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Warm and Cold core systems


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Posted
  • Location: Yorkshire Puddin' aka Kirkham, Lancashire, England, United Kingdom
  • Weather Preferences: cold winters, cold springs, cold summers and cold autumns
  • Location: Yorkshire Puddin' aka Kirkham, Lancashire, England, United Kingdom

A couple of questions about warm and cold core systems:-

-In a warm core high is there subsidence from the lower stratosphere right down to the ground?

-In a warm core low is there uplift in the lower troposphere but subsidence in the upper troposphere and the lower stratosphere?

-In a cold core low is there uplift from the ground right up into the lower stratosphere?

-In a cold core high is there subsidence in the lower troposphere but uplift in the upper troposphere and the lower stratosphere?

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Posted
  • Location: Coventry,Warwickshire
  • Location: Coventry,Warwickshire

When considering this you need to think about what warm and cold core mean.

Firstly lets look at high pressure systems and the difference between a cold and warm core high. A warm core high is deep and involves subsidence from the top of the troposphere and these tend to evolve nearer the tropics. A cold core high builds from the surface and although moderately deep involve surface subsidence.So a cold core high tends to be shallow and involve artic air.

Looking at low pressure systems then cold core lows tend to develop at mid latitudes are deep and tend to have a cold pool of air aloft.These have rising air at all levels in the atmosphere. Warm core lows tend to be shallower and involve lifting only to a limited level (typically mid levels).

Your statements then are largely correct except when you start looking at the details of warm core tropical cyclones where you may get subsidence at the center.We won't even mention the differences between barotropic and baroclinic. Below is a link which I hope explains it a little better than I can.

Habyhints high and low pressure types

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Posted
  • Location: Yorkshire Puddin' aka Kirkham, Lancashire, England, United Kingdom
  • Weather Preferences: cold winters, cold springs, cold summers and cold autumns
  • Location: Yorkshire Puddin' aka Kirkham, Lancashire, England, United Kingdom
nothing wrong with your explanation Brick, and the link is good.

Yeah thank you Brick the pages on the warm and core systems was a very interesting read. :lol:

I just have something extra to add about an anonomly in Siberia.

The upper low that exists above the cold cored Siberian High Pressure System in Siberia in winter causes high level rising motions due to positive vorticity in the upper troposphere that allow high level Cirrus and Cirrostratus clouds to form via adiabatic cooling. These clouds produce very cold but light diamond dust snowfall.

Anomalously in the Siberian winter these clouds also slightly offset radiational cooling over Siberia as well by absorbing long wave radiation from the surface and re-radiating it back to the surface.

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