globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00382-017-3843-2
Scopus记录号: 2-s2.0-85026797029
论文题名:
A stochastic model with a low-frequency amplification feedback for the stratospheric northern annular mode
作者: Yu Y.; Cai M.; Ren R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期:2018-09-10
起始页码: 3757
结束页码: 3773
语种: 英语
英文关键词: Linear stochastic model with a low-frequency amplification feedback ; Polar stratospheric mass ; Poleward mass transport ; Stratospheric NAM variability
Scopus关键词: Arctic Oscillation ; climate feedback ; feedback mechanism ; meridional circulation ; planetary wave ; stochasticity ; stratosphere ; stratosphere-troposphere interaction
英文摘要: We consider three indices to measure the polar stratospheric mass and stratospheric meridional mass circulation variability: anomalies of (1) total mass in the polar stratospheric cap (60–90°N, above the isentropic surface 400 K, PSM), (2) total adiabatic mass transport across 60°N into the polar stratosphere cap (AMT), (3) and total diabetic mass transport across 400 K from the polar stratosphere into the troposphere below (DMT). It is confirmed that the negative stratospheric Northern Annular Mode (NAM) and PSM indices have a nearly indistinguishable temporal evolution and a similar red-noise-like spectrum with a de-correlation timescale of 4 weeks. This enables us to examine the low-frequency nature of the NAM in the framework of mass circulation, namely, ddtPSM=AMT-DMT. The DMT index tends to be positively correlated with the PSM with a red-noise-like spectrum, representing slow radiative cooling processes giving rise to a de-correlation timescale of 3–4 weeks. The AMT is nearly perfectly correlated with the day-to-day tendency of PSM, reflecting a robust quasi 90° out-of-phase relation between the AMT and PSM at all frequency bands. Variations of vertically westward tilting of planetary waves contribute mainly to the high-frequency portion of AMT. It is the wave amplitude’s slow vacillation that plays the leading role in the quasi 90° out-of-phase relation between the AMT and PSM. Based on this, we put forward a linear stochastic model with a low-frequency amplification feedback from low-frequency amplitude vacillations of planetary waves to explain the amplified low-frequency response of PSM/NAM to a stochastic forcing from the westward tilting variability. © 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/109342
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: Nanjing University of Information Science and Technology, Nanjing, China; Geophysical Fluid Dynamics Institute, Florida State University, Tallahassee, FL, United States; Department of Earth, Ocean and Atmospheric Sciences, Florida State University, 1017 Academic Way, Tallahassee, FL, United States; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Collaborative Innovation Center on Forecasts and Evaluation of Meteorological Disasters and KLME, Nanjing University of Information Science and Technology, Nanjing, China

Recommended Citation:
Yu Y.,Cai M.,Ren R.. A stochastic model with a low-frequency amplification feedback for the stratospheric northern annular mode[J]. Climate Dynamics,2018-01-01,50(2018-09-10)
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