bsrn xi meeting 2010/04 gaw-pfr network and its calibration christoph wehrli and stephan nyeki...

BSRN XI meeting 2010/04

GAW-PFR Network and its CalibrationChristoph Wehrli and Stephan Nyeki

1. Network extent and growth

2. Upgrade for NRT operation and rapid delivery

3. Maintenance of reference TRIAD and network calibration


GAW-PFR Network & Customer sites

Mauna LoaDanum Valley

Izaña

Cape Point

Ny Ålesund

Mace Head

HohenpeissenbergJungfraujoch

Bratts Lake

Ryori

Alice Springs

Waliguan

● ●Cabauw

(Summit)

Sweden 3Finland 2

Japan +3

Antarctica 3

Germany +3

12 GAW & 19 NMHI stations

Valentia

●

Switzerland +3


GAW-PFR Network Associate Stations

Scandinavia

Jokioinen, FI, FMI

Kiruna, SE, SMHI

Norrköping, SE, SMHI

Sodankylä, FI, FMI

Visby, SE, SMHI

Central Europe

Valentia, IE, MetEire

Cabauw, NL, KNML

Zingst, DE, DWD

Lindenberg, DE, DWD

Zugspitze, DE, DWD

Antarctica

Marambio, AQ, FMI

Troll, AQ, NILUSodankyla

Jokioinen

Visby

Valentia Cabauw

Norrkoeping

Kiruna

ZingstLindenberg

Zugspitze


GAW-PFR Network collected data

STA 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Months

ASP 9 12 12 12 12 12 12 12 93

BLO 8 12 12 10 9 12 12 12 12 99

DAV 12 12 12 12 12 12 12 12 12 12 12 132

HPB 5 12 12 11 11 12 12 12 12 12 12 123

IZN 7 12 12 12 12 12 12 12 10 101

JFJ 12 12 12 12 12 12 12 8 3 12 11 118

MHD 2 8 12 12 10 12 11 12 12 3 11 105

MLO 2 11 12 12 12 12 12 12 12 12 12 121

NAS 5 7 6 7 7 6 8 6 52

RYO 9 12 12 12 12 12 12 12 93

DMV 8 12 12 32

CPT 11 12 23

WLG 9 9

CAB 5 12 12 29

VAL 3 12 6 21

JOK 2 2

SDK 2 2

MBINRK 2 9 12 23

KIR 12 11 12 35

VIS 12 12 12 36

TRO 4 4

5 5 7 10 10 10 10 10 16 18 20 1253


NRT or Rapid Delivery of AOD• GAW Strategic plan 2008 - 2015 calls for NRT delivery

of some data (like O3, AOD) for assimilation in and validation of Numerical Weather Prediction, Air Quality Monitoring, and chemical weather forecast models

• WIGOS/WIS Pilot Project GAW 2008 – 2010• GAW-WDCA @NILU ready to accept NRT data 2010/01• ET-NRT-CDT kick-off Meeting 2010/03


WIS – GAW Architecture

National Centers(includes WIS NC's)

GAWSIS Web site

Observing systems contributing to GAW

Da

ta a

nd

Pro

duct

Use

rs

WIS Global Information System

Centres (GISC's)

GlobalAtmosphere

Watch (GAW)

WMO Information

System(WIS)

GAW Web site

World Data Centres(also known as WIS DCPC's)

Courtesy Eliot Christian, WMO presentation for ET-NRT WS2010


Data exchange through GTS/WIS

KEY:

NC = National Centres GISC = Global Information

System Centres DCPC = Data Collection or

Production Centres


GAW-PFR network data flow

PFRLogger

WORCC

GAW Station WDCA

hourly (TCP/IP)

daily (FTP)monthly (email)

QA annually

Acts like a DCPC, but outside

WIGOS

Acts like a GISC, but outside

WIGOS

daily (FTP)


Calibration Hierarchy

• CIMO recommendation for AOD to be traceable to WORCC

• Comparison Campaign à la FRC-III• On site comparison at co-locations


Network Calibration Hierarchy

• Langley calibration for Master PFR at high altitude sites MLO, IZO, JFJ

• Triad of reference PFR maintained at Davos

• Side by side comparison of field PFR every 1 – 3 years, instrument swap

• In-situ calibration by Langley method at suitable stations

• Travelling standard PFR comparison SIMBA98 stratospheric

balloon experiment


Maintenance of Reference TRIAD

Goal: cross calibration between each 2 references ≤1% ! (0.5%)

Relative measure of stability – generic ageing still possible

2008

R G B V

A / C 1.003

0.997

1.000

1.000

B / C 1.003

1.004

0.999

1.007

A / B 1.001

0.993

0.995

0.995

CB

A

1%


Calibration History

Langley statistics over 12 months (N≈125),confirmed by Langley at MLO.CV< ≈ 1%, annual drift <0.5%

