Maritime polar maritime polar mpmp air masses air masses maritime polar air masses form over upppp ger latitude oceanic regions and are cool and moist. An air mass is a large volume of air in the atmosphere that is mostly uniform in temperature and moisture. Air masses are huge parcels of air with specific characteristics. The air mass and fronts power point provides a detailed description of the characteristics of air masses and cold, warm, occluded, and stationary fronts. The air with distinctive characteristics in terms of temperature and humidity is called an air mass. Label the cold and warm air masses shown in the diagram to the right of a cold front. Contain uniform temperature and humidity characteristics. On the bottom table, they are tasked with using the associated images on the next page, in addition to their notes the air mass names are also listed on page of their earth science. Air masses, fronts, pressure systems notes youtube. If there are different air masses on either side of the front, there may also be a dewpoint gradient. Notes,whiteboard,whiteboard page,notebook software,notebook, pdf,smart,smart technologies ulc,smart board interactive whiteboard. Topicair masses,fronts and cyclone important for upsc201820192020 geography optional class 11 duration. The warm, moist air might dominate an area hundreds of miles across, while in another part of the continent a cold, dry air mass holds sway over an equally large region.
Some mp air masses originate from the north atlantic and move southwestward toward the northeast states. Warm air molecules rise, move faster, are less dense, and have more ene. Air masses are also classified according to the surface over which they form. Air masses that pass over cooler land areas will be cooled at the lowest levels and stability will occur. Copyright 2007 the storm project 1 activity 12 air masses level.
Lecture notes for chapter 12 air masses and fronts. Air masses doodle notes are for the middle school science classroom. For each front a visual, description, and time for students to act out the front is provided. Weather and climate the structure of the atmosphere surrounding the earth is a gaseous envelope or atmosphere, held in place by the planets gravitational attraction.
Superposition fossil activity ppt law of superpositionfossils. An educators resource for inquirybased learning for grades 59 is written as a supplement to existing earth and space science curricula for grades 59. Air masses describe large areas of air with similar temperature, pressure, and humidity. Note with the warm, we will also have continental and maritime, although its going to be tropical and tropical. Air masses form over large surfaces with uniform temperatures and humidity, called source regions. Continental polar cp air mass continental polar air masses form over large, highlatitude land masses, such as northern canada or siberia. Air mass air masses form over areas with 1 uniform underlying surface properties and 2 high surface pressure, where divergence of surface winds decreases contrasts in temperature and humidity. These notes will assist students as they learn about how. An air mass is a large body of air, whose properties temperature, humidity air moisture and lapse rate are largely uniform the same over an area several hundred kilometers across the regions where air masses form are referred to as air mass source regions. In this activity adapted from living by chemistry unit 3 weather 2012 w. For example, a cold front demarcates the leading edge of a cold air mass displacing a warmer air mass. Analyze and interpret weather data to explain the effects of moisture evaporating from the ocean on weather patterns and weather events such as hurricanes. An air mass is any mass of air or large amount or large body of air where a temperature and the moisture content are about the same throughout. Air masses and fronts geogenst 2331 lecture 16 ahrens.
Eighth grade lesson air masses and fronts betterlesson. The leading edge of the cold airmass typically has a shape like a dome, as shown in the figure. Homogeneous area can be vast plains or oceans where only little horizontal variation occurs in temp. Air masses that form at low latitudes are tropical t air masses. It should be used in conjunction with lectures, discussions, textbooks. Weather observation and analysis john nielsengammon course notes these course notes are ed. Fronts fronts are the boundaries between two air masses.
Instead, they form a front, usually hundreds of miles long. Polar air masses, containing little moisture and low temperatures move downward from the poles. Colder air masses can warm, warmer air masses can cool. Polar maritime air is the most common type of air mass affecting the british isles. A front of air masses that move either very slowly or not at all. This is a journey to the very edge of existence, where the air is thin and the chances of survival are slim. The guide may be used in both formal and informal educational settings as well as at home. Air masses a large body of air with similar properties all through it bringing in weather most important properties are temperature and water vapor the kind of weather you have depends on the type of air mass in your area and air masses move due to wind at the edge of an air mass, storms may occur two types of air masses. Airmasses an airmass is a large body of air with relatively uniform thermal and moisture characteristics. Oceans add heat and moisture into the dry and cold cp air. Atmosphere air masses, fronts, cyclones, anticyclones. C11air masses,cloudscumulonimbus,nimbostratus,fronts upsc iasstationary, cold,warm.
