Effects of Low‐Level Jets on Near‐Surface Turbulence and Wind Direction Changes in the Nocturnal Boundary Layer

Yang, Bai; Finn, Dennis; Rich, Jason; Gao, Zhongming; Liu, Heping

doi:10.1029/2022jd037657

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Effects of Low‐Level Jets on Near‐Surface Turbulence and Wind Direction Changes in the Nocturnal Boundary Layer

2023
By Yang, Bai ; Finn, Dennis ; Rich, Jason ; ...
Source: Journal of Geophysical Research: Atmospheres, 128(11)

[PDF-1.99 MB]

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Details:

Journal Title:

Journal of Geophysical Research: Atmospheres
Personal Author:

Yang, Bai ; Finn, Dennis ; Rich, Jason ; Gao, Zhongming ; Liu, Heping

Yang, Bai ; Finn, Dennis ; Rich, Jason ; Gao, Zhongming ; Liu, Heping Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ARL (Air Resources Laboratory)

OAR (Oceanic and Atmospheric Research) ; ARL (Air Resources Laboratory) Less -
Description:

In this study we examined a data set of nearly two-year collection and investigated the effects of low-level jets (LLJ) on near-surface turbulence, especially wind direction changes, in the nocturnal boundary layer. Typically, nocturnal boundary layer is thermally stratified and stable. When wind profiles exhibit low gradient (in the absence of LLJ), it is characterized by very weak turbulence and very large, abrupt, but intermittent wind direction changes (∆WD) in the layers near the surface. In contrast, presence of LLJs can cause dramatic changes through inducing wind velocity shears, enhancing vertical mixing, and weakening the thermal stratification underneath. Ultimately, bulk Richardson number (Rb) is reduced and weakly stable
Keywords:

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Atmospheric Science Earth And Planetary Sciences (miscellaneous) Geophysics Space And Planetary Science
Source:

Journal of Geophysical Research: Atmospheres, 128(11)
DOI:

https://doi.org/10.1029/2022jd037657
ISSN:

2169-897X;2169-8996;
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Rights Information:

Other
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Library
Main Document Checksum:

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urn:sha256:4fcdeb8d3662670ba534d85da7d76ac7e4f336f90e047bdda7619716bb274aa5
Download URL:

https://repository.library.noaa.gov/view/noaa/55126/noaa_55126_DS1.pdf
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