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Assignment代写:Haze Weather

2017-12-06 来源: 51due教员组 类别: 更多范文

下面为大家整理一篇优秀的assignment代写范文- Haze Weather,供大家参考学习,这篇论文讨论了雾霾天气。随着空气质量的恶化,如今雾霾天气现象的问题越来越严重了。雾霾天气是一种灾害性天气,会让空气质量下降,影响生态环境,给人体带来非常大的危害。而且出现雾霾天气时,空气中往往带有细菌和病毒,易导致传染病的扩散和多种疾病的发生。

Haze Weather,雾霾天气,assignment代写,paper代写,留学生作业代写

Mist, mist, and haze are collectively called. Now climate change, environmental pollution fog haze Weather frequent occurrence, this article on fog haze weather Cause and harm detailed introduction, for reference.

With the deterioration of air quality, cloudy weather phenomenon increased, the harm increased. In recent China, cloudy weather phenomenon has been merged into fog as an early warning forecast for disastrous weather. Collectively referred to as "fog haze weather." In fact, fog and haze from a certain point of view is very different. For example: The air is damp when there is fog, the air is relatively dry when haze occurs, and the relative humidity of air is usually below 60%. The reason is due to a large number of very fine dust particles, smoke particles, salt and other evenly floating in the air, so that the effective level of visibility is less than 10KM of the air mixture corrosion phenomenon. The symbol is "∞". The diurnal variation of haze is generally not obvious. When the air mass does not change significantly, the group is more stable and lasts longer and sometimes lasts more than 10 days. Due to haze, light fog, dust storms, sand, dust, smoke and other weather phenomena, because of the floating in the air a large number of extremely fine dust particles or smoke particles such as the impact of effective level visibility is less than 10KM. Sometimes it makes it difficult to distinguish between meteorological professionals. In order to draw the correct conclusion, the weather phenomena of fog and haze can be converted to each other in combination with weather background, sky condition, air humidity, color smell and satellite monitoring.

In the traditional sense of fog, if there is no particulate matter, relative humidity to reach 400% to form, but if there are PM2.5 particles in the atmosphere, the relative humidity once saturated, it produces haze, and the haze is often more than 1 kilometers on the ground also exist. PM2.5 particles in the water vapor volume will rapidly expand, or even more than 8 times the expansion, will form a gray.

Sulphur dioxide, nitrogen oxides and inhalable particulate matter these three are mainly composed of fog haze, the first two are gaseous pollutants, and the last particulate matter is the culprit to aggravate haze and haze pollution. They are combined with the mist, making the sky suddenly grey. The English abbreviation for particulate matter is PM, and Beijing is monitoring fine particulate matter, which is the pollutant particle with a diameter of less than 2.5 microns. The particle itself is not only a pollutant, but also a carrier of heavy metals, polycyclic aromatic hydrocarbons and other toxic substances.

Large vehicles using diesel fuel are "felons" that emit fine particulate matter, including mass transit, shuttle buses, and large transport trucks. Small cars that use petrol, although they emit gaseous contaminants, such as nitrogen oxides, are easily converted to two of particulate contaminants and add to smog in foggy days.

Industrial emissions are also a major factor, in 2012 the world burning 70 trillion tons of coal, China burned 36 trillion tons, accounted for 51%, emissions of exhaust gas is conceivable.

Exhaust emissions from industrial production.

For example, metallurgy, mechanical and electrical manufacturing industry kilns and boilers, there are a large number of steam repair spray painting, building materials production kiln combustion exhaust emissions.

Dust generated by construction sites and road traffic.

Fog is an aerosol system consisting of tiny droplets or ice crystals suspended in the air near the ground, appearing in the autumn and winter months, and is the product of condensation of water vapor in the air near the ground floor. The presence of fog reduces air transparency, to worsen visibility, if the level of visibility of the target is reduced to 1000 meters, the weather phenomenon of vapor condensate suspended in the air near the ground is called fog, and the phenomenon of the target's horizontal visibility at 1000-10000 m is called light mist or haze. Atmospheric humidity should be saturated when the fog is formed. Because the fog of liquid water or ice crystals has little to do with wavelength, the fog appears milky or bluish white. Haze is composed of airborne dust, sulfuric acid, nitric acid, organic hydrocarbons and other particles. It can also cause atmospheric turbidity, blurred vision and worsen visibility, and if horizontal visibility is less than 10000 m, the visual barrier caused by an aerosol system composed of such a non aqueous composition is called haze or haze.

Fog and haze are the same as the visual barrier. But there is a big difference between the cause and the condition of haze. Fog is a large number of tiny droplets or ice crystals floating in the air, forming conditions to have a higher water vapor saturation factor. Air relative humidity often reaches 100% or nearly 100% when fog occurs. The fog has the daily change with the air humidity to appear sooner or later more common or the thickening, the day relatively reduces even disappears phenomenon. Effective level visibility is less than 1KM when fog occurs. When the effective level of visibility is 1-10km, it is called light fog.

At present, there are several main reasons for the formation of the known haze weather:

Atmospheric air pressure is low, the air circulation speed is slow, so that the small particles in the air mass aggregation, and then floating in the air, it is difficult to disperse!

In recent years, the number of private cars in China has risen significantly, incomplete statistics, only Henan convenience has nearly 2 million units. Huge numbers of private cars are causing traffic jams while also emitting a lot of exhaust. Sulfur oxides, such as sulphur dioxide, are heavily discharged to form haze.

As we all know, real estate led to the development of the construction industry, but construction waste and dust in the exposed environment is very easy to become the culprit of haze. Coupled with the flow of traffic and the agitation of people, building dust floating in the air, the formation of fog haze.

In addition, extensive waste treatment is also one of the reasons for the formation of haze.

In the winter, the thermal company to protect the public heating. However, the current system of heat is mostly coal combustion to produce heat. Incomplete combustion of dust and the discharge of sulphur gas are also the cause of haze weather.

Under normal climatic conditions, the pollutant diffuses from high altitude to low air temperature, and gradually discharges into the atmosphere, and the low temperature is lower, which causes the pollutant to stay and can not be discharged in time.

Fog or haze is a kind of disastrous weather, which has important influence on highway, railway, aviation, shipping, power supply system and crop growth. Fog, haze will cause air quality decline, affect the ecological environment, the health of the human body to bring greater harm.

When fog and haze weather, the air often carries the bacterium and the virus, easily causes the infectious disease to spread and many kinds of diseases occur. Air pollutants in cities are not easy to spread and aggravate the toxicity of sulphur dioxide, carbon monoxide, nitrogen oxides and other substances, which endanger human health.

In the winter fog, haze weather, if the air pollution is serious may form soot or black smoke and other cloud, serious threat to human life and health. The haze is harmful to the human body after inhaling the respiratory tract of everyone.

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