関連する実験動画
Updated: Jul 30, 2025

07:28
Evolution of Staircase Structures in Diffusive Convection
Published on: September 5, 2018
6.6K
インド洋の塩分濃度増減 氷河期の海洋循環回復
Sophie Nuber1,2,3, James W B Rae4, Xu Zhang5
1School of Earth and Environmental Sciences, Cardiff University, Cardiff, UK. snuber@ntu.edu.tw.
Nature
|May 10, 2023
まとめ
氷河期は海水位が下がるため,インド洋の塩分度が上昇し,海洋循環に影響を与えました. 脱氷時に放出された塩分は,大西洋南側転覆循環と地球気候に影響を与えた.
科学分野:
- 海洋学
- 古代気候学
- 気候科学
背景:
- Agulhas Leakageを通じたインド洋の塩の輸送は,北大西洋の深水コンベクションと海洋の転覆循環に影響を与えます.
- 氷河期間のインド洋の塩分度の変化とその循環への影響は,まだ十分に理解されていません.
研究 の 目的:
- 氷河期におけるインド洋の表面塩分を調査する.
- 塩分変化のメカニズムと海洋循環と地球温暖化への影響を理解する
主な方法:
- 氷河のインド洋の表面塩の予算の分析
- 海洋循環への塩分放出の影響を評価するための気候モデルシミュレーション
主要な成果:
- インド洋の表面の塩分は氷河の激化中に増加し,氷河の最大値に達した.
- 氷河期における海平面の低下は,インドネシアの島の土地を露出させ,インドネシアのスルーフローからの淡水供給を減少させた.
- Agulhas Leakage経由でのこの蓄積された塩の脱氷による放出は,大西洋南側転覆循環に大きな影響を及ぼした.
結論:
- インド洋の氷河期の塩分量は現代と大きく異なっており,海面の変化にダイナミックに反応した.
- Agulhas Leakageは,塩分変化を運ぶ上で重要な役割を果たし,大西洋南側転覆循環と脱氷期における地球気候に影響を与えた.
関連する概念動画
Responses to Salt Stress
13.2K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
13.2K
Global Climate Change
24.6K
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.
24.6K
Osmoregulation in Fishes
50.1K
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
50.1K
Ionic Strength: Effects on Chemical Equilibria
1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.5K
Factors Influencing Microbial Growth: Osmolarity
50
Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...
50
Effect of Sea Water on Concrete
314
Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks,...
Concrete in areas between tide marks,...
314

