Interdecadal and interannuat variations of saline-alkali land area in Qian＇an County, Jilin Province, China were comprehensively analyzed in this paper by means of satellite remote sensing interpretation, field flux ...Interdecadal and interannuat variations of saline-alkali land area in Qian＇an County, Jilin Province, China were comprehensively analyzed in this paper by means of satellite remote sensing interpretation, field flux observations and regional climate diagnosis. The results show that on the interannual scale, the impact of climate factors accounts for 71.6% of the total variation of the saline-alkali land area, and that of human activities accounts for 28.4%. Therefore the impact of climate factors is obviously greater than that of human activities. On the interdecadal scale, the impact of climate factors on the increase of the saline-alkali land area accounts for 43.2%, and that of human activities accounts for 56.8%. The impact of human activities on the variation of saline-alkali land area is very clear on the interdecadal scale, and the negative impact of human activities on the environment should not be negligible. Besides, changes in the area of heavy saline-alkali land have some indication for development of saline-alkali land in Qian＇an County.展开更多
通过分析中国北方干旱/半干旱区气候和水热循环及其分量对不同增温阈值和路径的响应,加深对区域尺度气候变化的理解,为应对和缓解未来气候变暖提供参考思路。本文利用NESM(Nanjing University Information Science and Technology Earth...通过分析中国北方干旱/半干旱区气候和水热循环及其分量对不同增温阈值和路径的响应,加深对区域尺度气候变化的理解,为应对和缓解未来气候变暖提供参考思路。本文利用NESM(Nanjing University Information Science and Technology Earth System Model)大尺度模式驱动WRF(Weather Research and Forecasting model)区域模式,模拟预估中国对未来增暖1.5/2℃时不同排放路径下区域气候的响应。对中国北方干旱/半干旱区气候场和水热循环未来变化进行定量评估表明,稳定增暖1.5℃情景下,干旱/半干旱区内温度和降水的增加幅度由西向东递减,水分收支分量受到降水影响;净辐射将在整个区域内增加1%~3%,并更多以潜热通量的形式向大气输送热量。增暖达到2℃时干旱区内温升超过2.6℃,降水和水分收支分量增多,净辐射和感热通量将在大部分地区相比增暖1.5℃时减少。对比稳定增暖2℃情景,瞬变增暖2℃下温度的升温幅度在大部分区域减小0.1~0.3℃,瞬变增暖路径下净辐射的减弱可能是导致温度升温幅度降低的原因之一。夏季可用水(降水减去蒸发)对增暖路径的敏感响应导致不同区域内干旱的可能变化存在差异。相比瞬变增暖路径,稳定增暖2℃下干旱及半湿润区干旱缓解有所减缓,而半干旱区内干旱状态进一步缓解。展开更多
目前我国尚无连续管速度管柱优化设计软件,而国外相关软件的计算模型过于陈旧,操作较为困难,功能不满足现场需求。鉴于此,以Visual Studio 2015为开发平台,结合国内气田现场的作业条件和前期计算模型的相关研究,自主开发出连续管速度管...目前我国尚无连续管速度管柱优化设计软件,而国外相关软件的计算模型过于陈旧,操作较为困难,功能不满足现场需求。鉴于此,以Visual Studio 2015为开发平台,结合国内气田现场的作业条件和前期计算模型的相关研究,自主开发出连续管速度管柱优化设计软件,并验证了其实用性。软件分为输入和输出2大功能模块,采用菜单框架结构,充分考虑气田现场技术人员需求,力求软件界面简洁,实际操作方便,功能模块齐全。依据所得参数,软件能对连续管速度管柱的下入时机、尺寸及全周期施工方案提供推荐。实例验证结果表明该软件能较好地实现预定功能。研究成果对气田现场的连续管速度管柱施工作业具有一定的指导意义。展开更多
基金Under the auspices of National Key Technology R&D Program of China (No. 2007BAC29B01)Major State Basic Research Development Program of China (973 Program) (No. 2006CB400500)+1 种基金National Natural Science Foundation of China (No.40575047, 40705036, 40975055)Key Program of Jilin Provincial Science & Technology Department (No. 20020417)
文摘Interdecadal and interannuat variations of saline-alkali land area in Qian＇an County, Jilin Province, China were comprehensively analyzed in this paper by means of satellite remote sensing interpretation, field flux observations and regional climate diagnosis. The results show that on the interannual scale, the impact of climate factors accounts for 71.6% of the total variation of the saline-alkali land area, and that of human activities accounts for 28.4%. Therefore the impact of climate factors is obviously greater than that of human activities. On the interdecadal scale, the impact of climate factors on the increase of the saline-alkali land area accounts for 43.2%, and that of human activities accounts for 56.8%. The impact of human activities on the variation of saline-alkali land area is very clear on the interdecadal scale, and the negative impact of human activities on the environment should not be negligible. Besides, changes in the area of heavy saline-alkali land have some indication for development of saline-alkali land in Qian＇an County.
文摘通过分析中国北方干旱/半干旱区气候和水热循环及其分量对不同增温阈值和路径的响应,加深对区域尺度气候变化的理解,为应对和缓解未来气候变暖提供参考思路。本文利用NESM(Nanjing University Information Science and Technology Earth System Model)大尺度模式驱动WRF(Weather Research and Forecasting model)区域模式,模拟预估中国对未来增暖1.5/2℃时不同排放路径下区域气候的响应。对中国北方干旱/半干旱区气候场和水热循环未来变化进行定量评估表明,稳定增暖1.5℃情景下,干旱/半干旱区内温度和降水的增加幅度由西向东递减,水分收支分量受到降水影响;净辐射将在整个区域内增加1%~3%,并更多以潜热通量的形式向大气输送热量。增暖达到2℃时干旱区内温升超过2.6℃,降水和水分收支分量增多,净辐射和感热通量将在大部分地区相比增暖1.5℃时减少。对比稳定增暖2℃情景,瞬变增暖2℃下温度的升温幅度在大部分区域减小0.1~0.3℃,瞬变增暖路径下净辐射的减弱可能是导致温度升温幅度降低的原因之一。夏季可用水(降水减去蒸发)对增暖路径的敏感响应导致不同区域内干旱的可能变化存在差异。相比瞬变增暖路径,稳定增暖2℃下干旱及半湿润区干旱缓解有所减缓,而半干旱区内干旱状态进一步缓解。
文摘目前我国尚无连续管速度管柱优化设计软件,而国外相关软件的计算模型过于陈旧,操作较为困难,功能不满足现场需求。鉴于此,以Visual Studio 2015为开发平台,结合国内气田现场的作业条件和前期计算模型的相关研究,自主开发出连续管速度管柱优化设计软件,并验证了其实用性。软件分为输入和输出2大功能模块,采用菜单框架结构,充分考虑气田现场技术人员需求,力求软件界面简洁,实际操作方便,功能模块齐全。依据所得参数,软件能对连续管速度管柱的下入时机、尺寸及全周期施工方案提供推荐。实例验证结果表明该软件能较好地实现预定功能。研究成果对气田现场的连续管速度管柱施工作业具有一定的指导意义。
