北冰洋沉积物和海水叶绿素α浓度分布的区域性特征

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200 m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0.002～39.008 μg/dm3。表层浓度分布范围为0.037～4.644 μg/dm3，平均值为0.612 μg/dm3；高叶绿素α浓度出现在水深20～30 m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～3.978 μg/g(湿重)，平均浓度为0.954 μg/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。

The Areal Characteristics of Chlorophyll a Distribution in the Sediments and Seawater in the Surveyed Area, Arctic Ocean

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 0.037~4.644 μg/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 Chukchi 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 under layer. 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 Chukchi Plateau and the Canada Basin. 