forecasting the transport of pollution using a nwp model
DESCRIPTION
Forecasting the transport of pollution using a NWP model. ETEX Surface Measurement Sites . Aims. To determine the meteorological processes responsible for transporting tracer during ETEX 2 - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/1.jpg)
The University of Reading Helen Dacre UM user 2009
Forecasting the transport of pollution using a NWP model
ETEX Surface Measurement Sites
![Page 2: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/2.jpg)
The University of Reading Helen Dacre UM user 2009
• To determine the meteorological processes responsible for transporting tracer during ETEX 2
• To assess the performance of the UK Met Office’s NWP model in predicting tracer concentrations during ETEX 2
Aims
![Page 3: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/3.jpg)
The University of Reading Helen Dacre UM user 2009
Talk Outline
• Overview of NWP model• Analysis of meteorological processes• Tracer transport in the UM
– Horizontal– Vertical
• Conclusions
![Page 4: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/4.jpg)
The University of Reading Helen Dacre UM user 2009
UK Met Office Unified Model• Eulerian, non-hydrostatic NWP model• Includes parameterisations (boundary layer mixing,
microphysics, convection)• Limited area model 12 km resolution
• Tracer released into lowest model grid box
• Tracers are passive
LAM domain
![Page 5: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/5.jpg)
The University of Reading Helen Dacre UM user 2009
Synoptic AnalysisModis visible
08UTC 14/11/94 Frontal analysis at 00 UTC on
13th, 14th, 15th and 16/11/94
![Page 6: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/6.jpg)
The University of Reading Helen Dacre UM user 2009
Precipitation Fields
Convective rain amount15/10/94 03 UTC
Large-scale rain amount15/10/94 03 UTC
![Page 7: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/7.jpg)
The University of Reading Helen Dacre UM user 2009
Isentropic Surface Analysis
![Page 8: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/8.jpg)
The University of Reading Helen Dacre UM user 2009
Horizontal Tracer Transport
15/11/94 03 UTC 16/11/94 03 UTC15/11/94 15 UTC
![Page 9: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/9.jpg)
The University of Reading Helen Dacre UM user 2009
Vertical Tracer Transport15/11/94 03 UTC 16/11/94 03 UTC15/11/94 15 UTC
285K286K287K
288K
15/11/94 03 UTC 15/11/94 15 UTC
285K286K287K288K
16/11/94 03 UTC
285K
288K287K286K
15/11/94 15 UTC
15/11/94 15 UTCUM - no convectionUM
![Page 10: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/10.jpg)
The University of Reading Helen Dacre UM user 2009
Conclusions• A warm conveyor belt transported tracer up to height of 4km
and tracer was transported further to 8km by convection
• High resolution simulations needed to predict the change in wind direction and hence the observed tracer distribution
• The representation of sub-grid scale processes in NWP models can affect the distribution of tracer
• Accuracy of forecast is also sensitive to choice of model dynamics and accuracy of the meteorological forecast
![Page 11: Forecasting the transport of pollution using a NWP model](https://reader035.vdocument.in/reader035/viewer/2022070423/5681678b550346895ddca780/html5/thumbnails/11.jpg)
The University of Reading Helen Dacre UM user 2009
Wind Direction at Release Site
cold frontWin
d di
rect
ion
(deg
rees
)360
315
270
225
180
15 18 21 00 03 06 09 12 15 14/11/94 Time (UTC) 15/11/94
50km
12km
Obs