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Oscillation Patterns in RegCM4 Contents Teleconnections & - - PowerPoint PPT Presentation

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C LIMATE R ESEARCH IN THE D EPARTMENT OF P HYSICS J. Ciarlo`, M ALTA C LIMATE T EAM 14-19 th March 2011 How Oscillation Patterns effect one another How Oscillation Patterns effect aerosol transport Oscillation Patterns in RegCM4 Contents

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CLIMATE RESEARCH IN THE DEPARTMENT OF PHYSICS

  • J. Ciarlo`, MALTA CLIMATE TEAM

14-19th March 2011

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How Oscillation Patterns effect one another How Oscillation Patterns effect aerosol transport Oscillation Patterns in RegCM4

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Contents

 Teleconnections & Oscillation Patterns  Aerosols & Transportation  Patterns, Indices & the Domain  Measured Data  Teleconnection Analysis

 From Measured Data  RegCM4  Aerosol Transport

 Conclusions

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Teleconnections & Oscillation Patterns

 Teleconnection:

 Two or more distant points of air pressure – “nodes”  Icelandic Low – 3600 km – Azores High  Strong Negative Relationship

 Oscillation Pattern:

 The teleconnection as a whole, varies almost in an oscillating

manner.

 The North Atlantic Oscillation (NAO)

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Aerosols & Transportation

 Aerosols:

 Solid and Liquid particles suspended in air.

 Transportation:

 Movement of particles through air motion.

 Air Movement:

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Low Pressure Centre High Pressure Centre Hot Air Cold Air

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Patterns, Indices & the Domain

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Patterns, Indices & the Domain

Indices quantify the state of a Pattern

 Difference in pressure at sea level (or geopotential

height at pressure level).

 The difference is standardized with long term

monthly means.

 Result: Index value varying from +3 to -3.

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Patterns, Indices & the Domain

The influence of Oscillation Patterns

 Example: The North Atlantic Oscillation

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NAO+ NAO-

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Measured Data

Sea Level Pressure Higher Altitude Pressure

 Used to extract pressure values for the nodes to construct

Oscillation Indices. u-wind – wind component in the west to east direction. v-wind – wind component in the south to north direction.

 Necessary for studying wind vectors & understanding wind

motion.

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Teleconnection Analysis: From Measured Data

 Influence of Oscillation Patterns on Wind activity

 North Atlantic Oscillation (Walker & Bliss, 1935)

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Teleconnection Analysis: From Measured Data

 Influence of Oscillation Patterns on Wind activity

 Central African-Caspian Oscillation (Kutiel & Helfman, 2004)

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Teleconnection Analysis: RegCM4

 Correlation: 0.87

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  • 2
  • 1

1 2 3 Index Value

North Atlantic Oscillation Index (Walker & Bliss, 1935)

RegCM4 NCEP

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  • 2
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1 2 3 4 Index Value

Central African-Caspian Oscillation (Kutiel & Helfmann, 2004)

RegCM4 NCEP

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1 2 3 Index Value

North Atlantic Oscillation Index (Walker & Bliss, 1935)

RegCM4 NCEP

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Teleconnection Analysis: RegCM4

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  • 3
  • 2
  • 1

1 2 3 Index Value

North Atlantic Oscillation Index (Walker & Bliss, 1935)

RegCM4 NCEP

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  • 3
  • 2
  • 1

1 2 3 4 Index Value

Central African-Caspian Oscillation (Kutiel & Helfmann, 2004)

RegCM4 NCEP

 Correlation: 0.39

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  • 2
  • 1

1 2 3 4 Index Value

Central African-Caspian Oscillation (Kutiel & Helfmann, 2004)

RegCM4 NCEP

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Teleconnection Analysis: Aerosol Transport

 Considering dust (smaller than 0.1 μm)  Understanding the regions of highest occurrence

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Conclusions

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E: jcia0004@um.edu.mt

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