globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2017JD026471
论文题名:
Gravity wave spectra in the lower stratosphere diagnosed from project loon balloon trajectories
作者: Schoeberl M.R.; Jensen E.; Podglajen A.; Coy L.; Lodha C.; Candido S.; Carver R.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期:16
起始页码: 8517
结束页码: 8524
语种: 英语
英文关键词: gravity waves ; lower stratosphere
英文摘要: Project Loon has been launching superpressure balloons since January 2013 to provide worldwide Internet coverage. These balloons typically fly between 18 and 21 km and provide measurements of winds and pressure fluctuations in the lower stratosphere. We divide 1560 Loon flights into 3405 two-day segments for gravity wave analysis. We derive the kinetic energy spectrum from the horizontal balloon motion and estimate the temperature perturbation spectrum (proportional to the potential energy spectrum) from the pressure variations. We fit the temperature (and kinetic energy) data to the functional form T′2 = T′o 2[ω/ωο)α, where ω is the wave frequency, ωο is daily frequency, T′o is the base temperature amplitude, and α is the spectral slope. Both the kinetic energy and temperature spectra show −1.9 ± 0.2 power-law dependence in the intrinsic frequency window 3–50 cycles/day. The temperature spectrum slope is weakly anticorrelated with the base temperature amplitude. We also find that the wave base temperature distribution is highly skewed. The tropical modal temperature is 0.77 K. The highest amplitude waves occur over the mountainous regions, the tropics, and the high southern latitudes. Temperature amplitudes show little height variation over our 18–21 km domain. Our results are consistent with other limited superpressure balloon analyses. The modal temperature is higher than the temperature currently used in high-frequency gravity wave parameterizations. ©2017. American Geophysical Union. All Rights Reserved.
资助项目: NNX13AK25G
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62594
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Science and Technology Corporation, Columbia, MD, United States; NASA Ames Research Center, Moffett Field, CA, United States; Laboratoire de Météorologie Dynamique, CNRS-UMR8539, Institut Pierre Simon Laplace, École Normale Supérieure, École Polytechnique, Université Pierre et Marie Curie, Paris, France; Laboratoire de Météorologie Dynamique/IPSL, UPMC Univ Paris 06, CNRS, Palaiseau, France; NASA Goddard Space Flight Center, Greenbelt, MD, United States; SSAI, Lanham, MD, United States; Project Loon, X, Mountain View, CA, United States

Recommended Citation:
Schoeberl M.R.,Jensen E.,Podglajen A.,et al. Gravity wave spectra in the lower stratosphere diagnosed from project loon balloon trajectories[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(16)
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