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Dominant transport pathways in an atmospheric blocking event.

Enrico Ser-Giacomi1, Ruggero Vasile2, Irene Recuerda1

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This study introduces a Lagrangian flow network to map atmospheric blocking. The network reveals the Omega-block structure and transport pathways, even when individual paths are less probable.

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Area of Science:

  • Atmospheric science
  • Fluid dynamics
  • Meteorology

Background:

  • Atmospheric blocking events significantly impact regional weather patterns.
  • Understanding the dynamics of blocking, such as the Omega-block, is crucial for accurate weather forecasting.
  • Previous methods may not fully capture the complex transport associated with these events.

Purpose of the Study:

  • To construct a Lagrangian flow network for analyzing atmospheric blocking.
  • To identify the structure and transport pathways of an Omega-block event over Eastern Europe and Western Russia in summer 2010.
  • To develop a method for describing transport pathways using a hierarchy of probable paths.

Main Methods:

  • Utilizing a Lagrangian flow network approach.
  • Computing most probable paths of fluid particles to reveal the Omega-block skeleton.
  • Introducing a hierarchy of sets of highly probable paths to represent complex transport.

Main Results:

  • The constructed network successfully revealed the Omega-block skeleton of the 2010 summer event.
  • A hierarchy of probable paths provided a robust description of transport pathways.
  • These path sets maintained the geometry of transport even when individual path probabilities were low.

Conclusions:

  • Lagrangian flow networks are effective tools for analyzing atmospheric blocking.
  • The hierarchy of probable paths method enhances the description of transport dynamics during blocking events.
  • This approach accurately identifies the geometric structure of atmospheric transport pathways.