Chapter 4: Siberian high Flashcards Preview

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Flashcards in Chapter 4: Siberian high Deck (19)
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1
Q

Siberian high: 

A
  • 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
2
Q

Siberian high is centered on:

A

Lake Baikal 

3
Q

Siberian high reaches its greatest size and strength in:

A
  • Winter when air temperature near the center is lower than -40 C
  • Pressure is above 1040 mb
4
Q

Siberian high is responsible for:

A
  • 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 
5
Q

What happens to Siberian high during summer?

A
  • Replaced by the Asiatic low
    • Indian thermal low
6
Q

Siberian high affects: (how for it extends)

A
  • 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
7
Q

Strong Siberian high affects:

A
  • 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 
8
Q

Siberian air characteristics:

A
  • 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
9
Q

Siberian high build up, peak and decay:

A
  • Build up at the end of august
  • Reaches its peak in winter
  • Remain strong until the end of April
10
Q

Genesis of Siberian high:

A
  • 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
11
Q

Warmer winters are caused by:

A

Weakening of the Siberian high

12
Q

Warmer winters are noted in:

A
  • 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
13
Q

Relationships between parameters and Siberian high:

A
  • Precipitation and Siberian high
  • Pressure system and Siberian high
  • Arctic oscillation and Siberian high
14
Q

Precipitation and Siberian high:

A
  • 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 
15
Q

Pressure systems and Siberian high:

A

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

16
Q

Arctic oscillation and Siberian high:

A

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

17
Q

Blocks:

A
  • 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
18
Q

Blocks are also known as:

A
  • Blocking high
  • Blocking anticyclones 
19
Q

Blocks occur most frequently in:

A

Spring over the eastern pacific and Atlantic oceans.