An abrupt shift in the Labrador Current System in relation to winter NAO events

Wang, Zeliang; Brickman, David; Greenan, B. J. W.; Yashayaev, Igor

doi:10.1002/2016jc011721

Cited by 26 publications

(38 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The correlation pattern associated with the MAC index (Figure b) suggests a westward shift of the NAO‐like pattern that is associated with the EAC index (Figure d). This is consistent with a recent study that suggested that an increase in the Labrador Current over the 1000 m isobath after 2001 was due to both a decrease in the NAO index and a westward shift in the action centers of the NAO [ Wang et al ., ].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Variability and wind forcing of ocean temperature and thermal fronts in the Slope Water region of the Northwest Atlantic

et al. 2017

View full text Add to dashboard Cite

Subsurface temperatures in the Slope Water region of the Northwest Atlantic from Argo profiling floats and on the adjacent continental shelf from ship‐based measurements are compared with the latitudinal position of the Shelf‐Slope Front (SSF) and the Gulf Stream North Wall (GSNW). The Slope Water and shelf temperature anomalies at 200 m depth are in agreement for the period, 2002–2015. For the period 1978–2015, shelf temperatures are significantly correlated with the SSF position, and to a lesser extent with the GSNW position. Annual SSF position anomalies near the Grand Banks at 50°W–55°W lead anomalies to the west at 65°W–75°W by 1–2 years. Wind stress curl is compared with the annual change in the SSF and GSNW latitudinal positions, rather than with the positions directly. Changes in the mean position of the SSF are related to the wind stress curl pattern in the mid‐Atlantic, with an 8 month lag. It is suggested that a wind pattern favoring a southward shift of the SSF is associated with a southward shift of the zero‐curl line near 40°W, resulting in an expanded subpolar gyre and enhanced flow of Labrador Current Water westward from the Tail of the Grand Banks. However, changes in the GSNW position are related to an NAO‐like wind stress curl pattern in the eastern Atlantic in the winter‐spring period, in agreement with other studies. High sea surface temperatures in the Gulf of Maine and on the Scotian Shelf in recent years can be largely attributed to positive local onshore wind anomalies.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The large positive wind stress curl area in the subpolar gyre region essentially merged with the small area in the Slope Water region, expanding the wind‐driven subpolar gyre to the southwest. Numerical models suggest this would strengthen the Labrador Current and extend it around the Tail of the Grand Banks [ Marsh , ; Wang et al ., ].…”

Section: Resultsmentioning

confidence: 99%

Variability and wind forcing of ocean temperature and thermal fronts in the Slope Water region of the Northwest Atlantic

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Changes in oceanographic conditions add important variability during the larval dispersal phase and they directly influence dispersal kernels (Cowen & Sponaugle, 2009). For example, the North Atlantic Oscillation (NAO) influences oceanographic conditions in Atlantic Canada, and the resulting circulation regime can vary significantly among years (Han, Chen, & Ma, 2014;Han et al, 2010;Wang, Brickman, Greenan, & Yashayaev, 2016). More specifically, the Northwest Atlantic subpolar gyre and the Labrador Current are primary drivers of the current regime on the NL shelf (Loder, Petrie, & Gawarkiewicz, 1998), which weakens or strengthens depending on NAO atmospheric conditions (Han et al, 2014), which, in turn, may alter dispersal kernels among management areas.…”

mentioning

confidence: 99%

Assessing connectivity patterns among management units of the Newfoundland and Labrador shrimp population

