Developing water change spectra and distinguishing change drivers worldwide

Jaramillo, Fernando; Destouni, Georgia

doi:10.1002/2014gl061848

Cited by 110 publications

(131 citation statements)

References 26 publications

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“…If the movement is only due to change in the aridity index ( (E 0 /P )), the movement will occur along the corresponding Budyko-type curve to a new point (t 2 * : E 0 /P 2 * , E/P 2 * ), implying a change in the evaporative ratio, termed henceforth as the climatic effect ( (E/P ) c ). However, a basin will most certainly move in time due to a combination of change in the aridity index and other drivers of change Jaramillo and Destouni, 2014). Under such realistic circumstances, the basin will move to a new location not falling on the initial Budyko-type curve (t 2 : E 0 /P 2 , E/P 2 ), implying a corresponding observed total change in the evaporative ratio ( (E/P )).…”

Section: Budyko Frameworkmentioning

confidence: 99%

“…The roses illustrate in the same plot the combination of changes in the aridity index and evaporative ratios for all basins. It is worth noting that since the magnitude and direction of change in Budyko space depends on the specific hydroclimatic conditions of each basin Gudmundsson et al, 2016;Jaramillo and Destouni, 2014) and on the definition of the space in which such movement occurs, such wind roses oversimplify the variability of movements in Budyko space. However, using these wind roses is a simple way to synthesize general tendencies of movement in large sets of basins and enables a first-order identification of the importance of drivers of change different from the aridity index.…”

Section: Budyko Frameworkmentioning

confidence: 99%

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Dominant effect of increasing forest biomass on evapotranspiration: interpretations of movement in Budyko space

Jaramillo

Cory

Arheimer

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. During the last 6 decades, forest biomass has increased in Sweden mainly due to forest management, with a possible increasing effect on evapotranspiration. However, increasing global CO 2 concentrations may also trigger physiological water-saving responses in broadleaf tree species, and to a lesser degree in some needleleaf conifer species, inducing an opposite effect. Additionally, changes in other forest attributes may also affect evapotranspiration. In this study, we aimed to detect the dominating effect(s) of forest change on evapotranspiration by studying changes in the ratio of actual evapotranspiration to precipitation, known as the evaporative ratio, during the period 1961-2012. We first used the Budyko framework of water and energy availability at the basin scale to study the hydroclimatic movements in Budyko space of 65 temperate and boreal basins during this period. We found that movements in Budyko space could not be explained by climatic changes in precipitation and potential evapotranspiration in 60 % of these basins, suggesting the existence of other dominant drivers of hydroclimatic change. In both the temperate and boreal basin groups studied, a negative climatic effect on the evaporative ratio was counteracted by a positive residual effect. The positive residual effect occurred along with increasing standing forest biomass in the temperate and boreal basin groups, increasing forest cover in the temperate basin group and no apparent changes in forest species composition in any group. From the three forest attributes, standing forest biomass was the one that could explain most of the variance of the residual effect in both basin groups. These results further suggest that the water-saving response to increasing CO 2 in these forests is either negligible or overridden by the opposite effect of the increasing forest biomass. Thus, we conclude that increasing standing forest biomass is the dominant driver of long-term and large-scale evapotranspiration changes in Swedish forests.

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Section: Budyko Frameworkmentioning

confidence: 99%

Section: Budyko Frameworkmentioning

confidence: 99%

Dominant effect of increasing forest biomass on evapotranspiration: interpretations of movement in Budyko space

Jaramillo

Cory

Arheimer

et al. 2018

Hydrol. Earth Syst. Sci.

Self Cite

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“…Water 2016, 8,458 11 of 17 management programs of the Chinese government [24], green water consumption should be taken into account in studies of water consumption and water availability [60] in the Loess Plateau. …”

Section: Quantifying the Runoff Response To Climate And Anthropogenicmentioning

confidence: 99%

Reduced Runoff Due to Anthropogenic Intervention in the Loess Plateau, China

Liu

Zhang

et al. 2016

Water

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Abstract:To maintain the sustainable utilization of water resources and reduce soil erosion in the Loess Plateau, the Chinese government has adopted a number of environmental restoration strategies since 1999, including the Grain for Green Project (GFGP) and the Natural Forest Conservation Program; these large projects greatly alter the regional water cycle. Detecting runoff changes and quantitatively assessing the contribution of anthropogenic activities (including land use/cover change (LUCC) and water diversion) and climate change (including potential evaporation and precipitation) are imperative for implementing sustainable management strategies. Using observed records from 15 hydrological stations and 85 national meteorological stations from 1980 to 2013, the decomposition method, based on the Budyko hypothesis, is used to quantify the impact of climate variation and anthropogenic interference on annual runoff for the 12 catchments in the Loess Plateau. The results show the following: (1) the observed annual runoff exhibited a negative trend in all 12 catchments (significant in eight catchments) with a range of −1.94 to −0.16 mm·year −1 and exhibited a substantial difference before and after 1999; (2) the sensitivity of runoff to vegetation change, precipitation, and potential evapotranspiration increased in most catchments after 1999, indicating that great challenges and uncertainties might be introduced to regional water resource availability; and (3) the anthropogenic interference, particularly LUCC caused by forest strategies, has become the main contribution to runoff change. We suggest that more attention should be given to water resource availability and that the hydrologic consequences of revegetation should be taken into account in future management.

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“…Conditions under which the framework is not valid can occur, e.g., at subannual or interannual timescales due to changes in terrestrial water storage terms such as soil moisture, groundwater or snow storage. Additional water might be also introduced by landscape changes (Jaramillo and Destouni, 2015), human interventions (Milly et al, 2008) or phase changes of water within the system or supplied through precipitation (Jaramillo and Destouni, 2015;Berghuijs et al, 2014). Also long-term changes in soil moisture may happen, e.g., under transient climate change (Wang, 2005;Orlowsky and Seneviratne, 2013).…”

Section: Introductionmentioning

confidence: 99%

A two-parameter Budyko function to represent conditions under which evapotranspiration exceeds precipitation

Greve

Gudmundsson

Orlowsky

et al. 2016

Hydrol. Earth Syst. Sci.

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Abstract. A comprehensive assessment of the partitioning of precipitation (P ) into evapotranspiration (E) and runoff (Q) is of major importance for a wide range of socio-economic sectors. For climatological averages, the Budyko framework provides a simple first-order relationship to estimate water availability represented by the ratio E / P as a function of the aridity index (E p /P , with E p denoting potential evaporation). However, the Budyko framework is limited to steadystate conditions, being a result of assuming negligible storage change in the land-water balance. Processes leading to changes in the terrestrial water storage at any spatial and/or temporal scale are hence not represented. Here we propose an analytically derived modification of the Budyko framework including a new parameter explicitly representing additional water available to evapotranspiration besides instantaneous precipitation. The modified framework is comprehensively analyzed, showing that the additional parameter leads to a rotation of the original water supply limit. We further evaluate the new formulation in an example application at mean seasonal timescales, showing that the extended framework is able to represent conditions in which monthly to annual evapotranspiration exceeds monthly to annual precipitation.

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Developing water change spectra and distinguishing change drivers worldwide

Cited by 110 publications

References 26 publications

Dominant effect of increasing forest biomass on evapotranspiration: interpretations of movement in Budyko space

Dominant effect of increasing forest biomass on evapotranspiration: interpretations of movement in Budyko space

Reduced Runoff Due to Anthropogenic Intervention in the Loess Plateau, China

A two-parameter Budyko function to represent conditions under which evapotranspiration exceeds precipitation

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