IOM Report, 119. Guidance on the computation of calibration uncertainties

Duvernoy Jérôme; World Meteorological Organization (WMO) - WMO, 2015

English

 Guidance on the computation of calibration uncertainties

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Jérôme Duvernoy ; World Meteorological Organization (WMO)

Published by: WMO ; 2015

Collection(s) and Series:  IOM Report- No. 119

Language(s): English

Format: Digital (Free)

Tags: Observations ; Meteorological instrument ; Hydrometeorological instrument ; Automated Weather Observing System (AWOS) ; Global Space-based Inter-Calibration System (GSICS) ; WMO Integrated Global Observing System (WIGOS) ; OBS - Personnel performing instrument calibrations ; Instruments and Methods of Observation Programme (IMOP) Add tag

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Instruments and Methods of Observation Programme (IMOP) Knowledge-Sharing Portal

Instruments and Methods of Observations Programme - WMO

Purpose of this web portal is to enable Members to share their experience and knowledge on Instruments and Methods of Observation, thus facilitating others' everyday work. The portal contains links to many useful resources shared by WMO Members.

English

 Instruments and Methods of Observation Programme (IMOP) Knowledge-Sharing Portal

  Available online: https://community.wmo.int/activity-areas/imop/knowledge-sharing-portal

Instruments and Methods of Observations Programme

Published by: WMO ; 2020

Purpose of this web portal is to enable Members to share their experience and knowledge on Instruments and Methods of Observation, thus facilitating others' everyday work. The portal contains links to many useful resources shared by WMO Members.

Language(s): English

Format: Digital (Free) (1 webpage with links)

Tags: Observations ; Meteorological instrument ; Hydrometeorological instrument ; Automated Weather Observing System (AWOS) ; Global Space-based Inter-Calibration System (GSICS) ; WMO Integrated Global Observing System (WIGOS) ; Text/ Reading ; OBS - Personnel installing and maintaining instrumentation ; OBS - Personnel managing observing programmes and networks ; OBS - Personnel performing instrument calibrations ; OBS - Personnel performing meteorological observations Add tag

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Radiometric instrumentation: a look ahead

Kirk Thomas D. - 1999

English

 Radiometric instrumentation: a look ahead

Thomas D. Kirk

Language(s): English

Format: Hard copy

Tags: Observations ; Hydrometeorological instrument ; Radiometry Add tag

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 World weather climate and water : WMO - 50 years of forecasting (1999) 

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Evaluation of the accuracy of analysis tools for atmospheric new particle formation

Atmospheric Chemistry and Physics (ACP), Vol. 11. N° 7. Korhonen H.; Sihto S.-L.; Kerminen V.-M.; et al. - Copernicus GmbH, 2011

Several mathematical tools have been developed in recent years to analyze new particle formation rates and to estimate nucleation rates and mechanisms at sub-3 nm sizes from atmospheric aerosol data. Here we evaluate these analysis tools using 1239 numerical nucleation events for which the nucleation mechanism and formation rates were known exactly. The accuracy of the estimates of particle formation rate at 3 nm (J3) showed significant sensitivity to the details of the analysis, i.e. form of equations used and assumptions made about the initial size of nucleating clusters, with the fraction o ...

English

[article] 

Evaluation of the accuracy of analysis tools for atmospheric new particle formation

  Available online: http://dx.doi.org/10.5194/acp-11-3051-2011

H. Korhonen ; S.-L. Sihto ; V.-M. Kerminen ; K.E.J. Lehtinen

in Atmospheric Chemistry and Physics (ACP) > Vol. 11. N° 7 [04/01/2011] . - p.3051-3066

Several mathematical tools have been developed in recent years to analyze new particle formation rates and to estimate nucleation rates and mechanisms at sub-3 nm sizes from atmospheric aerosol data. Here we evaluate these analysis tools using 1239 numerical nucleation events for which the nucleation mechanism and formation rates were known exactly. The accuracy of the estimates of particle formation rate at 3 nm (J3) showed significant sensitivity to the details of the analysis, i.e. form of equations used and assumptions made about the initial size of nucleating clusters, with the fraction of events within a factor-of-two accuracy ranging from 43–97%. In general, the estimates of the actual nucleation rate at 1.5 nm (J1.5) were less accurate, and even the most accurate analysis set-up estimated only 59% of the events within a factor of two of the simulated mean nucleation rate. The J1.5 estimates were deteriorated mainly by the size dependence of the cluster growth rate below 3 nm, which the analysis tools do not take into account, but also by possible erroneous assumptions about the initial cluster size. The poor estimates of J1.5 can lead to large uncertainties in the nucleation prefactors (i.e. constant P in nucleation equation J1.5 = P × [H2SO4]k). Large uncertainties were found also in the procedures that are used to determine the nucleation mechanism. When applied to individual events, the analysis tools clearly overestimated the number of H2SO4 molecules in a critical cluster for most events, and thus associated them with a wrong nucleation mechanism. However, in some conditions the number of H2SO4 molecules in a critical cluster was underestimated. This indicates that analysis of field data that implies a maximum of 2 H2SO4 molecules in a cluster does not automatically rule out a higher number of molecules in the actual nucleating cluster. Our analysis also suggests that combining data from several new particle formation events to scatter plots of H2SO4 vs formation rates (J1.5 or J3) and determining the slope of the regression line may not give reliable information about the nucleation mechanism. Overall, while the analysis tools for new particle formation are useful for getting order-of-magnitude estimates of parameters related to atmospheric nucleation, one should be very cautious in interpreting the results. It is, for example, possible that the tools may have misdirected our theoretical understanding of the nucleation mechanism.