Corre

Pepin

et al. 2018

Fisheries Oceanography

View full text Add to dashboard Cite

The Eastern Canadian northern shrimp population, representing one of the most important fisheries in the region, decreased dramatically since the mid‐2000s to a historical low in 2017, but changes were not spatially uniform. Applying a biophysical model within Newfoundland and Labrador (NL) management areas, we investigated connectivity processes during the long pelagic larval phase (2–3 months) of Pandalus borealis and key drivers of larval dispersal in different environmental conditions. We selected 3 years representative of contrasting North Atlantic Oscillation (NAO) phases to assess potential larval dispersal patterns of the northern shrimp population in NL, and hierarchically assessed the impact of the timing of release (yearly and daily), release location, and vertical migration behaviour on shrimp larval dispersal. Overall, we found that populations located on the northern Newfoundland and Labrador shelf supplied potential settlers to southern populations because of the dominant Labrador Current. Ocean circulation and current velocities during the NAO positive year differed from other years, generating contrasting settlement spatial patterns. Larval release location and vertical migration behaviour were the two most important influences on the strength of larval supply and settlement patterns. Inclusion of diel and ontogenic swimming behaviour increased settlement success of larvae released from inshore areas, regardless of study years. Our study improves understanding of northern shrimp stock‐recruitment relationships, their sensitivity to changing environmental conditions, and spatially non‐homogeneous population decline for bentho‐pelagic species with a long larval phase, which could potentially help improve management strategies.

show abstract

“…One of the objectives of this study was to represent areas known as mackerel spawning sites and those where mackerel could spawn, and to see their evolution in a changing environment under climate change scenario. We used environmental variables of the Bedford Institute of Oceanography North Atlantic Model (BNAM) simulations for the north-west Atlantic region (Brickman, Hebert, & Wang, 2018;Brickman, Zeliang, & DeTracey, 2016;Wang, Brickman, & Greenan, 2019;, Brickman, Greenan, & Yashayaev, 2016). We were not able to fit GAMs on model variables because the latter were only available in monthly mean of present (1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012) and future (2066-2085) climatologies.…”

Section: Projected Spawning Habitat Distribution Under Climate Chanmentioning

confidence: 99%

Modelling Atlantic mackerel spawning habitat suitability and its future distribution in the north‐west Atlantic

Mbaye

Doniol‐Valcroze

Brosset

et al. 2019

Fisheries Oceanography

Self Cite

View full text Add to dashboard Cite

We investigated the effect of environmental conditions on Atlantic mackerel spawning habitat in the southern Gulf of St. Lawrence (sGSL). Based on generalized additive models, we (i) modelled the optimal spawning habitat of mackerel in the sGSL using daily egg production (DEP) in June, (ii) predicted known and new potential present spawning habitats in the GSL and the north‐west Atlantic, and (iii) assessed how they respond to future climate change. Our findings showed that both mackerel presence–absence and given‐presence DEP were associated with sea surface temperature (10–16.5°C), salinity above 31 and depth < 120 m. Adding zooplankton showed a marked effect on the DEP given‐presence compared to the presence–absence. Predictions of spawning habitats under present (1999–2012) and future scenario (2066–2085) conditions were estimated from the presence–absence model without zooplankton, using physical conditions of the BNAM. Under present conditions, our model predicted well the main spawning habitat in the sGSL and other known secondary spawning habitats in the northern GSL (nGSL), the western and southern Newfoundland, and the north‐west Atlantic coast. Under future conditions, our study suggests that spawning habitats in the sGSL and the nGSL would expand. Our results, therefore, suggest that mackerel could benefit from a warmer GSL, minimizing the potential for a northward migration of the stock due to decreasing suitability of the sGSL as its main spawning ground, and a new but spatially limited potential habitat in Newfoundland coasts. These results can be used to inform stock management and develop adaptive management plans in the context of climate change.

show abstract

An abrupt shift in the Labrador Current System in relation to winter NAO events

Cited by 26 publications

References 46 publications

Variability and wind forcing of ocean temperature and thermal fronts in the Slope Water region of the Northwest Atlantic

Variability and wind forcing of ocean temperature and thermal fronts in the Slope Water region of the Northwest Atlantic

Assessing connectivity patterns among management units of the Newfoundland and Labrador shrimp population

Modelling Atlantic mackerel spawning habitat suitability and its future distribution in the north‐west Atlantic

Contact Info

Product

Resources

About