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DOI | 10.1175/JAS-D-17-0010.1 |
Small-Scale Wind Fluctuations in the Tropical Tropopause Layer from Aircraft Measurements: Occurrence, Nature, and Impact on Vertical Mixing | |
Podglajen, Aurelien1; Bui, T. Paul2; Dean-Day, Jonathan M.2; Pfister, Leonhard2; Jensen, Eric J.2; Alexander, M. Joan3; Hertzog, Albert4; Kaercher, Bernd5; Plougonven, Riwal6; Randel, William J.7 | |
2017-11-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | France; USA; Germany |
英文摘要 | The contribution of turbulent mixing to heat and tracer transport in the tropical tropopause layer (TTL) is poorly constrained, partly owing to a lack of direct observations. Here, the authors use high-resolution (20 Hz) airborne measurements to study the occurrence and properties of small-scale (<100 m) wind fluctuations in the TTL (14-19 km) over the tropical Pacific. The fluctuations are highly intermittent and appear localized within shallow (100 m) patches. Furthermore, active turbulent events are more frequent at low altitude, near deep convection, and within layers of low gradient Richardson number. A case study emphasizes the link between the turbulent events and the occurrence of inertio-gravity waves having small horizontal or vertical scale. To evaluate the impact of the observed fluctuations on tracer mixing, their characteristics are examined. During active events, they are in broad agreement with inertial-range turbulence theory: the motions are close to 3D isotropic and the spectra follow a -5/3 power-law scaling. The diffusivity induced by turbulent bursts is estimated to be on the order of 10(-1) m(2) s(-1) and increases from the top to the bottom of the TTL (from; similar to 2 x 10(-2) to; similar to 3 x 10(-1) m(2) s(-1)). Given the uncertainties involved in the estimate, this is in reasonable agreement (about a factor of 3-4 lower) with the parameterized turbulent diffusivity in ERA-Interim, but it disagrees with other observational estimates from radar and radiosondes. The magnitude of the consequent vertical transport depends on the altitude and the tracer; for the species considered, it is generally smaller than that induced by the mean tropical upwelling. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417994800019 |
WOS关键词 | LOWER STRATOSPHERE ; GRAVITY-WAVES ; SEASONAL VARIABILITY ; TAPE-RECORDER ; TURBULENCE ; TROPOSPHERE ; TEMPERATURE ; DIFFUSIVITY ; TRANSPORT ; SPECTRA |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29274 |
专题 | 地球科学 |
作者单位 | 1.Univ Paris 06, Ecole Polytech, Ecole Normale Super,Lab Meteorol Dynam,CNRS, Inst Pierre Simon Laplace,UMR 8539, Paris, France; 2.NASA, Ames Res Ctr, Moffett Field, CA 94035 USA; 3.North West Res Associates, CoRA Off, Boulder, CO USA; 4.UPMC Univ Paris 06, IPSL, Lab Meteorol Dynam, CNRS, Palaiseau, France; 5.Deutsch Zentrum Luft & Raumfahrt, Inst Phys Atmosphare, Wessling, Germany; 6.Paris Saclay Univ, Ecole Polytech, IPSL, Lab Meteorol Dynam, Palaiseau, France; 7.Natl Ctr Atmospher Res, Boulder, CO USA |
推荐引用方式 GB/T 7714 | Podglajen, Aurelien,Bui, T. Paul,Dean-Day, Jonathan M.,et al. Small-Scale Wind Fluctuations in the Tropical Tropopause Layer from Aircraft Measurements: Occurrence, Nature, and Impact on Vertical Mixing[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(11). |
APA | Podglajen, Aurelien.,Bui, T. Paul.,Dean-Day, Jonathan M..,Pfister, Leonhard.,Jensen, Eric J..,...&Randel, William J..(2017).Small-Scale Wind Fluctuations in the Tropical Tropopause Layer from Aircraft Measurements: Occurrence, Nature, and Impact on Vertical Mixing.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(11). |
MLA | Podglajen, Aurelien,et al."Small-Scale Wind Fluctuations in the Tropical Tropopause Layer from Aircraft Measurements: Occurrence, Nature, and Impact on Vertical Mixing".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.11(2017). |
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