春季水华对南黄海总溶解态无机砷生物地球化学行为的影响

孙友旭; 任景玲; 刘素美; 刘诚刚

doi:10.3969/j.issn.0253-4193.2015.04.002

春季水华对南黄海总溶解态无机砷生物地球化学行为的影响

doi: 10.3969/j.issn.0253-4193.2015.04.002

1.
中国海洋大学海洋化学理论与工程技术教育部重点实验室, 山东青岛 266100
2.
国家海洋局第二海洋研究所, 浙江杭州 310012

基金项目: 国家基础研究发展规划项目(2011CB409801);国家自然科学基金(41176096).

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出版历程
- 收稿日期: 2014-07-15
- 修回日期: 2014-12-10

The impact of spring bloom on the biogeochemical behavior of total dissolved inorganic arsenic in the South Yellow Sea

1.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
2.
Second Institute of Oceanography, State Ocean Administration, Hangzhou 310012, China

摘要

摘要: 利用氢化物发生-原子荧光光谱法(HG-AFS)对2007年3月30日至4月23日南黄海海域总溶解态无机砷(TDIAs, [TDIAs]=[As⁵⁺]+[As³⁺])的含量进行了测定,其中针对水华中心区域(BM1站)进行了25 h的连续观测,以探讨春季水华对有毒类金属元素砷的生物地球化学行为的影响.结果表明,TDIAs的浓度范围为7.9 ~ 22.3 nmol/L,平均值为(17.8±1.9) nmol/L.TDIAs在南黄海的分布主要表现为由近岸向外海逐渐升高的趋势,最大值出现在南部海域底层海水中.近岸海域表、底层TDIAs的含量相当,而中、南部海域由于存在明显的密度跃层,表、底层TDIAs的浓度具有显著性差异.2007年3月31日至4月1日研究区域西南部受到沙尘天气和降雨的影响,表层海水中TDIAs的含量显著升高.研究区域中、南部海域在观测期间暴发了典型的黄海春季水华,通过大面观测和对重点区域的连续观测可以发现,水华期间TDIAs的分布和磷酸盐类似,与Chl a呈现出较好的负相关关系(r=0.51,p <0.05,n=39).经初步计算,浮游植物水华对10 m以上表层水体中TDIAs的清除量约为2.4 nmol/L,占表层保有量的15%左右.通过箱式模型计算得出黄海TDIAs的停留时间约为(15.6±7.3) a,远远低于大洋.通过对该海域砷、磷摩尔比值的计算可以发现,南黄海砷、磷摩尔比值为大洋中的20倍左右,这可能会引起浮游生物对砷酸盐的大量吸收和转化,从而带来潜在的生态危机,需要引起足够的重视.
- 总溶解态无机砷 /
- 分布 /
- 春季水华 /
- 南黄海
Abstract: In order to understand the impact of spring bloom on the biogeochemical behavior of arsenic (a toxic metalloid element) in the South Yellow Sea (SYS),the field investigation was carried out during March 30th to April 23rd 2007 to study the concentrations and distributions of total dissolved inorganic arsenic (TDIAs,[TDIAs]=[As⁵⁺]+[As³⁺]) in the SYS. In addition,a 25 h anchor station (BM1) was also carried out at the central of SYS,where Chl a concentrations were higher than 4 μg/L. The concentrations of TDIAs were measured by Hydride Generation-Atomic Fluorescence Spectrometry (HG-AFS) and showed the range of 7.9-22.3 nmol/L,with the average of (17.8±1.9) nmol/L. The concentrations of TDIAs increased gradually from the coastal area to offshore,with the maximum values appearing at the near bottom layer of the southern region. The concentrations of TDIAs showed well mixed vertical profile in the coastal area,while was stratified in the middle and southern region. Due to the impact of strong dust storm and followed rainfall in the SYS during the investigation of March 31st to April 1st 2007,the concentrations of TDIAs in the surface waters were significant increased. A large-scale spring bloom occurred in the middle and southern region of study area for 4-5 days after the dust storm. Through the observations it can be found that the vertical profiles of TDIAs was similar to that of phosphate,and showed relatively negative relationships with chlorophyll a(r=0.51,p <0.05,n=39). After primary estimation,the scavenging of TDIAs by phytoplankton above 10 meters layer can reach up to 2.4 nmol/L,which account for 15% of that in the surface waters. The residence time of TDIAs in the YS was (15.6±7.3) a,which is much lower than the open oceans. The molar ratio of arsenic to phosphorus in the study area was about 20 times higher than the open ocean,which might lead to significant absorption and transformation of arsenate and cause the potential ecological crisis.
- total dissolved inorganic arsenic /
- distribution /
- spring bloom /
- the South Yellow Sea

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