Measured parameters: particle backscatter at 355 and 532 nm, particle extinction at 355 nm, lidar...

Measured parameters:

• particle backscatter at 355 and 532 nm, • particle extinction at 355 nm, • lidar ratio at 355 nm, • particle depolarization at 355 nm, • atmospheric temperature• water vapour mixing ratio. • relative humidity measurements obtained

from simultaneous lidar measurements of water vapour and temperature.

Location: Potenza, 40°38'45.23" N 15°48'29.32" E, 730 m asl

BASIL - DIFA-Univ. of BASILicata Raman Lidar

3rd COPS & GOP Workshop, 10/11 April

SEA-TAINER WITH SIZE THAT ALSO ALLOW EASY TRANSPORTATION ON ROAD

DETECTORS: photomultipliersPhotocathode = BialkaliQuantum efficiency @ 355 nm= 20 %Gain = 2x106

ACQUISITION: photon counting modeMinimum dwell time 100 nsBandwidth 125 MHz

RECEIVING SYSTEM: Newtonian telescope

Primary mirror diameter 0.4 mCombined focal length 1.8 mField of view 0.5 mrad

LASER: Nd:YAG laser (Quanta Systems – SYL 202)

Max. Pulse Energy@ 355nm 250 mJMaximum repetition rate 20HzBeam divergence 0.5 mradPulse duration 5 ÷ 6 ns

SPECTRAL SELECTION: based on Interference Filters

Wavelength (nm) 532 355 387 407 354.1-5 352.5-353.5Bandwidth (nm) 1.0 0.5 1.0 0.3 0.3 1.0

Out-of-band blocking 10-6 10-6 10-10 10-10 10-6 10-6

CW Transmission (%) 50 30 30 30 30 30

Aerosol/clouds N2 H2O T(LoJ) T(HiJ)

BASIL


Optimized for both night-time and day-time operation

Vertical pointing capability only

BASIL Measurement precision

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

0 10 20 30 40

Random Error (%)

Hei

ght (

m)

night day

DIFA-Univ. Basilicata

• day <5% up to 2 km• night <2% up to 2 km, <20% up to 6km

Water Vapor Mixing Ratio

0

3000

6000

9000

12000

15000

1E-3 0.01 0.1 1 10

LIDARz=60 m up to 8 kmz=300 m above 8 km

8 September 2004

DIFA-Univ. Basilicata

Water vapour mixing ratio (g/kg)

Hei

ght (

m)

Lidar (20:49-21:19 GMT) Sonde (20:49 GMT)5 minute

150 meters

t=5 min, z=150 meters

Up to 13 km with 30 min time integration3rd COPS & GOP Workshop, 10/11 April

BASIL Measurement precision

t=5 min, z=150 meters• day < 2 K up to 2 km• night <1 K up to 2 km, <2 K up to 7 km

Temperature

0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

34

36

38

160 180 200 220 240 260 280 300 320 -4 -2 0 2 4

09-Sep-04

(a)

Temperature (K)

Hei

ght (

km)

Sonde (22:00) Lidar

(0-26 km, 21:30-23:00) (26-36 km, 18:33-03:03)

T

(b)

BASIL

Up to 26 km with 1h30 min time integrationUp to 36 km with ≈ 8h min time integration


0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

0 10 20

Random Error (K)

Hei

ght (

m)

night day

t = 5 minutez = 150 meters

BASIL

22:13 00:33 02:55

GMT Time

BASIL - DIFA - Univ. of Basilicata Lidar (Lat: 40°38'45.23" N, Long: 15°48'29.32" E, Site elevation: 730 m)

06-07 September 2004 – Particle backscattering at 355 nm (m-1 sr-1)

17:32 19:52

11

10

9

5

4

3

2

6

8

7

12

T = 1 min, z = 30 m

Hei

gh

t a.

s.l.

(m

)


GMT Time

(g/Kg)

11

10

9

5

4

3

2

6

8

7

12

22:13 00:33 02:5517:32 19:52

T = 1 min, z = 30 m


06-07 September 2004 – Water vapour mixing ratio

Hei

gh

t a.

s.l.

