Botswana Mozambique South Africa Zimbabwe About Tutorial Glossary Documents Images Maps Google Earth go
Please provide feedback! Click for details
Home The River Basin People and the River Governance Resource Management
The Limpopo River Basin
 Introduction
Geography
Climate and Weather
 Principles of Climate and Weather
 Hydrologic Cycle
Climate Variability
 Climate Classification
 Water Scarcity
 Drought
 Climate of the Limpopo Basin
 Climate Change
Hydrology
Water Quality
Ecology and Biodiversity
Sub-basin Summaries
 References

 



Feedback

send a comment

Feedback

 

Climate Variability  

Climate variability refers to the deviation of climate statistics over a given period of time (for example a specific month, season or year) from the long-term climate statistics relating to that corresponding calendar period. It thus describes how the climate over a comparatively short period varies from long term climatic averages with direct consequences for water resource management. For example one direct result may be a change in availability of surface and groundwater resources. Individual events such as the El Niño or El Niña Southern Oscillation phenomena or volcanic activity can cause significant climate variation.

A critical variable for assessing trends in precipitation and evapotranspiration is the Coefficient of Variation (CV), which can be applied to monthly meteorological data.

The CV is a statistical measure of the potential seasonal and interannual fluctuations in water availability for regions. Increased climate variability indicates larger year-to-year fluctuations, a higher CV and hence, less predictability in the climate.

CV is seen as a more accurate assessment for water availability than annual average precipitation/evapotranspiration, as it shows the natural year-to-year variability. Higher CV indicates a greater degree of precipitation on a year-to-year basis in a specific area (Schulze 2006).The variability of precipitation and evapotranspiration, both in time and in space across a region, directly influences the availability and variability of surface and groundwater resources.

For a range of CV% values found in the Limpopo River basin see Climate Variability in the basin.

Precipitation and evapotranspiration are important determinants of surface water and groundwater distribution and quantity.
Source: DWA 2008
( click to enlarge )

 



Interactive

Explore the sub-basins of the Limpopo River


Explore the interactions of living organisms in aquatic environments


Examine how the hydrologic cycle moves water through and around the earth


Tour video scenes along the Limpopo related to The River Basin Theme