The Budyko Framework (Budyko,1974) constitutes the strong globally observed empirical relationship between the ratio of atmospheric water supply and demand (potential evaporation/precipitation) and evaporative ratio (evaporation/precipitation ~=1-runoff/precipitation) for multi-annual data at the catchment scale. The framework has a long history as it finds its origins in empirical findings of Schreiber (1904) and Ol'dekop (1911) and over the years many Equations have been developped that describe the empirical relationship E/P =F(Ep/P) (e.g. Turc, 1954, Fuh 1981, Zhang et al, 2001, Wang & Tang, 2014).
Over the past years it seems the framework is experiencing a Renaissance where the framework is used to understand and to predict water balance behavior, both for stationary and changing climate and landscape conditions.
This Renaissance mainly started with the work of Milly (1993, 1994a,b) who was the first to attempt to understand the role of several climate and landscape conditions that control long-term water balance. Milly's work lead to many studies applying the framework to understand the role of different climate and landscape properties on the water balance.
Although the framework was originally developed for multi annual mean values, Dooge (1992) introduced how the framework can be used to asses the impact of climate change and variability on the water balance, which has subsequently been extended to also quantify the impact of humans (eg. via water use and land over change (Roderick & Farquhar, 2011; Wang & Hejazi, 2011). The past couple of years this approach is now very frequently applied.
The strong empirical relationship between Ep,P and runoff ratio also brings up the interesting question how landscape properties evolve under climate conditions such that this strong empirical relationship is found. Some initial studies have been performed (e.g., Gentine et al., 2012; Troch et al., 2013) but it seems that such approaches are still in their infancy.
The question I now have is: what do you consider the future of the Budyko framework?
Will you consider this framework a valuable tool to guide hydrologic studies in the future? What questions regarding the framework are still unaddressed, but would provide valuable insight? How can we use new data sources to improve our understanding? What novel approaches (eg for more multidisciplinary research efforts) do you envision? How can we test some of the underlying assumptions of the framework when it's applied to changing climate and landscape conditions?
There is a recent paper addressing the relationship between the water yield and climate and watershed properties in the framework through the theoretical perspective. The paper name is ''Global pattern for the effect of climate and land cover on water yield"
http://www.nature.com/ncomms/2015/150109/ncomms6918/full/ncomms6918.html or https://www.researchgate.net/publication/270656535_Global_pattern_for_the_effect_of_climate_and_land_cover_on_water_yield
Article Global pattern for the effect of climate and land cover on water yield
We used a Budyko framework to separate the effects of land use and climate changes on water avaialbility / evaporation:
https://www.researchgate.net/publication/259962284_Separating_the_effects_of_changes_in_land_cover_and_climate_a_hydro-meteorological_analysis_of_the_past_60_yr_in_Saxony_Germany?ev=prf_pub
Article Separating the effects of changes in land cover and climate:...
The framework has also been used when assessing the drying and wetting trends over land:
http://www.nature.com/ngeo/journal/v7/n10/full/ngeo2247.html
Article Global assessment of trends in wetting and drying over land
There is a recent paper by which the author extended the framework by introducing a method to specify probabilistic estimates of water availability.
The link is as follows:
http://onlinelibrary.wiley.com/doi/10.1002/2015GL063449/pdf
Thanks for all the suggestions! For those visiting the EGU General Assembly; this year there is a poster session called "Recent advances and future perspectives of the Budyko water balance framework"
http://meetingorganizer.copernicus.org/EGU2015/posters/18254
There is a paper with some detailisation of the Budyko approach:
http://dx.doi.org/10.1080/00207233.2015.1010876
I consider that Budyko (1974) equation is very good for water balance!
A Budyko-type model for human water consumption
Article A Budyko-type Model for Human Water Consumption
I I think the Budyko framework should evolve to a smaller time scale to expand its applicability. We developed the Budyko framework to the annual time scale in a more concise way.
excellent question, maybe it will involve the scale problem in next step.
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