Observation of stable marine boundary layer by shipborne Coherent Doppler Lidar and radiosonde over Yellow Sea

ZHAI Xiaochun; WU Songhua; LIU Bingyi; YIN Jiaping; ZHANG Hongwei

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Observation of stable marine boundary layer by shipborne Coherent Doppler Lidar and radiosonde over Yellow Sea
Vol. 24, Issue S1, Pages: 76-88(2020)
Published：07 June 2020
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DOI：

Zhai X C,Wu S H,Liu B Y,Yin J P and Zhang H W. 2020. Observation of stable marine boundary layer by shipborne Coherent Doppler Lidar and radiosonde over Yellow Sea. Journal of Remote Sensing(Chinese). 24(S1): 76-88 DOI：

摘要

Abstract

Shipborne observations obtained with the Coherent Doppler lidar (CDL) and radiosonde during 2014 campaign were used to study the structure of marine boundary layer in Yellow Sea. Vertical wind profiles corrected for ship motion was used to derive higher-order statistics

showing that motion correction is required and significant for turbulence analysis. During a day with weak mesoscale activity

a complexed three-layer structure system was observed. The lowest layer showed a typical stable boundary layer structure feature. An aerosol layer with abrupt variation in wind speed and relative humidity always appeared at the middle layer

the formation of which may be due to Kelvin-Helmholz instability. The top layer encountered a dramatic change in wind direction

which may result from the warm advection from the Eurasian continent on the basis of backward trajectory analysis. Furthermore

the MABL height in stable regime was derived from potential temperature

CDL Signal-to-Noise Ratio (SNR) and CDL vertical velocity variance

respectively. The Stable Boundary Layer (SBL) height in SBL can be derived from the inversion layer of potential temperature profile

and the mixing height in SBL can be retrieved from the vertical velocity variance gradient method. Neither the SBL height nor the mixing height is in agreement with the height retrieved from CDL SNR gradient method because of different definition and criterion. One of the limitations of SNR gradient method for MABL retrieval is that it is easier to be affected by the lofted decoupled aerosol layer

where the retrieved result is less suitable. Finally

the higher-order vertical velocity statistics within the marine stable boundary layer were investigated and compared with the previous studies

and different turbulence mechanisms have an important effect on the statistics deviation.

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Keywords

references

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