北极王湾2010年夏季水体营养盐分布及影响因素

王湾海域位于北极斯瓦尔巴群岛西北侧,其水体特征主要受到北极冰川与大西洋的共同影响。为了研究冰川融水与大西洋水对王湾营养盐分布以及生态系统的影响,在2010年夏季黄河站考察期间,对王湾海水与地表径流进行采样分析,并测定了营养盐和叶绿素a。结果表明:2010年夏季王湾是大西洋水影响较弱的年份,以低温低盐高营养盐的本地变异水为主导。2010年7月王湾水体可以划分为4个水团,表层水(SW)、中层变异水(TIW)、本地变异水(TLW)和大西洋变异水(TAW),其中,表层水与中层变异水营养盐浓度较低,随着深度增加,本地变异水与大西洋变异水营养盐浓度都较高。大西洋变异水主要影响200m以深水柱,其营养盐浓度低于本地变异水影响的底部值,本地变异水中营养盐浓度的增加主要来自于颗粒物中营养盐的再生。表层水主要来源于地表径流与冰川融水,这些淡水输入与浮游植物的初级生产作用共同决定了表层水的营养盐浓度水平及结构。本地变异水中在水深100m上下出现的铵盐高值可能与浮游动物和/或微生物的代谢过程有关。

Nutrient distribution and the influencing factors of seawater in Arctic Kongsfjorden,summer 2010

Kongsfjorden is located in the northwest of Svalbard,Arctic,and the water is affected by Arctic glacier and the Atlantic Ocean. In order to study the affects of glacier water and Atlantic water on distribution of nutrients and the ecosystem in Kongsfjorden,seawater and runoff water were sampled and analyzed for the nutrients and Chlorophyll a during the Yellow River Station expedition in summer 2010. The results showed that,it was a weak year of the Atlantic water in kongsfjorden 2010,and the transformed local water with low temperature,low salinity and high nutrients was in control. The Kongsfjorden water in July 2010 could be divided into 4 water masses,including surface water (SW),transformed intermediate water (TIW),transformed local water (TLW) and transformed Atlantic water (TAW),of which,the nutrient concentration were low in SW and TIW,while,as the depth went deeper,nutrient concentrations were higher in TLW and TAW. The water column below 200 m was mainly controlled by TAW,and its nutrient concentration was lower than those in the bottom of TLW. The higher nutrients of TLW were mainly derived from the nutrient regeneration of the particulates in the water column. The glacier melting water and runoff water controlled the SW,and these freshwater inputs and the primary production of the phytoplankton together determined the nutrient concentrations and structures in SW. In the water column at about 100 m of TLW,the high ammonia concentration was connected with the metabolic processes of the zooplankton and/or microorganism.