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Water Transport in Jet Stream Winds

Water Transport in Jet Stream Winds. Surface Water Hydrology Term Project Cédric DAVID. Overview. 1. Introduction 2. Data and Programming 3. Results 4. Conclusions. 1. Introduction. 1. Introduction. Upper level of the atmosphere. Wind. View from the North Pole. Jet Stream.

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Water Transport in Jet Stream Winds

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  1. Water Transport in Jet Stream Winds Surface Water Hydrology Term Project Cédric DAVID

  2. Overview • 1. Introduction • 2. Data and Programming • 3. Results • 4. Conclusions

  3. 1. Introduction

  4. 1. Introduction Upper level of the atmosphere Wind View from the North Pole Jet Stream

  5. 1. Introduction What happens? • Upper air winds regulate air masses • Their deflection by the Coriolis acceleration creates Jet Streams

  6. 1. Introduction Wind

  7. 1. Introduction Altitude: 10000m Wind Altitude: 13000m

  8. 1. Introduction Jet Stream • Its position denotes strongest SURFACE temperature contrast • 100 – 300 km/h28 – 80 m/s • Weaker in the summer (smaller T gradient) In the US

  9. 1. Introduction Jet Streak • 300 km/h • Jet streaks are localized regions of very fast winds embedded within the jet stream.

  10. 2. Data and Programming

  11. 2. Data and Programming IDV SoftwareJava-based software framework for analyzing and visualizing geoscience data

  12. 2. Data and Programming • National Oceanic and Atmospheric Administration  • National Center for Environmental Prediction • National Weather Service North American Regional Reanalysis

  13. 2. Data and Programming NARR A Monthly • Pressure • Temperature • Specific Humidity • Wind Speed • Dew Point Temperature

  14. 2. Data and Programming • NARR.xml ( Too Long) • NARR Homepage (Download .grb grid files) • FTP server • Choose the desired options (levels, parameters and sub regions) • Open them with (degrib, Climate Data Operator, finally IDV)

  15. 2. Data and Programming Formulas in IDV Jython programming language Java version of Python  can work with VisAD objects directly (no loop on the grid necessary) ws=sqrt(u2+v2)

  16. 2. Data and Programming

  17. 2. Data and Programming

  18. 3. Results

  19. 3. Results Jet Streak Cross section with filtered Jet Stream Whole NARR Domain Long Computation time

  20. July 3. Results 29 m/s isovolume Just above the Great Lakes

  21. July 3. Results 12000m

  22. July 3. Results

  23. December 3. Results 29 m/s isovolume Just above Florida GOES SOUTH!

  24. December 3. Results 12000m

  25. December 3. Results

  26. 3. Results Jython formulas • Select Jet Stream • Specific Humidity Flow in Jet Stream

  27. 3. Results Jython formulas • Total Pressure p(not in the NARR) • Density of vapor rv • Mass of water

  28. 4. Conclusions • Limitation of Jython: • only basic mathematical computation • cannot access single cell (easily) • IDV • Good graphic interface • Calculations and formulas • Power of IDV and NARR • Visual aspect of the results • Able to show known phenomena

  29. Questions? • http://www.physicalgeography.net/fundamentals/7q.html • http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cyc/upa/jet.rxml

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