Language(s): English

Format: Digital (Free)

Tags: Aerosols ; Atmosphere ; Hydrometeorological instrument ; Research Add tag

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Meteorological Instrument Performance Characteristics

NCAR's Earth Observing Laboratory ; The COMET Program ; Millersville University - The University Corporation for Atmospheric Research, 2017

This advanced lesson explores the performance characteristics of instrumentation used for meteorological measurements. Static performance characteristics are examined in the context of calibration, which offers a means to determine an instrument's response. Dynamic performance characteristics, including first and second order inputs, are discussed using three classic examples: step or impulse, ramp or time varying, and oscillatory inputs. The lesson provides information about the effects of representativeness and regional homogeneity on measurements, and also describes processes for obtaining ...

English

 Meteorological Instrument Performance Characteristics

  Available online: https://www.meted.ucar.edu/instrumentation/performance_char/

NCAR's Earth Observing Laboratory ; The COMET Program (Boulder, United States of America) ; Millersville University

Published by: The University Corporation for Atmospheric Research ; 2017

This advanced lesson explores the performance characteristics of instrumentation used for meteorological measurements. Static performance characteristics are examined in the context of calibration, which offers a means to determine an instrument's response. Dynamic performance characteristics, including first and second order inputs, are discussed using three classic examples: step or impulse, ramp or time varying, and oscillatory inputs. The lesson provides information about the effects of representativeness and regional homogeneity on measurements, and also describes processes for obtaining quantitative estimates of uncertainty.

Notes: Requires user login with free registration. For non-commercial use.

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Language(s): English

Format: Digital (Free)

Tags: Automated Weather Observing System (AWOS) ; Global Space-based Inter-Calibration System (GSICS) ; WMO Integrated Global Observing System (WIGOS) ; Observations ; Meteorological instrument ; Climate ; Hydrometeorological instrument ; OBS - Personnel managing observing programmes and networks ; OBS - Personnel performing meteorological observations Add tag

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Statement on the occasion of the General Assembly Meeting of the Association of Hydro-meteorological Equipment Industry

Obasi G.O.P; World Meteorological Organization (WMO) - WMO, 2003 (SG's lectures, speeches, statements-No. 231)

English

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Statement on the occasion of the presentation of the Twelfth Professor Dr Vilho Vaisala Award

Obasi G.O.P; World Meteorological Organization (WMO) - WMO, 1996 (SG's lectures, speeches, statements-No. 46)

English

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Commission des instruments et des méthodes d'observation (CIMO) - Douzième session: rapport final abrégé, résolutions et recommandations

Organisation météorologique mondiale (OMM) - OMM, 1998 (OMM-No. 881)

French, English

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Commission des instruments et des méthodes d'observation (CIMO) - Quatorzième session

Organisation météorologique mondiale (OMM) - OMM, 2007 (OMM-No. 1019)

French, English

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Commission des instruments et des méthodes d’observation (CIMO) - Quinzième session: rapport final abrégé, résolutions et recommandations

Organisation météorologique mondiale (OMM) - OMM, 2010 (OMM-No. 1064)

French, English

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Commission des instruments et des méthodes d'observation (CIMO) - Rapport final abrégé de la cinquième session

Organisation météorologique mondiale (OMM) - OMM, 1969 (OMM-No. 252)

French, English

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Commission des instruments et des méthodes d'observation (CIMO) - Rapport final abrégé de la deuxième session

Organisation météorologique mondiale (OMM) - OMM, 1957 (OMM-No. 64)

French, English

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Commission des instruments et des méthodes d'observation (CIMO) - Rapport final abrégé de la dixième session

Organisation météorologique mondiale (OMM) - OMM, 1990 (OMM-No. 727)

French, English

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Commission des instruments et des méthodes d'observation (CIMO) - Rapport final abrégé de la huitième session

Organisation météorologique mondiale (OMM) - OMM, 1982 (OMM-No. 590)

French, English

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Commission des instruments et des méthodes d'observation (CIMO) - Rapport final abrégé de la neuvième session

Organisation météorologique mondiale (OMM) - OMM, 1985 (OMM-No. 651)

French, English

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