Publication Abstracts

Zhu et al. 2017

Zhu, J., Z. Liu, E. Brady, B. Otto-Bliesner, J. Zhang, D. Noone, R. Tomas, J. Nusbaumer, T. Wong, A. Jahn, and C. Tabor, 2017: Reduced ENSO variability at the LGM revealed by an isotope-enabled Earth system model. Geophys. Res. Lett., 44, no. 13, 6984-6992, doi:10.1002/2017GL073406.

Studying the El Niño-Southern Oscillation (ENSO) in the past can help us better understand its dynamics and improve its future projections. However, both paleoclimate reconstructions and model simulations of ENSO strength at the Last Glacial Maximum (LGM; 21 ka B.P.) have led to contradicting results. Here we perform model simulations using the recently developed water isotope-enabled Community Earth System Model (iCESM). For the first time, model-simulated oxygen isotopes are directly compared with those from ENSO reconstructions using the individual foraminifera analysis (IFA). We find that the LGM ENSO is most likely weaker comparing with the preindustrial. The iCESM suggests that total variance of the IFA records may only reflect changes in the annual cycle instead of ENSO variability as previously assumed. Furthermore, the interpretation of subsurface IFA records can be substantially complicated by the habitat depth of thermocline-dwelling foraminifera and their vertical migration with a temporally varying thermocline.

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BibTeX Citation

@article{zh08200c,
  author={Zhu, J. and Liu, Z. and Brady, E. and Otto-Bliesner, B. and Zhang, J. and Noone, D. and Tomas, R. and Nusbaumer, J. and Wong, T. and Jahn, A. and Tabor, C.},
  title={Reduced ENSO variability at the LGM revealed by an isotope-enabled Earth system model},
  year={2017},
  journal={Geophys. Res. Lett.},
  volume={44},
  number={13},
  pages={6984--6992},
  doi={10.1002/2017GL073406},
  isbn={1944-8007}
}

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RIS Citation

TY  - JOUR
ID  - zh08200c
AU  - Zhu, J.
AU  - Liu, Z.
AU  - Brady, E.
AU  - Otto-Bliesner, B.
AU  - Zhang, J.
AU  - Noone, D.
AU  - Tomas, R.
AU  - Nusbaumer, J.
AU  - Wong, T.
AU  - Jahn, A.
AU  - Tabor, C.
PY  - 2017
TI  - Reduced ENSO variability at the LGM revealed by an isotope-enabled Earth system model
JA  - Geophys. Res. Lett.
VL  - 44
IS  - 13
SP  - 6984
EP  - 6992
DO  - 10.1002/2017GL073406
SN  - 1944-8007
ER  -

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