Comparing the Satellite Microwave and Visual Shipborne Sea Ice Concentration

The total ice concentration from satellite microwave data derived by three algorithms NASA Team, ASI and VASIA2 was used to compare with special shipborne observations. Visual observations were carried out during 15 scientifi c expeditions in the Arctic. The data were compared by various gradations of ice concentration (very open, open, close, very close and compact ice) for summer and winter seasons. Generally, in summer period the NASA Team algorithm underestimates total ice concentration by 1 tenth, ASI and VASIA2 algorithms – by 0.5 tenth in comparison to the shipborne data. All three algorithms overestimate total ice concentration in areas of very open ice and underestimate in areas of close, very close and compact ice. The mostly pronounced diff erences are fi xed in areas of open ice, which are typical for the ice edge zones. In winter period the mean error does not exceed 1 tenth, however, in areas of very open and close ice the mean error is signifi cantly higher than in summer period. Melting stage observed from the ships was used to estimate infl uence of ice melting processes on satellite microwave ice concentration. The mean error reaches –2.9 tenth for the NASA Team algorithm,—2.8 tenth for the ASI algorithm and –5.0 tenth for the VASIA2 algorithm, when area of melt ponds on sea surface is maximal. The results obtained in the paper are useful to determine the range of decreasing of ice extent in the Arctic, observed last years.

Keywords

satellite microwave radiometry, algorithms, shipborne ice observations, ice concentration, ice melting

Acknowledgment

This work was supported by the FANO (the topic “Monitoring”, state registration No. 01.20.0.2.00164) (V. Tikhonov, M. Raev, E. Sharkov); with the support of the Ministry of Education and Science of the Russian Federation, agreement No. 14.616.21.0078 (RFMEFI61617X0078). Satellite data processing (NASA Team and ASI algorithms) was carried out within the framework of grant 2007/2008 from Otto-III laboratory

Received

27.12.2018

Publication date

27.12.2018

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GOST	Alekseeva T., Sharkov E., Tikhonov V., Frolov S., Raev M., Repina I., Sokolova Y., Afanaseva E., Serovetnikov S. Comparing the Satellite Microwave and Visual Shipborne Sea Ice Concentration // Issledovanie Zemli iz kosmosa – 2018. – Issue 6 C. 65-76 [Electronic resource]. URL: http://ras.jes.su/izk/s020596140003369-6-1-en (circulation date: 29.04.2024). DOI: 10.31857/S020596140003369-6
MLA	Alekseeva, T., Sharkov, E., Tikhonov, V., Frolov, S., Raev, M., Repina, I., Sokolova, Yu, Afanaseva, E., Serovetnikov, S. "Comparing the Satellite Microwave and Visual Shipborne Sea Ice Concentration." Issledovanie Zemli iz kosmosa 6 (2018):65-76. DOI: 10.31857/S020596140003369-6
APA	Alekseeva T., Sharkov E., Tikhonov V., Frolov S., Raev M., Repina I., Sokolova Y., Afanaseva E., Serovetnikov S. (2018). Comparing the Satellite Microwave and Visual Shipborne Sea Ice Concentration. Issledovanie Zemli iz kosmosa (6), pp.65-76 DOI: 10.31857/S020596140003369-6

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