Presentation is loading. Please wait.

Presentation is loading. Please wait.

Zentralanstalt für Meteorologie und Geodynamik A re-evaluation of the role of subsidence in valley and basin warming Thomas Haiden.

Similar presentations


Presentation on theme: "Zentralanstalt für Meteorologie und Geodynamik A re-evaluation of the role of subsidence in valley and basin warming Thomas Haiden."— Presentation transcript:

1 Zentralanstalt für Meteorologie und Geodynamik A re-evaluation of the role of subsidence in valley and basin warming Thomas Haiden

2 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Two concepts in mountain CBL theory Compensating subsidence Equilibrium slope flow (Prandtl-type) Additional insights into valley and basin warming

3 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Subsidence Upper Inn valley slope flow subsidence

4 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Mass budget Uw b D

5 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Heat budget U H Slope Valley w

6 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Heat budget U H Slope Prandtl type equilibrium flow w

7 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Heat budget U H constraint on upslope mass-flux w

8 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Heat budget H equivalent to direct horizontal heat input

9 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Heat budget Temperature evolution in valley atmosphere can be modelled without explicitly simulating slope wind layer

10 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Meteor Crater Test of horizontal heat input concept under near-ideal conditions

11 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Meteor Crater The model (1.5-D) Simple horizontal heat input model, with dry-adiabatic adjustment Realistic area-height distribution of the crater Sensible heat flux parameterized based on detailed radiation distribution

12 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Meteor Crater Subsidence signal

13 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Heating modes Same warming at all heights Strongest warming in stable layer Upslope mass-flux in EQ Upslope mass-flux Non-EQ

14 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Heating modes

15 Zentralanstalt für Meteorologie und Geodynamik th AMS MESO Conf Conclusions Horizontal heat input is good approximation Can be applied to realistic topography If not fulfilled, deviation from Prandtl-type equilibrium flow Slope flow non-local Slope flow uses up surplus temperature to remain continuous Stable layer more of an obstacle over steeper slope


Download ppt "Zentralanstalt für Meteorologie und Geodynamik A re-evaluation of the role of subsidence in valley and basin warming Thomas Haiden."

Similar presentations


Ads by Google