Approach of UV Climatology in Belgium by Monitoring Ultra Violet Irradiance at the Surface of the E - PowerPoint Presentation

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Slide1

Approach of UV Climatology in Belgium by Monitoring Ultra Violet Irradiance at the Surface of the Earth : The Belgian Network

Didier GILLOTAY (1), Praveen K. PANDEY (2) and Thierry BESNARD (3)

(1) Belgium Institute for Space

Aeronomy

(IASB-BIRA)

(2) Belgian User Support and Operations Centre (B.USOC) 1180 Brussels, Belgium

(3) ATMOS

sarl

, Le MANS France

Slide2

1. The Belgian Network

Slide3

Slide4

Name

Latitude

(°N)

Longitude

(°E)

Altitude

(

amsl

m)

Year of deployment

Climatological characteristics/environment

Uccle

50° 48’

4° 21’

100

1993

Urban area

Redu

50° 00’

5° 09’

450

2004

Forest (close to highway)

Ostend

51° 14’

2° 56’

10

2006

Coastal

Virton

49° 34’

5° 32’

250

2007

Little township

Mol

51° 13’

5° 05’

75

2008

Forest

Mont-

Rigi

50° 31’

6° 05’

700

2011

Forest and peat-bogs

Slide5

Instrument

Modified JY-HD10

Bentham DTM300

Focal length

100 mm

300 mmGratings1200 gr/mm holographic concave200 gr/mm holographicplaneFWHD at 300 nm0.49 nm0.25 nmUsual range280-600 nm280-500 nmWavelength step0.3 nm0.5 nmScan duration400 sec840 secDetectorPMT Hamamatsu R292PMT DH 10 TeDark currentAutomatically removedAutomatically removedStray lightUndetectableUndetectableField of view2π sr (nearly perfect cosine response)2π sr (nearly perfect cosine response)

Spectro-radiometers properties

Slide6

Instrument

Type

Wavelength range

Measurement

Frequency

UV-B meterBroadband280-330 nm; max at 294 nmGlobal1 / minUV-A meterBroadband300-380 nm; max at 330 nmGlobal1 / minPyranometerBroadband300nm-3µmGlobal1 / minUVMFR-77 Narrow bands shadowed300, 305.5, 311.5, 317.5, 325, 332.5, 368 nmFWHM ~2 nmGlobal + diffuse1 / minMFR-77 Narrow bands shadowed415, 500, 615, 673, 870, 940 nm + PARFWHM ~10 nmGlobal + diffuse1 /minGUV25116 Narrow bands305,313,320,340,380 and 395 nm FWHM ~2 nm

Global

1 / minSPUV-1010 Narrow bands300, 310, 318, 368, 500, 610, 675, 778, 862, 1050 nmFWHM ~ 2 nm in UVFWHM ~ 5nm in VisibleFWHM ~ 10 nm in IRDirect1 / min

Broadband and Narrow bands instruments properties

Slide7

2. The Datasets

Slide8

Slide9

Slide10

Slide11

3. Trends

Slide12

Slide13

 

Calculation of

UVBeff Month

deviations (anomalies)

for the station of Uccle

Slide14

Slide15

Slide16

Slide17

Ozone trend: negative before 2000 and not significant after 2000.

Positive UVB trends

in Uccle (urban area) and Redu (close to a highway)

No significant

UVB trends

in Ostend (costal area)We speculate that the different effects are due to the aerosols properties (reduction of urban aerosols due to air cleanless regulations and cleaner exhaust gases)No reduction in maritime aerosols has been observed. First conclusions on trends

Slide18

Effect of Aerosols on UVI

Type of aerosol

UVI with TCO = 306 DU

SZA = 25°

SZA = 70°

AOT (τaer)AOT (τaer)00.10.20.300.10.20.3RefEstΔEstΔEstΔRefEstΔEstΔEstΔMaritime

8.50

8.2538.0757.9170.79

0.70

11

0.67

15

0.66

17

Continental

8.50

8.16

4

7.87

8

7.62

10

0.79

0.69

13

0.65

18

0.63

20

Urban

8.50

7.75

9

7.08

17

6.47

24

0.79

0.64

19

0.57

28

0.52

34

Slide19

CONCLUSIONS

A more detailled study on aerosols properties and concentrations has to be performed to confirm our speculative explanation.

An extended period of measurement at the 3 other stations could help us to better understand the potential UVB trends in rural and forest environments.

Slide20

That’s

all folks !

By: recussi
Views: 0
Type: Public

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Approach of UV Climatology in Belgium by Monitoring Ultra Violet Irradiance at the Surface of the E - Description


Didier GILLOTAY 1 Praveen K PANDEY 2 and Thierry BESNARD 3 1 Belgium Institute for Space Aeronomy IASBBIRA 2 Belgian User Support and Operations Centre BUSOC 1180 Brussels Belgium ID: 792761 Download

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