Inertia-Gravity Waves Revealed in Radiosonde Data at Jang Bogo Station, Antarctica (74°37′S, 164°13′E): 1. Characteristics, Energy, and Momentum Flux

J. H. Yoo, T. Choi, Hye-Yeong Chun, Y. H. Kim, I. S. Song, B. G. Song

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Characteristics of inertia-gravity waves (IGWs) at high latitude in Antarctica are investigated using radiosondes launched daily at Jang Bogo Station (74°37′S, 164°13′E), a new Antarctic station that has been operating since 2014, in the troposphere (z = 2–7 km) and lower stratosphere (z = 15–22 km) for 25 months (December 2014 to December 2016). The vertical propagation of IGWs exhibits strong seasonal variations in the stratosphere, with an enhancement (reduction) in downward (upward)-propagating IGWs from May to mid-October. In the troposphere, both upward- and downward-propagating IGWs have similar occurrence rates without seasonal variations. The intrinsic phase velocity of IGWs mostly direct to the west (isotropic), while the ground-relative phase and group velocities are dominant in the east and southeast (northeast), respectively, in the stratosphere (troposphere). The intrinsic frequency, vertical wavelength, and horizontal wavelength of IGWs averaged in the troposphere (stratosphere) are 3.57f (1.93f; where f is the Coriolis parameter), 1.48 (1.48) km, and 63.06 (221.81) km, respectively. The wave energy in the stratosphere has clear seasonal variations with large values in autumn and spring, while that in the troposphere is smaller without obvious seasonal variations. Zonal and meridional momentum fluxes averaged in the stratosphere (troposphere) are −0.008 (−0.0018) and −0.0005 (0.001) m 2 /s 2 , respectively. The momentum flux of downward-propagating IGWs in the stratosphere is mostly positive in both zonal and meridional directions, whereas the directional preference is not obvious in the troposphere. In Part 2, sources of the observed IGWs in the troposphere and stratosphere will be examined.

Original languageEnglish
Pages (from-to)13,305-13,331
JournalJournal of Geophysical Research: Atmospheres
Volume123
Issue number23
DOIs
Publication statusPublished - 2018 Dec 16

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Radiosondes
radiosondes
Upper atmosphere
Troposphere
Gravity waves
momentum
Antarctic regions
radiosonde
gravity waves
stratosphere
troposphere
gravity
inertia
gravity wave
Antarctica
Momentum
stations
Fluxes
energy
annual variations

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

Cite this

@article{0a9de879601f454aa1a4a29f136126ab,
title = "Inertia-Gravity Waves Revealed in Radiosonde Data at Jang Bogo Station, Antarctica (74°37′S, 164°13′E): 1. Characteristics, Energy, and Momentum Flux",
abstract = "Characteristics of inertia-gravity waves (IGWs) at high latitude in Antarctica are investigated using radiosondes launched daily at Jang Bogo Station (74°37′S, 164°13′E), a new Antarctic station that has been operating since 2014, in the troposphere (z = 2–7 km) and lower stratosphere (z = 15–22 km) for 25 months (December 2014 to December 2016). The vertical propagation of IGWs exhibits strong seasonal variations in the stratosphere, with an enhancement (reduction) in downward (upward)-propagating IGWs from May to mid-October. In the troposphere, both upward- and downward-propagating IGWs have similar occurrence rates without seasonal variations. The intrinsic phase velocity of IGWs mostly direct to the west (isotropic), while the ground-relative phase and group velocities are dominant in the east and southeast (northeast), respectively, in the stratosphere (troposphere). The intrinsic frequency, vertical wavelength, and horizontal wavelength of IGWs averaged in the troposphere (stratosphere) are 3.57f (1.93f; where f is the Coriolis parameter), 1.48 (1.48) km, and 63.06 (221.81) km, respectively. The wave energy in the stratosphere has clear seasonal variations with large values in autumn and spring, while that in the troposphere is smaller without obvious seasonal variations. Zonal and meridional momentum fluxes averaged in the stratosphere (troposphere) are −0.008 (−0.0018) and −0.0005 (0.001) m 2 /s 2 , respectively. The momentum flux of downward-propagating IGWs in the stratosphere is mostly positive in both zonal and meridional directions, whereas the directional preference is not obvious in the troposphere. In Part 2, sources of the observed IGWs in the troposphere and stratosphere will be examined.",
author = "Yoo, {J. H.} and T. Choi and Hye-Yeong Chun and Kim, {Y. H.} and Song, {I. S.} and Song, {B. G.}",
year = "2018",
month = "12",
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Inertia-Gravity Waves Revealed in Radiosonde Data at Jang Bogo Station, Antarctica (74°37′S, 164°13′E) : 1. Characteristics, Energy, and Momentum Flux. / Yoo, J. H.; Choi, T.; Chun, Hye-Yeong; Kim, Y. H.; Song, I. S.; Song, B. G.

In: Journal of Geophysical Research: Atmospheres, Vol. 123, No. 23, 16.12.2018, p. 13,305-13,331.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Inertia-Gravity Waves Revealed in Radiosonde Data at Jang Bogo Station, Antarctica (74°37′S, 164°13′E)

T2 - 1. Characteristics, Energy, and Momentum Flux

AU - Yoo, J. H.

AU - Choi, T.

AU - Chun, Hye-Yeong

AU - Kim, Y. H.

AU - Song, I. S.

AU - Song, B. G.

PY - 2018/12/16

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