非線形メソスケール渦が表面に近い海洋のクロロフィールに及ぼす影響
Dudley B Chelton1, Peter Gaube, Michael G Schlax
1College of Oceanic and Atmospheric Sciences, 104 COAS Administration Building, Oregon State University, Corvallis, OR 97331-5503, USA. chelton@coas.oregonstate.edu
まとめ
線形的なロスビー波ではなく,大洋の渦が,大規模なクロロフィルの変動を誘発する. これらの非線形構造は,水平アドベクションを通じてクロロフィルを影響し,海洋のダイナミクスの再評価を必要とします.
科学分野:
- 海洋学 海洋学とは
- サテライト海洋学.
- 海洋生態学 海洋生態学
背景:
- 以前は,海洋のロスビー波が,衛星から観測された大規模なクロロフィルの変動性を説明すると考えられていた.
- 最近の高解像度衛星高度測定は,これらの特徴が非線形の中間スケールの一貫した構造であり,渦と呼ばれることを示しています.
研究 の 目的:
- 海面高度 (SSH) とクロロフィール (CHL) の共変性を駆動するメカニズムを再評価する.
- 海洋上部のクロロフィール系に非線形メソスケール渦が及ぼす影響を調査する.
主な方法:
- SSHフィールドの10年間の衛星高度計測定の分析.
- 上海のCHLの衛星測定の同時分析.
- 渦の構造とCHL分布の関係を調査する.
主要な成果:
- 線形ではないメソスケール渦,線形ではないロスビー波は,海洋のクロロフィールフィールドに大きな影響を与える.
- 旋回速度によるエディ誘発の水平アドベクションは,2~3週間以上の時間スケールでCHLの変動の支配的なメカニズムです.
結論:
- クロロフィルを調節する海洋渦の役割を強調する必要があります.
- SSHの特徴を線形ロスビー波として以前の解釈は改定する必要があります.
- エディのダイナミクスは,海洋の生産性と生地化学的サイクルを理解する上で重要な要素です.
関連する概念動画
Marine Microbial Ecology
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...
Freshwater Microbial Ecology
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
Primary Production
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
Influence of Earth's Curvature and Atmospheric Refraction on Leveling
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
Nonlinear Pharmacokinetics: Causes of Nonlinearity
Nonlinearity in drug pharmacokinetics is caused by various factors influencing how a drug is absorbed, distributed, metabolized, and excreted. Understanding these nonlinear processes is crucial for predicting drug behavior in the body and optimizing drug dosing regimens.
Nonlinear drug absorption can occur when the process is rate-limited by solubility, carrier-mediated transport systems, or saturation of the presystemic gut wall or hepatic metabolism. For instance, high doses of riboflavin...
Nonlinear drug absorption can occur when the process is rate-limited by solubility, carrier-mediated transport systems, or saturation of the presystemic gut wall or hepatic metabolism. For instance, high doses of riboflavin...
Eddy Currents
Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...


