SEASONAL IRON DISTRIBUTIONS AND SPECIATION IN SEASONAL IRON DISTRIBUTIONS AND SPECIATION IN THE ATLANTIC OCEANTHE ATLANTIC OCEAN

S.J. Ussher1*, E.P. Achterberg2 and P. J. Worsfold1

1. School of Earth, Ocean and Environmental Sciences (SEOES), University of Plymouth, Drake Circus, Plymouth, UK

2. National Oceanography Centre, University of Southampton, European Way, Southampton, UK

*sussher@plymouth.ac.uk

Atlantic Meridional Transect (AMT)1995-2007, 17 research cruises. Biannual-annual time-series

Data available- British Oceanographic Data Centre (BODC).

Southampton, UK - Capetown,

South Africa, Sept-Oct 2004

(Upwelling Data Excluded)

Capetown, South Africa - Falmouth,

UK May-Jun 2005

AMT 15 AMT 16

Glasgow, UK – Port Elizabeth,

South Africa, Oct- Nov 2005

AMT 17

Surface water (5 m)

AMT 15-17 Surface dissolved Fe (<0.2 um)

0.0

0.4

0.8

1.2

1.6

34

35

36

37

38

-50 -40 -30 -20 -10 0 10 20 30 40 50 -50 -40 -30 -20 -10 0 10 20 30 40 50 -50 -40 -30 -20 -10 0 10 20 30 40 50

10

15

20

25

30

35

Te

mp

era

ture

(ºC

)

Sa

lin

ity

DF

e (

nM

)

Latitude (ºN)

AMT 15 Sept-Oct 2004 AMT 16 May-Jun 2005 AMT 17 Oct- Nov 2007

AMT 16 Dissolved iron data (May - June 2005, 0-300 m, 35ºS-50ºN)

ACKNOWLEDGEMENTS

Personal thanks

Matthieu Waeles and Ed MawjiOfficers and crew of the RSS Discovery

UKORS staff at NOC British Oceanographic Data Centre

Natural Environment Research Council for funding this project under research grant NER/A/S/2003/00489.

Atlantic Meridional Transect Consortium (NER/0/5/2001/00680).