Climate-driven changes in grassland vegetation, snow cover, and lake water of the Qinghai Lake basin

Abstract. Qinghai Lake basin and the lake have undergone significant changes in recent decades. We examine MODIS-derived grassland vegetation and snow cover of the Qinghai Lake basin and their relations with climate parameters during 2001 to 2010. Results show: (1) temperature and precipitation of the Qinghai Lake basin increased while evaporation decreased; (2) most of the grassland areas improved due to increased temperature and growing season precipitation; (3) weak relations between snow cover and precipitation/vegetation; (4) a significantly negative correlation between lake area and temperature (r=−0.9, p<0.05); and (5) a positive relation between lake level (lake-level difference) and temperature (precipitation). Compared with Namco Lake (located in the inner Tibetan Plateau) where the primary water source of lake level increases was the accelerated melt of glacier/perennial snow cover in the lake basin, for the Qinghai Lake, however, it was the increased precipitation. Increased precipitation explained the improvement of vegetation cover in the Qinghai Lake basin, while accelerated melt of glacier/perennial snow cover was responsible for the degradation of vegetation cover in Namco Lake basin. These results suggest different responses to the similar warming climate: improved (degraded) ecological condition and productive capacity of the Qinghai Lake basin (Namco Lake basin).

[1]  Xiao Jian-she.  Cause of Water Level Fluctuation in Qinghai Lake from 1960 to 2009 and Its Future Trend Forecasting , 2011 .

[2]  Hongjie Xie,et al.  Interrelation among climate factors, snow cover, grassland vegetation, and lake in the Nam Co basin of the Tibetan Plateau , 2014 .

[3]  Yan Huayun.  Water Balance and Water Resources Allocation of Qinghai Lake , 2003 .

[4]  Yi Wang,et al.  Hydrological and solute budgets of Lake Qinghai, the largest lake on the Tibetan Plateau , 2010 .

[5]  Yong Wang,et al.  Investigation of bathymetry and water quality of Lake Nam Co, the largest lake on the central Tibetan Plateau, China , 2009, Limnology.

[6]  J. Hansen,et al.  Global surface air temperatures: update through 1987 , 1988 .

[7]  J. Jones,et al.  Factors affecting the measurement of antibiotic resistance in bacteria isolated from lake water. , 1986, The Journal of applied bacteriology.

[8]  Zuwang Wang,et al.  Population declines of Przewalski's gazelle around Qinghai Lake, China , 2000, Oryx.

[9]  Yong Zha,et al.  Assessment of grassland degradation near Lake Qinghai, West China, using Landsat TM and in situ reflectance spectra data , 2004 .

[10]  Chu Jing-zhen.  Inheritance and Changing-on the Political Functions of the Conventional System of Offering Sacrifice to Qinghai Lake , 2013 .

[11]  Xiao-Yan Li,et al.  Lake-Level Change and Water Balance Analysis at Lake Qinghai, West China during Recent Decades , 2007 .

[12]  Ronald W. Schafer,et al.  What Is a Savitzky-Golay Filter? [Lecture Notes] , 2011, IEEE Signal Processing Magazine.

[13]  Sun Yong-liang,et al.  Climate Change and Hydrological Response in the Watershed of Qinghai Lake , 2008 .

[14]  W. Oechel,et al.  Variability of the Seasonally Integrated Normalized Difference Vegetation Index Across the North Slope of Alaska in the 1990s , 2003 .

[15]  Li Ling,et al.  Mapping and Analyses of Permafrost Change in the Qinghai Plateau Using GIS , 2005 .

[16]  Shi Ya,et al.  Preliminary Study on Signal, Impact and Foreground of Climatic Shift from Warm-Dry to Warm-Humid in Northwest China , 2002 .

[17]  C. Wood,et al.  The effect of hypoxia on gill morphology and ionoregulatory status in the Lake Qinghai scaleless carp, Gymnocypris przewalskii , 2008, Journal of Experimental Biology.

[18]  Hao Xin,et al.  A Green Fervor Sweeps the Qinghai-Tibetan Plateau , 2008, Science.

[19]  N. Reynard,et al.  The effects of climate change due to global warming on river flows in Great Britain , 1996 .

[20]  Shuheng Li,et al.  Spatial-temporal patterns of vegetation dynamics and their relationships to climate variations in Qinghai Lake Basin using MODIS time-series data , 2014, Journal of Geographical Sciences.

[21]  S. Solomon.  The Physical Science Basis : Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change , 2007 .

[22]  Liu Feng.  Spatial and Temporal Variations of Snow Cover Area and NDVI in the West of Tianshan Mountains , 2010 .

[23]  Timothy Cogley,et al.  Effects of the Hodrick-Prescott filter on trend and difference stationary time series Implications for business cycle research , 1995 .

[24]  Peng Min,et al.  Relationship between Qinghai lake level descending and artificial water-consumption , 1995 .

[25]  K. Vinnikov,et al.  Empirical Data on Contemporary Global Climate Changes (Temperature and Precipitation) , 1990 .

[26]  S. K. McFeeters.  The use of the Normalized Difference Water Index (NDWI) in the delineation of open water features , 1996 .

[27]  Qun Huang,et al.  Evaluation of the Climatic Change Impacts on the Inland Lake – A Case Study of Lake Qinghai, China , 1998 .

[28]  Hongjie Xie,et al.  Quantitative water resources assessment of Qinghai Lake basin using Snowmelt Runoff Model (SRM) , 2013 .

[29]  Fulu Tao,et al.  Trends and variation in vegetation greenness related to geographic controls in middle and eastern Inner Mongolia, China , 2011 .

[30]  彭敏,et al.  RELATIONSHIP BETWEEN QINGHAI LAKE LEVEL DESCENDING AND ARTIFICIAL WATER－CONSUMPTION , 1995 .

[31]  Hongjie Xie,et al.  Spatio-Temporal Change of Snow Cover and Its Response to Climate over the Tibetan Plateau Based on an Improved Daily Cloud-Free Snow Cover Product , 2014, Remote. Sens..

[32]  Song Chang-bin,et al.  Freezing-Thawing Erosion in the Qinghai Lake Basin Based on Remote Sensing and GIS , 2012 .

[33]  Hongjie Xie,et al.  Water level variation of Lake Qinghai from satellite and in situ measurements under climate change , 2011 .

[34]  Ma Yujun.  Climate Change and Impact on Water Level of the Qinghai Lake Watershed , 2010 .

[35]  Hai Xu,et al.  Precipitation at Lake Qinghai, NE Qinghai–Tibet Plateau, and its relation to Asian summer monsoons on decadal/interdecadal scales during the past 500 years , 2007 .

[36]  Tian Hui-chun.  Impacts of climatic changes on grassland ecological environment of basin around Qinghai Lake , 2008 .

[37]  K. Briffa,et al.  Global Surface Air Temperature Variations During the Twentieth Century: Part 1, Spatial, Temporal and Seasonal Details , 1992 .

[38]  Xiao-dong Liu,et al.  Climatic warming in the Tibetan Plateau during recent decades , 2000 .