FN Archimer Export Format
PT J
TI Spatio-temporal variability of a chlorophyll-a based biomass index and influence of coastal sources of enrichment in the Algerian Basin
BT 
AF Harid, Romaissa
   Demarcq, Herve
   Keraghel, Mehdia-Asma
   Ait-Kaci, Malik
   Zerrouki, Mohamed
   Bachari, Nour-El-Islam
   Houma, Fouzia
AS 1:1,2;2:2;3:1;4:1;5:1;6:3;7:1;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 ECOSYSMarL: Laboratoire des Écosystèmes Marins et Littoraux, École Nationale Supérieure des Sciences de la Mer et de l’Aménagement du Littoral (ENSSMAL), Campus Universitaire de Dely Ibrahim Bois des Cars, B.P. 19, 16320, Alger, Algeria
   MARBEC, IRD, Ifremer, CNRS, Univ Montpellier, Sète, Avenue Jean Monnet, CS 30171, 34203, Sète cedex, France
   USTHB: Université des Sciences et Technologie Houari Boumedien, Département Écologie et Environnement, BP 32 Bab Ezzouar, 16111, Alger, Algeria
C2 ENSSMAL, ALGERIA
   IRD, FRANCE
   UNIV HOUARI BOUMEDIENE, ALGERIA
UM MARBEC
IN WOS Cotutelle UMR
   copubli-int-hors-europe
   copubli-sud
IF 2.3
TC 8
UR https://archimer.ifremer.fr/doc/00740/85165/90248.pdf
LA English
DT Article
CR SOMBA-GE-2014
BO Téthys II
DE ;Ocean colour;Alongshore variability;Wadi;Anthropic enrichment;MODIS
AB This study investigates the spatial distribution and temporal variability of chlorophyll-a (Chl-a) biomass in the Algerian Basin (AB) along its meridional and cross-shore dimensions, focusing on coastal enrichments. After correcting most atmospheric disturbances in the daily MODIS Level-2 data series between 2003 and 2018, a fortnightly climatology of 1-km resolution Chl-a has been generated to account for specific coastal features previously poorly evidenced from 4-km Level-3 data. The AB is characterised by two extreme seasons of high and low biomass, separated by sharp transitions, that characterise the offshore domain. The coastal area (<10 km) reveals an intense and distinct dynamic associated with highly productive local hotspots rather than seasonal variability. A biomass index is proposed as the horizontally integrated Chl-a concentration from the coastline to the most offshore extension of the 0.5 mg m-3 Chl-a isopleth. This index separately quantifies the cumulative biomass of both offshore and coastal domains with large alongshore variability. Low values (<5 g m-2) were observed in the offshore area during summer and high values during the spring blooms (up to 40 g m-2), while maximum values (>50 g m-2) were locally observed in the coastal domain. The narrow coastal area alone represents 44% of the total biomass, with coastal hotspots where the enrichment is up to 5 times higher than offshore. Multivariate modelling of the potential factors favouring coastal enrichments shows that the phytoplanktonic biomass in coastal waters is mainly associated with enrichments from wadis and seasonally from city sewage as well as by the presence of a bay. A separate source of enrichment is undoubtedly associated with the presence of aquaculture cages. 
PY 2022
PD JAN
SO Continental Shelf Research
SN 0278-4343
PU Elsevier BV
VL 232
UT 000792572700004
DI 10.1016/j.csr.2021.104629
ID 85165
ER

EF