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标准化蒸散亏缺指数用户说明书
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The EDDI User Guide
v1.0 – September 2017
Jeff Lukas, Mike Hobbins, Imtiaz Rangwala
and the EDDI team
Contents' - Use
$ Bookmarks$ in$ PDF$ to$navigate$
1) Cover
2) Contents
3) The'inte nded'audience
4) What'this'User'Guide' provides
5) EDDI'in'a'nutshel l
6) Key'features'of'EDDI
7) What'EDDI'is'not
8) Drought'=' moisture'imbalance
9) About'Evaporative' Demand'( E
0
)
10) Normal'E
0
varies' across'the' US
11) Large' seasonal'cycle ' in'E
0
12) The'relationship' betwee n' ET'and'E
0
13) High'E
0'
='surface'moisture'stress
14) Increasing'E
0'
refle cts' drought'i ntensification
15) How'EDDI'is'calculated
16) EDDI'categories
17) Seasonal'in terpretation' of 'EDDI
18) EDDI'compared'with'other'indicators
19) EDDI'compared'with'other'indicators
20) Comparing'different'indicators
21) Convergence' of'evidence'for'drought
22) Basi c s'of're a ding' an'E DD I'map
23) Interpreting'EDDI'at'dif f erent' timescales
24) Interpreting'EDDI'at'dif f erent' timescales
25) EDDI'gives'early' warning'of'flash'drought
26) More'flash'drought' early-warning
27) Not'all' EDDI
'hotspots' become'drought
28) EDDI'in' agricultural' drought'monitoring
29) Potential' applications'in' fire'&'hydrology
30) Decomposing' E
0'
to'see' drought' drivers
31) Where' to' get'current' EDDI' maps
32) Where' to' get'past' EDDI'maps
33) Where' to' get'EDDI'time-series
34) Technical' background'on'EDDI
35) Acknowledgements
2
Thi s'User'Guide'is'i ntended'for:
• Mana g ers: Those'who'monitor'drought'
conditions'in' order' to'manage' resources'and'
make'decisions;'e.g.,'ag'prod ucers,' and'water,'
fire,'forests,'range,'and'wildlife'managers
• Translators:- Those'who'work'c losely'with'the'
above' groups'in'an'advisory' or'outreach'role'
and/or' disseminate' drought' information;'e.g. ,'
NWS'forecasters,'State'climatologists,'drought'
coordinators
• Researchers: Those'who'study' the'drought'
phenomenon' to'better'understand' its'causes,'
manifestations,'and'impacts
• The$level$of$information$in$the$Guide $is$most$
suited$for$the$first$two$groups.$But'researchers'
may'find' the'overview'useful' b efore'delving' more'
in to'the'tech nical'backgr ound' on'EDDI.
3
What'this'User'Guide'provides
Clear'and' concise'explanations' of:
• Evapora tive'Demand'(E
0
)'and'why'it'is'important
to'drought
• Ho w'EDDI'is'calculated 'and'how'it'depicts
Evapora tive'Demand
• Ho w'EDDI'relates'to'other' drou g ht' in d icators
• Ho w'to'interp r et'EDDI'maps'over'differen t' time
windows
This$User$Guide$will$be$updated$ based$on$user$
feedback.$Please$let$us$know$if$it$was$helpful,$ and$
how$it$might$be$improved.$
Send 'feedback'to'Jeff 'Lukas,'lukas@co lorado.edu
4
EDDI'in 'a' nu tshell
• EDDI'is'a'drought'index'based'on'the'
“thirst ”'of' the' atmosphere—which'
lead s'to 'the'd rying' of'soils'and'
vegetation,'and'also'reflects'th at'dr ying
• More'technically:'EDDI'shows'the'
anomaly*' in'daily'!"#$%& #' ("!)*!+#,*)
aggregated' over' a'specified'time'
window,'a t'a 'given'location
• EDDI'is'calculated'from'observations'of'
the'atmosphere'near'the'l and'surface:'
temperature,'humidity,' windspeed,' and'
solar'radiation
• EDDI'ca n'provide'added'value'to'other'
drought' indicators,' especially'for'early'
wa rning'a nd'flash'drought'detection'
*i.e.,'t he'unusualness' of'the'c urrent 'conditions'
as'compared'to'the'rang e'of'hist orical' conditions'
5
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