Publication Abstracts
An and Bong 2018
An, S.-I., and
, 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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