Hydrological Variability in the Arid Region of Northwest China from 2002 to 2013
The arid region of Northwest China (ANC) has a distinct and fragile inland water cycle. This study examined the hydrological variations in ANC and its three subregions from August 2002 to December 2013 by integrating terrestrial water storage (TWS) anomaly data derived from the Gravity Recovery and...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in Meteorology |
| Online Access: | http://dx.doi.org/10.1155/2018/1502472 |
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| author | Yanping Cao Zhuotong Nan Guodong Cheng Ling Zhang |
| author_facet | Yanping Cao Zhuotong Nan Guodong Cheng Ling Zhang |
| author_sort | Yanping Cao |
| collection | DOAJ |
| description | The arid region of Northwest China (ANC) has a distinct and fragile inland water cycle. This study examined the hydrological variations in ANC and its three subregions from August 2002 to December 2013 by integrating terrestrial water storage (TWS) anomaly data derived from the Gravity Recovery and Climate Experiment (GRACE) satellite, soil moisture data modeled by the Global Land Data Assimilation System, and passive microwave snow water equivalent data. The results show that the TWS in ANC increased at a rate of 1.7 mm/a over the past decade, which consisted of an increasing trend of precipitation (0.12 mm/a). Spatially, in the northern ANC, TWS exhibited a significant decreasing trend of −3.64 mm/a (p<0.05) as a result of reduced rainfall, increased glacial meltwater draining away from the mountains, and intensified human activities. The TWS in southern and eastern ANC increased at a rate of 2.14 (p=0.10) and 1.63 (p<0.01) mm/a, respectively. In addition to increasing precipitation and temperature, decreasing potential evapotranspiration in Southern Xinjiang and expanding human activities in Hexi-Alashan together led to an overall increase in TWS. Increased glacier meltwater and permafrost degradation in response to climate warming may also affect the regional TWS balance. The variations in soil moisture, groundwater, and surface water accounted for the majority of the TWS anomalies in southern and eastern ANC. The proposed remote sensing approach combining multiple data sources proved applicable and useful to understand the spatiotemporal characteristics of hydrological variability in a large area of arid land without the need for field observations. |
| format | Article |
| id | doaj-art-a2c3e725b95d4d3ca5a6e43ac5ba74cd |
| institution | Kabale University |
| issn | 1687-9309 1687-9317 |
| language | English |
| publishDate | 2018-01-01 |
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| series | Advances in Meteorology |
| spelling | doaj-art-a2c3e725b95d4d3ca5a6e43ac5ba74cd2025-08-20T03:38:19ZengWileyAdvances in Meteorology1687-93091687-93172018-01-01201810.1155/2018/15024721502472Hydrological Variability in the Arid Region of Northwest China from 2002 to 2013Yanping Cao0Zhuotong Nan1Guodong Cheng2Ling Zhang3College of Environment and Planning, Henan University, Kaifeng 475004, ChinaKey Laboratory of Virtual Geographic Environment of Ministry of Education, Nanjing Normal University, Nanjing 210023, ChinaNorthwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, ChinaNorthwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, ChinaThe arid region of Northwest China (ANC) has a distinct and fragile inland water cycle. This study examined the hydrological variations in ANC and its three subregions from August 2002 to December 2013 by integrating terrestrial water storage (TWS) anomaly data derived from the Gravity Recovery and Climate Experiment (GRACE) satellite, soil moisture data modeled by the Global Land Data Assimilation System, and passive microwave snow water equivalent data. The results show that the TWS in ANC increased at a rate of 1.7 mm/a over the past decade, which consisted of an increasing trend of precipitation (0.12 mm/a). Spatially, in the northern ANC, TWS exhibited a significant decreasing trend of −3.64 mm/a (p<0.05) as a result of reduced rainfall, increased glacial meltwater draining away from the mountains, and intensified human activities. The TWS in southern and eastern ANC increased at a rate of 2.14 (p=0.10) and 1.63 (p<0.01) mm/a, respectively. In addition to increasing precipitation and temperature, decreasing potential evapotranspiration in Southern Xinjiang and expanding human activities in Hexi-Alashan together led to an overall increase in TWS. Increased glacier meltwater and permafrost degradation in response to climate warming may also affect the regional TWS balance. The variations in soil moisture, groundwater, and surface water accounted for the majority of the TWS anomalies in southern and eastern ANC. The proposed remote sensing approach combining multiple data sources proved applicable and useful to understand the spatiotemporal characteristics of hydrological variability in a large area of arid land without the need for field observations.http://dx.doi.org/10.1155/2018/1502472 |
| spellingShingle | Yanping Cao Zhuotong Nan Guodong Cheng Ling Zhang Hydrological Variability in the Arid Region of Northwest China from 2002 to 2013 Advances in Meteorology |
| title | Hydrological Variability in the Arid Region of Northwest China from 2002 to 2013 |
| title_full | Hydrological Variability in the Arid Region of Northwest China from 2002 to 2013 |
| title_fullStr | Hydrological Variability in the Arid Region of Northwest China from 2002 to 2013 |
| title_full_unstemmed | Hydrological Variability in the Arid Region of Northwest China from 2002 to 2013 |
| title_short | Hydrological Variability in the Arid Region of Northwest China from 2002 to 2013 |
| title_sort | hydrological variability in the arid region of northwest china from 2002 to 2013 |
| url | http://dx.doi.org/10.1155/2018/1502472 |
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