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1961—2019年三江源地区季节冻土冻融状态时空变化及影响因素研究
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Study on spatiotemporal changes of the freeze-thaw status of seasonally frozen ground and influencing factors in the Three Rivers Source Region from 1961 to 2019
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图5. 1961—2019年三江源地区季节冻土冻结开始日期(a)、完全融化日期(b)及冻融期(c)时间序列(红色线条为1961—1989年该地区季节冻土冻融状态指标变化趋势拟合线,蓝色线条为1989—2019年该地区季节冻土冻融状态指标变化趋势拟合线) |
Fig. 5. The long-term trend of the first date of soil freeze (a), the last date of soil thaw (b) and freeze-thaw duration (c) in the Three Rivers Source Region from 1961 to 2019 (Red line indicate trend over time of each freeze-thaw state variable on the Three Rivers Source Region from 1961 to 1989 and blue line indicate 1989 to 2019) |
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