advertisement

World's Deserts

75 %
25 %
advertisement
Information about World's Deserts
Entertainment

Published on September 24, 2008

Author: aSGuest169

Source: authorstream.com

advertisement

Chapter 3 : Chapter 3 Climates of the World’s Deserts Some General Properties : Some General Properties Meteorological characteristics Surface characteristics Vegetation characteristics Variety of Properties : Variety of Properties Cold deserts and hot deserts Deserts with winter precipitation and deserts with summer precipitation and deserts with virtually no precipitation Perpetually foggy deserts and deserts with near the maximum possible sunshine Barren deserts and heavily vegetated deserts Sand-dune deserts and deserts with rocky plains Summary of MeteorologicalCharacteristics (Then we’ll cover physiographic and vegetation characteristics) : Summary of MeteorologicalCharacteristics (Then we’ll cover physiographic and vegetation characteristics) Desert Climate Types : Desert Climate Types Warm Versus Cold Deserts : Warm Versus Cold Deserts Daily total solar energy received at top of atmosphere on horizontal surface : Daily total solar energy received at top of atmosphere on horizontal surface COLD DESERT WARM DESERT Slide 8: Climate % arid lands Coldest mo Warmest mo Examples Hot 43 10-30 >30 Central Sahara Great Sandy (Aust) Mild Winter 18 10-20 10-30 Southern Sahara Kalahari Mexico Deserts Simpson (Aust) Cool Winter 15 0-10 10-30 Northern Sahara Atacama Mojave Cold Winter 24 <0 10-30 Canadian Prairie Gobi Turkestan Deserts of China Great Basin Coastal/Foggy Desert : Coastal/Foggy Desert Summer temperatures are not especially high, but the winters are not cold because the ocean is close Can be very uncomfortable because of high humidity Temperature (solid) and Relative Humidity (dashed), at Different Distances From Namib Desert Coast : Temperature (solid) and Relative Humidity (dashed), at Different Distances From Namib Desert Coast 5 km from coast 30 km from coast Far inland FOG Precipitation : Precipitation Seasonality of Precipitation : Seasonality of Precipitation (some/none of each) A Closer Look : A Closer Look Rule of Thumb : Rule of Thumb Summer precip on Equatorial side Winter precip on mid-latitude side Desert Temperature : Desert Temperature Why is it high? Lack of evaporation from surface Lack of vegetation (transpiration) Not much cloud cover Desert Winds : Desert Winds Subtropical deserts - High pressure areas are generally characterized by weak winds - Thunderstorms can produce high winds - Mid-latitude disturbances (lows) with high winds can penetrate into deserts Cold deserts in mid-latitudes, experience mid-latitude cyclones (lows) that can have strong winds Lack of vegetation – near-surface winds higher Winds are very desiccating – high temperature coupled with high winds Desert Humidity : Desert Humidity Relative humidity can be as low as a few percent, or as high as 100% (foggy coastal desert) Specific humidity Compared to hot humid tropics, desert air is drier But desert air of 95 F and 15% RH has more water vapor than does saturated air at 32 F in a winter storm General Physiographic Characteristics(Why do we care in a meteorology course?) : General Physiographic Characteristics(Why do we care in a meteorology course?) Types : Types Sand “sheets” and sand dunes Bare flat rock “Desert pavement” – matrix of pebbles cemented together on the surface Salt flats Large rocks and mountains Clay plains Slide 21: Mojave Slide 23: Northern Chihuahuan Desert Areas With Interior Drainage : Areas With Interior Drainage General Vegetation Characteristics : General Vegetation Characteristics Vegetation Types : Vegetation Types Small trees Shrubs Succulents Grasses Herbs Lichens Vegetation Types That are Adapted to Desert Conditions : Vegetation Types That are Adapted to Desert Conditions Phreatophyte – long roots Xerophyte – mechanisms for conserving water Halophytes – adapted to saline soils Psammophytes – grow in sandy soils Therophytes (annuals) – seeds remain dormant in soil during dry season or dry years (contrast with perennial) Landscape Types in Terms of Vegetation : Landscape Types in Terms of Vegetation Steppes – grassland without trees, generally in midlatitudes Savannas – also open grassland, but there are scattered shrubs and trees (subtropical, representing a transition between tropical forests and grassland of arid areas) The Deserts of Africa : The Deserts of Africa African Deserts : African Deserts Orography of the Sahara and Sahel : Orography of the Sahara and Sahel Large-Scale Weather Patterns of the Sahara and Sahel : Large-Scale Weather Patterns of the Sahara and Sahel Slide 34: Climate of the Horizontal Wind and Sea-level Pressure Penetration of Monsoon and Frontal Precipitation : Penetration of Monsoon and Frontal Precipitation Monthly Precipitation : Monthly Precipitation Maximum Observed 24-h Precipitation (mm) : Maximum Observed 24-h Precipitation (mm) Maximum Observed Annual Precipitation (mm) : Maximum Observed Annual Precipitation (mm) Budyko Index (Aridity) : Budyko Index (Aridity) Annual Cloudiness (%) : Annual Cloudiness (%) Record Maximum Temperature : Record Maximum Temperature Record Minimum Temperature : Record Minimum Temperature Mean Diurnal Temperature Range : Mean Diurnal Temperature Range Annual Range of Daily Mean Temperature : Annual Range of Daily Mean Temperature Orography of SouthwesternAfrica : Orography of SouthwesternAfrica Budyko Index (Aridity) : Budyko Index (Aridity) Temperature Anomaly (C), Summer : Temperature Anomaly (C), Summer Monthly Precipitation : Monthly Precipitation Cross Section of Southern Africa : Cross Section of Southern Africa Orography of the Horn of Africa : Orography of the Horn of Africa The Budyko Index(Aridity) : The Budyko Index(Aridity) Monthly Precipitation : Monthly Precipitation The Deserts of North America : The Deserts of North America Monthly Precipitation : Monthly Precipitation Orography of North America : Orography of North America The Budyko Index (Aridity) : The Budyko Index (Aridity) The Deserts of South America : The Deserts of South America Orography of Western South America : Orography of Western South America Monthly Precipitation : Monthly Precipitation Orography of Southern South America : Orography of Southern South America Monthly Precipitation : Monthly Precipitation BudykoIndex (Aridity) : BudykoIndex (Aridity) Australian Deserts : Australian Deserts Orography of Australia : Orography of Australia Budyko Index (Aridity) : Budyko Index (Aridity) Monthly Precipitation : Monthly Precipitation Seasonal Distribution of Precipitation : Seasonal Distribution of Precipitation Asian Deserts : Asian Deserts

