Chapter 4: Siberian high

Question 1

Siberian high:

Answer 1

• A massive collection of cold dry air that accumulates in the northeastern part of Eurasia from September until April.
• Strongest semi-permanent high in the NH

Question 2

Siberian high is centered on:

Answer 2

Lake Baikal

Question 3

Siberian high reaches its greatest size and strength in:

Answer 3

• Winter when air temperature near the center is lower than -40 C
• Pressure is above 1040 mb

Question 4

Siberian high is responsible for:

Answer 4

• The lowest temperature in NH -67.8 C
• Highest pressure 1083.8 mb
• Severe cold winter
  
  • Cold coastal winter in the Pacific Russia in relation to its:
    
    • Latitude
    • Proximity to the ocean
• Attendant dry conditions with little snow
• A few or no glacier across
  
  • Siberia
  • Magnolia
  • China

Question 5

What happens to Siberian high during summer?

Answer 5

• Replaced by the Asiatic low
  
  • Indian thermal low

Question 6

Siberian high affects: (how for it extends)

Answer 6

• Its influence extends as far west as Italy
• As far southeast as Malaysia
  
  • Critical to northeast monsoon
    
    • Responsible for formation of winter monsoon over south- west Asia

Question 7

Strong Siberian high affects:

Answer 7

• Bring cold weather into tropics
  
  • As far southeast as Philippines
  • As far east as eastern Canada
• Block or reduce the size of lower pressure cells
• Generate dry weather across Asian landscape
  
  • With exception of regions that receive orographic rainfall from winds it generates, such as:
    
    • Hokuriku
    • Caspian sea coast of Iran

Question 8

Siberian air characteristics:

Answer 8

• Colder than arctic air
  
  • Because it forms over the cold tundra of Siberia
    
    • Does not radiate heat the same way the ice of the arctic does

Question 9

Siberian high build up, peak and decay:

Answer 9

• Build up at the end of august
• Reaches its peak in winter
• Remain strong until the end of April

Question 10

Genesis of Siberian high:

Answer 10

• Genesis at the end of the arctic summer
• Caused by the convergence of summer air flows
  
  • Flows are cooled over interior northeast Asia as days shorten
• Upper level het is transferred across northern Eurasia by:
  
  • Adiabatic cooling
  • Descending advection
  • In extreme cases creates cold domes that outbreak over warmer parts of east Asia

Question 11

Warmer winters are caused by:

Answer 11

Weakening of the Siberian high

Question 12

Warmer winters are noted in:

Answer 12

• Almost all of inland extra tropical Asia
• Most parts of Europe
• Strongest relationship over
  
  • West Siberian plain
  • As far west as:
    
    • Hungary
  • As far southeast as:
    
    • Guangdong

Question 13

Relationships between parameters and Siberian high:

Answer 13

• Precipitation and Siberian high
• Pressure system and Siberian high
• Arctic oscillation and Siberian high

Question 14

Precipitation and Siberian high:

Answer 14

• Precipitation inversely related to the mean central pressure of the Siberian high over
  
  • Eastern Europe during boreal winter
  • Southern chine
• Opposite correlation over
  
  • Coromandel coast
  • Sri Lanka

Question 15

Pressure systems and Siberian high:

Answer 15

Strength of Siberian high inversely related with the high pressure system over North Africa

Question 16

Arctic oscillation and Siberian high:

Answer 16

Weaker Siberian high and arctic oscillation when the Antarctic oscillation (AAO) is stronger

Question 17

Blocks:

Answer 17

• Large scale patterns in atmospheric pressure field
• Nearly stationary
  
  • Remain in place for several days or even weeks
    
    • Causing the areas affected to have the same weather for a long period of time
• Effectively blocking
• Redirecting migratory cyclones

Question 18

Blocks are also known as:

Answer 18

• Blocking high
• Blocking anticyclones

Question 19

Blocks occur most frequently in:

Answer 19

Spring over the eastern pacific and Atlantic oceans.