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Irrigation effects on hydro-climatic change: Basin-wise water balance-constrained quantification and cross-regional comparison
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2014 (English)In: Surveys in geophysics, ISSN 0169-3298, E-ISSN 1573-0956, Vol. 35, no 3, 879-895 p.Article in journal (Refereed) Published
Abstract [en]

Hydro-climatic changes driven by human land and water use, including water use for irrigation, may be difficult to distinguish fromthe effects of global, natural and anthropogenic climate change. This paper quantifies and compares the hydro-climatic change effects ofirrigation using a data-driven, basin-wise quantification approach in two different irrigated world regions: the Aral Sea drainage basinin Central Asia, and the Indian Mahanadi River Basin draining into the Bay of Bengal. Results show that irrigation-driven changesin evapotranspiration and latent heat fluxes and associated temperature changes at the land surface may be greater in regions withsmall relative irrigation impacts on water availability in the landscape (here represented by the MRB) than in regions with severe suchimpacts (here represented by the Aral region). Different perspectives on the continental part of Earth’s hydrological cycle may thus implydifferent importance assessment of various drivers and impacts of hydro-climatic change. Regardless of perspective, however, actualbasin-wise water balance constraints should be accounted to realistically understand and accurately quantify continental water change.

Place, publisher, year, edition, pages
2014. Vol. 35, no 3, 879-895 p.
Keyword [en]
hydro-climatic change, irrigation, evapotranspiration, surface temperature, hydrological cycle, hydrological catchment, Aral Sea, India
National Category
Climate Research Physical Geography
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-87957DOI: 10.1007/s10712-013-9223-5ISI: 000333700700018OAI: oai:DiVA.org:su-87957DiVA: diva2:608309
Available from: 2013-02-27 Created: 2013-02-27 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Hydro-climatic changes in irrigated world regions
Open this publication in new window or tab >>Hydro-climatic changes in irrigated world regions
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Understanding of hydro-climatic changes in the world’s river basins is required to ensure future food security. Different regional basins experience different levels of hydro-climatic change depending on the endorheic or exorheic nature of a hydrological basin, along with the climatic conditions and human land and water-use practices, for instance for irrigation. This thesis has analyzed long-term hydro-climatic changes in two main irrigated regions of the world: the Mahanadi River Basin in India and the Aral region in Central Asia. Thesis applies a basin-wise, data-driven water balance-constrained approach to quantifying the hydro-climatic changes, and to distinguish their main drivers in the past century and for future. Results point at human water-use and re-distribution for irrigation within a basin as a major driver of water balance changes, which also affect surface temperature in the region.

Cross-regional comparison focused on the climatically important changes of water, vapor and latent heat fluxes at the land surface, and also on the changes to water resource availability in the landscape. Results show that irrigation- driven changes in evapotranspiration, latent heat fluxes and associated temperature changes at land surface may be greater in regions with small relative irrigation impacts on water availability in the landscape than in regions with severe such impacts. This implies that one cannot from the knowledge about only one aspect of hydro-climatic change simply extrapolate the impact importance of those changes for other types of water changes in a region.

Climate model projections results show lack of consistency in individual GCM performance with regard to temperature and to precipitation, implying difficulties to identify well-performing GCMs with regard to both of these variables in a region. In Aral region, the thesis shows that ensemble mean of different GCM outputs may provide robust projection of future hydro-climate changes.

Place, publisher, year, edition, pages
Stockholm: Department of Physical Geography and Quaternary Geology, Stockholm University, 2013. 30 p.
Series
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 36
Keyword
Climate change, hydro-climatic change, evapotranspiration, irrigation, water demand, water balance, land-use, water-use, hydrological catchment, Aral Sea, India, Mahanadi River Basin
National Category
Climate Research Physical Geography
Research subject
Physical Geography
Identifiers
urn:nbn:se:su:diva-87921 (URN)978-91-7447-641-5 (ISBN)
Public defence
2013-04-03, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
FormasLinnaeus research environment CADICSModelling initiative of the Bert Bolin Centre for Climate ChangeSida - Swedish International Development Cooperation AgencySwedish Research Council, 2006-4366
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Accepted. Paper 6: Manuscript.

Available from: 2013-03-12 Created: 2013-02-25 Last updated: 2013-02-27Bibliographically approved

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