nerc.ac.uk

Early‐to-late winter 20th century North Atlantic multidecadal atmospheric variability in observations, CMIP5 and CMIP6

Bracegirdle, T.J. ORCID: https://orcid.org/0000-0002-8868-4739. 2022 Early‐to-late winter 20th century North Atlantic multidecadal atmospheric variability in observations, CMIP5 and CMIP6. Geophysical Research Letters, 49 (11), e2022GL098212. 9, pp. 10.1029/2022GL098212

Before downloading, please read NORA policies.
[thumbnail of Open Access]
Preview
Text (Open Access)
© 2022. The Authors.
Geophysical Research Letters - 2022 - Bracegirdle - Early‐to‐Late Winter 20th Century North Atlantic Multidecadal.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (1MB) | Preview

Abstract/Summary

The strong multi-decadal variability in North Atlantic (NA) winter atmospheric circulation is poorly understood and appears too weak in climate models. Recent research has shown peak atmospheric multi-decadal variability over the NA in late winter, particularly March, linked to Atlantic multi-decadal variability (AMV) of the ocean. Here a range of NA atmospheric circulation indices are assessed to provide a comprehensive picture of early-to-late winter low-frequency variability and its representation in the latest generation of climate models (Coupled Model Intercomparison Project Phase 6 (CMIP6)). As found for CMIP5, CMIP6 models exhibit too-weak multi-decadal NA atmospheric variability compared to reanalysis data over the period 1862-2005. Consistent with previous research, the eastern part of the NA westerly jet (U700NA) exhibits peak low-frequency variability in March. However, for NA-wide jet speed and the NAO, low-frequency variability and model-reanalysis discrepancies are strongest in January and February, associated with too-weak NA ocean-atmosphere linkages.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2022GL098212
ISSN: 0094-8276
Additional Keywords: CMIP5, CMIP6, Low frequency variability, climate model, reanalysis
Date made live: 30 May 2022 09:32 +0 (UTC)
URI: https://nora.nerc.ac.uk/id/eprint/532678

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...