Climate map explorer - Drought frequency
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For the projected precipitation for the selected timeframe (2001-2030, 2011-2040, 2031-2060, 2041-2070 or 2071-2098, respectively) the number of drought events has been counted. The same has been accomplished for the years 1961-1991(the baseline period). The map depicts the difference between the number of drought events in the selected timeframe and the number of drought events in the baseline period. Positive values indicate an increase in the number of droughts (red colors) while negative values indicate fewer droughts (blue colors).
Drought frequency maps are available for the following GCMS: MPI ECHAM5, UKMO HadCM3, GFDL CM2.1, MIUB ECHO-G and NCAR CCSM3.0 and the following SRES scenarios: A1B, B1 and A2
3 months scale
In these maps at each point in time the accumulated precipitation sum of the past 3 months is considered while valuating it as low or high. Be aware that this map alone has limited informative value since two short droughts may exhibit a lower impact than one prolonged drought, but are counted as two while one prolonged drought is counted as one.
12 months scale
In these maps at each point in time the accumulated precipitation sum of the past 12 months is considered while valuating it as low or high. Be aware that this map alone has limited informative value since two short droughts may exhibit a lower impact than one prolonged drought, but are counted as two while one prolonged drought is counted as one.
Please see also the precipitation and temperature difference maps, which grant more basic access to climate information:
Use the ci:grasp map explorer to browse this pool of interactive climate maps.
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Note
Please avoid over-interpreting the maps. Maps only have a certain explanatory power. For example, the data presented on the interactive world map is not applicable for highly localized projections, forecasts, and "ground truthing" events and processes there.
Please make use of the ci:grasp glossary to clarify terms you are unfamiliar with.
It is helpful to discover whether and where adaption measures are currently taking place, and what type of impacts they address. You can search for adaptation projects in our adaptation project database.
Please refer to the ci:grasp list of references for an ample body of scientific literature. The references in the text throughout the platform are collected there.
General information
Droughts are periods of time where precipitation falls beneath a threshold until it rises again above an average level.For the projected precipitation for the selected timeframe (2001-2030, 2011-2040, 2031-2060, 2041-2070 or 2071-2098, respectively) the number of drought events has been counted. The same has been accomplished for the years 1961-1991(the baseline period). The map depicts the difference between the number of drought events in the selected timeframe and the number of drought events in the baseline period. Positive values indicate an increase in the number of droughts (red colors) while negative values indicate fewer droughts (blue colors).
Drought frequency maps are available for the following GCMS: MPI ECHAM5, UKMO HadCM3, GFDL CM2.1, MIUB ECHO-G and NCAR CCSM3.0 and the following SRES scenarios: A1B, B1 and A2
3 months scale
In these maps at each point in time the accumulated precipitation sum of the past 3 months is considered while valuating it as low or high. Be aware that this map alone has limited informative value since two short droughts may exhibit a lower impact than one prolonged drought, but are counted as two while one prolonged drought is counted as one.
12 months scale
In these maps at each point in time the accumulated precipitation sum of the past 12 months is considered while valuating it as low or high. Be aware that this map alone has limited informative value since two short droughts may exhibit a lower impact than one prolonged drought, but are counted as two while one prolonged drought is counted as one.
Please see also the precipitation and temperature difference maps, which grant more basic access to climate information:
the map explorer for RCP scenario projections.
the map explorer for AR4 SRES scenario projections.
Firstly, the standardized precipitation index (SPI) was computed on a 3 month scale. Then, drought events were counted. This was accomplished for the 2001-2030 period and the 1961-1990 period and the difference of both is mapped. (Please refer to the glossary for terms such as SPI and drought.)
12 months scale
Firstly, the standardized precipitation index (SPI) was computed on a 12 month scale. Then, drought events were counted. This was accomplished for the 2001-2030 period and the 1961-1990 period and the difference of both is mapped. (Please refer to the glossary for terms such as SPI and drought.)
the map explorer for AR4 SRES scenario projections.
Methodology
3 months scaleFirstly, the standardized precipitation index (SPI) was computed on a 3 month scale. Then, drought events were counted. This was accomplished for the 2001-2030 period and the 1961-1990 period and the difference of both is mapped. (Please refer to the glossary for terms such as SPI and drought.)
12 months scale
Firstly, the standardized precipitation index (SPI) was computed on a 12 month scale. Then, drought events were counted. This was accomplished for the 2001-2030 period and the 1961-1990 period and the difference of both is mapped. (Please refer to the glossary for terms such as SPI and drought.)
Data Sources
| Dimension | Dataset name | Unit | Scenarios | Resolution | Source |
| precipitation | IPCC GCM output (MPI ECHAM5, UKMO HadCM3, GFDL CM2.1, MIUB ECHO-G, NCAR CCSM3) | mm | A1B, B1 and A2 | GCM resolution | IPCC (http://www.ipcc.ch/); WCRP CMIP3 Multi-Model Database (http://www-pcmdi.llnl.gov/) |