Threshold of the volcanic forcing that leads the El Nino-like warming in the last millennium: results from the ERIK simulation
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Title
- Threshold of the volcanic forcing that leads the El Nino-like warming in the last millennium: results from the ERIK simulation
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Author(s)
- Lim, Hyung-Gyu; Yeh, Sang-Wook; Kug, Jong-Seong; Park, Young-Gyu; Park, Jae-Hun; Park, Rokjin; Song, Chang-Keun
- KIOST Author(s)
- Lim, Hyung-Gyu(임형규); Park, Young Gyu(박영규)
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Alternative Author(s)
- 임형규; 박영규
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Publication Year
- 2016-06
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Abstract
- In order to examine the threshold of the volcanic forcing that leads to the El Nino-like warming, we analyze a millennium ERIK simulation (AD 1000-1850) forced by three external forcings including greenhouse gases, solar forcing and volcanic eruptions using the ECHO-G coupled climate model. It is found that there exists a threshold of the volcanic forcing above 15 W/m(2) to lead the El Nino-like warming in the climate model. When the volcanic forcing is above this threshold forcing, then the intensity of the Inter-tropical Convergence Zone (ITCZ) is weakened and its position is shifted to the south. This might be associated with the processes of less evaporation in the subtropical cloudless region by a cooling due to the reduction of net surface shortwave radiation. Concurrently, a weakening of ITCZ is associated with a weakening of the trade winds and the subsequent Bjerknes feedback causes El Nino-like warming. Therefore, El Nino-like warming events can occur when volcanic eruption is above threshold forcing, implying that there exists a certain level of radiative forcing change which is capable of changing the state of tropical Pacific sea surface temperature. The last millennium simulation of Paleoclimate Modeling Intercomparison Project Phase 3 climate models also indicates that there may exist a threshold forcing to lead the El Nino-like warming, which has been also discussed in the present study.
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ISSN
- 0930-7575
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/2185
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DOI
- 10.1007/s00382-015-2799-3
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Bibliographic Citation
- CLIMATE DYNAMICS, v.46, no.11-12, pp.3725 - 3736, 2016
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Publisher
- SPRINGER
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Type
- Article
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Language
- English
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Document Type
- Article
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