Modelling the response of ice sheets to environmental forcing and projecting future sea level rise within the framework of the SeaRISE community effort

第3回極域科学シンポジウム/特別セッション「これからの北極研究」11月28日（水） 国立極地研究所 2階大会議

IoT measurements of the winter environment around Lake Izunuma, Miyagi

The Tenth Symposium on Polar Science/Ordinary sessions: [OM] Polar Meteorology and Glaciology, Wed. 4 Dec. / Entrance Hall (1st floor) , National Institute of Polar Researc

Sensitivity experiments for the Antarctic ice sheet with varied climate, boundary conditions

第2回極域科学シンポジウム　共通セッション「大気-海洋-雪氷-固体地球の相互作用」 11月15日（火） 統計数理研究所 3階セミナー室

Changes of ice volume evolution on basal sliding mechanisms

第6回極域科学シンポジウム[OM] 極域気水圏11月16日（月）　国立極地研究所１階交流アトリウ

Appearance of ferromagnetism in Pt(100) ultrathin films originated from quantum-well states with possibility of small orbital magnetic moment

Ferromagnetism was observed in a Pt(100) ultrathin film deposited on a SrTiO3(100) substrate. The ferromagnetism, which appears in films with thicknesses of 2.2-4.4 nm, periodically changes with a period of approximately 1 nm (5-6 ML) depending on the film thickness. This is consistent with the period derived from the quantum-well states formed in the thin film. X-ray magnetic circular dichroism measurements were conducted to understand the intrinsic nature of the ferromagnetism in the Pt(100) ultrathin films, and contrary to our expectations, the orbital magnetic moment of pure Pt is much smaller than that of the Pt/ferromagnetic multilayer system. These results suggest that the origin of the large magnetic anisotropy in Pt components cannot be explained only by the amount of spin-orbit coupling in Pt.Comment: 7 pages, 4 figure

ショウワキチ ノ チジョウ キショウ カンソク ソウチ コウシン ゼンゴ ノ データ ノ キンシツセイ ニ ツイテ

昭和基地の地上気象観測装置は,第39・40次隊により1997年と1998年の2カ年計画で更新された. 新システムは,1999年2月1日より正式運用を開始したが,その後1年間は旧装置での観測も継続して行い,両装置の比較のためのデータを取得した. 比較観測の結果から,次のことが分かった.1) 両装置の観測データは,概ね精度の範囲内で一致し,新旧データの均質性が保たれていた.2) しかし,一部の要素については,観測値に僅かであるが無視できない差異が生じていた.3) これらの差異は,測器感部やデータ処理の方法,設置位置の変更など装置の仕様変更に起因していた. 本稿では,これら両装置の観測値の差異とその特徴,データの均質性などについて考察した結果を報告する.The surface meteorological observation system was replaced over two years, 1997 and 1998, at Syowa Station in Antarctica. The new system has been formally operated since February 1st 1999. Operation of the old system was continued for one year afterward in order to compare data from both systems. The results of comparison of both systems are as follows: 1) The observation data from both systems agree within the accuracy of the system. The homogeneity of old and new data has been preserved.2) However, some observed quantities show differences that cannot be disregarded although they are small.3) These differences originated from changes of sensor, data-processing method, and installation position. This paper reports the results considering differences in observational values obtained from the two systems, characteristics of data and homogeneity of data

ダイ46ジ ナンキョク チイキ カンソクタイ キショウブモン ホウコク 2005

この報告は,第46次南極地域観測隊気象部門が,2005年2月1日から2006年1月31日まで昭和基地において行った気象観測結果をまとめたものである.観測方法,測器,統計方法等は第45次隊とほぼ同様である. 越冬期間中,特記される気象現象として,次のものが挙げられる.1) 地上気象観測において,2005年の年平均相対湿度73は高い方から,年平均雲量7.5は多い方からの極値を更新し,年平均風速7.2m/sは大きい方から,年合計雪日数228日は多い方から第2位の記録となった.2) ブリザードの回数は,A級6回,B級9回,C級15回の計30回で平年並みだったが,5月は過去最多の5回を記録した.3) 昭和基地上空のオゾン全量日代表値は,8月下旬から10月中旬までオゾンホールの目安となる220m atm-cm以下の値を継続的に下回り,9月の月平均値は173m atm-cmで,過去4番目に少なかった.10月4日には越冬中の最低値である136m atm-cmを記録した.This report describes the results of meteorological observations at Syowa Station from February 1st, 2005 to January 31st, 2006, carried out by the Meteorological Observation Team of the 46th Japanese Antarctic Research Expedition (JARE-46). The observation methods, instruments and statistical methods used by the JARE-46 were almost the same as those used by the JARE-45 observation team. Remarkable weather phenomena observed during the period of JARE-46 are as follows.1) Annual mean relative humidity and cloud amount in 2005 at Syowa Station were 73 and 7.5, both records for Syowa Station. Annual mean wind speed and number of snow days were 7.2m/s and 228 days, both second highest values.2) There were 30 blizzards of which 6 were class A, 9 class B and, 15 class C, typical of a normal year.3) The amount of total ozone over Syowa Station became lower than or equal to 220m atm-cm from the end of August to mid-October. Monthly mean amount of total ozone in September was 173m atm-cm, which was the 4th lowest value in the historical record. On 4th October, the amount of total ozone was 136m atm-cm, which was the lowest value during JARE-46

