Mesoscale Observing Network Course The Sea Breeze Project Reijo Hyvönen, FMI Christer Helenelund,...

Mesoscale Observing Network Course

The Sea Breeze Project

Reijo Hyvönen, FMI

Christer Helenelund, Vaisala

©Vaisala | CH | December 2006 |

Suggested project title

Characteristics of sea breeze at the Finnish South Coast


Introduction

Purpose/goal• To clarify the sea breeze conditions on the Finnish South Coast using HTB

data

What is done/methodology• Pick suitable dates to study (May 6, May 10, July 6 and July 8, 2006)• Collect, summarize and analyze wind data from masts and wind profiler for

these days for two cross sections along the coast• Draw conclusions from the data obtained


Measurement campaigns of HTB phase 1

May 2005 testing

August 2005 (no database, limited instrumentation)• convection, nowcasting by extrapolation• World Championships in Athletics

November 2005 • snow/rain

January-February 2006 • inversions

May 2006• sea breeze• fog

August 2006• convection


Measurement lines


Idealized sea breeze circulation


Measurement station in conjunction with cellular base station

Weather transmitter

h = 40...100 m

Weather transmitter

h = 2 mCell phone data

transfer module and power supply

Station specificURL address

for Internet access


Malmi Wind Profiler (Vaisala LAP-3000)

Photo from Malmi airport


SYNOP 2006-05-06


Wind Profiler measurements 2006-05-06


Wind Profiler measurements 2006-07-28


Wind measurements 2006-05-06 03:30UTC


Sea breeze front 2006-07-28

Reflections frominsects & birds (swallows, swifts)


Initial comments

• Limited HTB data available -> Too small statistical basis for finding common patterns

• Many days with unclear sea breeze effect• The general weather pattern (the geostrophic wind and scattered cloudiness)

makes very often the sea breeze weaker or even or non-existent

• The scattered archipelago makes the coast line diffuse and also the sea breeze unclear• The scattered topography impacts also the local wind (tunneling effect)

• The albedo on the shore varies quite much along the coast

• On top of all this, there is obviously the normal stochastical variation in the wind

• Based on this it might be difficult to make any solid conclusions

Mesoscale Observing Network Course The Sea Breeze Project Reijo Hyvönen, FMI Christer Helenelund,...

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