Langley Calibrations at Bratt's LakeGBV avg. trend -0.3%/y; R +0.03%/y

3.2

3.4

3.6

3.8

4.0

J an01

J ul01

J an02

J ul02

J an03

J ul03

J an04

J ul04

J an05

J ul05

J an06

J ul06

J an07

J ul07

J an08

J ul08

J an09

J ul09

EA

V

Dav

os

Mauna Loa

Comparison to WORCC Triad (Ny Ålesund)RGB avg. trend <0.3%/y; V +0.4%/y

3.2

3.4

3.6

3.8

4.0

J an 02 J an 03 J an 04 Dez 04 J an 06 J an 07 J an 08 Dez 08

EAV

Annual re-calibration during polar night

U95< 1%, annual drift <0.5%


Traceability (intercomparisons)

2005) FRC-II intercomparison Davos, 14 instruments

2006) AERONET – GAW comparison at 3 co-location

PolarAOD campaign @Ny Ålesund

2007) EUSAAR intercomparison, 6 instruments, September

2008) EUSAAR site audits at 3 stations

PolarAOD @Izaña, October

2009) EUSAAR site audits at 2 stations

2010) FRC-III intercomparison Davos


Second Filter Radiometer Comparison

FRC-II

Participating Institutions (9) and Instruments (15)

• WORCC (CH) PFR N01, N26, N27, CIMEL#354• DWD (Germany) PFR N33• SMHI (Sweden) PFR N35• MSC (Canada) PFR N23, CIMEL#24• BOM (Australia) SPO2#1020, #1031, PFR N19• MS (UK) SPO2#1017• NOAA (USA) SPO2#1022• IES/Ispra (EU) ASR 1003• U. Colima (Mexico) PFR N20 ( for repair & calibration)

26th September – 14th October, 2005 at Davos


FRC-II 2005

6 8 10 12 14 16 18-0.01

-0.005

0

0.005

0.01

0.015

0.02

0.025

CET on 2005-10-10

dA

OD

@50

0±3n

m (

Avg

.)

1 2 3 4 5 6 7 8 9 10 11 12 13 14

-5

0

5

10

15

20

1000

*dA

OD

@50

0nm

(A

vg.)

Radiometer number

GAW Criterion: 95% of >1000 samples on >5 days within ΔAOD ≤ 0.005 + 0.01/m


Co-location Davos 2008

L1.5 500 865

MBD -0.008 -0.001

RMS 0.010 0.005

Prcnt 73 96

1 2 3 4 5

-0.02

0

0.02

AO

D(C

ML

-1.5

- P

FR

) Period: 2008-01-01 ÷ 2008-10-24

1 2 3 4 5

-0.02

0

0.02

Airmass

AO

D(C

ML

-1.5

- P

FR

)

1 2 3 4 5

-0.02

0

0.02

AO

D(C

ML

-2.0

- P

FR

) Period: 2008-01-02 ÷ 2008-10-24

1 2 3 4 5

-0.02

0

0.02

Airmass

AO

D(C

ML

-2.0

- P

FR

)

L2.0 500 865

MBD -0.003 0.001

RMS 0.006 0.005

Prcnt 91 98

N = 3898; agreement in cloud-screening: 92%

L1.5

L2.0


EUSAAR Audits 2008

Cabauw Ispra

N = 500 / 950; MBD <0.001, Prct 85%


PFR network web access

•Daily summary plots

•Numerical values with metadata are available by email upon request.

•Hourly means in NARSTO format are available from WDCA, updated annually.

Annual mean plot

Quick-look plots

http://www.pmodwrc.ch/worcc


GAW AOD Network metadata

• GAWSIS lists multi-wavelength AOD at 49 stations including some metadata

• WDCA archive has metadata in NARSTO format

• PFR Network maintains metadata at WORCC and WDCA


World Data Center Aerosols WDCA Data Directory (2009)Station w. AOD start end dataAlice Springs Apr-02 2002-2007Bratt's Lake May-01 2001-2007Hohenpeissenberg Nov-93 1993-2005

J ul-00 2000-2007Izaña J ul-00 2000-2007J okioinen J un-04 2004-2007J ungfraujoch Apr-99 1999-2006Lindenberg Mar-86 1986-2005Mace Head Mar-00 2001-2007Mauna Loa Dec-99 2000-2007Minamitorishima J an-95 2003-2004Ny Ålesund May-02 2002-2007Potsdam Feb-94 Mar-03 1994-2002Ryori J an-88 2003-2004

Apr-02 2002-2007Yonagunijima J an-98 2003-2004Zingst Apr-87 1987-2005Zugspitze J an-02 2003-2005

16 Stations, starting in 1986


Mt. Waliguan, China

AOD at Mt. Waliguan is significantly higher than at comparable altitudes

Apr May Jun Jul Aug Sep Oct Nov0.00

0.05

0.10

0.15

0.20

2008

AO

D 5

00

nm

MLO (3400m)

WLG (3810m)

JFJ (3580m)


Sunrise at Mt. Waliguan, courtesy J. Sun, CAMS


Daily quick-look AOD plots

Incoming raw data QC AOD results


Annual hourly and monthly means

bsrn xi meeting 2010/04 gaw-pfr network and its calibration christoph wehrli and stephan nyeki...

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