Objective Identification Method of Cold-Front Precipitation in Winter Half Years over East Asia

Figure 2

(a) Surface precipitation and objectively identified cold front, (b) cold-frontal zone II, and (c) precipitation falling into cold frontal zone II at 00:00 UTC on September 18, 2017. (d, f, h) The extended cold-frontal zones according to schemes 1–3, respectively. (e, g, i) Precipitation falling into the three extended cold-frontal zones. The blue grids are cold-frontal zone II, the red grids are the extended parts, shading denotes the precipitation (unit: mm), the contour is the sea-level pressure at an interval of 4 hPa, and the blue line indicates the objectively identified cold front.

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