Abstract
AbstractWe present the first observational evidence for convectively generated cold pools (CP) as driving mechanism for low‐level jets (LLJ). Our findings are based on a unique campaign data set that allowed us to perform a systematic assessment of the process. During the three‐month campaign in Germany, 6.8% of all identified LLJ profiles were connected to a CP (CPLLJ). Most measured CPLLJs appeared with the CP front and lasted for up to two hours. Moreover, we have observed a CP favoring the formation of a several‐hours long LLJ. In that case, a strong LLJ and cooling of the atmosphere between the surface and at least 400 m a.g.l. were seen when the density current reached the measurement site. The development led to the formation of a near‐surface temperature inversion during daytime as a prerequisite for the LLJ, not unlike the mechanism of nocturnal LLJs.
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