Geoscience Reference
In-Depth Information
TABLE 9.2
Spearmann Rank Correlation ( ρ ) Values between Monthly Precipitation
Values and Atmospheric Circulation Modes
Site
NAO*
PDO*
PNA*
SOI*
AND
-0.09
-0.15
-0.02
-0.1
ARC
-0.01
-0.03
0.04
-0.16
BNZ
0.05
-0.11
-0.18
0.06
CDR
0.01
0.03
-0.14
0.03
CWT
-0.01
-0.13
-0.05
0.06
HBR
-0.01
-0.02
-0.35
0.16
HFR
0.09
0.09
0.04
0.01
JRN
0.03
0.06
0.04
0.02
KBS
0.03
-0.08
-0.07
0.1
KNZ
0.08
0.03
0.06
0.01
LUQ
0.17
0.09
0.04
0.05
NTL
0.05
-0.01
0.06
-0.01
NWT
0.02
0.1
0.06
-0.01
SEV
0.14
0.15
0.01
-0.03
SGS
0.09
0.07
-0.11
-0.04
VCR
0.04
0.03
0.05
-0.03
Notes: . Signiicant.values.(P.<.0.05).are.shown.in.bold..Index.abbreviations.are.as.follows:.NAO,.North.
Atlantic.Oscillation;.PDO,.Paciic.Decadal.Oscillation;.PNA,.Paciic.North.American.Index;.SOI,.
Southern.Oscillation.Index..See.Table 10.1.for.site.abbreviations.
North.America;.however,.the.spatial.patterning.of.these.values.is.complex..Positive.
ρ-values.dominated.in.Alaska,.the.Canadian.interior,.the.US.Great.Plains,.and.the.
Intermountain. Basin.. Negative. ρ-values. were. found. along. the. northwest. Paciic.
Coast,.the.southern.Rocky.Mountains.and.interior.arid.areas.(southwestern.United.
States,.northern.Mexico,.southern.Mexico),.and.the.Atlantic.and.Gulf.coasts..Smaller.
areas.of.negative.correlations.were.found.in.the.Canadian.Arctic.
Patterns.of.correlation.for.the.NAO.appear.to.be.somewhat.more.spatially.coher-
ent.than.those.associated.with.the.SOI..Signiicant.positive.values.occur.throughout.
most. of. North. America,. with. the. exception. of. the. Paciic. Coast. and. interior. arid-
desert.region..Precipitation.over.most.of.Mexico,.with.the.exception.of.the.arid.and.
desert. north,. is. negatively. associated. with. the. NAO.. Precipitation. in. the. extreme.
north.and.interior.arid-desert.regions.are.not.signiicantly.correlated.with.the.NAO,.
nor.is.precipitation.throughout.most.of.the.Caribbean.islands.
The. remaining. two. circulation. indices. (PDO,. PNA). are,. for. the. most. part,. not.
signiicantly. correlated. with.precipitation. throughout. most. of. the. North. American.
continent..The.PDO.shows.scattered.areas.of.positive.and.negative.association,.most.
notably. along. the. Paciic. coast. of. California. (a. region. of. positive. association). and.
extending.upward.into.the.Paciic.Northwest.(where.the.association.is.signiicantly.
negative)..Florida.and.the.Caribbean.islands.are.also.positively.correlated.with.PDO..
 
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