Presentation is loading. Please wait.

Presentation is loading. Please wait.

THE STRUCTURE OF DROUGHT Ronald Stewart University of Manitoba.

Similar presentations


Presentation on theme: "THE STRUCTURE OF DROUGHT Ronald Stewart University of Manitoba."— Presentation transcript:

1 THE STRUCTURE OF DROUGHT Ronald Stewart University of Manitoba

2

3 A lot of nothing?

4 To illustrate some aspects of drought's 'structure' (internal features) OBJECTIVE

5 The Canadian Prairies

6 Mackenzie Saskatchewan PRESSURE (hPa) FLUX (1011 kg/Pa/month) VERTICAL MOISTURE FLUX PROFILE Into the Prairies Out of the Prairies

7 PDSI- Palmer Drought Severity Index SPI- Standardized Precipitation Index ---

8 COMMON VIEW …

9 Drought … Not Too Hot TemperaturePrecipitation Summers of 2000, 2001 and 2002

10 PRECIPITATION-TEMPERATURE ANOMALY Agricultural Years (Sept-Aug) Edmonton

11 Monthly temperature anomalies: agricultural region of the Prairies

12 CLOUD AMOUNT

13 2001 ___________ 900 km ____________

14 WATER AND ENERGY CYCLING Many factors affect the cycling of water and energy during drought

15 CANADIAN PRAIRIES 2002

16 Climatology Low precipitation events: 52% of total Sub-drought 2002 Low precipitation events: 60% of total Daily Precipitation Amounts Low precipitation event: < 10 mm

17 VIRGA Summer Edmonton Precipitation Amount Reduction (%) -49 Precipitation (h) 123 Virga (h) 130

18 Cold Lake 24 April 2003 Hail and rain 243% of monthly average accumulation Cold Lake 1-3 October 2005 Rain and snow 143% of monthly average accumulation PRECIPITATION RATE 45 dBZ maximum 20 dBZ maximum

19 OCCURRENCE OF CALM CONDITIONS

20 DUSTSTORMS 32 major dust storms in Saskatchewan in 2002

21 CANADIAN PRAIRIES 2002 _________ 900 km ___________

22 June 6-9, 2002

23 Palmer Drought Severity Index (PDSI) for agricultural years with severe drought ___ 900 km __

24 DROUGHT TYPES The sustained lack of precipitation can be linked with different 'types' A drought can go between 'types'

25 Drought has spatial and temporal 'structure' One can think of it as being of various 'types' Understanding drought needs to consider such features SUMMARY


Download ppt "THE STRUCTURE OF DROUGHT Ronald Stewart University of Manitoba."

Similar presentations


Ads by Google