Add a comment

Related presentations

Related pages

List of deserts by area - Wikipedia

List of deserts by area It has been suggested that this ... It includes all deserts with an area greater than 52,000 square kilometres (20,100 sq mi).
Read more

Principal Deserts of the World - Infoplease

Principal Deserts of the World. Deserts are arid regions, generally receiving less than ten inches of precipitation a year, or regions where the potential ...
Read more

Top Ten Largest Deserts in the World - Maps of World

The map below shows the locations of the ten largest deserts in the world, including the Sahara Desert and the Arabian Desert.
Read more

Deserts of the World | The 7 Continents

Our expansive list of the deserts of the world. Exlpore the desert of the world map with information on each subtropical, cool, coastal, and artic desert.
Read more

Largest Desert in the World - Desert Map - Geology

The World's Largest Deserts A map showing the generalized location of Earth's ten largest deserts and a table of over 20 major deserts. World desert map: ...
Read more

Deserts of the World Map

World desert map highlighting all the deserts of different continents. The main deserts of the world are Sahara, Kalahari etc
Read more

Desert - Wikipedia

The world's largest non-polar deserts. ... Antarctica is the world's largest cold desert (composed of about 98% thick continental ice sheet and 2% barren ...
Read more

Principal Deserts of the World - Fact Monster

Principal Deserts of the World. Deserts are arid regions, generally receiving less than ten inches of precipitation a year, or regions where the potential ...
Read more

Atlas of the World's Deserts: ebook jetzt bei weltbild.de

eBook Shop: Atlas of the World's Deserts als Download. Jetzt eBook sicher bei Weltbild runterladen & bequem mit Ihrem Tablet oder eBook Reader lesen.
Read more

The Desert Biome - UCMP

Mammals are usually small, like the kangaroo mice of North American deserts. Desert biomes can be classified according to several characteristics.
Read more