text: This paper presents a preliminary work to estimate the variations of ground albedoes in Africa. The data are Meteosat images in visible and infrared channels for January and April 1982. The compositing of the images is used to approach at the best the clear sky conditions. These composite images can also help to detect the extension of the humid air penetration over Africa. The basic assumption is that at north of this area the atmospheric effects on the visible channel remained constant from one month to another. Then a simple histogram method is used for the comparison over the chosen areas between January and April in the visible channel. Only the effect on reflection of solar zenith angle has been taken into account.
  We have investigated with our general circulation model the effect of an increase of surface albedo over the Sahel on climate. When albedo increases, the precipitation and evaporation rates are lower. Our experiment also has shown variations of zonal circulation over the Sahel: the Tropical Easterly Jet is stronger and easterlies at low altitude are weaker when the precipitation rate is higher. These results, in agreement with observations of the changes of circulation between dry and wet years, suggest that the albedo can play an important role in the triggering or the maintenance of a drought in the Sahel through the effects of circulation.
  
  Demonstrating that you not only understand the opposition’s point, but that your argument is strong enough to withstand it, is one of the key pieces to a successful argumentative essay. All rights reserved.
  Both essay styles rely on well-reasoned logic and supporting evidence to prove a point, just in two different ways. Should drug possession be decriminalized? Should books with objectionable words be banned? SAT® is a registered trademark of the College Entrance Examination BoardTM. Should vaccinations be required for students to attend public school? Should coaches and players make the same amount of money?
  If you’re interested and feel passionate about the topic you choose, you'll have an easier time finding evidence to support it, but it's the evidence that's most important. Don’t explain all your evidence in the opening, but do take a strong stance and make it clear what you’ll be discussing. How Do You Write a Rogerian Argument Essay? In this case, your thesis is a statement of your position on a specific controversial topic. The College Entrance Examination BoardTM does not endorse, nor is it affiliated in any way with the owner or any content of this site.
  Give them some background information, such as a brief history of the issue or some additional context.
  To write an effective argumentative essay, you need to know what a good one looks like. Avoid emotional language that can sound irrational. You’ll need to develop a good argument, which encompasses not just your main point, but also all the pieces that make it up.
  When you’re crafting an argument, it can be easy to get distracted by all the information and complications in your argument. Essay service review is one of the best methods to help you find the best essay writers to take your project for hire. Once you've given yourself a solid foundation of information, begin to craft your essay.
  If you are trying to write an argumentative essay, the purpose of your paper is to present one side of an argument.
  For the free lunch idea, you could suggest that some students have to go hungry because they can’t afford lunch, that funds could be diverted from other places to support free lunch, and that other items, like chips or pizza, could be sold to help make up lost revenue.
  Grace Fleming, M.Ed., is a senior academic advisor at Georgia Southern University, where she helps students improve their academic performance and develop good study skills. The Toulmin model is the most common, comprised of an introduction with a claim (otherwise known as a thesis), with data to support it. Use a mix of evidence, from statistics to other studies and anecdotal stories. For the weed killer ban, you could say that weed killer has been proven to have adverse impacts on bees, that there are simple, natural alternatives, and that weeds aren’t actually bad to have around.