中文摘要：

2003年夏季中国第二次北极科学考察期间．在北冰洋楚科奇海陆架、楚科奇海台、陆坡流区、门捷列夫海岭和加拿大海盆等不同区域进行了200m以浅海水和部分观察站沉积物表层叶绿素a浓度的现场观测。结果表明，观测水体叶绿素α浓度变化范围为0．002～39，008μg/dm^3。表层浓度分布范围为0．037-4．644μg/dm^3，平均值为0．612μg/dm^3；高叶绿素α浓度出现在水深20～30m的次表层水。叶绿素α浓度分布具有明显的区域性特征，水柱平均浓度的次序为楚科奇海陆架区〉陆坡流区〉楚科奇海台区〉加拿大海盆区〉门捷列夫海岭区。表层沉积物叶绿素α浓度从未能检出～3．978μg/g（湿重），平均浓度为0．954μg/g（湿重），表现为沉积物表层的浓度高于下层，陆架和陆坡流区的浓度高于海岭区以及海台和海盆区的分布特征。

英文摘要：

Investigations of chlorophyll α was carried out in the seawater and sediment in the Chukchi Sea, Chukchi Plateau, the Slop-flow area, the Mendeleev Ride and the Canada Basin during the 2^nd Chinese National Arctic Research Expedition in the summer of 2003. The results showed that chlorophyll α concentrations were 0. 002 - 39. 008 μg/dm^3 at the surveyed waters; the surface chlorophyll α concentrations were 0.037 -4.644μg/dm^3 and the average value was 0. 612 μg/dm^3 in the surveyed area. Chlorophyll α concentrations at the depths 20 - 30 m of the subsurface water were higher than that in the surface and under layer. Chlorophyll α concentration distribution was obviously areal characteristics. The areal arrange order of the water-column chlorophyll α concentration is the Chukehi Sea 〉 the Slop-flow area 〉 the Chukchi Plateau 〉 the Canada Basin 〉 the Mendeleev Ride. Chlorophyll α concentrations were 0 - 3. 978 μg/g （wet mug） in the sediment of the surveyed stations ; and the average value was 0. 934 μg/g（wet mug） in 7 surveyed stations. Chlorophyll α concentrations at the surface sediments were higher than that in the underlayer. The areal arrange order of the sediments chlorophyll α concentration is the Chukchi Sea 〉 the Slop-flow area 〉 the Mendeleev Ride, and chlorophyll α concentration can not be examined in the sediments of the Chukehi Plateau and the Canada Basin.