Publication Abstracts

Zhang et al. 2023

Zhang, X., D.W. Waugh, and C. Orbe, 2023: Dependence of Northern Hemisphere tropospheric transport on the midlatitude jet under abrupt CO2 increase. J. Geophys. Res. Atmos., 128, no. 13, e2022JD038454, doi:10.1029/2022JD038454.

Understanding how the transport of gases and aerosols responds to climate change is necessary for policy making and emission controls. There is considerable spread in model projections of tracer transport in climate change simulations, largely because of the substantial uncertainty in projected changes in the large-scale atmospheric circulation. In particular, a relationship between the response of tropospheric transport into the high latitudes and a shift of the midlatitude jet has been previously established in an idealized modeling study. To test the robustness of this relationship, we analyze the response of a passive tracer of northern midlatitude surface origin to abrupt 2×CO2 and 4×CO2 in a comprehensive climate model (GISS E2.2-G). We show that a poleward shift of the northern midlatitude jet and enhanced eddy mixing along isentropes on the poleward flank of the jet result in decreased tracer concentrations over the midlatitudes and increased concentrations over the Arctic. This mechanism is robust in abrupt 2×CO2 and 4×CO2 simulations, the nonlinearity to CO2 forcing, and two versions of the model with different atmospheric chemistry. Preliminary analysis of realistic chemical tracers suggests that the same mechanism can be used to provide insights into the climate change response of anthropogenic pollutants.

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BibTeX Citation

@article{zh03500b,
  author={Zhang, X. and Waugh, D. W. and Orbe, C.},
  title={Dependence of Northern Hemisphere tropospheric transport on the midlatitude jet under abrupt CO2 increase},
  year={2023},
  journal={J. Geophys. Res. Atmos.},
  volume={128},
  number={13},
  pages={e2022JD038454},
  doi={10.1029/2022JD038454},
}

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RIS Citation

TY  - JOUR
ID  - zh03500b
AU  - Zhang, X.
AU  - Waugh, D. W.
AU  - Orbe, C.
PY  - 2023
TI  - Dependence of Northern Hemisphere tropospheric transport on the midlatitude jet under abrupt CO2 increase
JA  - J. Geophys. Res. Atmos.
VL  - 128
IS  - 13
SP  - e2022JD038454
DO  - 10.1029/2022JD038454
ER  -

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