Low level jet intensification by mineral dust aerosols
Modification of the intensity of a low level jet (LLJ) and near-surface wind speed by mineral dust is important as it has implications for dust emission and its long-range transport. Using the Weather Research and Forecasting with Chemistry (WRF/Chem) regional model, it is shown that direct radia...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2013-04-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/31/625/2013/angeo-31-625-2013.pdf |
| Summary: | Modification of the intensity of a low level jet (LLJ) and near-surface wind
speed by mineral dust is important as it has implications for dust emission
and its long-range transport. Using the Weather Research and Forecasting with
Chemistry (WRF/Chem) regional model, it is shown that direct radiative
forcing by mineral dust reduces temperature in the lower atmosphere, but
increases it in the layers aloft. The surface cooling is shown to be
associated with a reduction of turbulent kinetic energy (TKE) and hence vertical mixing
of horizontal momentum. Changes in the vertical profile of temperature over
the regions that are under the influence of a LLJ are shown to result in an
intensification of the LLJ and near-surface wind speed, but a decrease of
winds aloft. These changes in the wind speed profile differ from results of
previous research which suggested a decrease of wind speed in the lower
atmosphere and its increase in the upper boundary layer. |
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| ISSN: | 0992-7689 1432-0576 |