Seasonal and interannual dynamics of Calanus finmarchicus in the Gulf of Maine (Northeastern US shelf) with reference to the North Atlantic Oscillation

Alessandra Conversi, Sergey Piontkovski, Sultan Hameed

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Abstract

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 in 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.

Original languageEnglish
Pages (from-to)519-530
Number of pages12
JournalDeep-Sea Research Part II: Topical Studies in Oceanography
Volume48
Issue number1-3
DOIs
Publication statusPublished - 2001

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Calanus finmarchicus
North Atlantic Oscillation
sea surface temperature
surface temperature
Calanus
water column
plankton
water
oceans
Gulf of Maine
index
gulf
winter
anomaly
atmosphere
ocean

ASJC Scopus subject areas

  • Aquatic Science
  • Geology
  • Oceanography

Cite this

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title = "Seasonal and interannual dynamics of Calanus finmarchicus in the Gulf of Maine (Northeastern US shelf) with reference to the North Atlantic Oscillation",
abstract = "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 in 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.",
author = "Alessandra Conversi and Sergey Piontkovski and Sultan Hameed",
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T1 - Seasonal and interannual dynamics of Calanus finmarchicus in the Gulf of Maine (Northeastern US shelf) with reference to the North Atlantic Oscillation

AU - Conversi, Alessandra

AU - Piontkovski, Sergey

AU - Hameed, Sultan

PY - 2001

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N2 - 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 in 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.

AB - 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 in 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.

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