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Observations of lifted temperature minimum (LTM) profiles in the nocturnalboundary layer were first reported in 1932. It was defined by the existenceof a temperature minimum some centimetres above the ground. During thefollowing decades, several research studies analysed this phenomenonverifying its existence and postulating different hypotheses about itsorigin.  The aim of this work is to study the existence and characteristics of LTMduring the evening transition by using observations obtained during theBoundary Layer Late Afternoon and Sunset Turbulence (BLLAST) campaign. Dataobtained from two masts instrumented with thermocouples and wind sensors atdifferent heights close to the ground  and a mast with radiometers are usedto study the role of mechanical turbulence and radiation in LTM development.  The study shows that LTM   can be detected under calm conditionsduring the day–night transition, several hours earlier than reported inprevious work. These conditions are fulfilled under weak synoptic forcingwhen the local flow shifts associated with a mountain–plain circulation inrelatively complex orography. Under these special conditions, turbulencebecomes a crucial parameter in determining the ideal conditions for observingLTM. Additionally, LTM observed profiles are also related toa change in the atmospheric radiative characteristics under calm conditions

Lifted temperature minimum during the atmospheric evening transition