Use these lesson plans to make the movie come to life for your students to help explore themes around weather, layers. The aeronauts follows widow amelia wren jones and scientist james glaisher redmayne, as they mount a balloon expedition to fly higher than anyone in history. On the notes section on the second page of the air masses resource, students assemble those notes by briefly filling in the table at the top of the page. The homogenous regions can be the vast ocean surface or vast plains and plateaus. An air mass acquires its distinctive characteristics in a source region where there is a large and fairly uniform. Air mass source regions range from extensive snow covered polar areas to deserts to tropical oceans. Air masses in lesson 3, we will be looking at air masses and their affect on weather. Redistribution of these course notes, whether done freely or for. Fronts represent fairly abrupt transitions between two large air masses.
Air masses are slowly pushed along by highlevel winds, when an air mass moves over a new region, it shares its temperature and humidity with that region. Air masses greatly influence the the weather in a location. Air masses can extend thousands of kilometers across the surface of the earth, and can reach from ground level to the stratosphere16 kilometers 10 miles into the atmosphere. When air masses are modified, they are renamed according. Complete the chart by filling in the missing information about each type of front.
Air masses that form over tropical regions are warm. These air masses originate over the snowcovered interior regions of canada and alaska. Dynamic processes cover a large range of scales from the microscopicscale. Explain why a cold air mass wedges under a warm air mass. The earths atmosphere is a complex dynamical, physical, and chemical system. The latter air mass generally is colder and drier than the mp air off the pacific. Label the four types of air masses on the map below by filling in the boxes. Most weather occurs along the periphery of these air masses at boundaries called fronts. Interaction of air masses richmond county school system. Lecture 18 air masses and fronts school of ocean and. Homogeneous regions over which air masses form are called.
As the front nears, the clouds will become lower in the sky and be thicker, since. The weather in new york is most influenced by two air masses. So the temperature and humidity of a particular location depends partly on the characteristics of the air mass that sits over it. Label the cold and warm air masses shown in the diagram to the right of a warm front.
Atmosphere air masses, fronts, cyclones, anticyclones air masses over a homogeneous area, when air remains for a sufficiently long time, it acquires the characteristics of that area. Students will learn and become familiar with the four air masses. Case studies of air masses using wow teachers notes. Air mass air masses based on source regions pmf ias. Air masses coming from colder areas are labeled as polar p, whereas tropical masses t come from warm regions. Topography can play a crucial role in the modification of air masses. It has the some temperature and moisture throughout. When large masses of warm air and cold air meet, they do not mix. It is a large body of air having little horizontal variation in temperature and. Which air masses are most important to us in new york. The cold air mass are then further divided into continental polar and maritime polar.
If the source region is over the ocean, it is moist and labeled as maritime m. Air moves from areas of high pressure to low pressure, which are caused by the uneven heating of the earth air masses. As an air mass moves away from its source region it influences what it moves over, but is also influenced by the land it moves over. Wintertime cooling over these land areas cause the atmosphere to become very stable even inversion. Air masses that form over water are generally moist, and those that form over the tropical oceans are both moist and warm. Air masses that come from tropical places will be warm, while air masses that come from polar places will be cool. Air masses when the air remains over a homogenous area for a sufficiently longer time, it acquires the characteristics of the area. Airmasses cover large regions of the earth, typically. A warm air mass that forms over the caribbean sea is a maritime tropical air mass. Air originating from over land is called continental c. Use blue to represent cool air and red to represent warm air. When two large air masses meet, the boundary that separates them is called a front. The united states is not a favorable source region.
A warm front is the leading edge of a warmer air mass replacing a colder air mass. The weather an air mass brings is determined by the region it has come from and the type of surface it has moved over. Because of the coriolis effect due to the earths rotation, air masses generally move across north america from west to east. Air masses that form over dry land are tropical air masses. The first signs of an approaching warm front are the appearance of high, thin, wispy cirrus clouds. These notes allow for creativity and a visual representation of the concepts. Air masses are distinguished by one of four source characteristics. Air mass modification air masses can be modified significantly as they pass over regions with different characteristics.
1261 184 667 1321 1251 274 1346 160 949 1313 606 691 238 1166 704 442 335 1493 526 492 1206 1091 1601 416 714 108 1466 869 310 200 342 1470 1324 1158 332 348 1039 965 1120 1189 561 882 1112