Equatorial waves, diurnal tides and small-scale thermal variability in the tropical lower stratosphere from COSMIC-2 radio occultation

Randel, William J.; Wu, Fei

doi:10.1002/essoar.10504432.1

Cited by 1 publication

(2 citation statements)

References 41 publications

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“…Both maps highlight a clear contrast between quieter regions (Eastern Pacific Ocean, Eastern Atlantic Ocean) and more active regions (South America, Eastern Africa, and the Maritime Continent), in agreement with maps from Randel et al. (2021). The amplitude of geographic variability is different than that of Randel et al.…”

Section: Discussionsupporting

confidence: 89%

“…The amplitude of geographic variability is different than that of Randel et al. (2021), but this difference is certainly associated with their use of temperature disturbances to study gravity waves, while we have chosen momentum fluxes. Ern and Preusse (2012) also reported on

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% enhancements in gravity‐wave momentum fluxes over convective regions as compared to non‐convective ones.…”

Section: Discussionmentioning

confidence: 99%

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Observation of Gravity Waves at the Tropical Tropopause Using Superpressure Balloons

et al. 2021

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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 (>5mPa) 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.

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Section: Discussionsupporting

confidence: 89%

20 - 30

% enhancements in gravity‐wave momentum fluxes over convective regions as compared to non‐convective ones.…”

Section: Discussionmentioning

confidence: 99%

Observation of Gravity Waves at the Tropical Tropopause Using Superpressure Balloons

et al. 2021

View full text Add to dashboard Cite

show abstract

Equatorial waves, diurnal tides and small-scale thermal variability in the tropical lower stratosphere from COSMIC-2 radio occultation

Cited by 1 publication

References 41 publications

Observation of Gravity Waves at the Tropical Tropopause Using Superpressure Balloons

Observation of Gravity Waves at the Tropical Tropopause Using Superpressure Balloons

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