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International Polar Year 2007–2008 - WMO

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140<br />

IPY 20 07–20 08<br />

instruments on the basis of “Kipp & Zonen” sensors<br />

from The Netherlands (CMP6, CMP11 and CMP21). It<br />

seems to be both advisable and necessary to include<br />

the Russian observations conducted in Barentsburg<br />

into this network. Intercalibration studies in the<br />

framework of this program with the use of Russian<br />

and Norwegian instruments were carried at the<br />

Barentsburg research station in April 2007 and Ny-<br />

Alesund (“Sverdrup” research station of The Norwegian<br />

<strong>Polar</strong> Institute) in April 2008. The joint measurements<br />

by pyranometers M115M and CM11 have allowed us<br />

to obtain representative data for a combined analysis,<br />

reveal discrepancies between the Russian and Dutch<br />

sensors and take into account these corrections in<br />

the analysis of historical and current data aimed<br />

at comparative studies of radiation climate of this<br />

region. For comparative climatic studies, the data of<br />

the Russian station in Barentsburg and the Norwegian<br />

stations in Ny-Alesund were used as the reference and<br />

most representative and long-term stations. These<br />

studies granted mutual access to national data sources<br />

for the both partners thereby providing the data<br />

for their joint analysis. This project is a continuation<br />

and development of the Russian science program<br />

“Research of a meteorological regime and climatic<br />

changes on Svalbard”, carried out by the AARI in the<br />

framework of the IPY and NPI projects “Arctic Climatic<br />

Fig. 2.1-3.<br />

Relationship between<br />

measurements by<br />

Yanishevsky-Savinov<br />

(M115M) and Kipp<br />

and Zonen (CMP11)<br />

pyranometers.<br />

(Ivanov et al., 2008)<br />

Diversity” (ARCDIV).<br />

The conformity between diverse sensors (М115M<br />

and “Kipp & Zonen”) is quite satisfactory as is apparent<br />

from Fig. 2.1-3. The discrepancies of average values<br />

are 6.3 ±5.6 W/m 2 for all observations. They were<br />

maximal at noon, reaching ~36 W/m 2 . Nevertheless,<br />

in total, these discrepancies do not exceed absolute<br />

inaccuracy of measurements (for example, 8% for<br />

M115M).<br />

Contribution of the POLAR-AOD (no. 171)<br />

The principal aim of this project was to establish<br />

a bipolar network of sites, where multi-wavelength<br />

sun-photometers have been used to take regular<br />

measurements of aerosol optical depth (AOD) and<br />

optical properties of aerosols. Integrated regular<br />

measurements of aerosol physical and radiative<br />

properties at a number of polar stations were planned<br />

in order to (i) evaluate the seasonal background<br />

concentrations inferred from AOD measurements,<br />

(ii) define the spectral characteristics and patterns<br />

of the radiative processes induced by both natural<br />

and anthropogenic aerosols, and (iii) ameliorate<br />

the knowledge of physical, chemical and radiative<br />

properties of polar aerosols, and of their horizontal<br />

and vertical distributions and temporal variability,<br />

for better evaluating the role of polar aerosols in the

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