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GAP TOPOGRAPHY

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GAP TOPOGRAPHY. SEEPAGE/SURGE TYPES. FT. HUACHUCA, AZ PROFILER 08-July-2002. Douglas AZ dewpoint temperature 07-08 July 2002. II. An analysis of mean wind roses during warm- dry months and cool-wet months in SE Arizona. WIND ROSE FOR DOUGLAS, AZ July-August (1973-2002). GMT.

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slide6

II. An analysis of mean wind roses during warm-

dry months and cool-wet months in SE Arizona.

slide7

WIND ROSE FOR DOUGLAS, AZ

July-August (1973-2002)

GMT

slide9

DOUGLAS, AZ: CONTRASTING SURFACE WINDS (Jul-Aug)

WARM/DRY COOL/WET

25.3ºC / 113mm

27.3ºC / 47mm

slide10

July SLP anomalies

(Cool/Wet - Warm/Dry)

slide11

July 700mb Hgt. anomalies

(Cool/Wet - Warm/Dry)

slide12

III. Origin of surface moisture entering SE Arizona:

A. West (Yuma Gulf Intrusions); South (Sonoran

Valley Intrusions); Southeast (Rio Grande

Intrusions)

B. Surge frequency by month and surge type.

C. Mean daily rainfall during the lifecycle of a

surge event.

slide18

High dew point days at Douglas can arise from any one

or combination of the following:

1. Air mass moistening from a local rainfall event.

2. Mesoscale outflow boundaries arriving at the site.

3. Intensification of surface moisture advection under a

strengthening SLP gradient.

4. Large scale synoptic forcing/moistening related to an

approaching easterly wave, tropical cyclone or back door

cold front.

Question: How are these events related to local

and synoptic scale forcing?

slide19

IV. Relationships between surge events and:

A. Hemispheric climate indices

B. Regional climate indices.

slide23

July Surge TYPE 3 (RIO GRANDE) vs.

Regional Climate Indices

slide26

Jul-Sept Surge TYPE 1 (YUMA) vs.

Regional Climate Indices

summer 2004 climate indices expected to influence the frequency of se arizona seepage surge events
Summer 2004 Climate Indices Expected to Influence the Frequencyof SE Arizona Seepage/Surge Events