Low-Frequency Climate Modes and Antarctic Sea Ice Variations, 1982-2013

Low-Frequency Climate Modes and Antarctic Sea Ice Variations, 1982-2013 AbstractThe NCEP–NCAR composite dataset (comprising sea level pressure, 500hPa geopotential height, 500hPa temperature, and meridional wind stress at 10 m above the surface) is used for compiling a set of climate indices describing the most important physical modes of variability in the Southern Hemisphere (SH), i.e. the Southern Annular Mode (SAM), Semi–Annual Oscillation (SAO), Pacific–South American (PSA) and quasi– stationary Zonal Wavenumber–3 (ZW3) patterns. Compelling evidence indicates that the large increase in the SH sea ice, recorded over recent years, arises from the impact of climate modes and their long–term trends. The examination of variability ranging from seasonal to interdecadal scales, and of trends within the climate patterns and total Antarctic sea ice concentration (SIC) for the 32–yr period (1982–2013) are the key focuses of this paper. Our results indicate that a progressive cooling affected the year–to–year climate of the sub–Antarctic since 1990s. This feature is found in association with increased positive SAM and SAO phases detected in terms of upward annual and seasonal trends (in autumn and summer), and upward decadal trends. In addition, the SIC shows upward annual, spring and summer trends, indicating the insulation of Antarctica from the warmer flows in the midlatitudes. This picture of variations is also found to be consistent with the upward trends detected for the PSA and ZW3 patterns on the annual scale and during the last two decades. Evidence of a more frequent occurrence of the PSA–ZW3 combination could explain, in part, the significant increase of the regional and total Antarctic sea ice coverages. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Climate American Meteorological Society

Low-Frequency Climate Modes and Antarctic Sea Ice Variations, 1982-2013

Journal of Climate , Volume preprint (2017): 1 – Oct 3, 2017

Loading next page...
 
/lp/ams/low-frequency-climate-modes-and-antarctic-sea-ice-variations-1982-2013-lTMFV48qdK
Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0442
D.O.I.
10.1175/JCLI-D-17-0184.1
Publisher site
See Article on Publisher Site

Abstract

AbstractThe NCEP–NCAR composite dataset (comprising sea level pressure, 500hPa geopotential height, 500hPa temperature, and meridional wind stress at 10 m above the surface) is used for compiling a set of climate indices describing the most important physical modes of variability in the Southern Hemisphere (SH), i.e. the Southern Annular Mode (SAM), Semi–Annual Oscillation (SAO), Pacific–South American (PSA) and quasi– stationary Zonal Wavenumber–3 (ZW3) patterns. Compelling evidence indicates that the large increase in the SH sea ice, recorded over recent years, arises from the impact of climate modes and their long–term trends. The examination of variability ranging from seasonal to interdecadal scales, and of trends within the climate patterns and total Antarctic sea ice concentration (SIC) for the 32–yr period (1982–2013) are the key focuses of this paper. Our results indicate that a progressive cooling affected the year–to–year climate of the sub–Antarctic since 1990s. This feature is found in association with increased positive SAM and SAO phases detected in terms of upward annual and seasonal trends (in autumn and summer), and upward decadal trends. In addition, the SIC shows upward annual, spring and summer trends, indicating the insulation of Antarctica from the warmer flows in the midlatitudes. This picture of variations is also found to be consistent with the upward trends detected for the PSA and ZW3 patterns on the annual scale and during the last two decades. Evidence of a more frequent occurrence of the PSA–ZW3 combination could explain, in part, the significant increase of the regional and total Antarctic sea ice coverages.

Journal

Journal of ClimateAmerican Meteorological Society

Published: Oct 3, 2017

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off