【摘要】 2003年7~9月中国第2次北极科学考察在北太平洋和白令海的BR断面和白令海峡南口门的BS断面的初夏和夏末两航段进行叶绿素-a浓度和初级生产力的现场观测。结果表明,BR断面表层叶绿素-a浓度为0·199~1·170μg/dm3,平均值为(0·723±0·283)μg/dm3;水深10~30m次表层的叶绿素-a浓度明显高于真光层下的深层水。水柱平均叶绿素-a浓度呈现明显的区域性特征,白令陆架区>白令陆坡区>阿留申海盆区>北太平洋西部海域。BS断面叶绿素-a浓度高于BR断面,夏末的平均浓度((5·311±5·656)μg/dm3)是初夏浓度((1·605±1·194)μg/dm3)的3.3倍,是BR断面平均浓度的7·5倍。观测站真光层内初级生产力在0·471~19·046mgC/(m3·h),陆架海域的初级生产力明显高于陆坡和海盆区,BS断面的平均初级生产力比BR断面高约12倍。观测站光合作用同化数在0·45~2·80mgC/(mgChla·h)。更多还原

【Abstract】 Investigations of standing stock of phytoplankton (chlorophyll a) and primary productivity were carried out in the Bering Sea along a longitudinal (the BR line, 51°38′～60°40′N, 168°06′E～178°15′W) and a latitudinal (the BS line, 64°20′N, 171°30′W～167°00′W) transects during the 2 nd Chinese National Arctic Research Expedition in the summer of 2003. The stations of the BR line were surveyed on 24～27 July (early summer) and the survey of the BS line took place on 28～29 July (early summer) and on 12～13 September (latter summer), respectively. The results showed that the surface chlorophyll a concentrations were 0.199～1.170 μg/dm3, and the average value was (0.723±0.283) μg/dm3 on the BR line. For the BS line, surface chlorophyll a concentrations were 0.519～4.644 μg/dm3 (average (1.605±1.194) μg/dm3) and 0.568～14.968 μg/dm3 (average (5.311±5.656) μg/dm3) during the early and latter summer, respectively. The average value in the latter summer was much higher than that in the early summer. The high values (more than 4.0 μg/dm3) occurred at stations of the BS line in the southern Bering Channel. Chlorophyll a concentrations in the sub-surface layer were higher than in the surface layer. The potential primary productivities varied between 0.471 and 1.147 mgC/(m3·h) on the BR line, with average rates of (0.728±0.315) mgC/(m3·h). The potential primary productivities on the BS line were much higher than that of the BR line, ranging from 1.227 mgC/(m3·h) at early summer to 19.046 mgC/(m3·h) at latter summer. The assimilation number of photosynthesis was 0.45～2.80 mgC/(mgChla·h).更多还原