Seasonal snow cover is a key global climate and hydrological system component drawing considerable attention due to glob-al warming conditions.However,the spatiotemporal snow cover patterns are challenging in western ...Seasonal snow cover is a key global climate and hydrological system component drawing considerable attention due to glob-al warming conditions.However,the spatiotemporal snow cover patterns are challenging in western Jilin,China due to natural condi-tions and sparse observation.Hence,this study investigated the spatiotemporal patterns of snow cover using fine-resolution passive mi-crowave(PMW)snow depth(SD)data from 1987 to 2018,and revealed the potential influence of climate factors on SD variations.The results indicated that the interannual range of SD was between 2.90 cm and 9.60 cm during the snowy winter seasons and the annual mean SD showed a slightly increasing trend(P>0.05)at a rate of 0.009 cm/yr.In snowmelt periods,the snow cover contributed to an increase in volumetric soil water,and the change in SD was significantly affected by air temperature.The correlation between SD and air temperature was negative,while the correlation between SD and precipitation was positive during December and March.In March,the correlation coefficient exceeded 0.5 in Zhenlai,Da’an,Qianan,and Qianguo counties.However,the SD and precipitation were neg-atively correlated over western Jilin in October,and several subregions presented a negative correlation between SD and precipitation in November and April.展开更多
文中分析了车载雷达液冷源设计中存在非标定制、种类多样的问题,根据液冷源的产品特点,重点针对高度受限的液冷源开展模块化设计方法研究。研制了一种基于R410a制冷剂的30 k W标准制冷模块,并开展了制冷模块的性能测试、环境适应性测试...文中分析了车载雷达液冷源设计中存在非标定制、种类多样的问题,根据液冷源的产品特点,重点针对高度受限的液冷源开展模块化设计方法研究。研制了一种基于R410a制冷剂的30 k W标准制冷模块,并开展了制冷模块的性能测试、环境适应性测试和集成验证。该标准制冷模块可通用、可互换、数量可编辑、可扩展,适配于不同规格的液冷源,可大大缩短液冷源的研制周期,降低研制和维护成本,为液冷源的标准化和系列化设计提供借鉴。展开更多
基金Under the auspices of the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA28110502)Science and Technology Development Plan Project of Jilin Province(No.20220202035NC)+1 种基金National Natural Science Foundation of China(No.41871248)Changchun Science and Technology Development Plan Project(No.21ZY12)。
文摘Seasonal snow cover is a key global climate and hydrological system component drawing considerable attention due to glob-al warming conditions.However,the spatiotemporal snow cover patterns are challenging in western Jilin,China due to natural condi-tions and sparse observation.Hence,this study investigated the spatiotemporal patterns of snow cover using fine-resolution passive mi-crowave(PMW)snow depth(SD)data from 1987 to 2018,and revealed the potential influence of climate factors on SD variations.The results indicated that the interannual range of SD was between 2.90 cm and 9.60 cm during the snowy winter seasons and the annual mean SD showed a slightly increasing trend(P>0.05)at a rate of 0.009 cm/yr.In snowmelt periods,the snow cover contributed to an increase in volumetric soil water,and the change in SD was significantly affected by air temperature.The correlation between SD and air temperature was negative,while the correlation between SD and precipitation was positive during December and March.In March,the correlation coefficient exceeded 0.5 in Zhenlai,Da’an,Qianan,and Qianguo counties.However,the SD and precipitation were neg-atively correlated over western Jilin in October,and several subregions presented a negative correlation between SD and precipitation in November and April.
文摘文中分析了车载雷达液冷源设计中存在非标定制、种类多样的问题,根据液冷源的产品特点,重点针对高度受限的液冷源开展模块化设计方法研究。研制了一种基于R410a制冷剂的30 k W标准制冷模块,并开展了制冷模块的性能测试、环境适应性测试和集成验证。该标准制冷模块可通用、可互换、数量可编辑、可扩展,适配于不同规格的液冷源,可大大缩短液冷源的研制周期,降低研制和维护成本,为液冷源的标准化和系列化设计提供借鉴。