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Vapor flux by evapotranspiration: effects of changes in climate, land-use and water-use
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2010 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 115, no D24Article in journal (Refereed) Published
Abstract [en]

Enhanced evapotranspiration (ET) over irrigated land and associated latent heat flux change can modify the climate. Model studies of such climate change effects of irrigation are commonly based on land use parameterizations, in terms of irrigated land area, or land area equipped for irrigation. Actual ET change, however, may also be driven by water use change in addition to land use change. This study quantifies and compares ET changes due to changes in climate, land use, and water use from the preirrigation period 1901–1955 to the recent period 1990–2000 (with irrigation) for the example case of Mahanadi River Basin (MRB) in India. The results show that actual water use per unit area of irrigated land may vary greatly over a hydrological drainage basin. In MRB, much higher water use per irrigated land unit in the downstream humid basin parts leads to higher vapor flux by ET, and irrigation‐induced ET flux change, than in the upstream, water‐stressed basin parts. This is consistent with water supply limitations in water‐stressed basins. In contrast, the assumption in land use−based models that irrigation maintains high soil moisture contents can imply higher modeled water use and therefore also higher modeled ET fluxes under dry conditions than under humid conditions. The present results indicate water use as an important driver of regional climate change, in addition to land use and greenhouse gas‐driven changes.

Place, publisher, year, edition, pages
2010. Vol. 115, no D24
Keyword [en]
evapotranspiration, water use, land use, climate change
National Category
Climate Research Physical Geography
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-51192DOI: 10.1029/2010JD014417OAI: oai:DiVA.org:su-51192DiVA: diva2:384424
Available from: 2011-01-10 Created: 2011-01-10 Last updated: 2017-12-11Bibliographically 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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