On concentration footprints for a tall tower in the presence of a nocturnal low-level jet

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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On concentration footprints for a tall tower in the presence of a nocturnal low-level jet. / Sogachev, Andrey; Leclerc, M.Y.

In: Agricultural and Forest Meteorology, Vol. 151, No. 6, 2011, p. 755-764.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Author

Sogachev, Andrey; Leclerc, M.Y. / On concentration footprints for a tall tower in the presence of a nocturnal low-level jet.

In: Agricultural and Forest Meteorology, Vol. 151, No. 6, 2011, p. 755-764.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

Bibtex

@article{3db6f48cda6c446293bdc3fa04eda83a,
title = "On concentration footprints for a tall tower in the presence of a nocturnal low-level jet",
keywords = "Wind power meteorology, Wind Energy, Vindkraftmeteorologi, Vindenergi",
publisher = "Elsevier BV",
author = "Andrey Sogachev and M.Y. Leclerc",
year = "2011",
doi = "10.1016/j.agrformet.2010.10.004",
volume = "151",
number = "6",
pages = "755--764",
journal = "Agricultural and Forest Meteorology",
issn = "0168-1923",

}

RIS

TY - JOUR

T1 - On concentration footprints for a tall tower in the presence of a nocturnal low-level jet

A1 - Sogachev,Andrey

A1 - Leclerc,M.Y.

AU - Sogachev,Andrey

AU - Leclerc,M.Y.

PB - Elsevier BV

PY - 2011

Y1 - 2011

N2 - This paper reports on the location of sources contributing to a point concentration measurement in the stable boundary layer. Concentration footprints for sensors located at different heights during the night are examined using a backward-in-time Lagrangian stochastic dispersion model. Simulations of air parcel transport in a non-steady-state atmospheric boundary layer above a bare surface and a forest under different insolation suggest that sources located as far as several hundred kms away contribute to a concentration measurement made at levels as high as 500 m. The origin of the maximal contribution area shifts during the night depending on the wind direction at the sensor location, a feature most prominent in the presence of decoupling between sensor levels and surface sources. Simulations suggest that atmospheric static stability alone is not a sufficient criterion to trigger flow decoupling. The presence of the low-level jet provides vertical mixing of air parcels even for stable boundary layers with Richardson numbers higher than the critical. This finding is in agreement with earlier observations suggesting that the level of the low-level jet nose acts as a strong lid prohibiting vertical gas propagation. These findings have important implications in the interpretation of eddy-flux measurements in nocturnal conditions.

AB - This paper reports on the location of sources contributing to a point concentration measurement in the stable boundary layer. Concentration footprints for sensors located at different heights during the night are examined using a backward-in-time Lagrangian stochastic dispersion model. Simulations of air parcel transport in a non-steady-state atmospheric boundary layer above a bare surface and a forest under different insolation suggest that sources located as far as several hundred kms away contribute to a concentration measurement made at levels as high as 500 m. The origin of the maximal contribution area shifts during the night depending on the wind direction at the sensor location, a feature most prominent in the presence of decoupling between sensor levels and surface sources. Simulations suggest that atmospheric static stability alone is not a sufficient criterion to trigger flow decoupling. The presence of the low-level jet provides vertical mixing of air parcels even for stable boundary layers with Richardson numbers higher than the critical. This finding is in agreement with earlier observations suggesting that the level of the low-level jet nose acts as a strong lid prohibiting vertical gas propagation. These findings have important implications in the interpretation of eddy-flux measurements in nocturnal conditions.

KW - Wind power meteorology

KW - Wind Energy

KW - Vindkraftmeteorologi

KW - Vindenergi

U2 - 10.1016/j.agrformet.2010.10.004

DO - 10.1016/j.agrformet.2010.10.004

JO - Agricultural and Forest Meteorology

JF - Agricultural and Forest Meteorology

SN - 0168-1923

IS - 6

VL - 151

SP - 755

EP - 764

ER -