Water Transport in Jet Stream Winds

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Water Transport in Jet Stream Winds

• Surface Water Hydrology Term Project
• Cédric DAVID

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Overview

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

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

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

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

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

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2. Data and Programming
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2. Data and Programming

• IDV SoftwareJava-based software framework for
  analyzing and visualizing geoscience data

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2. Data and Programming

• National Oceanic and Atmospheric Administration 
• National Center for Environmental Prediction
• National Weather Service
• ?North American
• Regional Reanalysis

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2. Data and Programming

• NARR A Monthly
• Pressure
• Temperature
• Specific Humidity
• Wind Speed
• Dew Point Temperature

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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)

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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)

wssqrt(u2v2)
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2. Data and Programming
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2. Data and Programming
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3. Results
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3. Results
Jet Streak Cross section with filtered Jet
Stream
Whole NARR Domain Long Computation time
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3. Results
July
29 m/s isovolume Just above the Great Lakes
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3. Results
July
12000m
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3. Results
July
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3. Results
December
29 m/s isovolume Just above Florida
GOES SOUTH!
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3. Results
December
12000m
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3. Results
December
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3. Results

• Jython formulas
• Select Jet Stream
• Specific Humidity Flow in Jet Stream

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3. Results

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

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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

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Questions?

• http//www.physicalgeography.net/fundamentals/7q.h
  tml
• http//ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cyc/u
  pa/jet.rxml