de.mpg.escidoc.pubman.appbase.FacesBean
English
 
Help Guide Disclaimer Contact us Login
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Monitoring and quantifying future climate projections of dryness and wetness extremes: SPI bias

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons37338

Sienz,  F.
Decadal Climate Predictions - MiKlip, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons49546

Bothe,  O.
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons37148

Fraedrich,  K.
Max Planck Fellows, MPI for Meteorology, Max Planck Society;

Locator
There are no locators available
Fulltext (public)

hess-16-2143-2012.pdf
(Publisher version), 4MB

hess-16-2143-2012-supplement.pdf
(Any fulltext), 296KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Sienz, F., Bothe, O., & Fraedrich, K. (2012). Monitoring and quantifying future climate projections of dryness and wetness extremes: SPI bias. Hydrology and Earth System Sciences, 16, 2143-2157. doi:10.5194/hess-16-2143-2012.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-E656-F
Abstract
The adequacy of the gamma distribution (GD) for monthly precipitation totals is reconsidered. The motivation for this study is the observation that the GD fails to represent precipitation in considerable areas of global observed and simulated data. This misrepresentation may lead to erroneous estimates of the Standardised Precipitation Index (SPI), evaluations of models, and assessments of climate change. In this study, the GD is compared to the Weibull (WD), Burr Type III (BD), exponentiated Weibull (EWD) and generalised gamma (GGD) distribution. These distributions extend the GD in terms of possible shapes (skewness and kurtosis) and the behaviour for large arguments. The comparison is based on the Akaike information criterion, which maximises information entropy and reveals a trade-off between deviation and the numbers of parameters used. We use monthly sums of observed and simulated precipitation for 12 calendar months of the year. Assessing observed and simulated data, (i) the Weibull type distributions give distinctly improved fits compared to the GD and (ii) the SPI resulting from the GD overestimates (underestimates) extreme dryness (wetness). © 2012 Author(s). CC Attribution 3.0 License.