Classifier Instance:

Anchor text: Northern Hemisphere
Target Entity: Northern_Hemisphere
Preceding Context: Given that the lapse rate is not a conservative quantity when the tropopause is considered for stratosphere-troposphere exchanges studies, there exists an alternative definition named dynamic tropopause. It is formed with the aid of potential vorticity, which is defined as the product of the isentropic density, i.e. the density that arises from using potential temperature as the vertical coordinate, and the absolute vorticity, given that this quantity attains quite different values for the troposphere and the stratosphere. Instead of using the vertical temperature gradient as the defining variable, the dynamic tropopause surface is expressed in potential vorticity units (PVU), with the tropopause layer typically lying within the 1.5–2 PVU surface in the
Succeeding Context: , although no universal values exist. Given that the absolute vorticity is positive (negative) in the Northern (Southern) hemisphere, the threshold value should be taken as positive (negative) north (south) of the equator. Theoretically, to define a global tropopause in this way, the two surfaces arising from the positive and negative thresholds need to be matched near the equator using another type of surface such as a constant potential temperature surface. Nevertheless, the dynamic tropopause is useless at equatorial latitudes because the isentropes are almost vertical.
Paragraph Title: null
Source Page: Tropopause

Ground Truth Types:

Predicted Types:

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