氷河期の間,南太平洋の砂塵の蓄積が増えた
F Lamy1, R Gersonde, G Winckler
1Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
Science (New York, N.Y.)
|January 25, 2014
まとめ
南洋の塵積は,過去100万年の氷河期間に3倍に増加した. 南太平洋,南極,南大西洋の他の地域でも同様のパターンがみられ,大気圧が広範囲に広がり,塵源に影響を与えたことを示唆している.
科学分野:
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- 海洋学 海洋学 海洋学
- 気候科学 気候科学
背景:
- 南大洋の塵の堆積は,過去の世界的な気候の動態に大きな影響を与えます.
- この塵の堆積の時間的および地理的な変動は完全に理解されていません.
- 南極太平洋は,これらの変動を研究するための最大の南洋セクターを表しています.
研究 の 目的:
- 過去100万年における南極太平洋における氷河期と氷河期間の塵の供給サイクルを再構築する.
- これらのサイクルを,南大洋の他の地域および潜在的な発生源地域からの塵記録と比較する.
- 大規模な塵の堆積パターンを誘発する一般的な気候フォースリングを特定する.
主な方法:
- 南極太平洋からの塵の堆積データの分析.
- リトゲン性沈殿物の堆積パターンと南極と南大西洋の塵記録の比較.
- 塵の堆積のタイミングとパターンが,オーストラリア,ニュージーランド,パタゴニアのような潜在的な発生源地域と相関している.
主要な成果:
- 南極太平洋の塵の堆積は,過去100万年にわたる氷河期間の氷河期と比較して,氷河期間の3倍でした.
- 南太平洋の氷河期と氷河期間の塵の堆積パターンは,南極と南大西洋のものと類似している.
- これらの類似性は,オーストラリア,ニュージーランド,パタゴニアからの塵の供給に影響を及ぼす共通の気候フォースリングを示唆しています.
結論:
- 南部の西風の移転や,氷河による砂塵の動員強化などの大規模な気候強制は,南洋の砂塵堆積に影響を与えました.
- この研究は,南洋の塵による過去の気候変動の調節に関する重要なデータを提供します.
- 過去の塵のサイクルを理解することで,気候システムの相互作用に関する知識が深まります.
さらに関連する動画
09:01An Ultra-clean Multilayer Apparatus for Collecting Size Fractionated Marine Plankton and Suspended Particles
Published on: April 19, 2018
8.6K
10:28Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
Published on: June 13, 2020
6.8K
関連する概念動画
01:50Global 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
01:27Microbes and Climate Change
91
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
91
01:30Marine Microbial Ecology
66
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
66
01:22The Sulfur Cycle
41.6K
Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
41.6K
01:12Precipitation Processes
5.0K
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...
5.0K
01:10Types of Coprecipitation
5.5K
Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
5.5K