Atlantic Multidecadal Oscillation (AMO) modulates dynamics of small pelagic fishes and ecosystem regime shifts in the eastern North and Central Atlantic

Alheit, Jürgen; Licandro, Priscilla; Coombs, S. H.; García, A.; Giráldez, Ana María Chocrón; Santamaría, M.T.G.; Slotte, Aril; Tsikliras, Athanassios C.

doi:10.1016/j.jmarsys.2013.11.002

Cited by 68 publications

(82 citation statements)

References 81 publications

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“…10c). In particular, the peaks in 2002 and 2004 can be attributed to anomalously warm conditions in the study area (Zeeberg et al, 2008;Alheit et al, 2014). Here, a period of near-neutral NAO together with an almost permanent El Niño phase during 2002-2004 might have acted in concert towards weakening trade winds which allows a stronger influence of the warm and northward flowing MC, supplying high amounts of pteropods from tropical waters.…”

Section: Carbonate Fluxes and Potential Enso Teleconnectionsmentioning

confidence: 85%

“…Cropper et al, 2014) and/or a strengthening of the northward flowing and warmer MC, combined with an enhanced supply of a nutrient-and Siricher source water (SACW instead of NACW). We favour the latter scenario as there is evidence of unusual warm surface water conditions (SST anomalies of +3 • C) related to weak trade wind intensity between 2002 and 2004 (Zeeberg et al, 2008;Alheit et al, 2014). These conditions might have led to a stronger influence of the northward flowing MC and the silicate-richer SACW which mixes into the Cape Blanc upwelling filament and, thus, contributed to higher BSi productivity and sedimentation.…”

Section: Influence Of the Nao On Biogenic Silica Sedimentationmentioning

confidence: 86%

“…High supply of dust into the surface ocean is often associated with dry conditions in the Sahel/Sahara in the previous year (Engelstaedter et al, 2006;Prospero and Lamb, 2003;Moulin and Chiapello, 2004). Indeed, the interval [2002][2003][2004] in particular is known to have been much warmer and drier during summer/autumn on land and in the ocean (Zeeberg Alheit et al, 2014). These conditions might have allowed the later wind-induced mobilization of larger amounts of dust particles into the atmosphere and led to a dust-enriched atmosphere during the entire year 2005, combined with elevated deep ocean mass fluxes.…”

Section: Interaction Between Mineral Dust and The Biological Pumpmentioning

confidence: 99%

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Deep ocean mass fluxes in the coastal upwelling off Mauritania from 1988 to 2012: variability on seasonal to decadal timescales

Fischer¹,

Romero²,

Merkel³

et al. 2016

Biogeosciences

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Abstract. A more than two-decadal sediment trap record from the Eastern Boundary Upwelling Ecosystem (EBUE) off Cape Blanc, Mauritania, is analysed with respect to deep ocean mass fluxes, flux components and their variability on seasonal to decadal timescales. The total mass flux revealed interannual fluctuations which were superimposed by fluctuations on decadal timescales. High winter fluxes of biogenic silica (BSi), used as a measure of marine production (mostly by diatoms) largely correspond to a positive North Atlantic Oscillation (NAO) index (December-March). However, this relationship is weak. The highest positive BSi anomaly was in winter 2004-2005 when the NAO was in a neutral state. More episodic BSi sedimentation events occurred in several summer seasons between 2001 and 2005, when the previous winter NAO was neutral or even negative. We suggest that distinct dust outbreaks and deposition in the surface ocean in winter and occasionally in summer/autumn enhanced particle sedimentation and carbon export on short timescales via the ballasting effect. Episodic perturbations of the marine carbon cycle by dust outbreaks (e.g. in 2005) might have weakened the relationships between fluxes and largescale climatic oscillations. As phytoplankton biomass is high throughout the year, any dry (in winter) or wet (in summer) deposition of fine-grained dust particles is assumed to enhance the efficiency of the biological pump by incorporating dust into dense and fast settling organic-rich aggregates. A good correspondence between BSi and dust fluxes was observed for the dusty year 2005, following a period of rather dry conditions in the Sahara/Sahel region. Large changes of all bulk fluxes occurred during the strongest El Niño-Southern Oscillation (ENSO) in 1997-1999 where low fluxes were obtained for almost 1 year during the warm El Niño and high fluxes in the following cold La Niña phase. For decadal timescales, Bakun (1990) suggested an intensification of coastal upwelling due to increased winds ("Bakun upwelling intensification hypothesis"; Cropper et al., 2014) and global climate change. We did not observe an increase of any flux component off Cape Blanc during the past 2 and a half decades which might support this. Furthermore, fluxes of mineral dust did not show any positive or negative trends over time which might suggest enhanced desertification or "Saharan greening" during the last few decades.

