Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jhydrol.2012.06.008 |
Seasonal snow cover in the Qilian Mountains of Northwest China: Its dependence on oasis seasonal evolution and lowland production of water vapour | |
Bourque, Charles P. -A.1,2; Mir, Matin A.1 | |
通讯作者 | Bourque, Charles P. -A. |
来源期刊 | JOURNAL OF HYDROLOGY
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ISSN | 0022-1694 |
出版年 | 2012 |
卷号 | 454页码:141-151 |
英文摘要 | Back and forth exchange of water vapour and liquid water from oases at the base of the Qilian Mountains (NW China) and from the Qilian Mountains to oases as surface and shallow subsurface flow has been previously shown by model simulation to be a potentially important mechanism in the long-term stabilisation of oases in westcentral Gansu (Bourque and Hassan, 2009). In a subsequent re-examination of oasis self-support, we use monthly snow-cover patterns in the Qilian Mountains to determine the extent oasis vegetation and evapotranspiration in the low-lying portions of the upper and middle Shiyang and Hei River watersheds control snowfall dynamics in the Qilian Mountains. Monthly snow-cover area (SCA) in the watersheds is simulated with a spatially-distributed model designed to address differences in (i) topography along the prevailing wind direction, (ii) water-vapour production and transport, (iii) in-mountain production of precipitation, and (iv) precipitation phase changes. Seasonal variations in oasis vegetation, surface temperature (for model input), and SCA (for model validation) are described as separate timeseries of monthly composites of enhanced vegetation index, land surface temperature, and normalised difference snow index generated from MODIS optical reflectance and thermal emission data. Comparisons of modelled and snow-index-based estimates of SCA in the Shiyang and Hei River watersheds for the hydrological year, from August 2004 to July 2005, provide nearly similar spatiotemporal patterns; overlap between SCA’s exceeds 60% for most months. An exception to this is in mid-summer of 2004, where overlap between SCA’s is <30%. Agreement between monthly SCA’s reinforces the importance of oasis-vegetation dynamics and mass transfer of water vapour to the atmosphere in guiding seasonal formation of precipitation and snow-cover dynamics in the Qilian Mountains. (C) 2012 Elsevier B.V. All rights reserved. |
英文关键词 | Evapotranspiration Oasis-mountain ecosystems Oasis self-support Precipitation Snow cover area Vegetation dynamics |
类型 | Article |
语种 | 英语 |
国家 | Canada ; Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000307154000013 |
WOS关键词 | SHIYANG RIVER-BASIN ; WEST-CENTRAL GANSU ; ACCURACY ASSESSMENT ; SPRING WHEAT ; HEIHE RIVER ; GOBI DESERT ; MODIS ; PRECIPITATION ; GROUNDWATER ; VEGETATION |
WOS类目 | Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources |
WOS研究方向 | Engineering ; Geology ; Water Resources |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/173682 |
作者单位 | 1.Univ New Brunswick, Fac Forestry & Environm Management, Fredericton, NB E3B 5A3, Canada; 2.Gansu Prov Meteorol Bur, Lanzhou Reg Climate Ctr, Lanzhou 730020, Gansu, Peoples R China |
推荐引用方式 GB/T 7714 | Bourque, Charles P. -A.,Mir, Matin A.. Seasonal snow cover in the Qilian Mountains of Northwest China: Its dependence on oasis seasonal evolution and lowland production of water vapour[J],2012,454:141-151. |
APA | Bourque, Charles P. -A.,&Mir, Matin A..(2012).Seasonal snow cover in the Qilian Mountains of Northwest China: Its dependence on oasis seasonal evolution and lowland production of water vapour.JOURNAL OF HYDROLOGY,454,141-151. |
MLA | Bourque, Charles P. -A.,et al."Seasonal snow cover in the Qilian Mountains of Northwest China: Its dependence on oasis seasonal evolution and lowland production of water vapour".JOURNAL OF HYDROLOGY 454(2012):141-151. |
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