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Unformatted text preview: mp;*($ 81(%11($ ,*&(7*--%$ #4*#$ ?,+0*&-+.$ 71,$ 81,+$ #4*($ * 8*,T+.$.+)*.*-/%)*-+$0*,&*!&-&#B$!+71,+$#[email protected]<K%2 )+(#",B$ ?,&1,$ #1$ *!1"#$ @RZX$ 4*%$ C+*T+(+.$ %"!%#*(#&*--B$ %&()+ O4+,+$&%$1#4+,$+0&.+()+$#4*#$)4*('+%$&($#4+$6%&*($81(%11($ #4+($ 9a"8*,$ +#$ *-2>$ @RRRW$ a,&%4(*8",#4B$ *(.$ Q1%C*8& 1))",,+.$*!1"#$#4+$#&8+$17$#[email protected][@RZZ$)-&8*#+$%4&7#$9\*('>$ JKKKW$ 5*,T*,$ +#$ *-2>$ JKK<=>$ &(01-0&('$ -*,'+/%)*-+$ )4*('+%$ &( Figure 18.x Global map of the Palmer Drought Index for 1900 to 2002. The Palmer index is [email protected]=$*-1('$C&#4$)4*('+%$&($DE5F$9V"*('$+#$*-2>$JKK;W$]&*($. The PD*#81%?4+,&)$x)&,)"-*#&1(2$ 54&7#%$ &($ #4+$ \*-T+,$ N&,)"-*#&1($ *(. FAQ 3.2, Figure 1. The most important spatial pattern (top) of the monthly Palmer Drought Severity Index (PDSI) for 1900 to 2002 SI is a prominent inde of drought and measures the+#$ ulaivpdJKK;=>$e*(.$l mean conditiocumulatid ?,+)&?&#*#&1($ng previo+0&.+(#$n anmean sconditions.oThe bottom*??+*,$ #1$ !+$ )1"(#+,&('$ +77+)#% cum *-2>$ rominentloindex of ns)&($urface lan ve isdeficitrprelative sto clocal d e+(4*()+.$ r-*(./%+*$ )1(#,*%#%$ panel at e eficit (relativ to ca .+)-&(+%$ in s -*(.$ mo ture by inco orati *,+$ u pre ipitatio stimate of moistu e drawn int the atmosphere (based on atmospheric temperatures) into a hydrological accounting system. The lower panel shows how the sign and strength of this pattern has changed since 17$ e lower p t are positiv (nega1900. Red and ora&($ arsas are drier (howththeersign b%18+$e+M#+(#>$ wetterthis than average when th9%++$ shown in thsincelo1900. eThe smooth curve nge %1"#4+,($6%&*$n*(.>$ #1$ andd strength &($ 51"#4+*%#$6%&*$ e values e hows wetter) a av age and lue an gr en areas are of (drier) pattern has changed &(),+*%+.$ D-$ E&am...
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