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| Characteristics of mercury flux between soil and air under the meteorological condition of durative precipitation |
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Abstract At the Jiapigou gold mine of the Songhua River upstream from April 22~25, 2012, the combination technique of the dynamic flux chamber, DFC and the LUMEX Zeeman RA915+ had been used to measure mercury exchange flux between soil and air under the control of durative precipitation. Moreover, the air mercury concentrations in the range of near-surface vertical direction 0~150 cm, solar irradiation intensity, air temperature and humidity had been determined synchronously. Furthermore, the relationships among mercury exchange flux and meteorology factors under the control of precipitation had been analyzed to research the features and its influencing factors in the natural conditions. The results show that under the control of durative precipitation, mercury exchange flux between the earth surface and air showed the features of the process of deposit and release continuous interleave appeared, it is obviously different from day type mercury flux's single summit structure under a fair weather condition. In precipitation intermission, mercury exchange flux between soil and air at slope farmland sampling site were (-2.08±6.11), (-6.16±33.57), (-3.20±8.64) and (5.06±18.80)ng/(m2·h); on the floodplain of valley bottom sample site were (-5.21±6.42), (3.87±28.12), (-11.87±14.10) and (-9.44±12.23) ng/(m2·h).In the range of partly narrow region, the difference of terrain conditions affected energy budget of different earth's surface and near-surface air system, and made near-surface air mercury concentrations andmeteorology factors changed, then affected mercury flux's process and level. Under the durative precipitation, mercury flux between earth's surface and air had obviously positive linear relation with solar irradiation intensity and air humidity, and it doesn't had obviously linear relation with air mercury concentrations and air temperature.
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Received: 02 July 2012
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