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Related Concept Videos

Boundary Layer Characteristics01:18

Boundary Layer Characteristics

When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...
Effect of Sea Water on Concrete01:22

Effect of Sea Water on Concrete

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, which undergo...
Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
Physiological Barriers01:25

Physiological Barriers

Physiological barriers are semi-permeable cellular structures restricting drug diffusion into intracellular compartments and tissues. There are six types of physiological barriers: blood endothelial, cell membrane, blood-brain, blood-cerebrospinal fluid (CSF), blood-placenta, and blood-testis barriers.
The blood endothelial barrier is the most porous of these. It allows all small ionized, un-ionized, and lipophilic molecules to pass through the endothelial lining into the interstitial space...
Precipitation Processes01:12

Precipitation Processes

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...

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Related Experiment Video

Updated: May 19, 2026

An Integrated Micro-Device System for Coral Growth and Monitoring
05:58

An Integrated Micro-Device System for Coral Growth and Monitoring

Published on: July 21, 2023

Ocean barrier layers' effect on tropical cyclone intensification.

Karthik Balaguru1, Ping Chang, R Saravanan

  • 1Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 15, 2012
PubMed
Summary

Salinity barrier layers significantly intensify tropical cyclones by limiting ocean cooling. Understanding these ocean features is key to improving tropical cyclone intensity forecasts.

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Area of Science:

  • Oceanography
  • Meteorology
  • Climate Science

Background:

  • Tropical cyclone intensity forecasts are crucial for disaster mitigation.
  • Environmental factors significantly influence cyclone path and intensity.
  • Upper-ocean features play a critical role in modulating storm development.

Purpose of the Study:

  • To investigate the impact of salinity-induced barrier layers on tropical cyclone intensification.
  • To quantify the relationship between barrier layers and storm intensity changes.
  • To highlight the importance of salinity structure in oceanographic observations for forecasting.

Main Methods:

  • Utilizing a combination of observational data and numerical model simulations.
  • Analyzing the stratification and stability effects of barrier layers on ocean mixing.
  • Assessing changes in enthalpy flux from the ocean to the atmosphere.

Main Results:

  • Tropical cyclone intensification is significantly enhanced by salinity-induced barrier layers.
  • Barrier layers reduce storm-induced vertical mixing and sea surface temperature cooling.
  • Tropical cyclone intensification rates are nearly 50% higher over barrier layers.

Conclusions:

  • Salinity-induced barrier layers are critical factors in tropical cyclone intensification.
  • Accurate observation of upper-ocean salinity structure is essential for improved intensity forecasts.
  • Changes in barrier layer distribution due to global warming may impact future tropical cyclone activity.