The balance of global angular momentum in a long-term atmospheric data set

Huei-Ping Huang, Prashant D. Sardeshmukh, Klaus M. Weickmann

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

The balance of global atmospheric angular momentum is examined in a long time series of "reanalysis" data generated at the National Centers for Environmental Prediction (NCEP). A systematic negative bias of about -10 Hadleys (1018 kg m2 s-2) is obtained in the total torque in all seasons. The sum of the frictional (TF) and mountain (TM) torques contributes about half of this negative bias in the northern summer and autumn. The torque due to the parameterized gravity wave drag, TG, contributes the other half of the negative bias in summer but contributes the whole of it in winter. In the annual mean the projected angular momentum imbalance due to TG exceeds that due to TM + TF. Consistent with the budget analysis of the assimilated data, losses of angular momentum are also found in an extensive set of medium-range forecasts made with the NCEP reanalysis model. The average rates of loss of relative angular momentum in these forecasts, -7 Hadleys in January and -6 in July, are comparable to the bias of the total torque in the angular momentum budget. Further investigations are suggested to determine the model error, especially that associated with the parameterized gravity wave drag, related to the budget imbalance found in this study.

Original languageEnglish (US)
Article number1998JD200068
Pages (from-to)2031-2040
Number of pages10
JournalJournal of Geophysical Research: Atmospheres
Volume104
Issue numberD2
StatePublished - 1999
Externally publishedYes

Fingerprint

Angular momentum
angular momentum
torque
Torque
wave drag
budgets
Gravity waves
gravity waves
mountains
gravity wave
forecasting
drag
summer
Drag
mountain
autumn
prediction
predictions
winter
Time series

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Huang, H-P., Sardeshmukh, P. D., & Weickmann, K. M. (1999). The balance of global angular momentum in a long-term atmospheric data set. Journal of Geophysical Research: Atmospheres, 104(D2), 2031-2040. [1998JD200068].

The balance of global angular momentum in a long-term atmospheric data set. / Huang, Huei-Ping; Sardeshmukh, Prashant D.; Weickmann, Klaus M.

In: Journal of Geophysical Research: Atmospheres, Vol. 104, No. D2, 1998JD200068, 1999, p. 2031-2040.

Research output: Contribution to journalArticle

Huang, H-P, Sardeshmukh, PD & Weickmann, KM 1999, 'The balance of global angular momentum in a long-term atmospheric data set', Journal of Geophysical Research: Atmospheres, vol. 104, no. D2, 1998JD200068, pp. 2031-2040.
Huang, Huei-Ping ; Sardeshmukh, Prashant D. ; Weickmann, Klaus M. / The balance of global angular momentum in a long-term atmospheric data set. In: Journal of Geophysical Research: Atmospheres. 1999 ; Vol. 104, No. D2. pp. 2031-2040.
@article{9205621d7c16456f9d8d6432695561c5,
title = "The balance of global angular momentum in a long-term atmospheric data set",
abstract = "The balance of global atmospheric angular momentum is examined in a long time series of {"}reanalysis{"} data generated at the National Centers for Environmental Prediction (NCEP). A systematic negative bias of about -10 Hadleys (1018 kg m2 s-2) is obtained in the total torque in all seasons. The sum of the frictional (TF) and mountain (TM) torques contributes about half of this negative bias in the northern summer and autumn. The torque due to the parameterized gravity wave drag, TG, contributes the other half of the negative bias in summer but contributes the whole of it in winter. In the annual mean the projected angular momentum imbalance due to TG exceeds that due to TM + TF. Consistent with the budget analysis of the assimilated data, losses of angular momentum are also found in an extensive set of medium-range forecasts made with the NCEP reanalysis model. The average rates of loss of relative angular momentum in these forecasts, -7 Hadleys in January and -6 in July, are comparable to the bias of the total torque in the angular momentum budget. Further investigations are suggested to determine the model error, especially that associated with the parameterized gravity wave drag, related to the budget imbalance found in this study.",
author = "Huei-Ping Huang and Sardeshmukh, {Prashant D.} and Weickmann, {Klaus M.}",
year = "1999",
language = "English (US)",
volume = "104",
pages = "2031--2040",
journal = "Journal of Geophysical Research: Atmospheres",
issn = "2169-897X",
publisher = "Wiley-Blackwell",
number = "D2",

}

TY - JOUR

T1 - The balance of global angular momentum in a long-term atmospheric data set

AU - Huang, Huei-Ping

AU - Sardeshmukh, Prashant D.

AU - Weickmann, Klaus M.

PY - 1999

Y1 - 1999

N2 - The balance of global atmospheric angular momentum is examined in a long time series of "reanalysis" data generated at the National Centers for Environmental Prediction (NCEP). A systematic negative bias of about -10 Hadleys (1018 kg m2 s-2) is obtained in the total torque in all seasons. The sum of the frictional (TF) and mountain (TM) torques contributes about half of this negative bias in the northern summer and autumn. The torque due to the parameterized gravity wave drag, TG, contributes the other half of the negative bias in summer but contributes the whole of it in winter. In the annual mean the projected angular momentum imbalance due to TG exceeds that due to TM + TF. Consistent with the budget analysis of the assimilated data, losses of angular momentum are also found in an extensive set of medium-range forecasts made with the NCEP reanalysis model. The average rates of loss of relative angular momentum in these forecasts, -7 Hadleys in January and -6 in July, are comparable to the bias of the total torque in the angular momentum budget. Further investigations are suggested to determine the model error, especially that associated with the parameterized gravity wave drag, related to the budget imbalance found in this study.

AB - The balance of global atmospheric angular momentum is examined in a long time series of "reanalysis" data generated at the National Centers for Environmental Prediction (NCEP). A systematic negative bias of about -10 Hadleys (1018 kg m2 s-2) is obtained in the total torque in all seasons. The sum of the frictional (TF) and mountain (TM) torques contributes about half of this negative bias in the northern summer and autumn. The torque due to the parameterized gravity wave drag, TG, contributes the other half of the negative bias in summer but contributes the whole of it in winter. In the annual mean the projected angular momentum imbalance due to TG exceeds that due to TM + TF. Consistent with the budget analysis of the assimilated data, losses of angular momentum are also found in an extensive set of medium-range forecasts made with the NCEP reanalysis model. The average rates of loss of relative angular momentum in these forecasts, -7 Hadleys in January and -6 in July, are comparable to the bias of the total torque in the angular momentum budget. Further investigations are suggested to determine the model error, especially that associated with the parameterized gravity wave drag, related to the budget imbalance found in this study.

UR - http://www.scopus.com/inward/record.url?scp=0033608194&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033608194&partnerID=8YFLogxK

M3 - Article

VL - 104

SP - 2031

EP - 2040

JO - Journal of Geophysical Research: Atmospheres

JF - Journal of Geophysical Research: Atmospheres

SN - 2169-897X

IS - D2

M1 - 1998JD200068

ER -