This study presents thermokarst lake changes at seven different sites in the continuous and isolated permafrost zones in Mongolia. Lakes larger than 0.1 ha were analyzed using Corona KH-4, KH-4A and KH-4B (1962-1968),...This study presents thermokarst lake changes at seven different sites in the continuous and isolated permafrost zones in Mongolia. Lakes larger than 0.1 ha were analyzed using Corona KH-4, KH-4A and KH-4B (1962-1968), Landsat ETM + (1999-2001), and ALOS/AVNIR-2 (2006-2007) satellite imagery. Between 1962 and 2007, the total number and area of lakes increased by +21% (347 to 420), and +7% (3680 ha to 3936 ha) in the continuous permafrost zone, respectively. These changes correspond to the appearance of 85 new lakes (166 ha) during the last 45 years. In contrast, lakes in the isolated permafrost zone have decreased by –42% (118 to 68) in number and –12% (422 ha to 371 ha) in area from 1962 to 2007. The changes in lake area and number are likely attributed to shifts in climate regimes and local permafrost conditions. Since 1962, the mean annual air temperature and potential evapotranspiration have increased significantly in the northern continuous permafrost zone compared to the southern isolated permafrost zone. Due to ongoing atmospheric warming without any significant trend in annual precipitation, patches of ice-rich subsurface have thawed, and the number and area of lakes have accordingly developed in the continuous permafrost zone. Shrinking of thermokarst lakes in the isolated permafrost zone may be due to disappearing permafrost, deepening of the active layer, and increased water loss through surface evaporation and subsurface drainage.展开更多
To clarify the interrelationship among blood pressure (BP), intraocular pressure (IOP), and life-style related factors, a cross-sectional study was conducted. This epidemiological study analyzed health examination dat...To clarify the interrelationship among blood pressure (BP), intraocular pressure (IOP), and life-style related factors, a cross-sectional study was conducted. This epidemiological study analyzed health examination data obtained between 2001 and 2004 from 1113 Japanese individuals, ranging in age 28 to 79 years, who had not undergone any ocular surgery or medical treatment for hypertension, ocular hypertension, and glaucoma. The association of systolic and diastolic BP (SBP and DBP), and life-style related factors such as body mass index (BMI), drinking, smoking, and exercise habits with IOP were evaluated by multiple regression analyses and analyses of covariance. The results of this study showed that SBP, DBP, and BMI had a significantly positive association with IOP in both sexes. In men, the number of cigarette smoking per day was also positively related to IOP展开更多
文摘This study presents thermokarst lake changes at seven different sites in the continuous and isolated permafrost zones in Mongolia. Lakes larger than 0.1 ha were analyzed using Corona KH-4, KH-4A and KH-4B (1962-1968), Landsat ETM + (1999-2001), and ALOS/AVNIR-2 (2006-2007) satellite imagery. Between 1962 and 2007, the total number and area of lakes increased by +21% (347 to 420), and +7% (3680 ha to 3936 ha) in the continuous permafrost zone, respectively. These changes correspond to the appearance of 85 new lakes (166 ha) during the last 45 years. In contrast, lakes in the isolated permafrost zone have decreased by –42% (118 to 68) in number and –12% (422 ha to 371 ha) in area from 1962 to 2007. The changes in lake area and number are likely attributed to shifts in climate regimes and local permafrost conditions. Since 1962, the mean annual air temperature and potential evapotranspiration have increased significantly in the northern continuous permafrost zone compared to the southern isolated permafrost zone. Due to ongoing atmospheric warming without any significant trend in annual precipitation, patches of ice-rich subsurface have thawed, and the number and area of lakes have accordingly developed in the continuous permafrost zone. Shrinking of thermokarst lakes in the isolated permafrost zone may be due to disappearing permafrost, deepening of the active layer, and increased water loss through surface evaporation and subsurface drainage.
文摘To clarify the interrelationship among blood pressure (BP), intraocular pressure (IOP), and life-style related factors, a cross-sectional study was conducted. This epidemiological study analyzed health examination data obtained between 2001 and 2004 from 1113 Japanese individuals, ranging in age 28 to 79 years, who had not undergone any ocular surgery or medical treatment for hypertension, ocular hypertension, and glaucoma. The association of systolic and diastolic BP (SBP and DBP), and life-style related factors such as body mass index (BMI), drinking, smoking, and exercise habits with IOP were evaluated by multiple regression analyses and analyses of covariance. The results of this study showed that SBP, DBP, and BMI had a significantly positive association with IOP in both sexes. In men, the number of cigarette smoking per day was also positively related to IOP
