Prominent Precession Band Variance in ENSO Intensity Over the Last 300,000 Years
Three transient National Center for Atmospheric Research Community Climate System Model, version 3 model simulations were analyzed to study the responses of El Nino-Southern Oscillation (ENSO) and the equatorial Pacific annual cycle (AC) to external forcings over the last 300,000 years. The time-var...
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ftchinacascieeca:oai:ir.ieecas.cn:361006/13307 2023-06-11T04:12:49+02:00 Prominent Precession Band Variance in ENSO Intensity Over the Last 300,000 Years Lu, Zhengyao Liu, Zhengyu Chen, Guangshan Guan, Jian 2019-08-28 http://ir.ieecas.cn/handle/361006/13306 http://ir.ieecas.cn/handle/361006/13307 https://doi.org/10.1029/2019GL083410 英语 eng AMER GEOPHYSICAL UNION GEOPHYSICAL RESEARCH LETTERS http://ir.ieecas.cn/handle/361006/13306 http://ir.ieecas.cn/handle/361006/13307 doi:10.1029/2019GL083410 EL-NINO TROPICAL PACIFIC SURFACE-TEMPERATURE SOUTHERN-OSCILLATION ANNUAL CYCLE CLIMATE MIDHOLOCENE VARIABILITY SUPPRESSION MODEL Geology Geosciences Multidisciplinary 期刊论文 2019 ftchinacascieeca https://doi.org/10.1029/2019GL083410 2023-05-08T13:24:21Z Three transient National Center for Atmospheric Research Community Climate System Model, version 3 model simulations were analyzed to study the responses of El Nino-Southern Oscillation (ENSO) and the equatorial Pacific annual cycle (AC) to external forcings over the last 300,000 years. The time-varying boundary conditions of insolation, greenhouse gases, and continental ice sheets, accelerated by a factor of 100, were sequentially added in these simulations. The simulated ENSO and AC amplitudes change in phase, and both have pronounced precession band variance (similar to 21,000 years). The precession-modulated slow (orbital time scales) ENSO evolution is dominated linearly by the change of the coupled ocean-atmosphere instability, notably the Ekman upwelling feedback and thermocline feedback. In contrast, the greenhouse gases and ice sheet forcings (similar to 100,000-year cycles) are opposed to each other as they influence ENSO variability through changes in AC amplitude via a common nonlinear frequency entrainment mechanism. The acceleration technique could dampen and delay the precession signals below the surface ocean associated with ENSO intensity. Plain Language Summary El Nino-Southern Oscillation in the equatorial Pacific Ocean is the largest oscillating year-to-year climate variability. We study the evolution of El Nino during the past 300,000 years using climate model simulations. How the slow time-varying changes in insolation, greenhouse gases concentration, and continental ice sheets could influence the behaviors of El Nino are taken into account. Our simulation results suggest that the evolution of the El Nino intensity is dominated by the insolation forcing on the precession time scale (similar to 21,000 years) and can be explained by the strength of coupled ocean-atmosphere feedbacks that control the growth of El Nino. On the other hand, the greenhouse gas and ice sheet forcings (in similar to 100,000-year cycles) tend to compensate each other as they slightly influence El Nifio-Southern ... Report Ice Sheet Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) Pacific Geophysical Research Letters 46 16 9786 9795 |
institution |
Open Polar |
collection |
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascieeca |
language |
English |
topic |
EL-NINO TROPICAL PACIFIC SURFACE-TEMPERATURE SOUTHERN-OSCILLATION ANNUAL CYCLE CLIMATE MIDHOLOCENE VARIABILITY SUPPRESSION MODEL Geology Geosciences Multidisciplinary |
spellingShingle |
EL-NINO TROPICAL PACIFIC SURFACE-TEMPERATURE SOUTHERN-OSCILLATION ANNUAL CYCLE CLIMATE MIDHOLOCENE VARIABILITY SUPPRESSION MODEL Geology Geosciences Multidisciplinary Lu, Zhengyao Liu, Zhengyu Chen, Guangshan Guan, Jian Prominent Precession Band Variance in ENSO Intensity Over the Last 300,000 Years |
topic_facet |
EL-NINO TROPICAL PACIFIC SURFACE-TEMPERATURE SOUTHERN-OSCILLATION ANNUAL CYCLE CLIMATE MIDHOLOCENE VARIABILITY SUPPRESSION MODEL Geology Geosciences Multidisciplinary |
description |
Three transient National Center for Atmospheric Research Community Climate System Model, version 3 model simulations were analyzed to study the responses of El Nino-Southern Oscillation (ENSO) and the equatorial Pacific annual cycle (AC) to external forcings over the last 300,000 years. The time-varying boundary conditions of insolation, greenhouse gases, and continental ice sheets, accelerated by a factor of 100, were sequentially added in these simulations. The simulated ENSO and AC amplitudes change in phase, and both have pronounced precession band variance (similar to 21,000 years). The precession-modulated slow (orbital time scales) ENSO evolution is dominated linearly by the change of the coupled ocean-atmosphere instability, notably the Ekman upwelling feedback and thermocline feedback. In contrast, the greenhouse gases and ice sheet forcings (similar to 100,000-year cycles) are opposed to each other as they influence ENSO variability through changes in AC amplitude via a common nonlinear frequency entrainment mechanism. The acceleration technique could dampen and delay the precession signals below the surface ocean associated with ENSO intensity. Plain Language Summary El Nino-Southern Oscillation in the equatorial Pacific Ocean is the largest oscillating year-to-year climate variability. We study the evolution of El Nino during the past 300,000 years using climate model simulations. How the slow time-varying changes in insolation, greenhouse gases concentration, and continental ice sheets could influence the behaviors of El Nino are taken into account. Our simulation results suggest that the evolution of the El Nino intensity is dominated by the insolation forcing on the precession time scale (similar to 21,000 years) and can be explained by the strength of coupled ocean-atmosphere feedbacks that control the growth of El Nino. On the other hand, the greenhouse gas and ice sheet forcings (in similar to 100,000-year cycles) tend to compensate each other as they slightly influence El Nifio-Southern ... |
format |
Report |
author |
Lu, Zhengyao Liu, Zhengyu Chen, Guangshan Guan, Jian |
author_facet |
Lu, Zhengyao Liu, Zhengyu Chen, Guangshan Guan, Jian |
author_sort |
Lu, Zhengyao |
title |
Prominent Precession Band Variance in ENSO Intensity Over the Last 300,000 Years |
title_short |
Prominent Precession Band Variance in ENSO Intensity Over the Last 300,000 Years |
title_full |
Prominent Precession Band Variance in ENSO Intensity Over the Last 300,000 Years |
title_fullStr |
Prominent Precession Band Variance in ENSO Intensity Over the Last 300,000 Years |
title_full_unstemmed |
Prominent Precession Band Variance in ENSO Intensity Over the Last 300,000 Years |
title_sort |
prominent precession band variance in enso intensity over the last 300,000 years |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2019 |
url |
http://ir.ieecas.cn/handle/361006/13306 http://ir.ieecas.cn/handle/361006/13307 https://doi.org/10.1029/2019GL083410 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
GEOPHYSICAL RESEARCH LETTERS http://ir.ieecas.cn/handle/361006/13306 http://ir.ieecas.cn/handle/361006/13307 doi:10.1029/2019GL083410 |
op_doi |
https://doi.org/10.1029/2019GL083410 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
container_issue |
16 |
container_start_page |
9786 |
op_container_end_page |
9795 |
_version_ |
1768388917970599936 |