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The Southern Annular Mode: Variability, trends, and climate impacts across the Southern Hemisphere

Wiley Interdisciplinary Reviews: Climate Change, 2020
AbstractThe Southern Annular Mode (SAM) is the leading mode of extratropical Southern Hemisphere climate variability, associated with changes in the strength and position of the polar jet around Antarctica. This variability in the polar jet drives large fluctuations in the Southern Hemisphere climate, from the lower stratosphere into the troposphere ...
Gareth Marshall, Ryan Fogt
exaly   +4 more sources

Southern Annular Mode

The Southern Annular Mode (SAM) is an important pattern of Southern Hemisphere circulation variability: it accounts for between 15 and 30 or more percent of the total variability of the Southern Hemisphere extratropical circulation on daily to annual ...
James A. Renwick, Ryan L. Fogt, Gareth J. Marshall   +2 more
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Multiple Timescales of the Southern Annular Mode

2021
<p>Using the ensemble empirical mode decomposition (EEMD) method, this study systematically investigates the multiple timescales of the Southern Annular Mode (SAM) and identifies their relative contributions to the low-frequency persistence of SAM.
Qiuyan Zhang, Yang Zhang, Zhaohua Wu
openaire   +1 more source

The northern annular mode: More zonal symmetric than the southern annular mode

Science Bulletin, 2008
Fan (2007) recently documented the zonal asymmetry of the Antarctic oscillation (AAO) in the austral winter. In this research, the zonal asymmetry of the northern annular mode, or the Arctic oscillation (AO), in the interannual variability is studied for the boreal winter. It is shown that there is zonal asymmetry of the AO as well, similar to the case
HuiJun Wang, JianQi Sun, JingZhi Su
openaire   +1 more source

The Southern Annular Mode in CMIP6 simulations

2021
<p>Stratospheric ozone depletion, along with increases in long-lived greenhouse gases, is well known to cause a strengthening of the Southern Annular Mode (SAM), the leading mode of variability in the Southern Hemisphere.  I here analyze simulations contributed to CMIP6 for signatures of these two leading drivers of climate ...
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The Southern Annular Mode and opposite-phased Basin Mode of the Southern Ocean circulation

Journal of Oceanography, 2009
Over the Southern Ocean the dominant modes of the atmospheric field are known as the Southern Annular Mode (SAM) or Antarctic Oscillation, and the Pacific South American (PSA) pattern. Statistical analysis of sea surface wind (SSW) from satellite observation revealed two leading modes of SAM-like and PSA patterns.
Yuji Iijima, Shigeru Aoki, Kunio Kutsuwada   +2 more
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Climate Impacts of the Southern Annular Mode Simulated by the CMIP3 Models

Journal of Climate, 2009
Abstract The southern annular mode (SAM) has a well-established impact on climate in the Southern Hemisphere. The strongest response in surface air temperature (SAT) is observed in the Antarctic, but the SAM’s area of influence extends much farther, with statistically significant effects on temperature and precipitation being detected as
Karpechko, Alexey Yu., Gillett, Nathan P., Marshall, Gareth J., Screen, James A.   +3 more
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Southern Africa winter temperature shifts and their link to the Southern Annular Mode

Climate Dynamics, 2015
The main characteristics of spatial and temporal variability of the winter (June–August) observed surface air minimum temperature (SAMT) of southern Africa (Africa south of the equator) were examined from 1960 to 2011. The empirical orthogonal function (EOF) analysis was used to extract the dominant mode of SAMT variability.
Desmond Manatsa, Caxton Matarira, Terrence D. Mushore, Chipo Mudavanhu   +3 more
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Dynamical Feedbacks of the Southern Annular Mode in Winter and Summer

Journal of the Atmospheric Sciences, 2010
Abstract The persistence of the southern annular mode (SAM) is studied during austral winter (June–September) and summer (December–March) using observations of the three-dimensional vorticity budget. Analysis of the relative vorticity tendency equation shows that convergence of eddy vorticity flux in the upper troposphere, coupled with a
Dennis L. Hartmann, Elizabeth A. Barnes
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Change in the Relationship between the Southern Subtropical Dipole Modes and the Southern Annular Mode in the Mid-1980s

Journal of Climate, 2015
Abstract The southern subtropical dipole modes (SSDMs) and southern annular mode (SAM) are important climate modes, which are dominant in the southern middle and high latitudes, respectively, with considerable regional climatic impacts. However, the relationship between the two modes remains unclear.
Gen Li, Li Yan
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