Observation of Gravity Waves at the Tropical Tropopause Using Superpressure Balloons
Observation of Gravity Waves at the Tropical Tropopause Using Superpressure Balloons
复制标题
使用超压气球观测热带对流层顶的重力波
DOI：
10.1029/2021jd035165
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
A. Podglajen
中科院分区：
文献类型：
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作者：
Milena Corcos;A. Hertzog;R. Plougonven;A. Podglajen
通过测量 Strateole-2 超压气球飞行期间收集的动量通量来研究热带重力波活动。该数据集由2019年11月至2020年2月在热带深处进行的8次气球飞行组成，每次飞行持续2-3个月，每30秒收集一次现场气象数据。使用来自 NOAA/NCEP GPM_MERGIR 卫星数据产品的地球静止卫星数据（分辨率为 1 小时）研究重力波与深对流之间的关系。重力波动量通量的幅度明显依赖于到最近对流系统的距离，随着到对流系统距离的增加而强烈衰减。最大动量通量值（> 5 mPa）仅在距深对流不到 200 公里处发现。对于高频重力波（周期短于 60 分钟），波通量对距对流距离的敏感性更强。较低频率的波趋于远离对流的非零背景值，支持重力波阻力参数化中的某些背景值。另一方面，在对流附近观察到的大范围动量通量值强调了重力波源的间歇性。还研究了赤道带内重力波间歇性的大尺度变化。结果突出了重力波活动的空间变化，其中陆地上记录的最高动量通量。
Tropical gravity wave activity is investigated using measurements of momentum fluxes gathered during Strateole‐2 superpressure balloon flights. The data set consists of eight balloon flights performed in the deep tropics from November 2019 to February 2020. The flights lasted for 2–3 months each, and in‐situ meteorological data were collected every 30 s. The relation between gravity waves and deep convection is investigated using geostationary satellite data from the NOAA/NCEP GPM_MERGIR satellite data product, at 1 h resolution. The amplitude of gravity wave momentum fluxes shows a clear dependence on the distance to the nearest convective system, with a strong decay as distance to convection increases. The largest momentum‐flux values (> 5 mPa) are only found less than 200 km away from deep convection. The sensitivity of the wave flux to distance from convection is stronger for high frequency gravity waves (periods shorter than 60 min). Lower frequency waves tend to a non‐zero, background value away from convection, supporting some background value in gravity‐wave drag parameterizations. On the other hand, the wide range of momentum flux values observed close to the convection emphasizes the intermittent nature of the gravity‐wave source. The large scale variation of gravity‐wave intermittency within the equatorial belt is also studied. The results highlight spatial variations of gravity wave activity, with the highest momentum flux recorded over land.
影响因子：
4.4
作者：
Ern, M.;Ploeger, F.;Riese, M.
通讯作者：
Riese, M.
DOI：
10.1029/2020jd033969
发表时间：
2020-10
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
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作者：
W. Randel;Fei Wu;A. Podglajen
通讯作者：
W. Randel;Fei Wu;A. Podglajen
从卫星观测到的夏季副热带重力波动量通量谱：对全球建模的启示
影响因子：
5.2
作者：
M. Ern;P. Preusse
通讯作者：
P. Preusse