Summer Drought Patterns in the Middle-Lower Reaches of the Yangtze River Basin and Their Connections with Atmospheric Circulation before and after 1980

Figure 4

The distribution of the SPI3 for the typical drought years of the three drought patterns in the summers of (a) 1966, (b) 1967, (c) 1972, (d) 1978, (e) 1963, (f) 1965, (g) 1991, (h) 2003, (i) 1973, (j) 1976, (k) 1994, and (l) 2002. The positive values (blue) denote wet conditions, and the negative values (red) denote dry conditions.

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(l)