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Boundary Layer Characteristics

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...

$Influence of Earth's Curvature and Atmospheric Refraction on Leveling$ 01:26

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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...

Variation of Atmospheric Pressure

Variation of Atmospheric Pressure

Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...

Precipitation Processes

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...

Static, Stagnation, Dynamic and Total Pressure

Static, Stagnation, Dynamic and Total Pressure

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What is Climate?

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Related Experiment Video

Updated: May 12, 2026

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

Published on: June 13, 2020

On the relationship between stratospheric structure and tropospheric blocking patterns.

M J P Cullen¹, K Ngan

¹Met Office, Fitzroy Road, Exeter EX1 3PB, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|April 17, 2013

Summary

Atmospheric blocking, crucial for weather forecasting, is influenced by the atmosphere's vertical structure. Large-scale blocking requires vertical scales extending into the stratosphere, especially when stratospheric activity is low.

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Evolution of Staircase Structures in Diffusive Convection

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Last Updated: May 12, 2026

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

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Published on: June 13, 2020

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

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Published on: June 8, 2015

Evolution of Staircase Structures in Diffusive Convection

Evolution of Staircase Structures in Diffusive Convection

Published on: September 5, 2018

Area of Science:

Atmospheric Science
Climatology
Meteorology

Background:

Atmospheric blocking patterns disrupt normal westerly flow, impacting extended range and seasonal weather forecasts.
Understanding anomalous atmospheric behavior is key for accurate climate modeling and prediction.

Purpose of the Study:

To investigate the influence of atmospheric vertical structure on tropospheric blocking climatology.
To explore the relationship between stratospheric activity and the vertical scale of atmospheric anomalies.

Main Methods:

Analysis of geopotential height evolution.
Application of dynamical theory to understand circulation development and decay.
Examination of stratosphere-troposphere coupling.

Main Results:

The vertical structure of the atmosphere significantly influences tropospheric blocking.
Efficient development of anomalous circulations requires a specific aspect ratio, favoring large vertical scales.
Large-scale tropospheric anomalies associated with blocking extend vertically into the stratosphere.

Conclusions:

Stratospheric activity restricts the vertical scale of tropospheric developments, affecting blocking patterns.
A deep vertical scale, extending into the stratosphere, is necessary for the development of large-scale tropospheric anomalies.
Understanding these vertical dynamics is crucial for improving atmospheric predictions.