The joint research group of Nagoya University and Japan Agency for Marine-Earth Science and Technology has stated that the Siberian tundra (permafrost) is becoming dry, and one of the reasons is the increase in water evaporation from the ground surface due to the rapid rise in temperature in summer. Announced the research result that it is in.It was published in the online version of the English academic journal "International Journal of Remote Sensing".This is the first report to clarify the fluctuation of inland water storage in the tundra area using the gravity observation data by artificial satellites, and it supports that the influence of global warming is widespread around the Arctic.
In global warming, the temperature does not rise uniformly in all regions of the earth, and the circulation pattern of heat and moisture existing in the atmosphere, land, and sea changes in a complicated manner due to the so-called "greenhouse effect", and as a result. It will greatly change the climate around the world.In particular, the Arctic region is strongly affected by such climate change, so it is the subject of research by researchers from various countries.
The joint research group will use data from the gravity observation satellite "GRACE" jointly launched by Germany and the United States to include data in the soil, wetlands and lakes of the Arctic Ocean coast and Siberian permafrost during the 2002 years from 13. The amount of water (landwater storage) was analyzed.As a result, it was found that the amount of inland water stored in this area has decreased by about 2002 mm per year since 1.It was also found that the summer temperature in this region from June to August increased by an average of 6 ° C per year.The group claims that this rapid rise in temperature evaporates land moisture and promotes drying.It was also pointed out that this land water is cryopreserved in the soil in winter and melts in spring, which affects the river flow in the following year.
In the future, the research group will analyze the aridity of the tundra area in more detail, and also evaluate the effects of wetlands, lakes and vegetation.In addition, further research and technological development will be carried out in order to apply satellite gravity observations to climate change research such as methane emission estimation.