Arctic Circle 2015, October 16-18, Reykjavík - Iceland MeteoMet Project: Metrology Activities in...

Arctic Circle 2015, October 16-18, Reykjavík - Iceland

MeteoMet Project:Metrology Activities in Ny-Ålesund

(Svalbard)

Chiara Musacchio Istituto Nazionale di Ricerca Metrologica (INRiM), Torino, ItalyGuest Researcher and Project Management, MeteoMet Project

Andrea Merlone, Istituto Nazionale di Ricerca Metrologica (INRiM), Torino, Italy

Marion Maturilli, Jürgen GraeserAlfred Wegener Institute for Polar and Marine Research (AWI), Potsdam, Germany

Vito Vitale, Angelo ViolaIstituto di Scienze dell'Atmosfera e del Clima - (ISAC-CNR), Bologna and Roma, Italy


Task 3.5: Construction of a facility for in situ traceable calibration of weather stations including for special purposes and under extreme environmental conditions (high mountains, polar regions)

EDIE-1 - 2014

Arctic

campaign

Ny-Ålesund - International Centre for Arctic Research

research stations from 11 nations

Atmospheric ResearchGlaciology

Marine BiologyEcosystem

Climate Change

…


•temperature and pressure controlled simultaneously and independently

•temperature calibrations in air

•equipped with reference sensors directly traceable to national standards

•obtain meteorological data with well defined calibration uncertainty.

Transportable devices EDIE Earth Dynamics Investigation

Experiment

Generation of traceable values of temperature and pressure in the Earth surface range

Evaluation of mutual influences on sensors – Covariance analisys

steel cylindersvacuum

test zone

copper cylinder

cooling coil with thermostatic fluid

Pressure: 500-1100 hPa, Temperature: -35 °C to 50 °C. Target uncertainty (k=2) of pressure and temperature are 10 Pa and 0.076 °C.


Vertical profiles of T, humidity and wind

contributing to

Daily Radiosonde Daily Radiosonde LaunchesLaunches

Atmospheric ObservatoryAtmospheric Observatoryatmospheric measurements contributing to several international networks


● Reference pressure meter Baratron MKS622

● Reference thermometer GS01 (metallic-enclosed Pt100)

The ground instrumentation used in the Ny-Ålesund GRUAN procedures has been calibrated during the MeteoMet Arctic campaign

pressure

air temperatureGround-based reference observing system

Calibration RangeTemperature -30 °C to 10 °C Pressure 95 kPa to 105 kPa


Calibration curves

Uncertainty contribution PT100 A PT100 B PT100 CTemperature reference 0.011 °C 0.011 °C 0.011 °C

Chamber uniformity 0.006 °C 0.009 °C 0.019 °CSensor under calibration 0.007 °C 0.008 °C 0.014 °C

Calibration curve 0.026 °C 0.017 °C 0.018 °CStandard Uncertainty 0.029 °C 0.022 °C 0.026 °CExpanded Uncertainty

(k=2)0.058 °C 0.044 °C 0.052 °C

2)()( cTbTaTTTTTTc

2),( eTdPTcTbPaPTPPc

Uncertainty contributionPressure reference 0.3 Pa

Chamber uniformity 2.5 PaSensor under calibration 0.3 Pa

Calibration curve 26 PaStandard Uncertainty 26 PaExpanded Uncertainty

(k=2)52 Pa

-30-15

010

-200

-180

-160

-140

-120

-100

95 96 97 98 99100 101

102103

104105

P

/ Pa

T / °CP / kPa


The Climate Change Tower in Ny Ålesund

-30

-25

-20

-15

-10

-5

0

5

10

15

0,100 0,200 0,300 0,400 0,500 0,600

T/

°C

voltage / V

Uncertainty contribution PT100 D PT100 E PT100 F TH Vaisala Temperature reference 0.007 °C 0.007 °C 0.009 °C 0.004 °C Chamber uniformity 0.009 °C 0.009 °C 0.019 °C 0.011 °C Sensor under calibration 0.007 °C 0.008 °C 0.014 °C 0.011 °C Calibration curve 0.026 °C 0.017 °C 0.018 °C 0.003 °C

Standard Uncertainty 0.014 °C 0.023 °C 0.017 °C 0.012 °C Expanded Uncertainty

(k=2) 0.027 °C 0.046 °C 0.033 °C 0.025 °C

Vaisala Thermohygrometer


Main outcome

Open the way for further cooperation...

Improve accuracy

Define Uncertainty Budget

Range of calibration cover measurement condition

Evaluate mutual influence of quantity (Temperature on pressure measurement)

Uncertainty contribution PT100 D Temperature reference 0.007 °C Chamber uniformity 0.009 °C Sensor under calibration 0.007 °C

Calibration curve 0.026 °C Standard Uncertainty 0.014 °C

Expanded Uncertainty (k=2) 0.027 °C

-30-15

010

-200

-180

-160

-140

-120

-100

95 96 97 98 99100 101

102103

104105

P

/ Pa

T / °CP / kPa

On-site dedicated calibration


The experience achieved by MeteoMet and the Thermal Metrology expertise from NMI staff, as the starting point for the creation of a Metrology laboratory in the Ny Ålesund International Centre for Arctic Research.

Facility for temperature sensor calibration Pressure control system for pressure sensor calibration

Permafrost TemperatureSurface Air Temperature

Sea Temperature

Dedicated calibration devices and procedureTraceability to primary standards of the measurements

Special dedicated Calibration chamber EDIE - Calibration of temperature sensor in air


A liquid bath for the calibration of sea, ice and soil thermometers

Total target uncertainty: few millikelvin


Experience achieved for the Boltzmann experiment




Stability and uniformity of few millikelvin


Thank you for the attention

Arctic Circle 2015, October 16-18, Reykjavík - Iceland14


Albedo effect on temperature

Up to now, the influence of the albedo on air temperature measurements using AWSs in high mountain sites has not been measured following metrology considerations, thus evaluation correction curves and/or uncertainty components to the air temperature data.

This influence needs to be studied by performing traceable measurements of the albedo and determining reliable uncertainty calculations.

Task 3.5: High mountains observations: permafrost and albedo


Permafrost• Permafrost thermal data is a key component for

validating hydroclimatic models, land surface models, and climatic change models.

• Permafrost is among the few measurable paleo-climatic elements.

• Establish the best practice for permafrost temperature sensors calibration and measurements techniques.

• A laboratory facility enabling the simulation of a permafrost column of approximately 2 m will be manufactured by INRiM.

• On-site campaing 2015

ARPA alpine site (3000 m) Permaforst Monitoring Network

Task 3.5: High mountains observations: permafrost and albedo

Arctic Circle 2015, October 16-18, Reykjavík - Iceland 17

DTM5080 Pt100 A

analog Pt100 CDTM5080 Pt100 B

DIGIQUARTZ 6000 pressure meter

Calibration RangeTemperature -30 °C to 10 °C Pressure 95 kPa to 105 kPa

Inside of EDIE 1 sensors under calibration and reference standard

Arctic Circle 2015, October 16-18, Reykjavík - Iceland MeteoMet Project: Metrology Activities in...

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