(m

)


(m-1)

02:55

GMT Time

11

10

9

5

4

3

2

6

8

7

12

22:13 00:3317:32 19:52

T = 1 min, z = 300 m


06 September 2004 – Particle extinction at 355 nm

Hei

gh

t a.

s.l.

(m

)


(sr)

GMT Time


06 September 2004 – Extinction-to-backscatter ratio at 355 nm

GMT Time

11

10

9

5

4

3

2

6

8

7

12

22:13 00:33 02:5517:32 19:52

T = 1 min, z = 300 m

Hei

gh

t a.

s.l.

(m

)

Lidar ratio 20-25 sr Typical for cirrus clouds & altostratus

Lidar ratio 40-80 sr Typical for aerosols in PBL

(K)

GMT TimeGMT Time

11

10

9

5

4

3

2

6

8

7

22:13 00:33 02:5517:32 19:52


06 September 2004 – Temperature

T = 5 min, z = 300 m

Hei

gh

t a.

s.l.

(m

)


GMT TimeGMT Time

11

10

9

5

4

3

2

6

8

7

12

22:13 00:33 02:5517:32 19:52

Hei

gh

t a.

s.l.

(m

)

T = 10 min, z = 300 m

%


06 September 2004 – Relative humidity (with respect to water)

Upper tropospheric humidification due to cirrus sublimation

730

5530

3130

7930

10330

12730

GMT Time

BASIL (Lat: 40°38'45.23" N, Long: 15°48'29.32" E, Site elevation: 730 m)

01-03 October 2005 – Water Vapour mixing ratio (g/Kg)

Hei

gh

t a.

s.l.

(m

)

18:1518:05 10:25 02:1502:35

T=10min; z=75m <5km 150m >5km

01 October02 October

03 October

Log Scale

Dry stratospheric intrusion episode associated with a of tropopause folding event


730

5530

3130

7930

10330

12730

Hei

gh

t a.

s.l.

(m

)

UT Time

1-2 October 2005 – Water Vapour mixing ratio (g/kg)

18:05 21:40 01:15 04:50 08:25

Log Scale


730

5530

3130

7930

10330

12730

Hei

gh

t a.

s.l.

(m

)

UT Time

1-2 October 2005 – Atmospheric temperature (K)

18:05 21:40 01:15 04:50 08:25


730

5530

3130

7930

10330

12730

Hei

gh

t a.

s.l.

(m

)

UT Time

1-2 October 2005 – Relative humidity (%)

18:05 21:40 01:15 04:50 08:25

Log Scale


2000

4000

6000

8000

10000

0.1 1 10

Water vapour mixing ratio (g/kg)

Hei

ght (

m)

Sonde 01 Oct 05, 23:51 Lidar 10 min z = 30m

T=10min;

z=150m

WATER VAPOUR MIXING RATIO

Data provided for assimilation purposes: Specific humidity

Atmospheric temperature

Vertical resolution for water vapour: 75 m up to 5 km 150 m above 5 km

Vertical resolution for temperature 600 m

Based on the requests from the data assimilation people,

10 minute integration time (6 profiles per hour)

This allows to get a measuement error not exceeding 20 % up to approx. 7-8 km at night and up to approx. 4 km in daytime.

Data have been delivered in NetCDF format.


BACK-UP SLIDES

730

5530

3130

7930

10330

12730

GMT Time

Univ. of Basilicata Lidar (Lat: 40°38'45.23" N, Long: 15°48'29.32" E, Site elevation: 730 m)


Hei

gh

t a.

s.l.

(m

)

09:2517:55 04:15 14:5522:55

T=10min; z=75m <5km 150m >5km

11 October 12 October

13:35

730

5530

3130

7930

10330

12730

GMT Time



Hei

gh

t a.

s.l.

(m

)

09:2517:55 04:15 14:5522:55

T=10min; z=75m <5km 150m >5km


13:35

Log Scale

730

5530

3130

7930

10330

12730

GMT Time


11-12 October 2005 – Relative error (%)

Hei

gh

t a.

s.l.

