采用<sup>222</sup>Rn示踪胶州湾的海底地下水排泄及营养盐输入

郭占荣; 马志勇; 章斌; 袁晓婕; 刘花台; 刘洁

doi:10.3799/dqkx.2013.105

采用²²²Rn示踪胶州湾的海底地下水排泄及营养盐输入

doi: 10.3799/dqkx.2013.105

厦门大学海洋与地球学院，福建厦门 361005

基金项目:

国家自然科学基金项目 41072174

详细信息

作者简介:
郭占荣(1965-)，男，博士，教授，从事海岸带水文地质和海洋地质研究.E-mail: gzr@xmu.edu.cn

中图分类号: P641
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出版历程
- 收稿日期: 2012-10-10
- 刊出日期: 2013-09-15

Tracing Submarine Groundwater Discharge and Associated Nutrient Fluxes into Jiaozhou Bay by Continuous ²²²Rn Measurements

College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China

摘要

摘要: 为了量化胶州湾东北海岸带的海底地下水排泄量和评价通过海底地下水排泄输入的营养盐数量，分别于2011年10月和2012年5月在胶州湾北岸东大洋码头附近对海水中的²²²Rn进行了48 h连续测量.通过构建测量点海水中²²²Rn质量平衡模型，计算得到海底地下水排泄速率平均值分别为6.38 cm/d和8.29 cm/d；实际观测到的海底地下水排泄速率变动较大，其主要控制因素是降水量、潮汐和波浪.根据海底地下水排泄速率，获得地下水输入的DIN(溶解无机氮)为47.0×10³ mol/d(2011年10月)和48.6×10³ mol/d(2012年5月)，可溶性SiO₂为15.5×10³ mol/d(2011年10月)和17.3×10³ mol/d(2012年5月)，DIP(溶解性磷酸盐)为0.6×10³ mol/d(2012年5月)，地下水对胶州湾的营养盐输入具有重要贡献.
- 海底地下水排泄 /
- ²²²Rn /
- 营养盐 /
- 胶州湾 /
- 海洋地质
Abstract: The aim of this paper is to quantify submarine groundwater discharge (SGD) into the northeast coast of Jiaozhou Bay, then estimate the SGD-derived nutrient fluxes. At Dongdayang dock located at the north shoreline of Jiaozhou Bay, the author deployed one in-situ 48 h continuous experiment for measuring ²²²Rn activity in seawater, in October 2011 and May 2012, respectively. Through establishing ²²²Rn mass balance model at the observing site, the average SGD rates are assessed to be 6.38 cm/d for October 2011 and 8.29 cm/d for May 2012. Measured results show the SGD rates fluctuate greatly, daily and seasonally, which are mainly controlled by precipitation, tidal pump and wave oscillation. Based on the SGD rates, the SGD-derived nutrient fluxes are calculated to be 47.0×10³-48.6×10³ mol/d for DIN (dissolved inorganic nitrogen), 15.5×10³-17.3×10³ mol/d for the soluble SiO₂, and 0.6×10³ mol/d for DIP (dissolved inorganic phosphorus), respectively. These SGD-derived nutrient fluxes contribute to the eutrophication in Jiaozhou Bay to a certain degree which need due attention.
- submarine groundwater discharge /
- radon-222 /
- nutrients /
- Jiaozhou Bay /
- submarine geology

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图 1 胶州湾及取样点、连续测量点位置

Fig. 1. Sampling stations and measurement site in Jiaozhou Bay

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图 2 海水中²²²Rn活度与水深变化(时间：第1行是钟点(时: 分)；第2行是日期(月-日))

Fig. 2. Variation of ²²²Rn activities in seawater and depth of water in the monitoring site

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图 3 地下水中²²²Rn活度的时空变化

Fig. 3. Temporal and spatial variation of ²²²Rn activities in groundwater

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图 4 连续测量点海水中²²⁶Ra活度及其变化(时间：第1行是钟点(时: 分)；第2行是日期(月-日))

Fig. 4. Variation of ²²⁶Ra activities in seawater and depth of water in the monitoring site

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图 5 连续测量点处大气损失与风速、水温(时间：第1行是钟点(时: 分)；第2行是日期(月-日))

Fig. 5. Variation of atmospheric loss, wind velocity and water temperature in the monitoring site

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图 6 ²²²Rn的混合损失通量的估算(时间：第1行是钟点(时: 分)；第2行是日期(月-日))

Fig. 6. Plot showing the method for estimating the mixing loss flux of ²²²Rn

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图 7 海底地下水排泄速率(时间：第1行是钟点(时: 分)；第2行是日期(月-日))

Fig. 7. Variation for the rate of submarine groundwater discharge during monitoring

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表 1 沉积物孔隙水中²²²Rn活度

Table 1. ²²²Rn activities in the pore water of sediments

样品编号	SD1	SD2	SD3	SD4	SD5	SD6	SD7	SD8
沉积物(Bq/kg)	0.70	0.87	0.48	0.75	0.82	0.46	0.76	0.65
孔隙水(Bq/m³)	2 416.65	3 447.46	2 060.54	2 756.01	2 717.87	1 653.81	2 549.66	2 283.38

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表 2 地下水中的营养盐浓度及估算通量

Table 2. Nutrients in groundwater and nutrient loadings

日期	水样	DIN(μM)	DIN通量(10³ mol/d)	PO₄³-P(μM)	PO₄³-P通量(10³ mol/d)	SiO₂-Si(μM)	SiO₂-Si通量(10³ mol/d)
2011年10月	G18	730.3		未检出		211.9
2011年10月	G19	744.1		未检出		273.3
平均值		737.2	47.0			242.6	15.5
2012年5月	G18	612.7		7.2		231.4
2012年5月	G19	559.1		7.5		186.3
平均值		585.9	48.6	7.4	0.6	208.9	17.3

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