BCC_AVIM陆面过程模式冻融过程参数化的改进与检验  

Improvement and Verification of Freezing-Thawing Process Parameterization of BCC_AVIM Land Surface Process Model

作　　者：胥朋飞 吕世华 马翠丽[3] 徐悦 罗江鑫 黄一鸣 寇宇 XU Pengfei;LÜShihua;MA Cuili;XU Yue;LUO Jiangxin;HUANG Yiming;KOU Yu(Sichuan Provincial Key Laboratory of Plateau Atmosphere and Environment,School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,Sichuan,China;Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions,Northwest Institute of Eco-Resources and Environment,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;Baotou Meteorological Bureau,Baotou 014030,Inner-Mongolia,China;Hengshan Meteorological Bureau,Hengshan 421300,Hunan,China;Tumen Meteorological Bureau,Tumen 133100,Jilin,China)

机构地区：[1]成都信息工程大学大气科学学院高原大气与环境四川省重点实验室,四川成都610225 [2]中国科学院西北生态资源环境研究院寒旱区陆面过程与气候变化重点实验室,甘肃兰州730000 [3]内蒙古包头市气象局,内蒙古包头014030 [4]湖南衡山县气象局,湖南衡山421300 [5]吉林图们市气象局,吉林图们133100

出　　处：《高原气象》2022年第2期349-362,共14页Plateau Meteorology

基　　金：第二次青藏高原综合科学考察研究项目(2019QZKK0103);国家自然科学基金项目(41975007,41905008);中国气象局创新发展专项(CXFZ2021Z005)。

摘　　要：考虑冻融过程对陆气相互作用的重要性,参考国内外学者对于冻融过程的参数化方案研究,对BCC_AVIM陆面过程模式的冻融过程参数化方案进行了改进与检验。改进的内容主要包括:(1)加入了过冷水概念,改进土壤冻结判断条件与含冰量更新标准;(2)加入平衡温度概念代替原方案中恒定的冻结温度;(3)在导水率的参数化方案之中加入不可渗透分数。用改进前后方案分别模拟玛曲站2018-2019年,2019-2020年两次冻融过程。发现改进后的方案在冻融过程中相比原方案:(1)增大了冻结状态温度模拟值、振幅减小、变化趋势更加接近实测;(2)增大了冻结状态中含水量的模拟值,变化趋势与实测相关性更好;(3)土壤中冰的产生日期延后,冰的融解日期提前,最大含冰量模拟减小;(4)冻融过程各阶段的转变日期模拟更接近实测;(5)新方案对于强冻融年份的模拟提升效果更优于弱冻融年份。In this paper,considering the importance of the freezing-thawing process to the land-atmosphere interaction,and referring to the research and works on the parameterization scheme of the freeze-thaw process by domestic and foreign scholars,the parameterization scheme of the freezing-thawing process of the BCC_AVIM land surface process model is improved and vitrificated. The improvements mainly include:(1)adding the concept of supercooled water,improving soil freezing judgment conditions and updating standards for ice content;(2)adding the concept of equilibrium temperature to replace the constant freezing temperature in the original scheme;(3)Adding the impermeable fraction in hydraulic conductivity’s parameterization scheme. The modified and original schemes were used to simulate the two freeze-thaw processes of Maqu Station in 2018-2019and 2019-2020 respectively. Comparing with the original scheme during the freezing and thawing process,it is found that modified scheme(1)increase the simulation of temperature in the frozen state,also reduce the temperature’s amplitude,and change the trend closer to the measurement data;(2)increase the simulation of water content in the frozen state,and the trend of water content of modified scheme has a better correlation with the measurement data;(3)delay the date of ice generation in the soil,advance the melting date of ice,and decrease the simulation of maximum ice content;(4)The simulation of the transition date at each stage of the freeze-thaw process is closer to the actual measurement;(5)The new scheme has a better simulation improvement effect for strong freeze-thaw years than weak freeze-thaw years.

关 键 词：冻融过程 BCC_AVIM陆面过程模式 参数化方案 土壤水热 

分 类 号：P437[天文地球—大气科学及气象学]