(m

)

09:2517:55 04:15 14:5522:55

T=10min; z=75m <5km 150m >5km


13:35

Log Scale

0

2000

4000

6000

0.1 1 10

water vapour mixing ratio (g/kg)

Hei

ght (

m)

Sonde 23_55 11Oct05 Lidar 10 min z = 30m

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

200 220 240 260 280 300

Temperature (K)

Hei

ght (

m)

Temperature Sonde 23:55 11 Oct 05 Lidar 10 min z = 300m

WATER VAPOUR MIXING RATIO TEMPERATURE

730

5530

3130

7930

10330

12730

GMT Time


11-12 October 2005 – Temperature (K)

Hei

gh

t a.

s.l.

(m

)

17:55 04:15 14:5522:55

T=10min; z=600 m


730

5530

3130

7930

10330

12730

GMT Time


11-12 October 2005 – Temperature error (K)

Hei

gh

t a.

s.l.

(m

)

17:55 04:15 14:5522:55

T=10min; z=600 m


730

5530

3130

7930

10330

12730

GMT Time



T=10min; z=75m <5km 150m >5km

Hei

gh

t a.

s.l.

(m

)

18:1518:05 10:25


03 October

02:1502:35

Stratospheric dry air intrusion associated with a of tropopause folding event

PV-streamer event

730

5530

3130

7930

10330

12730

GMT Time


01-03 October 2005 – Relative error (%)

Hei

gh

t a.

s.l.

(m

)

18:1518:05 10:25 02:1502:35

T=10min; z=75m <5km 150m >5km


03 October

730

5530

3130

7930

10330

12730

PRELIMINARY DATAT=1min z=30m

Hei

gh

t a.

s.l.

(m

)

GMT Time

1 October 2005 – water vapour mixing ratio (g/kg)

17:48 21:36 01:12 04:49 08:26


730

5530

3130

7930

10330

12730

PRELIMINARY DATA

T=5min z=300m

Hei

gh

t a.

s.l.

(m

)

GMT Time

1 October 2005 – Temperature °K

17:48 21:36 01:12 04:49 08:26

TO BE CORRECTED

FOR PILE_UP

Same trend on the temperature and humidity mapThe dry layer tongue is associated with lower temperatues


730

5530

3130

7930

10330

12730

GMT Time




Hei

gh

t a.

s.l.

(m

)

8:3817:13 16:2400:55 00:12

FOG

16:12 19:24 22:17

730

3130

1930

4330

5530

6730

GMT Time

Wave structures underlieing thick clouds and appearing to be associated with the approachig of the cloud system

12 September 2005 – Water Vapour mixing ratio

14:52

(g/Kg)

PRELIMINARY DATAT=1min z=30m 12 Oct,10:30-12 Oct, 22:20 GMT

waves

THICK CLOUDS

730

5530

3130

7930

10330

12730

GMT Time



Hei

gh

t a.

s.l.

(m

)

21:00 03:4414:17 10:28

STRONG CONVECTIVE ACTIVITY

STRONG CONVECTIVE ACTIVITY

23:36 03:54 06:40

GMT Time

Cloud formation possibly associated with the propagation of a gravity wave

27-28 September 2005 – Water Vapour mixing ratio

14:57 19:15

(g/Kg)


730

5530

3130

7930

10330

12730

27 Sept,14:55-28 Set, 18:15 GMT

CLOUDS

wave

23:36 03:54 06:40

GMT Time

14:57 19:15


730

5530

3130

7930

10330

12730

Cloud formation possibly associated with the propagation of a gravity wave

27-28 September 2005– Particle backscattering at 355 nm (m-1 sr-1)

CLOUDS

wave

730

5530

3130

7930

10330

12730


Hei

gh

t a.

s.l.

(m

)

GMT Time

1 October 2005– Particle backscattering at 355 nm(m-1 sr-1)

17:48

Stratospheric dry intrusion event probably associated with a of tropospheric folding event

Measured parameters: particle backscatter at 355 and 532 nm, particle extinction at 355 nm, lidar...

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Transcript of Measured parameters: particle backscatter at 355 and 532 nm, particle extinction at 355 nm, lidar...