Intraseasonal variability of the zonal-mean extratropical tropopause height

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The physical processes that drive the fluctuations of the extratropical tropopause height are examined with the National Centers for Environmental Prediction-National Center for Atmospheric Research (NCEP-NCAR) reanalysis data. A composite zonal-mean heat budget analysis for the Northern Hemisphere winter shows that fluctuations in the extratropical tropopause height result not only from a warming of the troposphere but also from an even stronger cooling of the lower stratosphere. While the tropospheric warming is caused by a poleward eddy heat transport associated with baroclinic eddies, the stratospheric cooling is driven primarily by planetary-scale waves. The results from analyses of synoptic- and planetary-scale eddy kinetic energy and Eliassen-Palm fluxes are consistent with the planetary waves first gaining their energy within the troposphere, and then propagating vertically into the stratosphere. For the Southern Hemisphere, while lower-stratospheric temperature anomalies still play an important role for the fluctuations in the tropopause height, the temperature anomalies are accounted for primarily by a poleward eddy heat transport associated with synoptic-scale eddies, and by diabatic heating. These results indicate that, although the height of the extratropical tropopause is modulated by baroclinic eddies, which is consistent with existing theories, the amount of the modulation is highly influenced by stratospheric processes.

Original languageEnglish (US)
Pages (from-to)608-620
Number of pages13
JournalJournal of the Atmospheric Sciences
Volume64
Issue number2
DOIs
StatePublished - Feb 1 2007

Fingerprint

tropopause
eddy
temperature anomaly
stratosphere
troposphere
warming
cooling
heat budget
planetary wave
kinetic energy
Southern Hemisphere
Northern Hemisphere
heating
winter
prediction
energy

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

@article{993f3ba137b84d67ab653500c19ea6a0,
title = "Intraseasonal variability of the zonal-mean extratropical tropopause height",
abstract = "The physical processes that drive the fluctuations of the extratropical tropopause height are examined with the National Centers for Environmental Prediction-National Center for Atmospheric Research (NCEP-NCAR) reanalysis data. A composite zonal-mean heat budget analysis for the Northern Hemisphere winter shows that fluctuations in the extratropical tropopause height result not only from a warming of the troposphere but also from an even stronger cooling of the lower stratosphere. While the tropospheric warming is caused by a poleward eddy heat transport associated with baroclinic eddies, the stratospheric cooling is driven primarily by planetary-scale waves. The results from analyses of synoptic- and planetary-scale eddy kinetic energy and Eliassen-Palm fluxes are consistent with the planetary waves first gaining their energy within the troposphere, and then propagating vertically into the stratosphere. For the Southern Hemisphere, while lower-stratospheric temperature anomalies still play an important role for the fluctuations in the tropopause height, the temperature anomalies are accounted for primarily by a poleward eddy heat transport associated with synoptic-scale eddies, and by diabatic heating. These results indicate that, although the height of the extratropical tropopause is modulated by baroclinic eddies, which is consistent with existing theories, the amount of the modulation is highly influenced by stratospheric processes.",
author = "Son, {Seok Woo} and Sukyoung Lee and Feldstein, {Steven B.}",
year = "2007",
month = "2",
day = "1",
doi = "10.1175/JAS3855.1",
language = "English (US)",
volume = "64",
pages = "608--620",
journal = "Journals of the Atmospheric Sciences",
issn = "0022-4928",
publisher = "American Meteorological Society",
number = "2",

}

Intraseasonal variability of the zonal-mean extratropical tropopause height. / Son, Seok Woo; Lee, Sukyoung; Feldstein, Steven B.

In: Journal of the Atmospheric Sciences, Vol. 64, No. 2, 01.02.2007, p. 608-620.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Intraseasonal variability of the zonal-mean extratropical tropopause height

AU - Son, Seok Woo

AU - Lee, Sukyoung

AU - Feldstein, Steven B.

PY - 2007/2/1

Y1 - 2007/2/1

N2 - The physical processes that drive the fluctuations of the extratropical tropopause height are examined with the National Centers for Environmental Prediction-National Center for Atmospheric Research (NCEP-NCAR) reanalysis data. A composite zonal-mean heat budget analysis for the Northern Hemisphere winter shows that fluctuations in the extratropical tropopause height result not only from a warming of the troposphere but also from an even stronger cooling of the lower stratosphere. While the tropospheric warming is caused by a poleward eddy heat transport associated with baroclinic eddies, the stratospheric cooling is driven primarily by planetary-scale waves. The results from analyses of synoptic- and planetary-scale eddy kinetic energy and Eliassen-Palm fluxes are consistent with the planetary waves first gaining their energy within the troposphere, and then propagating vertically into the stratosphere. For the Southern Hemisphere, while lower-stratospheric temperature anomalies still play an important role for the fluctuations in the tropopause height, the temperature anomalies are accounted for primarily by a poleward eddy heat transport associated with synoptic-scale eddies, and by diabatic heating. These results indicate that, although the height of the extratropical tropopause is modulated by baroclinic eddies, which is consistent with existing theories, the amount of the modulation is highly influenced by stratospheric processes.

AB - The physical processes that drive the fluctuations of the extratropical tropopause height are examined with the National Centers for Environmental Prediction-National Center for Atmospheric Research (NCEP-NCAR) reanalysis data. A composite zonal-mean heat budget analysis for the Northern Hemisphere winter shows that fluctuations in the extratropical tropopause height result not only from a warming of the troposphere but also from an even stronger cooling of the lower stratosphere. While the tropospheric warming is caused by a poleward eddy heat transport associated with baroclinic eddies, the stratospheric cooling is driven primarily by planetary-scale waves. The results from analyses of synoptic- and planetary-scale eddy kinetic energy and Eliassen-Palm fluxes are consistent with the planetary waves first gaining their energy within the troposphere, and then propagating vertically into the stratosphere. For the Southern Hemisphere, while lower-stratospheric temperature anomalies still play an important role for the fluctuations in the tropopause height, the temperature anomalies are accounted for primarily by a poleward eddy heat transport associated with synoptic-scale eddies, and by diabatic heating. These results indicate that, although the height of the extratropical tropopause is modulated by baroclinic eddies, which is consistent with existing theories, the amount of the modulation is highly influenced by stratospheric processes.

UR - http://www.scopus.com/inward/record.url?scp=33847670072&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847670072&partnerID=8YFLogxK

U2 - 10.1175/JAS3855.1

DO - 10.1175/JAS3855.1

M3 - Article

AN - SCOPUS:33847670072

VL - 64

SP - 608

EP - 620

JO - Journals of the Atmospheric Sciences

JF - Journals of the Atmospheric Sciences

SN - 0022-4928

IS - 2

ER -