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2004-06-21～2004-09-10对天山南坡科其喀尔冰川作用区河水、大气降水及冰川进行水化学采样和分析实验,计算了地壳源物质的化学侵蚀率和大气CO2沉降量.分析结果表明,大气降水中溶质补给率平均为60.7kg.(km2.d)-1,占流域总溶质通量791.2kg.(km2.d)-1的7.7%.冰川冰中溶质因冰溶解作用补给河水中溶质的补给率平均为60.2kg.(km2.d)-1,占7.6%.地壳源水化学侵蚀率为558.0kg.(km2.d)-1,占70.5%,是河水中可溶性离子的主要来源.其中,流出SO24-总通量为171.1kg.(km2.d)-1,主要来源于地壳水化学侵蚀补给,占90.6%,其次是大气降水补给,占5.6%;流出HCO3-总通量为308.9kg.(km2.d)-1,其中硫化物氧化作用导致碳酸盐水解补给的HCO3-为84.2kg.(km2.d)-1,在吸收大气CO2引起的碳酸化作用过程中,源于大气CO2的HCO3-与源于碳酸盐的HCO3-相等,均为112.3kg.(km2.d)-1,相当于暂时性吸收大气CO2通量为81.0kg.(km2.d)-1,占流域总溶质通量的14.2%.利用碳酸盐水解法计算的地壳溶质侵蚀通量为641.1kg.(km2.d)-1,比前者利用物质平衡原理计算过程中考虑与不考虑大气CO2沉降的结果分别相差14.9%和4.4%.本研究对于评估我国西部资料匮乏的冰川区的水化学侵蚀和冰川区对碳循环的贡献具有重要的示范意义.
2004-06-21 ~ 2004-09-10 Water chemistry sampling and analysis experiments were carried out for river water, atmospheric precipitation and glaciers in the Keke’er glacier area on the southern slope of Tianshan Mountains. Chemical erosivity and atmospheric CO2 deposition The results show that the average solute recharge rate in the precipitation is 60.7kg (km2.d) -1, accounting for 7.7% of the total solute flux in the basin, 791.2kg (km2.d) -1. The average recharge rate of solute in river water is 60.2kg (km2.d) -1, accounting for 7.6%. The chemical erosion rate of crust source water is 558.0kg (km2.d) -1, accounting for 70.5% of the river water (Km2.d) -1, mainly from the chemical erosion of the crust, accounting for 90.6%, followed by the atmospheric precipitation recharge, accounting for 5.6%; the main source of soluble ions in which outflow SO24- total flux of 171.1kg. The total flux of HCO3-outflow is 308.9 kg. (Km2.d) -1, in which the oxidation of sulfide leads to 84.2 kg. (Km2. D) -1 of HCO3- In the process of chemical conversion, the HCO3- derived from the atmospheric CO2 is equal to the HCO3- derived from the carbonate, both being 112.3 kg. (Km2.d) -1, equivalent to a transient absorption of atmospheric CO 2 flux of 81.0 kg. km2.d) -1, accounting for the total solute flux in the basin 14.2% .The crustal solute erosion flux calculated by carbonate hydrolysis method is 641.1kg (km2.d) -1, which is 14.9% and 4.4% lower than the former when using the material balance principle to calculate and not consider the atmospheric CO2 sedimentation respectively This study is of great significance for assessing water chemical erosion in the glacier region lacking in western China and the contribution of the glacier region to the carbon cycle.