Abstract
Abstract This paper reports an analysis of the uninterrupted 1 s resolution data on a constant mid-tropospheric level collected by the NCAR Electra on 16 June 1979 over the Arabian Sea. The Electra completely encircled a well-developed cyclone during this MONEX1 flight mission. It is found that the subsynoptic-scale vertical velocity field consists of a distinct mesoscale as well as a convective scale component. Their prevalent wavelengths are about 30 km and 6 km, respectively. The updrafts are typically 1–3 m s−1 and the downdrafts ∼-1.0 m s−1. The meridional velocity spectrum is similar to that of the vertical velocity in the convective scale range. There is a significant upward flux of momentum associated with these motions. The moisture and liquid water fluxes axe also statistically significant. The fluctuations of the horizontal velocity components in the mesoscale range may be modeled by those of a Markov process with an autoregressive coefficient of 0.99. This is equivalent to having the spectra c...
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