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P-T-fluid evolution and oxygen fugacity variations interpreted from calc-silicate granulite of Rundvågshetta, Lützow-Holm Complex, East Antarctica
Get PDFThe 15th Symposium on Polar Science/Ordinary sessions [OG] Polar geosciences, Wed. 4 Dec. / Entrance Hall (1st floor), National Institute of Polar Researchconference outpu
Preliminary report of REE compositions of zircon and garnet in a sillimanite-biotite-garnet gneiss from Mefjell, Sør Rondane Mountains, East Antarctica
Get PDFThe 15th Symposium on Polar Science/Ordinary sessions [OG] Polar geosciences, Wed. 4 Dec. / Entrance Hall (1st floor), National Institute of Polar Researchconference outpu
Horizontal phase velocity analysis of gravity waves observed by OH arirglow imaging at Rio Gallegos, Argentina, near Andes
Get PDFThe 15th Symposium on Polar Science/Ordinary sessions [OS] Space and upper atmospheric sciences, Wed. 4 Dec. / 3F Conference room, The Institute of Statistical Mathematicsconference outpu
Time variations of nitric oxide in the mesosphere and lower thermosphere over Antarctica associated with magnetic storms
Get PDFThe 15th Symposium on Polar Science/Ordinary sessions [OS] Space and upper atmospheric sciences, Wed. 4 Dec. / 3F Conference room, The Institute of Statistical Mathematicsconference outpu
Roles of plasma sheet flow and the M-I coupling convection in reproducing the substorm with the global simulation
Get PDFThe 15th Symposium on Polar Science/Ordinary sessions [OS] Space and upper atmospheric sciences, Wed. 4 Dec. / 3F Conference room, The Institute of Statistical Mathematicsconference outpu
NLC Imager for observations in the high latitude region. -The test observation in Kiruna, Sweden
Get PDFThe 15th Symposium on Polar Science/Ordinary sessions [OS] Space and upper atmospheric sciences, Wed. 4 Dec. / Entrance Hall (1st floor), National Institute of Polar Researchconference outpu
Progress report on the imaging receiver system at the SuperDARN Hokkaido East radar (2024)
Get PDFThe 15th Symposium on Polar Science/Ordinary sessions [OS] Space and upper atmospheric sciences, Wed. 4 Dec. / Entrance Hall (1st floor), National Institute of Polar Researchconference outpu
Upper thermospheric orthohelium, He(23S) , variations associated with a moderate storm in February 2023: the NIRAS-2 observations at Longyearbyen (78.1°N, 16.0°E), Svalbard.
Get PDFThe 15th Symposium on Polar Science/Ordinary sessions [OS] Space and upper atmospheric sciences, Wed. 4 Dec. / Entrance Hall (1st floor), National Institute of Polar Researchconference outpu
Formation of subaerial taliks in Larsemann hills, princess Elizabeth land, East Antarctica
No full textThis study presents a mathematical model of heat and mass transfer for modelling the formation and evolution of taliks in the upper subsurface of the Larsemann Hills in East Antarctica. Four simulation scenarios were considered. The first one showed that thawed areas cannot form under snowfields. The second and third scenarios demonstrated the taliks did not form if the snow melted immediately after set the positive air temperatures and covered the surface 20 days before the set of negative air temperatures or immediately after that. According to the last scenario, talik forms when snow cover persists even with positive air temperature, and snow falls before the air temperature becomes negative. Modelling demonstrates that taliks in the Larsemann Hills exist, but they are mostly in an unstable state.journal articl
Reconstruct the AMSR-E/2 thin ice thickness algorithm to create a long-term time series of sea-ice production in Antarctic coastal polynyas
No full textThis study presented an extended time series of ice production in Antarctic coastal polynyas for 20 years of 2002–21 using high spatial resolution satellite data from passive microwave sensors: the Advanced Microwave Scanning Radiometer for EOS (AMSR-E) and the Advanced Microwave Scanning Radiometer 2 (AMSR2). For this, we reconstructed the previously presented thin ice thickness algorithms and re-estimated ice production by replacing atmospheric input data for the heat flux calculations with the newly released ECMWF Reanalysis v5 (ERA5). The consistency of ice production between AMSR-E and AMSR2, whose operation periods do not overlap, was confirmed from comparisons with ice production by the Special Sensor Microwave/Imager (SSM/I) and the Special Sensor Microwave Imager Sounder (SSMIS) with relatively coarse spatial resolution. The open ocean area, which cannot be detected from the thin ice thickness algorithm, was defined using sea-ice concentration (SIC) from AMSR-E and AMSR2. The satellite derived SIC has been suggested to be underestimated in the new thin ice (polynya) area. The effect of the underestimation on the ice production estimation was evaluated. The underestimation of SIC from three major algorithms was also investigated from comparisons with the thin ice thickness presented in this study. The coastal polynya dataset covering 20 years with the higher spatial resolution presented in this study is vital for climate-change-related studies.journal articl