@article{fdi:010009765,
  title = {{S}pringtime sensible heat, nutrients and phytoplankton in the northwater {P}olynya, {C}anadian {A}rctic},
  author = {{L}yn {L}ewis, {E}. and {P}onton, {D}ominique and {L}egendre, {L}. and {L}eblanc, {B}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ampling was conducted in the {N}orthwater {P}olynya (between 70°20' and 77°20'{N}), on 17 and 19 {M}ay 1991. {A}t each of the 14 sampling stations, {CTD} profiles were recorded from surface to bottom and nutrients and phytoplankton were determined at four depths down to 30 m. {T}he presence, between 220 and 400 m, of water temperatures > 0°{C} is an indication that, in winter, the {W}est {G}reenland {C}urrent enters the {N}orthwater along the {G}reenland coast. {T}he worm water is progressively mixed as it moves northward and eastward. {I}t was thus hypothesized that sensible heat is as an important factor in keeping the {N}orthwater open. {M}easured chemical and biological variables were quite homogeneous on the vertical down to 30 m and they showed longitudinal gradients. {F}rom east to west, the average concentrations of nutrients increased (phosphate from 0.5 to 1.4, nitrate from 3.7 to 10.8, and silicate from 6.8 to 34.2 mmol/m3), whereas the areal concentrations of phytoplankton decreased (from 47 to 9 x 10 to the ninth power cells/m2 and from 506 to 50 mg {C}hla/m2). {N}utrient ratios indicated possible silicon deficiency in the easternmost part of the polynya. {D}iatoms dominated cell numbers (greater or equal to 87% at all stations). {C}oncentrations of the three nutrients were inversely correlated with both {C}hla and cell numbers. {T}he {Y}-intercepts of regressions of {C}hla on nutrients provided an estimate of potential maximum biomass in the upper 30 m, which was ca. 600 mg {C}hla/m2, or lower if there was silicon limitation. {T}he overall picture was that of a diatom bloom, moving westward and progressively exhausting the nutrients. {I}nitiation of the bloom appeared to have been linked to the absence of sea ice. {A} source of heat for this would have been the above sensible-heat process. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{MILIEU} {MARIN} ; {ECOSYSTEME} ; {TEMPERATURE} ; {SALINITE} ; {CHLOROPHYLLE} ; {MATIERE} {ORGANIQUE} {PARTICULEE} ; {AZOTE} ; {PHYTOPLANCTON} ; {CANADA} ; {ARCTIQUE}},
  booktitle = {},
  journal = {{C}ontinental {S}helf {R}esearch},
  volume = {16},
  numero = {14},
  pages = {1775--1792},
  ISSN = {0278-4343},
  year = {1996},
  DOI = {10.1016/0278-4343(96)00015-5},
  URL = {https://www.documentation.ird.fr/hor/fdi:010009765},
}