Enhancing the comprehension of mixed layer depth control on the Mediterranean phytoplankton phenology

Lavigne, Héloïse; D’Ortenzio, Fabrizio; Migon, Christophe; Claustre, Hervé; Testor, Pierre; d’Alcalà, Maurizio Ribera; Lavezza, R.; Houpert, Loïc; Prieur, Louis

doi:10.1002/jgrc.20251

Cited by 74 publications

(123 citation statements)

References 67 publications

(116 reference statements)

Supporting

Mentioning

107

Contrasting

Order By: Relevance

“…Secondly, and as a consequence of the climatogical scale, the DR09 trophic regimes and bioregions could be an artifactual result of the climatological average, which, by flattening the seasonal cycle of surface chlorophyll a, could have generated unrealistic seasonal cycles of phytoplankton. This point, already evoked by the authors, is particularly relevant for the "Intermittently" trophic regime of DR09 (see also the discussion on the "Intermittently" DR09 trophic regime in Lavigne et al, 2013).…”

Section: Introductionmentioning

confidence: 61%

“…More recently, Lavigne et al (2013) demonstrated the absence of light limitation in the "No Bloom" areas, confirming that the winter increase of [Chl] surf is likely related to relatively small nutrient inputs, as a consequence of MLD deepening. However, in winter the daily photosynthetically available radiation (PAR) at sea surface is also reduced.…”

Section: The "No Bloom" Trophic Regimesmentioning

confidence: 68%

“…Therefore, the resulting regime should be an artifact of the climatological approach of DR09. More recently, the interannual switch between the "Bloom" and "No Bloom" regimes over the "Intermittently #4" area was partially confirmed using in situ estimations of the MLD, although the number of observations was too scarce to draw any conclusions at the basin scale (Lavigne et al, 2013).…”

Section: "Intermittently #4" Trophic Regimementioning

confidence: 96%

“…The Rhodes Gyre is known to be the region of formation of the Levantine Intermediate Water (LIW), which is generated under specific atmospheric forcing conditions and in a permanent cyclonic structure (Wüstz, 1961). Phytoplankton blooms are sporadically observed from space (D'Ortenzio et al, 2003;Volpe et al, 2012), although the link between LIW formation events and phytoplankton enhancement was only hypothesized (Lavigne et al, 2013). The link between bioregions and dense water formation events is not clear in the Rhodes gyre region.…”

Section: "Intermittently #4" Trophic Regimementioning

confidence: 99%

“…The DR09 results have already been used to investigate the role of the mixed layer depth (MLD) and the nitrate distribution on the Mediterranean phytoplankton phenology (Lavigne et al, 2013), while modeling studies have used the DR09 bioregionalization based on the seasonal dynamics of phytoplankton to ameliorate the primary production estimates from space (Uitz et al, 2012). Combining temporal (i.e., the trophic regimes) and spatial (i.e., the bioregions) analysis, the DR09 results thus provided a robust framework to identify the role of abiotic and biotic factors on the Mediterranean phytoplankton phenology.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Interannual variability of the Mediterranean trophic regimes from ocean color satellites

et al. 2016

Self Cite

View full text Add to dashboard Cite

Abstract. D'Ortenzio and Ribera d'Alcalà (2009, DR09hereafter) divided the Mediterranean Sea into "bioregions" based on the climatological seasonality (phenology) of phytoplankton. Here we investigate the interannual variability of this bioregionalization. Using 16 years of available ocean color observations (i.e., SeaWiFS and MODIS), we analyzed the spatial distribution of the DR09 trophic regimes on an annual basis. Additionally, we identified new trophic regimes, exhibiting seasonal cycles of phytoplankton biomass different from the DR09 climatological description and named "Anomalous". Overall, the classification of the Mediterranean phytoplankton phenology proposed by DR09 (i.e., "No Bloom", "Intermittently", "Bloom" and "Coastal"), is confirmed to be representative of most of the Mediterranean phytoplankton phenologies. The mean spatial distribution of these trophic regimes (i.e., bioregions) over the 16 years studied is also similar to the one proposed by DR09, although some annual variations were observed at regional scale. Discrepancies with the DR09 study were related to interannual variability in the sub-basin forcing: winter deep convection events, frontal instabilities, inflow of Atlantic or Black Sea Waters and river run-off. The large assortment of phytoplankton phenologies identified in the Mediterranean Sea is thus verified at the interannual scale, further supporting the "sentinel" role of this basin for detecting the impact of climate changes on the pelagic environment.

show abstract

Section: Introductionmentioning

confidence: 61%

Section: The "No Bloom" Trophic Regimesmentioning

confidence: 68%

Section: "Intermittently #4" Trophic Regimementioning

confidence: 96%

Section: "Intermittently #4" Trophic Regimementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Interannual variability of the Mediterranean trophic regimes from ocean color satellites

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

Observing mixed layer depth, nitrate and chlorophyll concentrations in the northwestern Mediterranean: A combined satellite and NO₃ profiling floats experiment

D’Ortenzio

Lavigne

Besson

et al. 2014

Geophys. Res. Lett.

