Study on Variations of energy-water cycles over cold regions

在欧亚大陆东部的苔原、平原泰加、山地泰加、蒙古牧场和青藏高原观测了热量和水(汽)的输送过程。对一维热量和水汽通量的连续测量表明，由于纬向辐射强迫、季风活动和植物物候活动，热通量和水汽通量有明显的季节变化。通过对大气边界层的探空和空中观测，得到了从局地(斑块)到区域尺度的热通量和水汽通量的聚集过程。利用西伯利亚和西藏多年冻土区H2O的稳定同位素比值，推导了多年冻土活跃层和大气边界层的水分传输机制。在勒拿河流域进行了区域水文模拟。该模型包括一维热量和水汽传输、径流过程和河网水分传输的描述方案。

Transfer processes of heat and water (vapor) were observed on tundra, plain taiga, mountain taiga, Mongolian grass field, and Tibetan Plateau in eastern Eurasian Continent. Continuous measurement of one-dimensional heat and water vapor fluxes revealed clear seasonal variation due to latitudinal radiation forcing, Monsoon activity, and plant phonological activity. Observations of atmospheric boundary layer using radiosonde and airborne were carried out to derive aggregation processes of heat and water vapor fluxes from local (patch) to regional scales. Water transfer mechanisms in active layer of permafrost and in the atmospheric boundary layer were also derived using stable isotopic ratio of H_2O in Siberian and Tibetan permafrost regions. Regional hydrological modeling was done in the Lena river basin. This model included schemes representing one-dimensional heat and water vapor transfer, runoff process, and water transfer in river channel network.