Publication Abstracts

Silber et al. 2019

Silber, I., J. Verlinde, S.-H. Wang, D.H. Bromwick, A.M. Fridlind, M. Cadeddu, E.W. Eloranta, and C.J. Flynn, 2019: Cloud influence on ERA5 and AMPS surface downwelling longwave radiation biases in West Antarctica. J. Climate, 32, no. 22, 7935-7949, doi:10.1175/JCLI-D-19-0149.1.

The surface downwelling longwave radiation component (LW) is crucial for the determination of the surface energy budget and has significant implications for the resilience of ice surfaces in the polar regions. Accurate model evaluation of this radiation component requires knowledge about the phase, vertical distribution, and associated temperature of water in the atmosphere, all of which control the LW signal measured at the surface. In this study, we examine the LW model errors found in the Antarctic Mesoscale Prediction System (AMPS) operational forecast model and the ERA5 reanalysis model relative to observations from the ARM West Antarctic Radiation Experiment (AWARE) campaign at McMurdo Station and the West Antarctic Ice Sheet (WAIS) Divide. The errors are calculated separately for observed clear sky conditions, ice cloud occurrences, and liquid-bearing cloud layer (LBCL) occurrences. The analysis results show a tendency in both models at each site to underestimate the LW during clear sky conditions, high error variability (standard deviations > 20 W/m2) during any type of cloud occurrence, and negative LW biases when LBCLs are observed (bias magnitudes > 15 W/m2 in tenuous LBCL cases; > 43 W/m2 in optically thick/opaque LBCLs instances). We suggest that a generally dry and liquid-deficient atmosphere responsible for the identified LW biases in both models is the result of excessive ice formation and growth, which could stem from the models initial and lateral boundary conditions, microphysics scheme, aerosol representation, and/or the limited vertical resolution.

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BibTeX Citation

  author={Silber, I. and Verlinde, J. and Wang, S.-H. and Bromwick, D. H. and Fridlind, A. M. and Cadeddu, M. and Eloranta, E. W. and Flynn, C. J.},
  title={Cloud influence on ERA5 and AMPS surface downwelling longwave radiation biases in West Antarctica},
  journal={J. Climate},

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RIS Citation

ID  - si02300g
AU  - Silber, I.
AU  - Verlinde, J.
AU  - Wang, S.-H.
AU  - Bromwick, D. H.
AU  - Fridlind, A. M.
AU  - Cadeddu, M.
AU  - Eloranta, E. W.
AU  - Flynn, C. J.
PY  - 2019
TI  - Cloud influence on ERA5 and AMPS surface downwelling longwave radiation biases in West Antarctica
JA  - J. Climate
VL  - 32
IS  - 22
SP  - 7935
EP  - 7949
DO  - 10.1175/JCLI-D-19-0149.1
ER  -

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