Self Cite

View full text Add to dashboard Cite

Two profiling floats, equipped with nitrate concentration sensors were deployed in the northwestern Mediterranean from summer 2012 to summer 2013. Satellite ocean color data were extracted to evaluate surface chlorophyll concentration at float locations. Time series of mixed layer depths and nitrate and chlorophyll concentrations were analyzed to characterize the interplay between the physical-chemical and biological dynamics in the area. Deep convection (mixed layer depth > 1000 m) was observed in January-February, although high-nitrate surface concentrations could be already observed in December. Chlorophyll increase is observed since December, although high values were observed only in March. The early nitrate availability in subsurface layers, which is likely due to the permanent cyclonic circulation of the area, appears to drive the bloom onset. The additional nitrate supply associated to the deep convection events, although strengthening the overall nitrate uptake, seems decoupled of the December increase of chlorophyll.

show abstract

Phytoplankton phenology in the coastal upwelling region off central‐southern Chile (35°S–38°S): Time‐space variability, coupling to environmental factors, and sources of uncertainty in the estimates

et al. 2015

View full text Add to dashboard Cite

The annual cycle and phenology of phytoplankton (satellite-derived chlorophyll-a, Chl-a) in the coastal upwelling region off central-southern Chile, their time-space variation, the extent of their coupling with those of wind-driven upwelling (as Zonal Ekman Transport, ZET), Sea Surface Temperature (SST), and Photosynthetically Active Radiation (PAR) were analyzed using a 10 year satellite time series (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012). Wavelet analysis (WA) was applied to extract the dominant frequencies of variability and their recurrence, to derive the phenological indexes, and to assess the extent of the coupling between Chl-a and environmental forcing in the annual frequency. Index estimates were obtained from minimum and maximum accumulated values in two different frequency bands, annual (WA-ANF) and all except the synoptic (WA-ALF). The annual frequency was dominant in all the variables; however, the annual cycle and phenology of Chl-a displayed higher submeso and mesoscale variability. The mean onset date of Chl-a was similar to those of PAR and ZET with WA-ALF and cross WA indicated that, for the most part, their annual cycles were coupled or coherent. Few interannual changes in Chl-a phenology were detected, including a 1 month longer duration (WA-ALF) during La Niña 2010-2011. The mean anomalies in the magnitudes of Chl-a and ZET during the upwelling season showed a slight but significant trend, negative for Chl-a and positive for ZET, while SST remained relatively constant. This pattern was unexpected since three La Niña-related conditions were identified during the 2007-2012 period.

show abstract

Enhancing the comprehension of mixed layer depth control on the Mediterranean phytoplankton phenology

Cited by 74 publications

References 67 publications

Interannual variability of the Mediterranean trophic regimes from ocean color satellites

Interannual variability of the Mediterranean trophic regimes from ocean color satellites

Observing mixed layer depth, nitrate and chlorophyll concentrations in the northwestern Mediterranean: A combined satellite and NO₃ profiling floats experiment

Phytoplankton phenology in the coastal upwelling region off central‐southern Chile (35°S–38°S): Time‐space variability, coupling to environmental factors, and sources of uncertainty in the estimates

Contact Info

Product

Resources

About

Enhancing the comprehension of mixed layer depth control on the Mediterranean phytoplankton phenology

Cited by 74 publications

References 67 publications

Interannual variability of the Mediterranean trophic regimes from ocean color satellites

Interannual variability of the Mediterranean trophic regimes from ocean color satellites

Observing mixed layer depth, nitrate and chlorophyll concentrations in the northwestern Mediterranean: A combined satellite and NO3 profiling floats experiment

Phytoplankton phenology in the coastal upwelling region off central‐southern Chile (35°S–38°S): Time‐space variability, coupling to environmental factors, and sources of uncertainty in the estimates

Contact Info

Product

Resources

About

Observing mixed layer depth, nitrate and chlorophyll concentrations in the northwestern Mediterranean: A combined satellite and NO₃ profiling floats experiment