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Project: GEOTRACES - Geotraces, Global Change and Microbial Oceanography in the West Atlantic Ocean

Project details

Full project name : Geotraces, Global Change and Microbial Oceanography in the West Atlantic Ocean
Initiating organisation : NIOZ Royal Netherlands Institute for Sea Research, Texel
Project leader : H. J. W. de Baar
Supporting organisation(s)Royal Netherlands Meteorological Institute (KNMI)
Financing : nwo
Project number : 83908410
Start date : Jan 01, 2009
End date : Dec 31, 2014


Programme :ZKO - Oceans - National Programme Sea and Coastal Research - Oceans
Main project :-


Description :

Re-visiting in 2009-2010 of West Atlantic GEOSECS-1972 produces complete ocean sections of (A) novel trace elements and several isotopes, (B) transient tracers of global change, (C) microbial biodiversity and metabolism, and (D) interpretation by ocean modeling where the ocean observations A-C serve for verification of the models. Many of these ''tracers in the sea'' will be first-ever ocean sections (sub-projects A, (B), C), while others (sub-project B) will allow unraveling of transient global changes over the past ~35 years by comparison with data of 1972-1973 GEOSECS and later cruises (notably 1981-1983 TTO, WOCE 1990''s; CLIVAR).

A) The first-ever high resolution (24 depths at every degree) Atlantic deep section of trace metals Fe, Al, Zn, Mn, Cd, Cu, Co, Ni, Ag will be done, in conjunction with lower resolution sampling for Ba, Rare Earths, natural isotopes 234Th, 230Th, 231Pa, 223Ra, 224Ra, 226Ra, 228Ra, 227Ac and anthropogenic isotopes 129I, 99Tc, 137Cs, 239,240Pu, 238Pu.

B) Water masses, circulation and mixing are defined by classical S,T,p combined with datasets of dissolved nutrients and O2, as well as transient tracers DIC, CFCs, novel SF6, 3H/3He and 13CO2, 14CO2 also to derive ''ages'' of a water mass. The invasion of transients is mostly in the North Atlantic Ocean and partly overlaps with warming of upper ocean waters, and with the increase of CO2 inventory, hence ocean acidification.

C) Biodiversity, abundance and metabolic rates of microbes (eukaryotes, prokaryotes and viruses) will be determined in the meso- and bathypelagic ocean. Particularly, the role of chemoautotrophy in the deep ocean will be investigated as it might represent a thus far unrecognized source of dark ocean ''primary productivity''.

D) The above datasets A,B,C are in mutual support and moreover combine to serve for Ocean Biogeochemical Climate Modeling towards more rigorous, integrated understanding of processes including the role of the Atlantic Ocean in global change.


Source: NWO