Ruth S. Lieberman, Gunter Stober, Erich Becker, Diego Janches, Jun Ma, Alan Liu
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Typical amplitudes range from 1 to 5 <span></span><math>\n <semantics>\n <mrow>\n <msup>\n <mi>m</mi>\n <mn>2</mn>\n </msup>\n <msup>\n <mi>s</mi>\n <mrow>\n <mo>−</mo>\n <mn>2</mn>\n </mrow>\n </msup>\n </mrow>\n <annotation> ${\\mathrm{m}}^{2}{\\mathrm{s}}^{-2}$</annotation>\n </semantics></math> and are generally, though not always, out of phase with the horizontal wind consistent with wind-induced dissipation of upward-propagating GWs. The 2-day wave-modulated GW drag ranges between 20 and 140 m <span></span><math>\n <semantics>\n <mrow>\n <msup>\n <mi>s</mi>\n <mrow>\n <mo>−</mo>\n <mn>1</mn>\n </mrow>\n </msup>\n <mspace></mspace>\n <msup>\n <mtext>day</mtext>\n <mrow>\n <mo>−</mo>\n <mn>1</mn>\n </mrow>\n </msup>\n </mrow>\n <annotation> ${\\mathrm{s}}^{-1}\\ {\\text{day}}^{-1}$</annotation>\n </semantics></math> and can amplify, damp, and alter the phase of the 2-day wave. These multiple relationships between the GW drag and the 2-day wave suggest that in situ processes may influence GW drag, including secondary GWs excited from the breakdown of primary GW packets.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 8","pages":""},"PeriodicalIF":3.8000,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD042788","citationCount":"0","resultStr":"{\"title\":\"Two-Day Wave Modulation of Gravity Wave Momentum Fluxes Observed Over South America\",\"authors\":\"Ruth S. 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引用次数: 0
摘要
行星波（PW）调制重力波（GW）耗散早已被认为是中间层和低层热层纵向变率的一个来源。然而，直接测量GW阻力是罕见的。我们确定了由火地岛里约热内卢Grande的南阿根廷敏捷流星雷达（SAAMER）和智利Cerro Pachon的安第斯激光雷达天文台（ALO）的流星雷达测量的GW动量通量的2天波变化。典型的振幅范围从1到5 m 2 s−2 ${\mathrm{m}}^{2}{\mathrm{s}}^{-2}$，通常是，虽然不总是，与水平风的相位不一致，与向上传播的gw的风致耗散一致。2天调波GW阻力范围为20 ~ 140 m s−1天−1${\mathrm{s}}^{-1}\ {\text{day}}^{-1}$和可以放大、阻尼和改变2天波的相位。GW阻力和2天波之间的多重关系表明，原位过程可能影响GW阻力，包括由初级GW包击穿激发的二次GW。
Two-Day Wave Modulation of Gravity Wave Momentum Fluxes Observed Over South America
Planetary wave (PW) modulation of gravity wave (GW) dissipation has long been proposed as a source of longitudinal variability in the mesosphere and lower thermosphere. However, direct measurements of GW drag are rare. We identify 2-day wave variations in GW momentum fluxes measured by the Southern Argentina Agile Meteor Radar (SAAMER) in Rio Grande, Tierra del Fuego, and a meteor radar at the Andes Lidar Observatory (ALO) in Cerro Pachon, Chile. Typical amplitudes range from 1 to 5 and are generally, though not always, out of phase with the horizontal wind consistent with wind-induced dissipation of upward-propagating GWs. The 2-day wave-modulated GW drag ranges between 20 and 140 m and can amplify, damp, and alter the phase of the 2-day wave. These multiple relationships between the GW drag and the 2-day wave suggest that in situ processes may influence GW drag, including secondary GWs excited from the breakdown of primary GW packets.
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JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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