Thawing and freezing processes of active layer in Wudaoliang region of Tibetan Plateau | |
Zhao, L; Cheng, GD; Li, SX; Zhao, XM; Wang, SL | |
刊名 | CHINESE SCIENCE BULLETIN |
2000-12-01 | |
卷号 | 45期号:23页码:2181-2187 |
关键词 | active layer freezing process water and heat couple |
ISSN号 | 1001-6538 |
通讯作者 | Zhao, L() |
英文摘要 | The interaction between permafrost and atmosphere is accomplished through transfer of heat and moisture in the overlay active layer. Thus, the research on the thermal and hydrodynamics of active layer during the thawing and freezing processes was considered a key to revealing the heat and moisture exchanges between permafrost and atmosphere. The monitoring and research on active layer were conducted because permafrost occupies about two thirds of the total area of the Tibetan Plateau. Based on the analysis of the ground temperature data and soil moisture data of monitoring near the Wudaoliang region of the Tibetan Plateau, the thawing and freezing processes of active layer were divided into four stages, i.e. summer thawing stage (ST), autumn freezing stage (AF), winter cooling stage (WC) and spring warming stage (SW). Coupled heat and water flow is much more complicated in ST and AF, and more amount of water is migrating in these two stages. Heat is transferred mainly via conductive heat flow in the other two stages, and less water migrated. Four water migration and coupled heat flow processes were addressed for the thawing and freezing stages, which are water infiltration driven by gravity, moisture advection and distillation driven by temperature and osmotic gradients, water migration driven by capillarity and unfrozen water migration driven by temperature gradient. The water content near the permafrost table tends to increase after one thawing and freezing cycle, which is the main reason for the development of thick ground ice layer near permafrost table. |
收录类别 | SCI |
WOS关键词 | NEAR-SURFACE PERMAFROST ; NORTHERN ALASKA ; COASTAL-PLAIN ; TEMPERATURES ; USA |
WOS研究方向 | Science & Technology - Other Topics |
WOS类目 | Multidisciplinary Sciences |
语种 | 英语 |
出版者 | SCIENCE PRESS |
WOS记录号 | WOS:000166396600014 |
内容类型 | 期刊论文 |
URI标识 | http://www.corc.org.cn/handle/1471x/2556667 |
专题 | 寒区旱区环境与工程研究所 |
通讯作者 | Zhao, L |
作者单位 | Chinese Acad Sci, Inst Cold & Arid Reg Environm & Engn Res, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China |
推荐引用方式 GB/T 7714 | Zhao, L,Cheng, GD,Li, SX,et al. Thawing and freezing processes of active layer in Wudaoliang region of Tibetan Plateau[J]. CHINESE SCIENCE BULLETIN,2000,45(23):2181-2187. |
APA | Zhao, L,Cheng, GD,Li, SX,Zhao, XM,&Wang, SL.(2000).Thawing and freezing processes of active layer in Wudaoliang region of Tibetan Plateau.CHINESE SCIENCE BULLETIN,45(23),2181-2187. |
MLA | Zhao, L,et al."Thawing and freezing processes of active layer in Wudaoliang region of Tibetan Plateau".CHINESE SCIENCE BULLETIN 45.23(2000):2181-2187. |
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