reference : Projections of 21st century climate of the Columbia River Basin

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/reference/07aed96a-e0e8-47dd-81d3-cdff5a6e261c
Bibliographic fields
reftype Journal Article
Abstract Simulations from 35 global climate models (GCMs) in the Coupled Model Intercomparison Project Phase 5 provide projections of 21st century climate in the Columbia River Basin under scenarios of anthropogenic activity given by Representative Concentration Pathways (RCP4.5 and RCP8.5). The multi-model ensemble 30-year mean annual temperature increases by 2.8 °C (5.0 °C) by late 21st century under RCP4.5 (RCP8.5) over the 1979–1990 baseline, with 18% (24%) more warming in summer. By late 21st century, annual precipitation increases by 5% (8%), with an 8% (14%) winter increase and a 4% (10%) summer decrease, but because some models project changes of opposite sign, confidence in these sign changes is lower than those for temperature. Four questions about temperature and precipitation changes were addressed: (1) How and why do climate projections vary seasonally? (2) Is interannual variability in seasonal temperature and precipitation projected to change? (3) What explains the large inter-model spread in the projections? (4) Do projected changes in climate depend on model skill? Changes in precipitation and temperature vary seasonally as a result of changes in large-scale circulation and regional surface energy budget, respectively. Interannual temperature variability decreases slightly during the cool seasons and increases in summer, while interannual precipitation variability increases in all seasons. The magnitude of regional warming is linked to models’ global climate sensitivity, whereas internal variability dominates the inter-model spread of precipitation changes. Lastly, GCMs that better reproduce historical climate tend to project greater warming and larger precipitation increases, though these results depend on the evaluation method.
Author Rupp, David E.; Abatzoglou, John T.; Mote, Philip W.
DOI 10.1007/s00382-016-3418-7
Date September 01
ISSN 1432-0894
Issue 5
Journal Climate Dynamics
Pages 1783-1799
Title Projections of 21st century climate of the Columbia River Basin
Type of Article journal article
Volume 49
Year 2017
Bibliographic identifiers
_record_number 24626
_uuid 07aed96a-e0e8-47dd-81d3-cdff5a6e261c