Future desertification and climate change

the need for land-surface system evaluation improvement

A. Henderson-Sellers*, P. Irannejad, K. McGuffie

*Corresponding author for this work

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

In already drought-stressed areas and places with the potential for desertification as a result of greenhouse-induced change, high quality model-derived climate projections are essential for sustainable management. Today's challenge is how to select from the plethora of models and proposed new analyses the tools most likely to be valid for areas already water-stressed and those threatened by future surface moisture reduction. Here, the land-surface skills of models involved in the IPCC Fourth Assessment Report and new techniques of isotopic enrichment of components of evapotranspiration are analyzed. Both are found to have shortcomings. Surprisingly poor reporting of fundamental components of the land-surface system in standard model output was the largest challenge for widely accepted models. We show that very few of a large group (20) of today's climate models report land-surface water and energy budgets correctly in a well-controlled international experiment and that most fail basic conservation tests. Our analysis of a smaller (5) experiment suggests that isotopic techniques employed in arid zone irrigation management may not transition to evaluation and model improvement. Land-surface conditions important for policy are found to be poorly reported which raises questions about equal weighting given by international assessments to all models: good and bad.

Original languageEnglish
Pages (from-to)129-138
Number of pages10
JournalGlobal and Planetary Change
Volume64
Issue number3-4
DOIs
Publication statusPublished - Dec 2008

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