Section 3 Climates of the World\'s DesertsSlide 2
Some General Properties Meteorological qualities Surface attributes Vegetation attributesSlide 3
Variety of Properties Cold deserts and hot Deserts with winter precipitation and deserts with summer precipitation and deserts with for all intents and purposes no precipitation Perpetually foggy forsakes and abandons with close to the most extreme conceivable daylight Barren deserts and vigorously vegetated deserts Sand-hill betrays and leaves with rough fieldsSlide 4
Summary of Meteorological Characteristics (Then we\'ll cover physiographic and vegetation attributes)Slide 5
Desert Climate TypesSlide 6
Warm Versus Cold DesertsSlide 9
Daily aggregate sunlight based vitality got at top of environment on even surface COLD DESERT WARM DESERTSlide 10
Climate % parched terrains 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 10-30 Northern Sahara Atacama Mojave Cold Winter 24 <0 10-30 Canadian Prairie Gobi Turkestan Deserts of China Great BasinSlide 11
Coastal/Foggy Desert Summer temperatures are not particularly high, but rather the winters are not frosty on the grounds that the sea is close Can be exceptionally awkward in light of high stickinessSlide 13
Temperature (strong) and Relative Humidity (dashed), at Different Distances From Namib Desert Coast FOG 30 km from drift 5 km from drift Far inlandSlide 14
Seasonality of Precipitation (a few/none of each)Slide 20
A Closer LookSlide 22
Rule of Thumb Summer precip on Equatorial side Winter precip on mid-scope sideSlide 23
Desert Temperature Why is it high? Absence of dissipation from surface Lack of vegetation (transpiration) Not much overcast coverSlide 24
Cloud CoverSlide 25
Desert Winds Subtropical deserts -High weight ranges are by and large characterized by feeble winds -Thunderstorms can create high winds -Mid-scope aggravations (lows) with high winds can infiltrate into deserts Cold forsakes in mid-scopes, encounter mid-scope tornados (lows) that can have solid winds Lack of vegetation – close surface winds higher Winds are exceptionally drying up – high temperature combined with high windsSlide 26
Desert Humidity Relative stickiness can be as low as a couple percent, or as high as 100% (foggy waterfront leave) Specific moistness Compared to hot damp tropics, betray air is drier But abandon quality of 95 F and 15% RH has more water vapor than does immersed air at 32 F in a winter stormSlide 28
Humidity Calculations Use the table on the past slide to discover vapor weight, immersion vapor weight, and relative dampness for: Temperature = 38 C, Dew point = 7 C Temperature = - 1 C, Dew point = - 4 C Which area is more muggy? It relies on upon how you characterize humidity!!!!Slide 29
Desert Humidity Compare the relative and outright stickiness of a forsake and winter storm Desert 95 F and 15% RH Find dew point temperature for these conditions Winter storm 32 F and 100% RH Find dew point temperature for these conditions Which area is more damp?Slide 30
General Physiographic Characteristics (Why do we mind in a meteorology course?)Slide 31
Types Sand "sheets" and sand rises Bare level shake "Forsake asphalt" – framework of stones solidified together at first glance Salt pads Large shakes and mountains Clay fieldsSlide 33
Northern Chihuahuan DesertSlide 37
Areas With Interior DrainageSlide 38
General Vegetation CharacteristicsSlide 39
Vegetation Types Small trees Shrubs Succulents Grasses Herbs LichensSlide 40
Vegetation Types That are Adapted to Desert Conditions Phreatophyte – long roots Xerophyte – instruments for rationing water Halophytes – adjusted to saline soils Psammophytes – develop in sandy soils Therophytes (annuals) – seeds stay lethargic in soil amid dry season or dry years (diverge from enduring)Slide 41
Landscape Types in Terms of Vegetation Steppes – prairie without trees, for the most part in midlatitudes Savannas – additionally open meadow, yet there are scattered bushes and trees (subtropical, speaking to a move between tropical woodlands and meadow of dry zones)Slide 42
The Deserts of AfricaSlide 43
African DesertsSlide 44
Orography of the Sahara and SahelSlide 45
Large-Scale Weather Patterns of the Sahara and SahelSlide 46
Climate of the Horizontal Wind and Sea-level PressureSlide 47
Penetration of Monsoon and Frontal PrecipitationSlide 48
Monthly PrecipitationSlide 49
Maximum Observed 24-h Precipitation (mm)Slide 50
Maximum Observed Annual Precipitation (mm)Slide 51
Budyko Index (Aridity)Slide 52
Annual Cloudiness (%)Slide 53
Record Maximum TemperatureSlide 54
Record Minimum TemperatureSlide 55
Mean Diurnal Temperature RangeSlide 56
Annual Range of Daily Mean TemperatureSlide 57
Orography of Southwestern AfricaSlide 58
Budyko Index (Aridity)Slide 59
Temperature Anomaly (C), SummerSlide 60
Monthly PrecipitationSlide 61
Cross Section of Southern AfricaSlide 62
Orography of the Horn of AfricaSlide 63
The Budyko Index (Aridity)Slide 64
Monthly PrecipitationSlide 65
The Deserts of North AmericaSlide 67
Monthly PrecipitationSlide 68
Orography of North AmericaSlide 69
The Budyko Index (Aridity)Slide 70
The Deserts of South AmericaSlide 72
Orography of Western South AmericaSlide 73
Monthly PrecipitationSlide 74
Orography of Southern South AmericaSlide 75
Monthly PrecipitationSlide 76
Budyko Index (Aridity)Slide 77
Australian DesertsSlide 79
Orography of AustraliaSlide 80
Budyko Index (Aridity)Slide 81
Monthly PrecipitationSlide 82
Seasonal Distribution of PrecipitationSlide 83
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