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Developing water change spectra and distinguishingchange drivers worldwide
Stockholm University, Faculty of Science, Department of Physical Geography. (Hydrology)ORCID iD: 0000-0001-5978-9884
Stockholm University, Faculty of Science, Department of Physical Geography. (Hydrology)
2014 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 41, no 23, 8377-8386 p.Article in journal (Refereed) Published
Abstract [en]

The separate and combined effects of different drivers of change to water fluxes and resources onland (CWOL) remain difficult to distinguish and largely unknown, particularly at a global scale. Our studyanalyzes CWOL during the period 1901–2008, based on available hydroclimatic data for up to 859 hydrologicalbasins. We develop a worldwide spectrum of change magnitudes and directions in Budyko space, from whichwe distinguish climate and landscape drivers of CWOL. We find that landscape drivers (e.g., changes in landand water use, water storage or water phase) are needed to explain CWOL in at least 74% of the basins studied.The water change effects of such landscape drivers are mostly opposite to those of atmospheric climatechange. The change spectrum approach we developed provides a useful tool for quantifying and visualizingCWOL and for distinguishing the effects of climate and landscape drivers across regions and scales.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2014. Vol. 41, no 23, 8377-8386 p.
Keyword [en]
budyko, runoff, precipitation, evapotranspiration, evaporative index, land use, water use, worldwide
National Category
Physical Geography Climate Research Oceanography, Hydrology, Water Resources
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:su:diva-113099DOI: 10.1002/2014GL061848ISI: 000348462000031OAI: oai:DiVA.org:su-113099DiVA: diva2:782998
Projects
VR, project 2009-3221
Funder
Swedish Research Council, 2009-3221A multiscale, cross‐disciplinary approach to the study of climate change effect on ecosystem services and biodiversity
Available from: 2015-01-23 Created: 2015-01-23 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Changes in the Freshwater System: Distinguishing Climate and Landscape Drivers
Open this publication in new window or tab >>Changes in the Freshwater System: Distinguishing Climate and Landscape Drivers
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Freshwater is a vital resource that circulates between the atmosphere, the land and the sea. Understanding and quantifying changes to the partitioning of precipitation into evapotranspiration, runoff and water storage change in the landscape are required for assessing changes to freshwater availability. However, the partitioning processes and their changes are complex due to multiple change drivers and effects. This thesis investigates and aims to identify and separate the effects of atmospheric climate change and various landscape drivers on long-term freshwater change. This is done based on hydroclimatic, land-use and water-use data from the beginning of the twentieth century up to present times and across different regions and scales, from catchment to global. The analyzed landscape drivers include historic developments of irrigated and non-irrigated agriculture and flow regulation. The thesis uses and develops further a data-motivated approach to interpret available hydroclimatic and landscape data for identification of water change drivers and effects, expanding the approach application from local to continental and global scales. Based on this approach development, the thesis identifies hydroclimatic change signals of landscape drivers against the background of multiple coexisting drivers influencing worldwide freshwater change, within and among hydrological basins. Globally, landscape drivers are needed to explain more than 70% of the historic hydroclimatic changes, of which a considerable proportion may be directly human-driven. These landscape- and human-driven water changes need to be considered and accounted for also in modeling and projection of changes to the freshwater system on land.

Place, publisher, year, edition, pages
Stockholm: Department of Physical Geography, Stockholm University, 2015. 84 p.
Series
Dissertations from the Department of Physical Geography, ISSN 1653-7211 ; 47
Keyword
Budyko, evapotranspiration, freshwater, hydrology, hydroclimatic change, landscape change, land use, observation data, runoff, separation, water partitioning, water storage change, water use, worldwide
National Category
Oceanography, Hydrology, Water Resources Physical Geography Climate Research
Research subject
Physical Geography
Identifiers
urn:nbn:se:su:diva-113101 (URN)978-91-7649-092-1 (ISBN)
Public defence
2015-03-05, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 13:00 (English)
Opponent
Supervisors
Projects
VR, project 2009-3221
Funder
Swedish Research Council, 2009-3221A multiscale, cross‐disciplinary approach to the study of climate change effect on ecosystem services and biodiversity
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Submitted.

Available from: 2015-02-11 Created: 2015-01-23 Last updated: 2015-01-29Bibliographically approved

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