Publication Abstracts

An and Bong 2018

An, S.-I., and H. Bong, 2018: Feedback process responsible for the suppression of ENSO activity during the mid-Holocene. Theor. Appl. Climatol., 132, no. 3, 779-790, doi:10.1007/s00704-017-2117-6.

Using the output of 12 models from the Paleoclimate Modeling Intercomparison Project Phase 3, we investigate the feedback process responsible for changes in El Niño-Southern Oscillation activity during the mid-Holocene based on a linear stability index (Bjerknes stability index; BJ index) analysis. The multi-model ensemble mean (MME) variance of the Niño-3.4 index (sea surface temperature anomalies averaged over 5°S-5°N, 170°-120°W) simulated for 6000 years ago (6 kya) was 13% lower than that for the pre-industrial era (0 kya), while changes in the MME BJ index were negligible. This is due to a balance between enhanced damping by anomalous thermal advection by mean currents (MA) and enhanced positive thermocline feedback (TH). Seven of the models show that MME variance of the Niño-3.4 and BJ indexes for the 6 kya run is 21 and 70% lower, respectively, than the 0 kya run. However, two models show the opposite change. Interestingly, MA in both model groups increases, especially due to the mean meridional current associated with enhanced trade winds, indicating a robust mechanism. The opposite tendency between the two groups is mainly due to large TH in the second group 6 kya, as a result of enhanced air-sea coupling and strongly reduced ocean stratification due to subsurface warming, which led to increased sensitivity of the zonal thermocline contrast to surface zonal wind stress.

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BibTeX Citation

@article{an00300e,
  author={An, S.-I. and Bong, H.},
  title={Feedback process responsible for the suppression of ENSO activity during the mid-Holocene},
  year={2018},
  journal={Theoretical and Applied Climatology},
  volume={132},
  number={3},
  pages={779--790},
  doi={10.1007/s00704-017-2117-6},
}

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RIS Citation

TY  - JOUR
ID  - an00300e
AU  - An, S.-I.
AU  - Bong, H.
PY  - 2018
TI  - Feedback process responsible for the suppression of ENSO activity during the mid-Holocene
JA  - Theor. Appl. Climatol.
JO  - Theoretical and Applied Climatology
VL  - 132
IS  - 3
SP  - 779
EP  - 790
DO  - 10.1007/s00704-017-2117-6
ER  -

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