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Section: Carbonate Fluxes and Potential Enso Teleconnectionsmentioning

confidence: 85%

Section: Influence Of the Nao On Biogenic Silica Sedimentationmentioning

confidence: 86%

Section: Interaction Between Mineral Dust and The Biological Pumpmentioning

confidence: 99%

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Deep ocean mass fluxes in the coastal upwelling off Mauritania from 1988 to 2012: variability on seasonal to decadal timescales

Fischer¹,

Romero²,

Merkel³

et al. 2016

Biogeosciences

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“…The overall SST trend in the Mediterranean over the past 80 years reflects the AMO dynamics, with the warm and cold phases corresponding to those in the North Atlantic and with a period of high SST beginning in the mid 1990s (Marullo et al, 2011;Alheit et al, 2014). Using the magnitude squared coherence, which measures the association and linearity among stationary processes (Wang et al, 2004), it has been shown that all Atlantic time series (NAO, AMO, subpolar gyre, SST, subtropical gyre SST) are significantly coherent with the Mediterranean SST time series (Marullo et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the true contribution of the Lessepsian species to the MTC can be unmasked. In addition, we tested for the effect of large-scale climatic variability on MTC, by examining the effect of North Atlantic Oscillation (NAO) and Atlantic Multidecadal Oscillation (AMO) that have a specific periodicity and have been reported to affect the biomass of some Mediterranean fish stocks (Alheit et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Mean temperature of the catch (MTC) in the Greek Seas based on landings and survey data

et al. 2015

Self Cite

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The mean temperature of the catch (MTC), which is the average inferred temperature preference of the exploited species weighted by their annual catch, is an index that has been used for evaluating the effect of sea warming on marine ecosystems. In the present work, we examined the effect of sea surface temperature (SST) on the catch composition of the Greek Seas using the MTC applied on the official catch statistics (landings) for the period 1970-2010 (Aegean and Ionian Seas) and on experimental bottom trawl survey data for 1997-2014 (southern Aegean Sea). The MTC of the landings for the study period increased from 11.8 to 16.2 • C in the Aegean Sea and from 10.0 to 14.7 • C in the Ionian Sea. Overall, the rate of MTC increase was 1.01 • C per decade for the Aegean and 1.17 • C per decade for the Ionian Sea and was positively related to SST anomalies in both areas. For the survey data, the increase of the MTC of the bottom trawl catch in the southern Aegean Sea was lower (0.51 • C per decade) but referred to a shorter time frame and included only demersal species. The change in MTC of official and survey catches indicates that the relative catch proportions of species preferring warmer waters and those preferring colder waters have changed in favor of the former and that this change is linked to SST increase, both internally [through the Atlantic Multidecadal Oscillation(AMO)] or externally (warming trend) driven.

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The effect of regional sea surface temperature rise on fisheries along the Portuguese Iberian Atlantic coast

Leitão

Maharaj

Vieira³

et al. 2018

Aquatic Conservation

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The environmental effects of climate change are expected to impact fisheries, and related economies, and represent a significant challenge for the development of government policy. The impact of ocean warming on fisheries yields is of particular concern. The effect of sea surface temperature (SST) on fisheries in three distinct biogeographic areas (north‐western, NW; south‐western, SW; and south, S) and different fleet sectors (trawl, seine, and multi‐gear) of the Portuguese coast was examined. The mean temperature of the catch (MTC) was applied to the official landings statistics to assess the effect of global warming on the exploited marine communities. MTC increased from 16.9, 16.7, and 17.4°C in 1989 to 17.9, 18.1, and 18.3°C in 2009, whereas the linear rate of MTC increase was 0.54, 0.49, and 0.70°C per decade in the NW, SW, and S regions, respectively. The increase of warmer species in fisheries landings is regional‐specific. The percentage increases in landings of warmer water species increased significantly from north to south: 5.1, 6.7, and 18% per decade in the NW, SW, and S, respectively. The results confirmed that ocean warming has affected the composition of fisheries landings (of warmer and colder species) in the three regions of the Portuguese coast. The results highlight the importance and urgency of considering the temperature‐induced shift in species distribution in fisheries management.

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Atlantic Multidecadal Oscillation (AMO) modulates dynamics of small pelagic fishes and ecosystem regime shifts in the eastern North and Central Atlantic

Cited by 68 publications

References 81 publications

Deep ocean mass fluxes in the coastal upwelling off Mauritania from 1988 to 2012: variability on seasonal to decadal timescales

Deep ocean mass fluxes in the coastal upwelling off Mauritania from 1988 to 2012: variability on seasonal to decadal timescales

Mean temperature of the catch (MTC) in the Greek Seas based on landings and survey data

The effect of regional sea surface temperature rise on fisheries along the Portuguese Iberian Atlantic coast

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