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Studies of atmospheric angular momentum

 

Authors:  NOAA, Climate Diagnostics Center, Science Review

 

Published:   25th/26th July, 2001 

 

Chapter 4:  Empirical and Process Studies

 

Introduction to chapter 4, part 3:

Atmospheric angular momentum (AAM) provides a convenient framework to study the role of mountains, surface wind stresses and various transport mechanisms in variability ranging from intraseasonal to interdecadal and beyond. Quantitative studies are feasible with current global assimilated datasets which show a good budget balance for global integrals, intraseasonal variations and during northern winter/spring. The budgets get much worse when gravity wave drag is included, if zonal integrals are considered or during summer/fall seasons. AAM is useful as an index of the large scale zonal flow since it is highly correlated with independent length-of-day measurements and with phenomena such as the QBO, ENSO, the MJO and possibly global warming. CDC scientists have examined several aspects of AAM variability, including: the link to MJO tropical convection, a linear model of global AAM and its torques, the global AAM budget imbalances due to gravity wave drag, the forcing for the semiannual seasonal component of AAM and the AAM response to global warming in an ensemble of coupled ocean-atmosphere model runs. CDC also monitors in real time the complete vertically integrated budget as part of its web-based maproom activities and distributes AAM and torque data to other researchers.

 

Link to full paper:      https://www.esrl.noaa.gov/psd/psd1/review/Chap04/sec3_body.html

 

Link to Introduction to Chapter 4:   https://www.esrl.noaa.gov/psd/psd1/review/Chap04/index.html

 

Link to full Science Review:  https://www.esrl.noaa.gov/psd/psd1/review/SciRev.pdf

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