Zobrazeno 1 - 10
of 176
pro vyhledávání: '"S. Sandven"'
Autor:
T. Vihma, P. Uotila, S. Sandven, D. Pozdnyakov, A. Makshtas, A. Pelyasov, R. Pirazzini, F. Danielsen, S. Chalov, H. K. Lappalainen, V. Ivanov, I. Frolov, A. Albin, B. Cheng, S. Dobrolyubov, V. Arkhipkin, S. Myslenkov, T. Petäjä, M. Kulmala
Publikováno v:
Atmospheric Chemistry and Physics, Vol 19, Pp 1941-1970 (2019)
The Arctic marine climate system is changing rapidly, which is seen in the warming of the ocean and atmosphere, decline of sea ice cover, increase in river discharge, acidification of the ocean, and changes in marine ecosystems. Socio-economic activi
Externí odkaz:
https://doaj.org/article/e9b12e6b2d044d26bda910123e9bf40a
Autor:
T. Lavergne, A. M. Sørensen, S. Kern, R. Tonboe, D. Notz, S. Aaboe, L. Bell, G. Dybkjær, S. Eastwood, C. Gabarro, G. Heygster, M. A. Killie, M. Brandt Kreiner, J. Lavelle, R. Saldo, S. Sandven, L. T. Pedersen
Publikováno v:
The Cryosphere, Vol 13, Pp 49-78 (2019)
We introduce the OSI-450, the SICCI-25km and the SICCI-50km climate data records of gridded global sea-ice concentration. These three records are derived from passive microwave satellite data and offer three distinct advantages compared to existing r
Externí odkaz:
https://doaj.org/article/cd5b1215709f473baf70325cb28d4f4a
Autor:
E. V. Shalina, S. Sandven
Publikováno v:
The Cryosphere, Vol 12, Pp 1867-1886 (2018)
The snow data from the Soviet airborne expeditions Sever in the Arctic collected over several decades in March, April and May have been analyzed in this study. The Sever data included more measurements and covered a much wider area, particularly i
Externí odkaz:
https://doaj.org/article/3a292de214a04600bae2fc75574e38af
Autor:
S. Muckenhuber, S. Sandven
Publikováno v:
The Cryosphere, Vol 11, Pp 1835-1850 (2017)
An open-source sea ice drift algorithm for Sentinel-1 SAR imagery is introduced based on the combination of feature tracking and pattern matching. Feature tracking produces an initial drift estimate and limits the search area for the consecutive p
Externí odkaz:
https://doaj.org/article/54f9fa85e2f24ef0add739994f5ea480
Autor:
C. J. Merchant, F. Paul, T. Popp, M. Ablain, S. Bontemps, P. Defourny, R. Hollmann, T. Lavergne, A. Laeng, G. de Leeuw, J. Mittaz, C. Poulsen, A. C. Povey, M. Reuter, S. Sathyendranath, S. Sandven, V. F. Sofieva, W. Wagner
Publikováno v:
Earth System Science Data, Vol 9, Pp 511-527 (2017)
The question of how to derive and present uncertainty information in climate data records (CDRs) has received sustained attention within the European Space Agency Climate Change Initiative (CCI), a programme to generate CDRs addressing a range of
Externí odkaz:
https://doaj.org/article/e97224904059454083146812a80ef4e6
Publikováno v:
The Cryosphere, Vol 11, Iss 1, Pp 33-46 (2017)
Synthetic Aperture Radar (SAR) data from RADARSAT-2 (RS2) in dual-polarization mode provide additional information for discriminating sea ice and open water compared to single-polarization data. We have developed an automatic algorithm based on dual-
Externí odkaz:
https://doaj.org/article/47a9b1ea037e44e3826c24594f6f77b1
Publikováno v:
Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 71, Iss 1 (2019)
Internal waves in the ocean play an important role in turbulence generation due to wave-breaking processes and mixing of the ocean. Airborne radar images of internal waves and ocean eddies north of Svalbard suggested that ocean eddies could generate
Externí odkaz:
https://doaj.org/article/8a8aeee70fd343818e0e0c78648206fc
Publikováno v:
The Cryosphere, Vol 10, Iss 2, Pp 913-925 (2016)
A computationally efficient, open-source feature-tracking algorithm, called ORB, is adopted and tuned for sea ice drift retrieval from Sentinel-1 SAR (Synthetic Aperture Radar) images. The most suitable setting and parameter values have been found us
Externí odkaz:
https://doaj.org/article/5cb769eb00b342a69f32aade8655a51c
Publikováno v:
The Cryosphere, Vol 10, Iss 1, Pp 149-158 (2016)
A satellite database including 16 555 satellite images and ice charts displaying the area of Isfjorden, Hornsund, and the Svalbard region has been established with focus on the time period 2000–2014. 3319 manual interpretations of sea ice condition
Externí odkaz:
https://doaj.org/article/aada0895fd8547bb84eeabfe6b0385bc
Autor:
S. Kern, K. Khvorostovsky, H. Skourup, E. Rinne, Z. S. Parsakhoo, V. Djepa, P. Wadhams, S. Sandven
Publikováno v:
The Cryosphere, Vol 9, Iss 1, Pp 37-52 (2015)
We assess different methods and input parameters, namely snow depth, snow density and ice density, used in freeboard-to-thickness conversion of Arctic sea ice. This conversion is an important part of sea ice thickness retrieval from spaceborne altime
Externí odkaz:
https://doaj.org/article/bae3626382514d9f9c66149ea3d4938d