A synoptic-climatology of Northern Hemisphere, cold season polar and subtropical jet superposition events

A synoptic-climatology of Northern Hemisphere, cold season polar and subtropical jet... AbstractNarrow, tropopause-level wind speed maxima known as jet streams or jets are among the most ubiquitous structural characteristics of the Earth’s atmosphere. Two species, the polar and subtropical jets, can be observed on any given day. The polar jet is tied, via eddy momemtum flux convergence associated with extratropical wave development, to the troposphere-deep baroclinicity of the middle latitudes while the subtropical jet is tied, by angular momentum constraints, to the poleward edge of the tropical Hadley Cell. As a consequence of their different origins, the polar and subtropical jets are separated by both latitude and elevation. However, there are times when these two usually separate features become vertically superposed to form a single, intense jet core designated as a jet superposition or superposed jet.An objective method for identifying tropopause-level jets is employed in the construction of 50-year cold season (NDJFM) synoptic-climatologies of the Northern Hemisphere polar jet, subtropical jet, and jet superpositions. The analysis demonstrates that while superposition events are relatively rare, there are clear geographical maxima. Superpositions are most frequent in the western Pacific from December through February, with a secondary peak in southern North America and along its eastern seaboard. Consistent with expectations, the spatiotemporal maxima in jet superpositions appear to be coincident with maxima in the polar and subtropical jets. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Climate American Meteorological Society

A synoptic-climatology of Northern Hemisphere, cold season polar and subtropical jet superposition events

Loading next page...
 
/lp/ams/a-synoptic-climatology-of-northern-hemisphere-cold-season-polar-and-6fAF0rRxui
Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0442
D.O.I.
10.1175/JCLI-D-16-0565.1
Publisher site
See Article on Publisher Site

Abstract

AbstractNarrow, tropopause-level wind speed maxima known as jet streams or jets are among the most ubiquitous structural characteristics of the Earth’s atmosphere. Two species, the polar and subtropical jets, can be observed on any given day. The polar jet is tied, via eddy momemtum flux convergence associated with extratropical wave development, to the troposphere-deep baroclinicity of the middle latitudes while the subtropical jet is tied, by angular momentum constraints, to the poleward edge of the tropical Hadley Cell. As a consequence of their different origins, the polar and subtropical jets are separated by both latitude and elevation. However, there are times when these two usually separate features become vertically superposed to form a single, intense jet core designated as a jet superposition or superposed jet.An objective method for identifying tropopause-level jets is employed in the construction of 50-year cold season (NDJFM) synoptic-climatologies of the Northern Hemisphere polar jet, subtropical jet, and jet superpositions. The analysis demonstrates that while superposition events are relatively rare, there are clear geographical maxima. Superpositions are most frequent in the western Pacific from December through February, with a secondary peak in southern North America and along its eastern seaboard. Consistent with expectations, the spatiotemporal maxima in jet superpositions appear to be coincident with maxima in the polar and subtropical jets.

Journal

Journal of ClimateAmerican Meteorological Society

Published: Jun 20, 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