| .季节性积雪环境雪/气间汞通量特征初步研究[J].农业环境科学学报,2013,32(3):. |
| 季节性积雪环境雪/气间汞通量特征初步研究 |
| Research on Mercury Flux between Snow and Air under the Condition of Seasonal Snow Cover Environment |
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| DOI：10.11654/jaes.2013.03.028 |
| 中文关键词: 雪/气 汞通量 季节性积雪 农田 大气环境监测 |
| 英文关键词: snow/air mercury flux seasonal snow cover field atmospheric environment monitoring |
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| 摘要点击次数: 1851 |
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| 中文摘要: |
| 研究区域内冬季存有5个月以上稳定性季节积雪，为研究积雪地表状况下雪/气间汞交换通量特征，设置了平地农田和坡地农田2类共4处采样点，于2011年12月和2012年3月，使用动态通量箱法（dynamic flux chamber，DFC）与汞分析仪（LUMEX Zeeman RA915+）联用技术测定了各样点雪/气间汞交换通量，并同步测定太阳辐射、气温和气湿等气象因子，分析了雪/气间汞通量变化特征及其与气象因子等因素间的关系。结果表明：季节性积雪稳定存在时，雪/气间汞通量表现为明显的由大气指向雪面的沉降特征过程。季节性积雪趋于消融时，雪/气间汞通量表现为沉降与释放交替出现，总通量水平比积雪期降低一个数量级。雪/气间汞通量与大气汞浓度存在明显的负线性相关关系，与太阳辐射强度间有明显的正线性相关性，与气温和气湿间无线性相关性。 |
| 英文摘要: |
| In winter, there exists a steady period of seasonal snow cover over five months, against which background, the characteristics of mercury exchange flux between snow and air on the surface of the earth. In 2011 Dec. and 2012 March, four sample sites categorized into two divisions were set in the flat field and slope field respectively. The mercury exchange flux was measured through dynamic flux chamber, DFC and LUMEX Zeeman RA915+ and other meteorology factors like solar irradiation, air temperature and air humidity were also determined chronologically. The characteristics of variation in mercury exchange flux between the snow and air and its relationship with the meteorology factors. The research results display that the mercury exchange flux distinctly shows the deposit process from the air to the snow-covered earth surface when there exists constant seasonal snow cover while it illustrates the alternative processes between the deposit and release under the marked melting trend, representing the reduction of one order magnitude in the total mercury flux level. In addition, the remarkable negative lineal correlativity can be seen between the mercury flux and air mercury concentration. However, the noticeable positive lineal correlativity has been found between the mercury flux and the solar irradiation whereas no distinct correlativity is shown between the mercury flux and the air temperature as well as the air humidity. |
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