retrieval of atmospheric boundary layer height by csir-nlc mobile lidar, pretoria (25.5°s;...

RETRIEVAL OF ATMOSPHERIC BOUNDARY LAYER

HEIGHT BY CSIR-NLC MOBILE LIDAR, PRETORIA

(25.5°S; 28.2°E), SOUTH AFRICA

Prof. Venkataraman Sivakumar CSIR - National Laser Centre svenkataraman@csir.co.za svsk74@gmail.com

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Slide 3 © CSIR 2008 www.csir.co.za

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System 3-D View

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System Block Diagram

Slide 6 © CSIR 2008 www.csir.co.za

It’s safe, person can walk

around even when the laser is

in operational.

Slide 7 © CSIR 2008 www.csir.co.za

Initial Tests

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Signal to Noise

0

5

10

15

20

25

30

35

40

1.E+02 1.E+04 1.E+06 1.E+08 1.E+10

Photons per second

He

igh

t [k

m]

Slide 9 © CSIR 2008 www.csir.co.za

0-16

km

Up

to 5

0 k

m

26 – 29 km

2-3 km

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Preliminary Results23 Feb 2008

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Height profile of range corrected LIDAR signal returns and the illustration of detection of Boundary Layer by slope method.

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Height-Time-Color map of LIDAR signal returns (arb.unit) for 10 August 2010. The figure is overlapped by the determined boundary layer height (Black: statistical based on range corrected signal, Pink: slope method)

Temporal evolution of difference in detected boundary layer height.

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First “Lidar Field Campaign”

First 23-hour continuous measurement at University of Pretoria

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Height-Time(diurnal)-Color map of LIDAR signal returns (arb.unit) for 16-17 October 2008. The figure is overlapped by the determined boundary layer height (Black: statistical based on range corrected signal, Pink: slope method)

Temporal evolution of difference in detected boundary layer height.

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LIDAR measurements at Elandsfontein

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01-02 December 2010

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SANOX – Campaign Expt. 23-27 May 2011

23-24 May 2011

24 May 2011 27 May 2011

Slide 20 © CSIR 2008 www.csir.co.za

Our future scientists

Slide 21 © CSIR 2008 www.csir.co.za

Where does it go ?

How does it impact ?

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Schematic view of the planned LIDAR system with Scanner

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Initial result from 2-Channel (532 nm and 355 nm)

0

5

10

15

20

25

30

35

40

1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08 1.E+09 1.E+10

He

igh

t [k

m]

Photons per second

355 nm532 nm

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