FN Archimer Export Format
PT J
TI Atmospheric forcing on the annual iron cycle in the western Mediterranean Sea: A 1-year survey
BT 
AF BONNET, Sophie
   GUIEU, Cecile
AS 1:1;2:1;
FF 1:;2:;
C1 Lab Oceanog Villefranche, F-06238 Villefranche Sur Mer, France.
C2 LAB OCEANOG VILLEFRANCHE, FRANCE
IF 2.8
TC 98
UR https://archimer.ifremer.fr/doc/00240/35098/33593.pdf
LA English
DT Article
CR MELISSA 2004
BO Téthys II
AB A 1-year survey of simultaneous measurements of total atmospheric deposition and dissolved iron concentrations in surface waters (0-40 m) was performed in the northwestern Mediterranean Sea, an area with a marked seasonal hydrological regime. The total atmospheric iron flux was 1118 mg m(-2) (i.e., 20.4 mmol m(-2)). By using aluminium as a crustal marker the deposition was mainly attributed to Saharan dust deposition. Dissolved iron flux was estimated to be 42 mmol m(-2) yr(-1), of which 44% was anthropogenic in origin and 56% was of Saharan origin. Dissolved iron profiles revealed four typical situations throughout the year: (1) a winter situation with homogenous dissolved iron concentrations ranging from 0.8 to 0.9 nmol L(-1), (2) a spring situation with uniformly low concentrations ranging from 0.2 to 0.5 nmol L(-1), (3) a summer situation with enriched surface waters up to 1.2 nmol L(-1), and (4) an autumnal situation with homogenous concentrations ranging from 0.9 to 1.1 nmol L(-1). The results demonstrate that the iron enrichment in the mixed layer observed during the stratified period was of the same order of magnitude as the cumulative atmospheric inputs for the same period. The seasonal variability of dissolved iron (DFe) concentrations in surface waters was driven by a combination of factors, including aeolian Fe deposition, nature of aerosols, vertical mixing, phytoplankton uptake, and particle scavenging. Iron distribution can have a clear biogeochemical effect on the autotrophic communities: The low Fe: P ratio observed during the bloom indicates a possible iron limitation for phytoplankton, and the dissolved iron enrichment during summer is certainly at the origin of the development of diazotrophs populations in the system.
PY 2006
PD SEP
SO Journal Of Geophysical Research-oceans
SN 0148-0227
PU Amer Geophysical Union
VL 111
IS C9/C09010
UT 000240422200002
BP 1
EP 13
DI 10.1029/2005JC003213
ID 35098
ER

EF