Seasonal and interannual dynamics of Calanus finmarchicus in the Gulf of Maine (Northeastern US shelf) with reference to the North Atlantic Oscillation
Seasonal and interannual dynamics of Calanus finmarchicus in the Gulf of Maine (Northeastern US shelf) with reference to the North Atlantic Oscillation
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DOI：
10.1016/s0967-0645(00)00088-6
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发表时间：
2001-01-01
影响因子：
3
通讯作者：
Hameed, S
中科院分区：
文献类型：
--
作者：
Conversi, A;Piontkovski, S;Hameed, S
利用浮游生物连续记录仪和综合海洋-大气数据集，对缅因州湾30年来的哲水蚤调查进行了时间动态研究。哲水蚤丰度的变化进行了比较，在缅因州湾的海面温度和北大西洋涛动指数。时间动态的三个主要组成部分进行了分析：季节循环，年际和年代际变化。C.的季节循环finmarchicus丰度在高与低NAO年不同，具有较高的总体丰度和更明显的年度信号在高NAO年。C、f的年际波动丰度与NAO指数也呈正相关，丰度对NAO指数的“响应”滞后4年。NAO指数与冬季海温也呈显著正相关，提前2年。另一方面，SST与Calanus finmarchicus呈正相关（领先2年）。在过去的三十年里，C。缅因州湾的finmarchicus丰度呈上升趋势，缅因州湾的海表温度和NAO指数也有上升趋势。这些观测结果与以下假设一致：在缅因州湾，水柱的变化（如SST所示）与大气系统的变化（如NAO指数所示）有关，因此指数的正异常有利于水柱的变化（仍有待调查），这对应于有利于增加Calanus finmarchicus丰度的条件。(C)2000爱思唯尔科技有限公司版权所有。
The Continuous Plankton Recorder and the Comprehensive Ocean-Atmosphere Data Set were used to study the temporal dynamics over 30 years of the Calanus finmarchicus surveys in the Gulf of Maine. Changes in Calanus abundance were compared to those in the sea-surface temperature in the Gulf of Maine and in the North Atlantic Oscillation index. Three major components of temporal dynamics were analyzed: seasonal cycle, interannual, and interdecadal variability. Seasonal cycles of C. finmarchicus abundance were different in high versus low NAO years, with higher overall abundance and a more pronounced annual signal during high NAO years. Interannual fluctuations of C,f. abundance and NAO index were also positively correlated, with abundance "responding" to the NAO index with a lag of 4 years. The NAO index was also positively correlated to the winter SST, leading it by 2 years. SST, on the other hand, was positively correlated with Calanus finmarchicus (leading it by 2 years). Over the past three decades, C. finmarchicus abundance in the Gulf of Maine showed an increasing trend, a phenomenon seen also in the sea surface temperature of the Gulf of Maine and ill the NAO index. These observations are consistent with the hypothesis that in the Gulf of Maine changes in the water column (as indicated by SST) are related to changes in the atmospheric system (as indicated by the NAO index) so that positive anomalies in the index favor changes in the water column (still to be investigated), which correspond to conditions favorable to increases in abundance of Calanus finmarchicus. (C) 2000 Elsevier Science Ltd. All rights reserved.