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Within ecCharts users can view CONTROL-10/HRES PV at the 315K potential temperature level (example at Fig8.1.13.1). Values above 2.0 PV units (i.e. the stratosphere) are shaded while lower values (i.e. the troposphere) are unshaded. Generally on these charts polar airmasses correspond to PV > 2 whilst more tropical / subtropical airmasses correspond to PV < 2. So by examining this PV field one can infer, approximately, where the upper level boundary between airmasses of polar and more tropical origins actually lies.
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Fig8.1.13.1: ecCharts example showing CONTROL-10/HRES PV and mean sea level pressure.
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