| Historic changes in flux of matter and nutrient budgets in the Bohai Sea |
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| 作者姓名： | LIU Sumei ZHANG Jing GAO Huiwang LIU Zhe |
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| 作者单位： | LIU Sumei(College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China);ZHANG Jing(College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China);GAO Huiwang,LIU Zhe(College of Environmental Sciences and Engineering, Ocean University of China, Qingdao 266100, China) |
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| 基金项目： | The Ministry of Education of China under contract，special funds from the National Key Basic Research Program of China under contract，Chinese Natural Sciences Foundation under contract |
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| 摘 要： | Over the past four periods （ 1959--1960, 1982--1983, 1992--1993, and 1998--1999）, the ecosystem of the Bohai Sea changed due to both a significant decrease of river water discharge from the Huanghe River and a reduction of precipitation. The shifts in nutrient chemistry could result in changes in the phytoplankton composition with an increased potential for non-diatom algal blooms. Simple box model was used to estimate the water - mass balance and nutrient budgets for the Bohai Sea. Water budgets indicate that the residual flow changed from out of the Bohai Sea before 1993, but became inflow to the Bohai Sea after then. The nutrient budgets developed indicate that the Bohai Sea was a sink for nutrients except for phosphate in 1959--1960 and 1982-- 1983 and for silicate in 1982--1983. Net water flow transports nutrients out of the Bohai Sea in 1959--1960, 1982--1983 and 1992--1993, but into the sea in 1998--1999 due to climate changes, such as precipitation and subsequent freshwater discharge. The residual fluxes of nutrients are minor relative to atmospheric deposition and riverine inputs. Conversions of phosphate values to carbon by stoichiometric ratios were used to predict that the system was net heterotrophic before 1982--1983 and net autotrophic after then. Nutrient budgets can explain the change of nutrient concentrations in the Bohai Sea except nitrates, which should include the surface runoff.
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| 关 键 词： | 渤海 涨潮 大气沉积 海洋学 |
| 收稿时间： | 2007/1/18 0:00:00 |
| 修稿时间： | 2007/8/15 0:00:00 |
Historic changes in flux of matter and nutrient budgets in the Bohai Sea |
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| LIU Sumei,ZHANG Jing,GAO Huiwang,LIU Zhe.Historic changes in flux of matter and nutrient budgets in the Bohai Sea[J].Acta Oceanologica Sinica,2008,27(5):81-97. |
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| Authors: | LIU Sumei ZHANG Jing GAO Huiwang and LIU Zhe |
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| Institution: | 1.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China2.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China3.College of Environmental Sciences and Engineering, Ocean University of China, Qingdao 266100, China |
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| Abstract: | Over the past four periods ( 1959-1960, 1982-1983, 1992-1993, and 1998-1999), the ecosystem of the Bohai Sea changed due to both a significant decrease of river water discharge from the Huanghe River and a reduction of precipitation. The shifts in nutrient chemistry could result in changes in the phytoplankton composition with an increased potential for non-diatom algal blooms. Simple box model was used to estimate the water - mass balance and nutrient budgets for the Bohai Sea. Water budgets indicate that the residual flow changed from out of the Bohai Sea before 1993, but became inflow to the Bohai Sea after then. The nutrient budgets developed indicate that the Bohai Sea was a sink for nutrients except for phosphate in 1959-1960 and 1982-1983 and for silicate in 1982-1983. Net water flow transports nutrients out of the Bohai Sea in 1959-1960, 1982-1983 and 1992-1993, but into the sea in 1998-1999 due to climate changes, such as precipitation and subsequent freshwater discharge.The residual fluxes of nutrients are minor relative to atmospheric deposition and riverine inputs. Conversions of phosphate values to carbon by stoichiometric ratios were used to predict that the system was net heterotrophic before 1982-1983 and net autotrophic after then. Nutrient budgets can explain the change of nutrient concentrations in the Bohai Sea except nitrates, which should include the surface runoff. |
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| Keywords: | freshwater discharge precipitation nutrients atmospheric deposition budget Bohai Sea |
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