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Dybde for null årstidsamplitude (ZAA)

Dybden av null årstidsamplitude (ZAA) er avstanden mellom overflaten av bakken og punktet under overflaten der bakken ikke påvirkes av temperaturforskjellene gjennom et år. Her er den årlige variasjonen i temperaturen mindre enn 0,1°C. Dybden på ZAA kan variere mellom 10 og 20 meter under overflaten, og avhenger av klimaforhold og jord. Enda lenger ned enn ZAA øker jordens temperatur gradvis igjen, på grunn av den geotermisk varme.

Depth of Zero Annual Amplitude (ZAA), © PermaNet Alpine Space

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