Motivational Questions What is the role of warm air advection during sustaining events?


НазваMotivational Questions What is the role of warm air advection during sustaining events?
Дата конвертації15.03.2013
Розмір445 b.
ТипПрезентации







Data & Methods: Composites









Motivational Questions

  • What is the role of warm air advection during sustaining events?

  • What is the role of the stable layer and convective inhibition?

  • How is the enhanced vertical wind shear important to the maintenance of a QLCS?

  • What role does low-level diabatic cooling play in the evolution of QLCSs?





















Low-level Balance Theory for Long Lived Squall Lines

Low-level Balance Theory for Long Lived Squall Lines



Low-level Balance Theory for Long Lived Squall Lines

Low-level Balance Theory for Long Lived Squall Lines



Low-level Balance Theory for Long Lived Squall Lines

Low-level Balance Theory for Long Lived Squall Lines







Response of QLCS to Low Level (Nocturnal) Cooling





Sensitivity Experiments







In the mean, QLCSs that decay upon encountering the northeastern U.S. coastline are collocated with frontal boundaries and regions of 900:800 hPa frontogenesis, with little temperature advection over the QLCS.

  • In the mean, QLCSs that decay upon encountering the northeastern U.S. coastline are collocated with frontal boundaries and regions of 900:800 hPa frontogenesis, with little temperature advection over the QLCS.

  • Events that survive over the ocean waters are associated with warm air advection (destabilize atmosphere and strengthen low level temperature inversion: 31 May 2002 case) with little 900:800 hPa frontogenesis associated with the QLCS.

  • 31 May 2002 event

    • Stronger vertical wind shear helps to balance the cold pool, extending the longevity of the QLCS.
    • Forcing transitions from a surface-based cold pool to more of a bore type feature (perhaps due to a stronger stable layer compared to 23 July?).
  • 23 July 2002 event

    • Reducing the diabatic cooling to 15% of the CTRL simulation extended the longevity of the QLCS.
    • Shows that diabatic processes can be as important as the marine layer in influencing the evolution of QLCS (though this may not always be the case).


extra slides











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