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Neoarchean double-sided subduction and continent-continent collision during the assembly of the Kenorland supercontinent: a new tectonic model for the Limpopo Complex in southern Africa
Full text linkThe 15th Symposium on Polar Science/Ordinary sessions [OG] Polar geosciences, Wed. 4 Dec. / Entrance Hall (1st floor), National Institute of Polar Researchconference outpu
Characteristics of precipitation at Syowa Station, Antarctica
Full text linkThe 15th Symposium on Polar Science/Ordinary sessions [OM] Polar meteorology and glaciology, Tue. 3 Dec. / 2F Auditorium, National Institute of Polar Researchconference outpu
Long-term variability of seawater stable oxygen isotope ratio in the Indian Ocean sector of the Southern Ocean
Full text linkThe 15th Symposium on Polar Science/Ordinary sessions [OM] Polar meteorology and glaciology, Tue. 3 Dec. / Entrance Hall (1st floor), National Institute of Polar Researchconference outpu
Kelvin-Helmholtz Instabilities and Tube and Knot Dynamics: The Role of Shear Turbulence in Atmospheric Mixing
Full text linkThe 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
Astronomical observations at Dome Fuji II with Antarctic 30-cm submm telescope
Full text linkThe 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
Differences in iodine chemistry over the Antarctic continent
No full textHigh concentrations of iodine oxide (IO) have been reported over west Antarctica, with areas around the Weddell Sea showing a peak in spring. However, stations in east Antarctica show much lower values during summer, although observations over spring are still missing. Here, we present the first year-long observations of IO outside the Weddell Sea region using a multi-axis differential optical absorption spectrometer (MAX-DOAS) over the Bharati station (69.41°S, 76.19°E). Observations show that iodine chemistry is less active than over the Weddell Sea, even during springtime, with IO mixing ratios below 2 pptv throughout the sunlit period. A slight increase in IO is observed in spring, although it is a factor of 10 lower than the Weddell Sea region. We identify the variations in drivers in the different regions using sea ice concentrations, sea ice thickness and chlorophyll concentrations. We use a global model which uses a parameterization for iodine emissions based on a combination of these factors. The model reproduces the high concentrations over the Weddell Sea and the low concentrations over Bharati throughout the year, shedding light on the environmental factors, sources and chemistry of iodine in Antarctica. Even at small concentrations, iodine can enhance ozone loss caused by bromine chemistry over east Antarctica, although this impact is lower than in the west Antarctic.journal articl
An estimation of atmospheric attenuation on an earth-space radio link operating at Ka-band over Larsemann hills area of Antarctica
No full textThe National Remote Sensing Centre (NRSC) has established its ground station named Antarctica Ground Station for Earth Observation Satellites (AGEOS) at Bharati station located at Larsemann hills area of Antarctica for the tracking and data acquisition from polar orbiting satellites. A communication link through a geostationary satellite in C-band is being used for transferring data to the mainland. There is a need to enhance the data rate in the near future considering the huge volume of data being acquired at AGEOS. A satellite link operating at Ka-band is proposed for accommodating the bandwidth requirements. It is necessary to estimate the worst case atmospheric attenuation at Ka-band over Larsemann hills area for calculating the link margins required. The India Meteorological Department (IMD) has setup a wide range of meteorological instruments at Bharati station and the local data collected for the years 2020, 2021 and 2022 are used in this study. The link is assumed to operate at a frequency of 20 GHz with linear polarization. An exceedance probability of 0.1% is used to arrive at the annual statistics of the attenuation. Recommendations by the International Telecommunication Union (ITU) are followed and the estimation is carried out using MATLAB. An estimated total atmospheric attenuation of 2.28 dB is obtained. The results are used further for carrying out link budgeting for a Ka-band satellite communication link between Bharati station and India.journal articl
南極産菌類の菌株データベースの構築と公開
Full text link極域データサイエンスに関する研究集会II
日時：2024年2月26日（月）13:00〜18:00, 2月27日（火）09:30〜12:00
場所：情報・システム研究機構データサイエンス共同利用基盤施設DS棟1F（大会議室H108），オンライン
主催：情報・システム研究機構データサイエンス共同利用基盤施設極域環境データサイエンスセンターconference objec
超音波積雪深計データの分析の工夫
Full text link極域データサイエンスに関する研究集会II
日時：2024年2月26日（月）13:00〜18:00, 2月27日（火）09:30〜12:00
場所：情報・システム研究機構データサイエンス共同利用基盤施設DS棟1F（大会議室H108），オンライン
主催：情報・システム研究機構データサイエンス共同利用基盤施設極域環境データサイエンスセンターconference objec
宇宙科学・超高層大気科学分野データのデータ駆動型研究への利用促進のためのPythonベースのデータ取得・解析ツール開発
Full text link極域データサイエンスに関する研究集会II
日時：2024年2月26日（月）13:00〜18:00, 2月27日（火）09:30〜12:00
場所：情報・システム研究機構データサイエンス共同利用基盤施設DS棟1F（大会議室H108），オンライン
主催：情報・システム研究機構データサイエンス共同利用基盤施設極域環境データサイエンスセンターconference objec