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Quantifying gravity wave momentum fluxes with Mesosphere Temperature Mappers and correlative instrumentation

descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 16 Dec 2014 United Kingdom, United States English Publisher:American Geophysical Union (AGU)Journal:Journal of Geophysical Research: Atmospheres, volume 119 (issn: 2169-897X, eissn: 2169-8996, Copyright policy )
Authors: Fritts, David C.; Pautet, Pierre-Dominique; Bossert, Katrina; Taylor, Michael J.; Williams, Bifford P.; Iimura, Hiroyuki; Yuan, Tao; +2 Authors

doi: 10.1002/2014jd022150

Quantifying gravity wave momentum fluxes with Mesosphere Temperature Mappers and correlative instrumentation

Abstract

AbstractAn Advanced Mesosphere Temperature Mapper and other instruments at the Arctic Lidar Observatory for Middle Atmosphere Research in Norway (69.3°N) and at Logan and Bear Lake Observatory in Utah (42°N) are used to demonstrate a new method for quantifying gravity wave (GW) pseudo‐momentum fluxes accompanying spatially and temporally localized GW packets. The method improves on previous airglow techniques by employing direct characterization of the GW temperature perturbations averaged over the OH airglow layer and correlative wind and temperature measurements to define the intrinsic GW properties with high confidence. These methods are applied to two events, each of which involves superpositions of GWs having various scales and character. In each case, small‐scale GWs were found to achieve transient, but very large, momentum fluxes with magnitudes varying from ~60 to 940 m2 s−2, which are ~1–2 decades larger than mean values. Quantification of the spatial and temporal variations of GW amplitudes and pseudo‐momentum fluxes may also enable assessments of the total pseudo‐momentum accompanying individual GW packets and of the potential for secondary GW generation that arises from GW localization. We expect that the use of this method will yield key insights into the statistical forcing of the mesosphere and lower thermosphere by GWs, the importance of infrequent large‐amplitude events, and their effects on GW spectral evolution with altitude.

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United Kingdom, United States
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Keywords

Atmospheric Science, 551, Oceanography, momentum flux, /dk/atira/pure/subjectarea/asjc/1100/1111; name=Soil Science, /dk/atira/pure/subjectarea/asjc/1100/1107; name=Forestry, /dk/atira/pure/subjectarea/asjc/2300/2303; name=Ecology, /dk/atira/pure/subjectarea/asjc/1900/1906; name=Geochemistry and Petrology, Earth and Planetary Sciences (miscellaneous), /dk/atira/pure/subjectarea/asjc/1900/1911; name=Palaeontology, mesosphere, airglow, Water Science and Technology, /dk/atira/pure/subjectarea/asjc/1900/1908, Ecology, /dk/atira/pure/subjectarea/asjc/1900/1904, Palaeontology, /dk/atira/pure/subjectarea/asjc/1900/1906, Forestry, Geophysics, /dk/atira/pure/subjectarea/asjc/2300/2312; name=Water Science and Technology, /dk/atira/pure/subjectarea/asjc/1900/1912; name=Space and Planetary Science, /dk/atira/pure/subjectarea/asjc/1900/1901, /dk/atira/pure/subjectarea/asjc/1900/1902, /dk/atira/pure/subjectarea/asjc/1900/1910; name=Oceanography, /dk/atira/pure/subjectarea/asjc/1100/1104, /dk/atira/pure/subjectarea/asjc/1100/1107, /dk/atira/pure/subjectarea/asjc/1100/1111, /dk/atira/pure/subjectarea/asjc/1900/1901; name=Earth and Planetary Sciences (miscellaneous), Soil Science, Aquatic Science, Gravity waves, /dk/atira/pure/subjectarea/asjc/1100/1104; name=Aquatic Science, Atmospheric Sciences, Geochemistry and Petrology, Mesosphere Temperature Mapper, /dk/atira/pure/subjectarea/asjc/1900/1912, /dk/atira/pure/subjectarea/asjc/1900/1911, /dk/atira/pure/subjectarea/asjc/2300/2303, /dk/atira/pure/subjectarea/asjc/1900/1910, Earth-Surface Processes, /dk/atira/pure/subjectarea/asjc/1900/1908; name=Geophysics, /dk/atira/pure/subjectarea/asjc/1900/1902; name=Atmospheric Science, /dk/atira/pure/subjectarea/asjc/1900/1904; name=Earth-Surface Processes, Space and Planetary Science, /dk/atira/pure/subjectarea/asjc/2300/2312

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    popularity
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    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
38
Top 10%
Top 10%
Top 10%
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