.
主要な成果:
- 熱帯地域で予期せぬ明るい,一時的な熱帯圏雲の発見.
- 初期の熱帯雲の活動が惑星の波を生み出した証拠です.
- これらの波は,以前は雲のない高緯度地域における雲の活動を誘発した.
結論:
- ある緯度におけるコンベクトパルスは,他の地域における短期的なコンベクトを誘発する可能性があります.
- この現象は,通常,コンベクションをサポートしない緯度でも発生する可能性があります.
- この発見は,赤道付近でメタンを採掘した川や運河について,潜在的な説明を提供している.
関連する概念動画
What is Weather?
17.2K
Overview
17.2K
What is Climate?
17.5K
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
17.5K
Global Climate Change
24.4K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.4K
Torque
18.5K
Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
18.5K
Tidal Forces
2.9K
The origin of Earth's ocean tides has been a subject of continuous investigation for over 2000 years. However, the work of Newton is considered to be the beginning of the proper understanding of the phenomenon. Ocean tides are the result of gravitational tidal forces. These same tidal forces are present in any astronomical body; they are responsible for the internal heat that creates the volcanic activity on Io, one of Jupiter's moons, and the breakup of stars that get too close to...
2.9K
Precipitation Processes
5.1K
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
5.1K


