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Title: Tropospheric Waveguide Teleconnections and Their Seasonality

Abstract

Abstract One-point correlation maps of the subseasonal variability of 200-hPa meridional wind in nature and an atmospheric general circulation model are systematically analyzed to quantify the impact of the climatological-mean jets on tropospheric covariability as a result of the jets acting as waveguides for the propagation of Rossby waves. As anticipated by linear theory, signatures of jet influence are detected in terms of (i) the geographical position of the strongest teleconnections, (ii) the zonal orientation and extent of prominent patterns of variability, and (iii) the scale of the features that make up those patterns. Further evidence of jet waveguide influence comes from examining the seasonality of these teleconnection attributes. During winter, covariability can be essentially circumglobal, while during summer it tends to be confined within two separate sectors of the globe where the jets are especially strong. Experiments with a multilevel linear planetary wave model confirm that the analyzed characteristics of teleconnections in the waveguides can be attributed to the action of the mean state; no organization to the anomalous forcing of the atmosphere is required to produce these properties. Some attributes, however, depend on the presence of zonal variations in the climatological-mean state that are of similar scale tomore » the teleconnection patterns themselves.« less

Authors:
 [1];  [1]
  1. National Center for Atmospheric Research,a Boulder, Colorado
Publication Date:
Research Org.:
University Corporation for Atmospheric Research, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1353143
Alternate Identifier(s):
OSTI ID: 1536993
Grant/Contract Number:  
FC02-97ER62402
Resource Type:
Published Article
Journal Name:
Journal of the Atmospheric Sciences
Additional Journal Information:
Journal Name: Journal of the Atmospheric Sciences Journal Volume: 74 Journal Issue: 5; Journal ID: ISSN 0022-4928
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Dynamics; Rossby waves; Teleconnections; Interannual variability; Intraseasonal variability; Seasonal variability

Citation Formats

Branstator, Grant, and Teng, Haiyan. Tropospheric Waveguide Teleconnections and Their Seasonality. United States: N. p., 2017. Web. doi:10.1175/JAS-D-16-0305.1.
Branstator, Grant, & Teng, Haiyan. Tropospheric Waveguide Teleconnections and Their Seasonality. United States. doi:10.1175/JAS-D-16-0305.1.
Branstator, Grant, and Teng, Haiyan. Wed . "Tropospheric Waveguide Teleconnections and Their Seasonality". United States. doi:10.1175/JAS-D-16-0305.1.
@article{osti_1353143,
title = {Tropospheric Waveguide Teleconnections and Their Seasonality},
author = {Branstator, Grant and Teng, Haiyan},
abstractNote = {Abstract One-point correlation maps of the subseasonal variability of 200-hPa meridional wind in nature and an atmospheric general circulation model are systematically analyzed to quantify the impact of the climatological-mean jets on tropospheric covariability as a result of the jets acting as waveguides for the propagation of Rossby waves. As anticipated by linear theory, signatures of jet influence are detected in terms of (i) the geographical position of the strongest teleconnections, (ii) the zonal orientation and extent of prominent patterns of variability, and (iii) the scale of the features that make up those patterns. Further evidence of jet waveguide influence comes from examining the seasonality of these teleconnection attributes. During winter, covariability can be essentially circumglobal, while during summer it tends to be confined within two separate sectors of the globe where the jets are especially strong. Experiments with a multilevel linear planetary wave model confirm that the analyzed characteristics of teleconnections in the waveguides can be attributed to the action of the mean state; no organization to the anomalous forcing of the atmosphere is required to produce these properties. Some attributes, however, depend on the presence of zonal variations in the climatological-mean state that are of similar scale to the teleconnection patterns themselves.},
doi = {10.1175/JAS-D-16-0305.1},
journal = {Journal of the Atmospheric Sciences},
number = 5,
volume = 74,
place = {United States},
year = {2017},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1175/JAS-D-16-0305.1

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Works referencing / citing this record:

Global Search for Autumn‐Lead Sea Surface Salinity Predictors of Winter Precipitation in Southwestern United States
journal, August 2018

  • Liu, T.; Schmitt, R. W.; Li, L.
  • Geophysical Research Letters, Vol. 45, Issue 16
  • DOI: 10.1029/2018gl079293

Global Search for Autumn‐Lead Sea Surface Salinity Predictors of Winter Precipitation in Southwestern United States
journal, August 2018

  • Liu, T.; Schmitt, R. W.; Li, L.
  • Geophysical Research Letters, Vol. 45, Issue 16
  • DOI: 10.1029/2018gl079293