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DOI | 10.1029/2018GL078495 |
A Robust Increase of the Intraseasonal Periodic Behavior of the Precipitation and Eddy Kinetic Energy in a Warming Climate | |
Wang, Lei1,2; Lu, Jian3; Kuang, Zhiming1,2 | |
2018-08-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:15页码:7790-7799 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Precipitation and storm track activity in the Southern Hemisphere feature a remarkable 20 to 30-day periodicity known as baroclinic annular mode. In climate model projections following the representative concentration pathway 8.5 scenario, this work finds a robust increase of intraseasonal variability of the precipitation and density-weighted eddy kinetic energy at the 20-30 day frequency range by 25% and 20%, respectively, in austral summer toward the end of the century, despite small changes in seasonal-mean quantities at corresponding latitudes. These results suggest that a warming climate can feature a stronger dynamical organization of the 20-30 day periodicity by the moist baroclinic waves. For austral winter, the weak 20-30 day periodicity in the current climate becomes a prominent mode of quasiperiodic variability toward the end of the century in these model projections. This work identifies both the increase of diabatic heating and the enhancements of the waveguide effects as candidate mechanisms. Plain Language Summary This work reports a robust increase of the intraseasonal periodic behavior in the Southern Hemisphere storm track with important implications on midlatitude hydrological extremes. While it is well-documented that the jet stream will shift poleward in a warming climate, this is the first contribution that identifies how the intraseasonal variability of the storm tracks would change in response to global warming in comprehensive climate models (National Center for Atmospheric Research Large Ensemble project and CMIP5 outputs). Evidence suggests that both the increase of moisture and the change of a climatological basic state can contribute to the intensification of the intraseasonal variability, which implies a more predictable baroclinic annular mode in the Southern Hemisphere in a warmer climate. This finding serves as a stimulus for future studies to unveil the role of changing diabatic heating on the intraseasonal variability in the midlatitudes. |
英文关键词 | intraseasonal variability baroclinic annular mode precipitation eddy kinetic energy storm track climate change |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000443129500062 |
WOS关键词 | HEMISPHERE ATMOSPHERIC CIRCULATION ; AMPLITUDE WAVE ACTIVITY ; ZONAL-MEAN FLOW ; SOUTHERN-HEMISPHERE ; STORM TRACKS ; 21ST-CENTURY CLIMATE ; VARIABILITY ; COVARIATION ; SIMULATIONS ; SUMMER |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28745 |
专题 | 气候变化 |
作者单位 | 1.Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA; 2.Harvard Univ, John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA; 3.Pacific Northwest Natl Lab, Atmospher Sci & Global Change Div, Richland, WA 99352 USA |
推荐引用方式 GB/T 7714 | Wang, Lei,Lu, Jian,Kuang, Zhiming. A Robust Increase of the Intraseasonal Periodic Behavior of the Precipitation and Eddy Kinetic Energy in a Warming Climate[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(15):7790-7799. |
APA | Wang, Lei,Lu, Jian,&Kuang, Zhiming.(2018).A Robust Increase of the Intraseasonal Periodic Behavior of the Precipitation and Eddy Kinetic Energy in a Warming Climate.GEOPHYSICAL RESEARCH LETTERS,45(15),7790-7799. |
MLA | Wang, Lei,et al."A Robust Increase of the Intraseasonal Periodic Behavior of the Precipitation and Eddy Kinetic Energy in a Warming Climate".GEOPHYSICAL RESEARCH LETTERS 45.15(2018):7790-7799. |
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