globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00382-017-3954-9
Scopus记录号: 2-s2.0-85032809164
论文题名:
Comparison of the effect of land-sea thermal contrast on interdecadal variations in winter and summer blockings
作者: He Y.; Huang J.; Li D.; Xie Y.; Zhang G.; Qi Y.; Wang S.; Totz S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期:4
起始页码: 1275
结束页码: 1294
语种: 英语
英文关键词: Asymmetric warming ; Blocking ; Double-jet ; Land-sea thermal contrast
Scopus关键词: atmospheric blocking ; CMIP ; comparative study ; decadal variation ; global warming ; jet stream ; summer ; winter
英文摘要: The influence of winter and summer land-sea surface thermal contrast on blocking for 1948–2013 is investigated using observations and the coupled model intercomparison project outputs. The land-sea index (LSI) is defined to measure the changes of zonal asymmetric thermal forcing under global warming. The summer LSI shows a slower increasing trend than winter during this period. For the positive of summer LSI, the EP flux convergence induced by the land-sea thermal forcing in the high latitude becomes weaker than normal, which induces positive anomaly of zonal-mean westerly and double-jet structure. Based on the quasiresonance amplification mechanism, the narrow and reduced westerly tunnel between two jet centers provides a favor environment for more frequent blocking. Composite analysis demonstrates that summer blocking shows an increasing trend of event numbers and a decreasing trend of durations. The numbers of the short-lived blocking persisting for 5–9 days significantly increases and the numbers of the long-lived blocking persisting for longer than 10 days has a weak increase than that in negative phase of summer LSI. The increasing transient wave activities induced by summer LSI is responsible for the decreasing duration of blockings. The increasing blocking due to summer LSI can further strengthen the continent warming and increase the summer LSI, which forms a positive feedback. The opposite dynamical effect of LSI on summer and winter blocking are discussed and found that the LSI-blocking negative feedback partially reduces the influence of the above positive feedback and induce the weak summer warming rate. © 2017, Springer-Verlag GmbH Germany.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109175
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, Gansu 73000, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu, China; Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province and Key Open Laboratory of Arid Climate Change and Disaster Reduction of CMA, Institute of Arid Meteorology CMA, Lanzhou, Gansu, China; Department of Physics, University of Potsdam, Potsdam, Germany

Recommended Citation:
He Y.,Huang J.,Li D.,et al. Comparison of the effect of land-sea thermal contrast on interdecadal variations in winter and summer blockings[J]. Climate Dynamics,2018-01-01,51(4)
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