Copyright University of Reading INTER-COMPARISON OF ARCTIC STORMS IN ATMOSPHERIC REANALYSIS DATASETS Alec Vessey (2 nd Year PhD Student) Supervisors: Kevin Hodges (UoR), Len Shaffrey (NCAS/UoR), Jonny Day (ECMWF), Tom Philp (XL Catlin) 1/16 The 7 th European Windstorm Conference 11/10/2018
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Copyright University of Reading
INTER-COMPARISON OF ARCTIC STORMS IN ATMOSPHERIC REANALYSIS DATASETS
Alec Vessey (2nd Year PhD Student)
Supervisors: Kevin Hodges (UoR), Len Shaffrey (NCAS/UoR), Jonny Day (ECMWF),
Tom Philp (XL Catlin) 1/16
The 7th European Windstorm Conference
11/10/2018
MOTIVATION
2/16
Humpert &
Raspotnik
(2012)
Meier et al. (2014)
Less than 1 million km2 Arctic ice extent
in September to occur in 2040s, with the
earliest projections being 2030s.
(Wang and Overland 2012)
NASA (2012)
REANALYSIS DATASETS• Reanalysis datasets are widely used in science and business to examine mobile storms
• Assimilate observations into current models to generate a spatially and temporally
coherent dataset of the past
4/16(ERA-Interim: Dee et al. 2011, JRA-55: Kobayashi et al. 2015, MERRA-2: Gelaro et al. 2017, NCEP-CFSR: Saha et al. 2015)
• Research questions and aims:
• What is the frequency, spatial distribution and intensity of Arctic storms?
• What are the differences in the characteristics of Arctic storms between reanalysis datasets?
• Methodology:
• Compare ERA-Interim, MERRA-2, JRA-55 and NCEP-CFSR, between 1980 – 2017