Vertical helicity (termed as Hp) consists of vertical velocity and vertical vorticity, reflecting vertical advection of vorticity. Until now, vertical velocity can't be obtained directly by observations, which leads to calculate vertical helicity inconveniently. It is well known that Q vector is taken as an advanced tool for diagnosing vertical motion, and when vertical velocity in atmosphere has wave-like feature, there is proportional relationship of divergence of Q vector and vertical velocity, i.e., ▽·Q∝ω(ω is vertical velocity in p-coordinate), in other words, the divergence of Q vector can estimate vertical motion indirectly. The Q vector is drawn into study on helicity first time in this paper, specifically, a new type of vertical helicity (termed as HQ) is constructed on the basis of Q vector divergence and vertical vorticity. HQ is an extensional form of Hp, and they have the same physical meaning and similar diagnostic feature. The intrinsic difference between HQ and Hp is that the vertical velocity needed not to be given before calculating HQ. On some degree, the genesis of HQ firstly realizes organic fusion of the two advanced tools of helicity and Q vector, meanwhile, the diagnostic ability of HQ will be improved along with the developing of Q vector theory. The application of HQ to a typical Changjiang-Huaihe Meiyu front cyclone torrential rainfall shows that HQ has a good reflecting ability to synchronous precipitation intensity, occurring region and their inhomogeneities, and discloses the characteristics of vertical vorticity advection tilting northwards with height over torrential rainfall area. Further analysis indicates that there is obvious positive vertical vorticity and convergence of Q vector divergence preserving over precipitation area, and there is a good corresponding relationship between convergence region of Q vector divergence and occurring region of precipitation. HQ is the synthetic manifestation of roles from Q vector divergence and vertical vorticity, however, the three dimensions spatial distributional feature of HQ has more similar to counterpart of Q vector divergence with respect to vertical vorticity, which displays HQ relating more closely to Q vector divergence.
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