Evaluation of Atmospheric Evaluation of Atmospheric Temperature Profiling off a Temperature Profiling off a Building Side in the Early Building Side in the Early

Morning HoursMorning HoursRyan BrownRyan Brown

Department of Marine and Environmental SystemsDepartment of Marine and Environmental SystemsFlorida Institute of TechnologyFlorida Institute of Technology

Melbourne, Florida 32901Melbourne, Florida 32901July 20, 2005July 20, 2005

Temperature ProfilingTemperature Profiling

Why are we doing Why are we doing this?this?

How the data was How the data was collectedcollected

ResultsResults ConclusionsConclusions

Why are we Doing This?Why are we Doing This? To locate To locate

the the Nocturnal Nocturnal Boundary Boundary Layer (NBL)Layer (NBL)

To obtain a To obtain a low level low level temperaturtemperature profilee profile

http://lidar.ssec.wisc.edu/papers/akp_thes/node6.htm

What is the NBL?What is the NBL? AMS def.- The cool layer of air adjacent to AMS def.- The cool layer of air adjacent to

the ground that forms at night. the ground that forms at night. Forms from radiative cooling and surface Forms from radiative cooling and surface

friction friction Can extend for a few hundred metersCan extend for a few hundred meters Interacting processes can occur within the Interacting processes can occur within the

stable NBLstable NBL– Patchy sporadic turbulencePatchy sporadic turbulence– Internal gravity wavesInternal gravity waves– Drainage flowsDrainage flows– Inertial oscillationsInertial oscillations– Nocturnal jetsNocturnal jets

What is a What is a Sounding Sounding Profile?Profile?

A temperature A temperature analysis of the analysis of the atmosphere atmosphere above one above one particular spot particular spot on the surfaceon the surface

A measures A measures the the atmospheric atmospheric and dew point and dew point temperaturestemperatures

http://weather.admin.niu.edu/cgi-bin/getmodel

Measuring the TemperatureMeasuring the Temperature

www.fit.edu

2.5 m

5 m

10 m

15 m

20 m

22.5 m

Depth

Height22.5 m

20 m

15 m

10 m

5 m

2.5 m

Measuring the TemperatureMeasuring the Temperature

Measuring the TemperatureMeasuring the Temperature

A temperature probe A temperature probe was lowered from the was lowered from the top of the building to top of the building to the bottomthe bottom

Connected to a laptop Connected to a laptop on the groundon the ground

Two types of runsTwo types of runs– Slow, with 1 minute at Slow, with 1 minute at

each deptheach depth– Fast, from top to Fast, from top to

bottom without bottom without stoppingstopping

Measuring the TemperatureMeasuring the Temperature

June 8June 8– 4 total runs4 total runs

3 slow3 slow 1 fast1 fast

June 9June 9– 8 total runs8 total runs

2 slow2 slow 6 fast6 fast

SimulationsSimulations– Fast RunsFast Runs– What the profile What the profile

should be without lagshould be without lag– Equation based on Equation based on

Newtonian coolingNewtonian cooling– ΔΔT= Lapse Rate * Velocity T= Lapse Rate * Velocity

* Time + Temp* Time + Tempoo

A Glance at Real Time DataA Glance at Real Time Data

TemperaturTemperature fluctuates e fluctuates ±.035 ±.035 degrees per degrees per secondsecond

End of

Run

Beginning of Run

Bottom of

Building

24

24.2

24.4

24.6

24.8

25

25.2

25.4

5:16 5:31 5:45 6:00 6:14 6:28 6:43 6:57 7:12 7:26 7:40

Time

Tem

per

atu

re (

C)

Temperature Graph From the Temperature Graph From the Morning of June 8Morning of June 8

The Fast Run of June 8The Fast Run of June 8

0

5

10

15

20

25

24.78 24.8 24.82 24.84 24.86 24.88 24.9 24.92 24.94 24.96 24.98 25

Temperature (C)

Dep

th (

m)

Down Up

Fast RunFast Run– Occurred Occurred

from from 0715 to 0715 to 07230723

– IncreasinIncreasing Temp. g Temp. the whole the whole timetime

A Look at the Fast Run Without A Look at the Fast Run Without LagLag

24.75

24.8

24.85

24.9

24.95

25

0 50 100 150 200 250 300 350 400 450 500

Time (s)

Tem

per

atu

re (

C)

Simulation Actual

Temperature Graph from the Temperature Graph from the Morning of June 9Morning of June 9

26.3

26.35

26.4

26.45

26.5

26.55

26.6

26.65

26.7

26.75

5:16 5:25 5:34 5:42 5:51 6:00 6:08 6:17 6:25 6:34 6:43 6:51 7:00 7:09 7:17 7:26 7:35

Time

Tem

per

atu

re (

C)

Fast runs for the morning of Fast runs for the morning of June 9June 9

0

5

10

15

20

25

26.30 26.35 26.40 26.45 26.50 26.55 26.60 26.65 26.70 26.75

Temperature (C)

Dep

th (

m)

5:27-5:32 5:36-5:41 5:52-5:58 6:11-6:16 6:22-6:27 7:11-7:17

Taking a Closer Look at Fast Taking a Closer Look at Fast Run 2Run 2

26.3

26.35

26.4

26.45

26.5

26.55

26.6

26.65

26.7

26.75

5:16 5:25 5:34 5:42 5:51 6:00 6:08 6:17 6:25 6:34 6:43 6:51 7:00 7:09 7:17 7:26 7:35

Time

Tem

per

atu

re (

C)

A Look at Run 2 Without LagA Look at Run 2 Without Lag

26.355

26.36

26.365

26.37

26.375

26.38

26.385

26.39

26.395

26.4

26.405

0 50 100 150 200 250 300 350

Time (s)

Tem

per

atu

re (

C)

Simulation Actual

ConclusionsConclusions

Temperature Inversion Temperature Inversion – The Crawford building was underneath The Crawford building was underneath

the NBLthe NBL The Summer months in FL is not the The Summer months in FL is not the

best time to Search for the NBL due best time to Search for the NBL due to little radiative coolingto little radiative cooling– NBL is not shallowNBL is not shallow

AcknowledgementsAcknowledgements

All Field Project ResearchersAll Field Project Researchers Mike SplittMike Splitt

– Pearl Program for SimulationsPearl Program for Simulations

Questions?Questions?

Arlena Moses