Aircraft Observations of Turbulence Characteristics in the Tropical Cyclone Boundary Layer

Zhao, Zhongkuo; Chan, P. W.; Wu, Naigeng; Zhang, Jun A.; Hon, K. K.

doi:10.1007/s10546-019-00487-8

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Aircraft Observations of Turbulence Characteristics in the Tropical Cyclone Boundary Layer

2019
By Zhao, Zhongkuo ; Chan, P. W. ; Wu, Naigeng ; ...
Source: Boundary-Layer Meteorology, 174(3), 493-511

[PDF-2.50 MB]

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Details:

Journal Title:

Boundary-Layer Meteorology
Personal Author:

Zhao, Zhongkuo ; Chan, P. W. ; Wu, Naigeng ; Zhang, Jun A. ; Hon, K. K.

Zhao, Zhongkuo ; Chan, P. W. ; Wu, Naigeng ; Zhang, Jun A. ; Hon, K. K. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) ; NWS (National Weather Service)

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) ; NWS (National Weather Service) Less -
Description:

The Hong Kong Observatory conducted six flights in the atmospheric boundary layer of five tropical cyclones: tropical storm Jebi (1309), typhoon Kalmaegi (1415), severe tropical storm Linfa (1510), typhoon Mujigae (1522), and severe typhoon Nida (1604). Three-dimensional wind data with a 20-Hz sampling rate are available for a height range of 500–670 m, with the mean wind speed from these low-level flights ranging from 10 to 62 m s−1. The turbulent momentum flux and turbulence kinetic energy (e) are measured using the eddy-correlation method, while horizontal scales of turbulent eddies, vertical eddy diffusivity (K), and the vertical turbulent mixing length scale are estimated indirectly. The dependence of the momentum flux, e, K, and the vertical mixing length on wind speed and height are compared with previous studies. Both the momentum flux and turbulent kinetic energy increase with the wind speed, although the rate of increase is smaller for higher wind speeds. It is also found that K increases with wind speed according to a power law up to 40 m s−1 before levelling off, while the vertical mixing length is nearly constant at 100 m. The results serve as a reference for evaluating and improving the turbulent parametrizion in tropical-cyclone models, while the observed large turbulent mixing near the top of the inflow layer of the eyewall region should not be neglected in numerical models.
Source:

Boundary-Layer Meteorology, 174(3), 493-511
DOI:

https://doi.org/10.1007/s10546-019-00487-8
ISSN:

0006-8314;1573-1472;
Format:

PDF
Publisher:

Springer Science and Business Media LLC
Document Type:

Journal Article
Funding:

Grant no. NA14NWS4680028
Rights Information:

Accepted Manuscript
Compliance:

Submitted
Main Document Checksum:

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urn:sha-512:f3515da5cd1fed046125160ee108c7618b0c5066e6825b2ac996f9f2d9555608c295f536ff3c6d41b66948cf609a4064b0bd4a333d8f7619a487b91286fa5ce1
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https://repository.library.noaa.gov/view/noaa/65726/noaa_65726_DS1.pdf
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Aircraft Observations of Turbulence Characteristics in the Tropical Cyclone Boundary Layer

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