ダイ40ジ ナンキョク チイキ カンソクタイ キショウ ブモン ホウコク 1999

これは,第40次南極地域観測隊気象部門が,1999年2月1日から2000年1月31日まで,南極昭和基地において気象観測を行った結果の報告である.気象観測の方法,測器,統計方法等は,第39次隊とほぼ同様である. 越冬期間中,特記される気象現象として,次のものがあげられる.1) 地上気象観測において,7月,12月,1月の気温,5月,10月,12月,1月の気圧が平年に比べ著しく低かった.10月5日に最低海面気圧932.1hPa(歴代2位)を記録した.ブリザードは,A級が4回,B級が10回,C級が11回の計25回あり,平年並みであった.2) オゾン全量観測において,昨年に引き続き大規模なオゾンホールを観測し,11月の月平均オゾン全量は過去最低を記録した.その後,12月中旬にオゾンホールは消滅したが,オゾン全量値の回復は過去一番遅かった.3) それに伴い,成層圏の昇温が遅れ,春季に下部成層圏で記録的に低い月平均気温を観測した.4) エアロゾルゾンデ観測において,春期南極上空で形成されるオゾンホールの重要要因となっていると思われる極成層圏雲(PSCs)の雲粒子の分布状況を観測した.5) 地上オゾン濃度観測において,観測を始めた第38次隊以来連続して地上オゾン濃度急減現象を観測した.This report presents the results of meteorological observations at Syowa Station from February 1, 1999 through January 31, 2000, carried out by the 40th Japanese Antarctic Research Expedition (JARE-40). The meteorological observation method, measuring instruments, means to compile statistics, and other aspects of the work were almost the same as those used by the 39th Japanese Antarctic Research Expedition. Remarkable weather phenomena during the wintering period are as follows: 1) In the surface weather observations, in July, December and January, the atmospheric temperature was significantly lower recorded compared to normal average years, and also the atmospheric pressure was significantly lower in May, October, December and January. The lowest sea level pressure, 932.1hPa was recorded during a severe blizzard on October 5 for the JARE-40 period (the 2nd lowest in history). There were 25-blizzards of which 4 were class A, 10 class B, and 11 class C, the same level as in a normal year.2) As a result of total ozone observation, the large-scale ozone hole was observed, as in the previous year, and the monthly average amount of total ozone in November recorded the lowest ever. Then, the ozone hole disappeared in mid-December, however, the recovery of the total amount of ozone was the slowest in years.3) Because, the temperature rise for the stratosphere was delayed, record-low monthly average temperature was observed in the lower stratosphere in springtime.4) By observing with an aerosol sonde, we observed cloud particles of polar stratospheric cloud (PSCs), which are thought to be the most important cause of ozone holes formed in the Antarctic lower stratosphere in springtime.5) In observation of surface ozone concentration, the rapid decrease of surface ozone concentration has been observed continuously, since JARE-38 started this observation

Results of the search for inspiraling compact star binaries from TAMA300's observation in 2000-2004

We analyze the data of TAMA300 detector to search for gravitational waves from inspiraling compact star binaries with masses of the component stars in the range 1-3Msolar. In this analysis, 2705 hours of data, taken during the years 2000-2004, are used for the event search. We combine the results of different observation runs, and obtained a single upper limit on the rate of the coalescence of compact binaries in our Galaxy of 20 per year at a 90% confidence level. In this upper limit, the effect of various systematic errors such like the uncertainty of the background estimation and the calibration of the detector's sensitivity are included.Comment: 8 pages, 4 Postscript figures, uses revtex4.sty The author list was correcte

Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses

We present data-analysis schemes and results of observations with the TAMA300 gravitational-wave detector, targeting burst signals from stellar-core collapse events. In analyses for burst gravitational waves, the detection and fake-reduction schemes are different from well-investigated ones for a chirp-wave analysis, because precise waveform templates are not available. We used an excess-power filter for the extraction of gravitational-wave candidates, and developed two methods for the reduction of fake events caused by non-stationary noises of the detector. These analysis schemes were applied to real data from the TAMA300 interferometric gravitational wave detector. As a result, fake events were reduced by a factor of about 1000 in the best cases. The resultant event candidates were interpreted from an astronomical viewpoint. We set an upper limit of 2.2x10^3 events/sec on the burst gravitational-wave event rate in our Galaxy with a confidence level of 90%. This work sets a milestone and prospects on the search for burst gravitational waves, by establishing an analysis scheme for the observation data from an interferometric gravitational wave detector