Study on Variations of energy-water cycles over cold regions

研究了欧亚大陆东部冻土带、平原针叶林、山地针叶林、蒙古草地和青藏高原的热（气）传递过程。一维热通量和水汽通量的连续测量显示，由于纬向辐射强迫、季风活动和植物音系活动的影响，季节变化明显。利用探空和机载对大气边界层进行观测，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H_2O稳定同位素比值，推导了多年冻土区活动层和大气边界层的水分输送机制。对勒拿河流域进行了区域水文模拟。该模型包括一维热、水汽传输方案、径流过程方案和河道网络中水传输方案。

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.