Aerosol optical thickness

This post contains formulas! Aerosols play a great role in the atmospheric effects.

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Aerosol optical thickness

They are provided on the NEO web site as 1-day measurements and 8-day and 1-month composites. There are many applications for aerosol optical thickness data: " 1 Atmospheric correction of remotely sensed surface features 2 Monitoring of sources and sinks of aerosols 3 Monitoring of volcanic eruptions and forest fire 4 Radiative Transfer Model 5 Air Quality 6 Health and Environment 7 Earth Radiation Budget 8 Climate Change" 1 "Aerosol particles are important to scientists because they represent an area of great uncertainty in their efforts to understand Earth's climate system. Depending upon their size, type, and location, aerosols can either cool the surface, or warm it. They can help clouds to form, or they can inhibit cloud formation. And if inhaled, aerosols can be harmful to people's health. This data can be used to teach or learn the following topics and skills in introductory Earth science:. The data range from measurements of 0 to measurements of 1. The Terra satellite began measuring this parameter in August These daily "data are produced at the spatial resolution of a The NEO interface makes it very easy to access data. From there, select the month of interest. For example, the data from two satellite images can be compared directly by plotting a transect plotting data along a path across an area of interest, creating a graph of data values along the transect. If a summary an average of the data in a particular area is desired, users can create polygon and the mean value within the polygon is then instantly calculated. Scatter plots and other 2- and 3-dimensional graphics are easily created. NEO offers a variety of data exploration and analysis tools including simple visual exploration, visualization of graphical displays of the data, mathematical combinations of two or three data sets, and time-series animation.

This provides two equations for estimating the type of aerosol optical thickness. For planetary ringsthe optical depth is the negative logarithm of the proportion of light blocked by the ring when it lies between the source and the observer. Mishchenko, aerosol optical thickness, M.

Tiny solid and liquid particles suspended in the atmosphere are called aerosols. Windblown dust, sea salts, volcanic ash, smoke from wildfires, and pollution from factories are all examples of aerosols. Depending upon their size, type, and location, aerosols can either cool the surface, or warm it. They can help clouds to form, or they can inhibit cloud formation. And if inhaled, some aerosols can be harmful to people's health.

The aerosol quantity determined by most instruments is the aerosol optical depth AOD. This is related to the amount of light aerosols scatter or absorb in a column through the atmosphere specifically, it is the vertically-integrated aerosol extinction , and is also sometimes referred to as aerosol optical thickness AOT. AOD depends on wavelength; a common reference wavelength reported by satellite data products is nm. This is related to the aerosol particle size. Roughly speaking , values less than 1 suggest an optical dominance of coarse particles e. For health purposes, people are often interested in the mass of aerosols of a certain size at ground level. This is often referred to by the term 'particulate matter' PM and separated by size. Terms such as PM 1 , PM 2.

Aerosol optical thickness

In the maps shown here, dark brown pixels show high aerosol concentrations, while tan pixels show lower concentrations, and light yellow areas show little or no aerosols. Black shows where the sensor could not make its measurement. Aerosol optical depth is the degree to which aerosols prevent the transmission of light by absorption or scattering of light. Tiny solid and liquid particles suspended in the atmosphere are called aerosols. Examples of aerosols include windblown dust, sea salts, volcanic ash, smoke from fires, and pollution from factories.

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Effects of sources, transport, and postdepositional processes on levoglucosan records in southeastern Tibetan glaciers. The North China Plain is one of the most polluted region of the country, characterized by gradual increase of AOD values from January 0. Also in summer months we observe domination of secondary fine particles, formed in the process of photochemical reactions at high temperatures and high humidity. Temporal and spatial variation of particulate matter and its correlation with other criteria of air pollutants in Lanzhou, China, in spring-summer periods. This study used cloud-screened and quality-assured level 2. References : Chavez Jr, P. Further studies should be aimed at improvement of identification and investigation of quantitative estimation of natural and anthropogenic activity contribution into the total aerosol volume. Trends of visibility on sunny days in China in the recent 50 years. Sorry, a shareable link is not currently available for this article. Environmental Science and Pollution Research Yes, aerosols may vary within an image, for instance in mountains where valleys may be hazy while the summits are clear, or near the aerosol source. Correspondence to Mikalai Filonchyk or Haowen Yan. Aerosol contamination survey during dust storm process in Northwestern China using ground, satellite observations and atmospheric modeling data.

Tiny solid and liquid particles suspended in the atmosphere are called aerosols. Windblown dust, sea salts, volcanic ash, smoke from wildfires, and pollution from factories are all examples of aerosols. Depending upon their size, type, and location, aerosols can either cool the surface, or warm it.

Long-term — evolution and trend in Collection 5. Thank you. Pahlevan et al. Slope, which is greater or less than unity, indicates the likelihood of some inconsistency between aerosol models, used in retrieval algorithm, and a real model In atomic physics , the spectral optical depth of a cloud of atoms can be calculated from the quantum-mechanical properties of the atoms. IEEE Geosci. Climatol , 1—2 , — NEO offers a variety of data exploration and analysis tools including simple visual exploration, visualization of graphical displays of the data, mathematical combinations of two or three data sets, and time-series animation. Zhuang, B. Google Scholar Luo, Y. Google Scholar Zhang, Z. Nevertheless, AOD data, obtained with different instruments, were similar in the majority of the areas under study. Other important factors, affecting data generation, are meteorological parameters 12 , 45 , 53 , underlying terrain 26 , 40 , 43 , 48 , cloud cover 31 , 73 , 74 , various anthropogenic effects biomass combustion, industrial emissions, construction activities, and etc. To understand how this method works, one must already understand the effects of aerosols on radiation. Journal of Environmental Studies and Sciences