Evaluation of Downscaled CMIP5 Coupled with VIC Model for Flash Drought Simulation in a Humid Subtropical Basin, China

Evaluation of Downscaled CMIP5 Coupled with VIC Model for Flash Drought Simulation in a Humid... AbstractCompared to traditional drought events, flash droughts evolve rapidly during short-term extreme atmospheric conditions, with a lasting period of one pentad to several weeks. There are two main categories of flash droughts: the heat wave flash drought (HWFD), which is mainly caused by persistent high temperatures (heat waves), and the precipitation deficit flash drought (PDFD), which is mainly triggered by precipitation deficits. Our previous research focused on the characteristics and causes of flash drought based on meteorological observations and Variable Infiltration Capacity (VIC) simulations in a humid subtropical basin (Gan River Basin, China). In this study, we evaluated the downscaled Coupled Model Intercomparsion Project Phase 5 (CMIP5) coupled with the VIC model (CMIP5-VIC) in reproducing flash droughts in a humid subtropical basin in China. Most downscaled CMIP5-VIC simulations can reproduce the spatial patterns of flash droughts with respect to the benchmarks. The coupled models fail to readily replicate interannual variation (interannual pentad change), but most models can reflect the interannual variability (temporal standard deviation) and long-term average pentads of flash droughts. It is difficult to simultaneously depict both the spatial and temporal features of flash droughts within only one coupled model. The climatological patterns of the best multi-model ensemble mean are close to those of the all-models ensemble mean, but the best multi-model ensemble mean has a minimal bias range and relatively low computational burden. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Climate American Meteorological Society

Evaluation of Downscaled CMIP5 Coupled with VIC Model for Flash Drought Simulation in a Humid Subtropical Basin, China

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0442
D.O.I.
10.1175/JCLI-D-17-0378.1
Publisher site
See Article on Publisher Site

Abstract

AbstractCompared to traditional drought events, flash droughts evolve rapidly during short-term extreme atmospheric conditions, with a lasting period of one pentad to several weeks. There are two main categories of flash droughts: the heat wave flash drought (HWFD), which is mainly caused by persistent high temperatures (heat waves), and the precipitation deficit flash drought (PDFD), which is mainly triggered by precipitation deficits. Our previous research focused on the characteristics and causes of flash drought based on meteorological observations and Variable Infiltration Capacity (VIC) simulations in a humid subtropical basin (Gan River Basin, China). In this study, we evaluated the downscaled Coupled Model Intercomparsion Project Phase 5 (CMIP5) coupled with the VIC model (CMIP5-VIC) in reproducing flash droughts in a humid subtropical basin in China. Most downscaled CMIP5-VIC simulations can reproduce the spatial patterns of flash droughts with respect to the benchmarks. The coupled models fail to readily replicate interannual variation (interannual pentad change), but most models can reflect the interannual variability (temporal standard deviation) and long-term average pentads of flash droughts. It is difficult to simultaneously depict both the spatial and temporal features of flash droughts within only one coupled model. The climatological patterns of the best multi-model ensemble mean are close to those of the all-models ensemble mean, but the best multi-model ensemble mean has a minimal bias range and relatively low computational burden.

Journal

Journal of ClimateAmerican Meteorological Society

Published: Nov 21, 2017

References

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