Related Experiment Video
Updated: Jul 3, 2026

05:07
Assessing the Particulate Matter Removal Abilities of Tree Leaves
Published on: October 7, 2018
[Relationship between surface UV radiation and air pollution in Beijing]
Jun-lin An1, Yue-si Wang, Xin Li
1Department of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China. junlinan@nuist.edu.cn
Huan Jing Ke Xue= Huanjing Kexue
|July 22, 2008
Summary
Air pollution significantly reduces ground-level ultraviolet (UV) radiation in Beijing, with pollutants like ozone and nitrogen oxides causing up to a 50% decrease. This UV reduction is more pronounced than that of total solar radiation.
Area of Science:
- Atmospheric science
- Environmental science
- Radiative transfer modeling
Context:
- Beijing experiences significant air pollution, impacting atmospheric conditions.
- Understanding the interplay between air quality and solar radiation is crucial for environmental and health assessments.
Purpose:
- To analyze the relationship between surface ultraviolet (UV) radiation and air pollutant concentrations in Beijing.
- To quantify the impact of air pollution on UV radiation levels using the TUV4.4 model.
Summary:
- A strong inverse relationship was observed between ground-level UV radiation and total ozone content.
- High levels of air pollution, including tropospheric ozone and nitrogen oxides, were found to reduce UV radiation by up to 50%.
- The impact of clouds and air pollution on UV radiation is more substantial than on total solar radiation, with UV reductions being approximately double.
Impact:
- Provides critical data on UV radiation variability due to air pollution in a major urban center.
- Informs public health advisories regarding UV exposure and air quality.
- Contributes to climate and atmospheric modeling by detailing pollutant effects on solar radiation components.
Related Concept Videos
Radiation Pressure: Problem Solving
The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...
Linear Approximations
For a differentiable function of two variables, linear approximation estimates values near a known point by replacing the curved surface with its tangent plane. Consider the function\begin{equation*}f(x,y)=x^2+3y^2\end{equation*}near the point (2, 1). The exact value at this point is f(2, 1) = 22 + 3(1)2 = 4 + 3 = 7.The linear approximation of f(x, y)) near (a, b) is\begin{equation*}L(x,y)=f(a,b)+f_x(a,b)(x-a)+f_y(a,b)(y-b)\end{equation*}First, compute the partial derivatives: fx(x, y) = 2x and...
Radiation: Applications
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
The average...
Absorption of Radiation
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Surface Integrals
A curved roof has a surface area that is generally larger than its flat projection. To estimate the cost of painting it, the curved surface area must first be calculated. If the roof is represented parametrically by a vector-valued function r(u,v), then each point in a parameter domain D corresponds to a point on the surface S. This connection allows the curved surface to be studied through a two-dimensional parameter region.The parameter domain D is divided into many small rectangles. A...
