近岸海域^(226)Ra的时空变化与海底地下水排泄(SGD)估算  

Temporal and spatial variations of ^(226)Ra in coastal sea and the estimation of submarine groundwater discharge (SGD)

作　　者：季仲强[1,2] 胡丹 翁焕新[1] 张锋[1] 韩正栋 

机构地区：[1]浙江大学环境与生物地球化学研究所,浙江杭州310027 [2]国家海洋局第二海洋研究所国家海洋局海洋生态系统与生物地球化学重点实验室,浙江杭州310012 [3]浙江省辐射环境监测站,浙江杭州310012

出　　处：《地球化学》2012年第1期15-22,共8页Geochimica

基　　金：国家自然科学基金(40572175)

摘　　要：海底地下水排泄(submarine groundwater discharge,SGD)是沿海地区陆地物质向海洋输送的重要途径,中国具有漫长的海岸线,准确地评估我国沿海地区的SGD及其对沿海海洋生态环境的潜在影响具有重要的理论与实践意义。本文以浙江舟山朱家尖海湾为研究区域,通过冬、夏两季地下水和海水的同步采样分析,在研究地下水和海水中镭(226Ra)时空变化的基础上,利用226Ra的质量平衡原理,估算了研究区内SGD的通量为2.40×105～2.30×106 m3/d,根据12月份枯水期推算的全年保守通量为8.64×107～8.28×108 m3/a,另外,根据年平均降水量等水文参数估算的氮、磷和硅营养盐年平均的入海通量分别为3.256 t/a、0.029 t/a和52.775 t/a。Submarine groundwater discharge （SGD） is an important pathway for terrestrial material transferring to coastal sea. The shoreline is very long in China. Thus, there are important theoretic and practical meanings to accurately evaluate SGD and their potential effects to the ecological environment in coasts of China. The study area was in a gulf in Zhujiajian, Zhoushan, Zhejiang Province. Groundwater and sea water were sampled and analyzed during winter and summer, the dry and rainy season. Based on the temporal and spatial variations of ^226Ra in groundwater and sea water, the SGD flux in the study area is estimated to be 2.40×10^5-2.30×10^6m^3/d, using the mass balance of ^226Ra. and a conservative year average is 8.64×10^7-8.28×10^8m^3/a, based on the dry period data. Besides, the annual input flux of the nutrients, nitrogen, phosphorus and silicon, 3.256 t/a, 0.029 t/a and 52.775 t/a, separately, were estimated by hydrologic method using annual parameters, like precipitation et al.

关 键 词：226RA 海底地下水排泄(SGD) 近岸海域 营养盐 

分 类 号：P595[天文地球—地球化学]