Circulation patterns in terrestrial atmospheres

Circulation patterns in terrestrial atmospheres - large...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Circulation patterns in terrestrial atmospheres The value u is called the geostrophic wind , and is parallel to the isobars. The more the wind is away from the isobars the more there is a time-dependent situation - i.w du/dt is not 0. In the northern hemisphere the wind rotates anti-clockwise around a low. Mars too has a strong eastward-moving jet powered by baroclinic waves in the winter hemisphere close to the boundary of the seasonal CO 2 ice cap. Earth's middle atmosphere average latitudinal wind structure: This is dominated by Ozone heating. In the polar summer there is continuous input so there is a
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: large summer-winter difference and a high-level wind pattern is set up. Stratosphere and Lower Mesosphere There is believed to be a fairly simple global wind pattern in the 20-50km height range. Looking at the Coriolis equation above, in summer northern hemisphere u<0 and phi > 0 so we expect dp/dy>0. In the winter hemisphere we get u>0 and phi < 0 so dp/dy > 0. Set u>0 and phi < 0 so dp/dy > 0. So, the pressure increases from winter to summer poles - a contract with ground level where the surface governs the heating, and we get maximum pressure from the maximum heating....
View Full Document

Ask a homework question - tutors are online