Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2017JD028260 |
Improved Simulation of Frozen-Thawing Process in Land Surface Model (CLM4.5) | |
Yang, Kai; Wang, Chenghai; Li, Shiyue | |
2018-12-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:23页码:13238-13258 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Soil freezing-thawing cycle is a hallmark feature of the land surface over cold regions. Variations in soil moisture and temperature during frozen-thawing (FT) process are important for water and energy exchange between land and atmosphere. Results of regional simulations by Community Land Model version 4.5 (CLM4.5) over the Tibetan Plateau show that error of daily soil temperature is within 3 degrees C and error of daily soil moisture is with 0.10mm(3)/mm(3) in FT process, averaged at 10 sites of whole Tibetan Plateau. Single-point simulations show that model biases partly attribute to uncertainties of initial condition and soil category data; excluding impacts of model setting, large biases of soil moisture still exist during soil thawing, and CLM4.5 fails to simulate the diurnal cycle of soil moisture in this period. Modifications of the FT parameterizations in CLM4.5 are proposed, which include (1) use of virtual temperature (T-v) instead of constant freezing point to determine occurring of phase change, (2) introduction of phase change efficiency (epsilon) to optimize variation rate of soil temperature and moisture in FT process, and (3) consideration of inferred impacts of phase change on soil heat conduction. Single-point and global simulations show that compared to original parameterizations in CLM4.5, these modifications can reproduce the features of daily and diurnal variations in soil moisture and make simulation in FT process closer to the observations. |
英文关键词 | frozen-thawing process soil temperature and moisture modified parameterizations simulation improvements |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000455285500012 |
WOS关键词 | SOIL-MOISTURE ; NUMERICAL-SOLUTION ; FREEZE ; SNOW ; PARAMETERIZATION ; PRECIPITATION ; PERMAFROST ; PLATFORM ; RUNOFF ; HEAT |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32745 |
专题 | 气候变化 |
作者单位 | Lanzhou Univ, Coll Atmospher Sci, Key Lab Arid Climate Change & Disaster Reduct Gan, Lanzhou, Gansu, Peoples R China |
推荐引用方式 GB/T 7714 | Yang, Kai,Wang, Chenghai,Li, Shiyue. Improved Simulation of Frozen-Thawing Process in Land Surface Model (CLM4.5)[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(23):13238-13258. |
APA | Yang, Kai,Wang, Chenghai,&Li, Shiyue.(2018).Improved Simulation of Frozen-Thawing Process in Land Surface Model (CLM4.5).JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(23),13238-13258. |
MLA | Yang, Kai,et al."Improved Simulation of Frozen-Thawing Process in Land Surface Model (CLM4.5)".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.23(2018):13238-13258. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论