Biases in southern hemisphere climate trends induced by coarsely specifying the temporal resolution of stratospheric ozone

Neely, III, R. R.; Marsh, D. R.; Smith, K. L.; Davis, S. M.; Polvani, L. M.

doi:10.1002/2014GL061627

Biases in southern hemisphere climate trends induced by coarsely specifying the temporal resolution of stratospheric ozone

Journal Article · Tue Dec 16 00:00:00 EST 2014 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2014GL061627· OSTI ID:1402253

Neely, III, R. R. ^[1]; Marsh, D. R. ^[2]; Smith, K. L. ^[3]; Davis, S. M. ^[4]; Polvani, L. M. ^[3]

NCAR Boulder Colorado USA, National Centre for Atmospheric Science and the Institute of Climate and Atmospheric Science University of Leeds Leeds UK, CIRES University of Colorado Boulder Colorado USA
NCAR Boulder Colorado USA
Columbia University New York New York USA
CIRES University of Colorado Boulder Colorado USA, NOAA Earth System Research Laboratory Chemical Sciences Division Boulder Colorado USA

Abstract

Global climate models that do not include interactive middle atmosphere chemistry, such as most of those contributing to the Coupled Model Intercomparison Project Phase 5, typically specify stratospheric ozone using monthly mean, zonal mean values and linearly interpolate to the time resolution of the model. We show that this method leads to significant biases in the simulated climate of the southern hemisphere (SH) over the late twentieth century. Previous studies have attributed similar biases in simulated SH climate change to the effect of the spatial smoothing of the specified ozone, i.e., to using zonal mean concentrations. We here show that the bias in climate trends due to undersampling of the rapid temporal changes in ozone during the seasonal evolution of the Antarctic ozone hole is considerable and reaches all the way into the troposphere. Our results suggest that the bias can be substantially reduced by specifying daily ozone concentrations.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1402253

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 23 Vol. 41; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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