リモートセンシング:海氷の中の新しい島を探す
1Ørsted DTU, Technical University of Denmark, Ørsteds Plads B-348, 2800 Kgs Lyngby, Denmark. jm@oersted.dtu.dk
Nature
|March 8, 2002
まとめ
衛星レーダー干渉測定により,トバイアス島は以前考えられていたよりも大きいことが明らかになった. この技術は,氷で覆われた島々を効果的にマッピングし,北極海の氷に隠された新しい島々を発見するのに役立ちます.
科学分野:
- 地質科学は地質科学である.
- リモートセンシング (リモートセンサー)
- アークティック・リサーチ・アークティック研究
背景:
- 1993年にグリーンランド沖で発見されたトバイアス島は,当初は小規模な小川システムとして報告されていた.
- その真の大きさと範囲は,その遠隔の氷で覆われた性質のために,ほとんど確認されていないままでした.
研究 の 目的:
- トバイアス島の大きさと位置を正確に決定するために.
- 氷で覆われた北極島の検出と地図作成のための衛星レーダー干渉測定の有効性を評価する.
- この地域の未発見の島々の潜在的な位置を特定する.
主な方法:
- 島の地形を分析するために,衛星レーダー干渉計 (InSAR) が採用されました.
- 空中レーザースキャンデータは,補完的な測定と検証のために使用されました.
- 新しい島を発見する可能性のある安定した地域を特定するために,地理空間分析が行われました.
主要な成果:
- トバイアス島は,以前に報告されたよりも大幅に大きく,長さ2km,高さ35mの島であることが判明しました.
- この研究では,新しい小さな島群の潜在的な存在を示唆する安定した地域を正確に特定することができました.
- 衛星レーダー干渉計は,既知の島の地図作成と,潜在的な新しい陸地の特定の両方において有効であることが証明されました.
結論:
- 衛星レーダー干渉計は,北極圏の遠隔地にある氷で覆われた島の発見と地図作成のための強力で効果的なツールです.
- この発見は,トバイアス島の形態学と範囲の理解を大幅に更新しています.
- この方法論は,将来の北極探査と地図作成のイニシアチブに希望を与え,潜在的に隠された島々を明らかにします.
さらに関連する動画
13:35Reefshape: A System for the Efficient Collection and Automated Processing of Time-Series Underwater Photogrammetry Data for Benthic Habitat Monitoring
Published on: June 13, 2025
1.9K
09:19Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging
Published on: April 18, 2025
1.5K
関連する概念動画
Thermosensation
29.7K
Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
29.7K
Phase Transitions: Melting and Freezing
11.7K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
11.7K
Freezing Point Depression and Boiling Point Elevation
32.7K
Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
32.7K
Thermal Expansion
4.4K
The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
4.4K
Freezing Point Depression and Boiling Point Elevation
154
When a non-volatile solute is added to a pure solvent, it results in the lowering of the freezing point of the solvent. This phenomenon is called freezing point depression. The extent to which the freezing point is lowered depends on the molality of the solute -the number of moles of solute per kilogram of solvent and the cryoscopic constant of the solvent.From the plot of chemical potential, μ, against temperature, it is evident that the μ of both solid and liquid solvents decrease...
154
Deep Sea Microbial Ecology
53
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches...
53
