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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10. 1961—2019年三江源地区季节冻土最大冻结深度(a)、冻结开始日期(b)、完全融化日期(c)、冻融期(d)影响因子贡献率(ALT为海拔,Lat为纬度,Lon为经度,SD为雪深,PRE为降水,MAAT为年平均气温,MAGST为年平均地表温度,TI为融化指数,FI为冻结指数;虚线表示累积贡献率达到80%) |
Fig. 10. Contribution rate of each influence factor to maximum freeze depth (a), the first date of soil freeze (b), the last date of soil thaw (c) and freeze-thaw duration (d) of seasonally frozen soil in the Three Rivers Source Region from 1961 to 2019 (ALT is altitude, Lat is latitude, Lon is longitude, SD is snow depth, PRE is precipitation, MAAT is mean annual air temperature, MAGST is mean annual ground surface temperature, TI is thawing index, Fi is freezing index, and dotted line indicate cumulative contribution reached 80%) |
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