Publication Abstracts

Orbe et al. 2020, accepted

Orbe, C., D. Rind, J. Jonas, L. Nazarenko, G. Faluvegi, L.T. Murray, D.T. Shindell, K. Tsigaridis, T. Zhou, M. Kelley, and G. Schmidt, 2020: GISS Model E2.2: A climate model optimized for the middle atmosphere. Part 2: Validation of large-scale transport and evaluation of climate response. J. Geophys. Res. Atmos., accepted.

Here we examine the large-scale transport characteristics of the new "Middle Atmosphere" NASA Goddard Institute for Space Studies climate model (E2.2). First we evaluate the stratospheric transport circulation in historical atmosphere-only simulations integrated with interactive trace gas and aerosol chemistry. Compared to lower vertical resolution model versions, E2.2 exhibits improved tropical ascent and older stratospheric mean ages that are more consistent with observed values. In the troposphere, poleward transport to the Arctic and interhemispheric mean ages in E2.2 are comparable to models participating in the Chemistry Climate Modeling Initiative.

In addition to validating E2.2 we also assess its "transport sensitivity" using the coupled atmosphere-ocean abrupt 4×CO2 and transient 1%CO2 simulations submitted to the Coupled Model Intercomparison Project, Phase 6, along with a 2×CO2 simulation used to evaluate the linearity of the transport circulation's response to increased CO2. We show that decreases (increases) in a stratospheric mean age (idealized surface loss) tracer scale linearly with increased lower stratospheric upwelling, which also increases linearly with warming tropical sea surface temperatures (SSTs). Abrupt 2×CO2 and 4×CO2 experiments constrained with (fixed) pre-industrial SSTs are also used to quantify the relative importance of rapid adjustments versus SST feedbacks to the transport circulation responses in the model. Finally, sensitivity experiments are presented to illustrate the impact of changes in the convective parameterization on stratospheric transport.

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BibTeX Citation

@unpublished{or02200w,
  author={Orbe, C. and Rind, D. and Jonas, J. and Nazarenko, L. and Faluvegi, G. and Murray, L. T. and Shindell, D. T. and Tsigaridis, K. and Zhou, T. and Kelley, M. and Schmidt, G.},
  title={GISS Model E2.2: A climate model optimized for the middle atmosphere. Part 2: Validation of large-scale transport and evaluation of climate response},
  year={2020},
  journal={J. Geophys. Res. Atmos.},
}

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RIS Citation

TY  - INPR
ID  - or02200w
AU  - Orbe, C.
AU  - Rind, D.
AU  - Jonas, J.
AU  - Nazarenko, L.
AU  - Faluvegi, G.
AU  - Murray, L. T.
AU  - Shindell, D. T.
AU  - Tsigaridis, K.
AU  - Zhou, T.
AU  - Kelley, M.
AU  - Schmidt, G.
PY  - 2020
TI  - GISS Model E2.2: A climate model optimized for the middle atmosphere. Part 2: Validation of large-scale transport and evaluation of climate response
JA  - J. Geophys. Res. Atmos.
ER  -

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