Improved performance of ERA5 in Arctic gateway relative to four global atmospheric reanalyses


Contact
Marion.Maturilli [ at ] awi.de

Abstract

Here we evaluate five atmospheric reanalyses in an Arctic gateway during late summer. The reanalyses include ERA5, ERA-Interim, JRA-55, CFSv2 and MERRA-2. We use observations from 50 radiosondes launched in the Fram Strait around 79-80˚N, between 25 August – 11 September 2017. Crucially, data from 27 radiosondes were not transmitted to the Global Telecommunications System (GTS), and therefore not assimilated into any reanalysis. In most reanalyses, the magnitude of wind speed and humidity errors are similar for profiles with and without data assimilation. In cases without data assimilation, correlation coefficients (R) exceed 0.88 for temperature, wind speed and specific humidity, in all reanalyses. Overall, the newly released ERA5 has higher correlation coefficients than any other reanalyses as well as smaller biases and root mean square errors, for all three variables. The largest improvements identified in ERA5 are in its representation of the wind field, and temperature profiles over warm water.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
Scopus/ISI peer-reviewed
Publication Status
Published
Eprint ID
49686
DOI 10.1029/2019GL082781

Cite as
Graham, R. M. , Hudson, S. R. and Maturilli, M. (2019): Improved performance of ERA5 in Arctic gateway relative to four global atmospheric reanalyses , Geophysical Research Letters, 46 . doi: 10.1029/2019GL082781


Download
[img]
Preview
PDF
Graham_et_al-2019-Geophysical_Research_Letters.pdf

Download (1MB) | Preview

Share


Citation

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item