1 / 9

Measurements of the carbonate system properties

Measurements of the carbonate system properties. Franck Touratier & Catherine Goyet Lab. IMAGES Université de Perpignan Via Domitia. Global warming. Stratification Circulation. Greenhouse effect. ?. Inorganic Carbon Chemistry. Organic Carbon Biology. ?. Anthropogenic CO 2.

marvel
Download Presentation

Measurements of the carbonate system properties

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Measurements of the carbonate system properties Franck Touratier & Catherine Goyet Lab. IMAGES Université de Perpignan Via Domitia

  2. Global warming Stratification Circulation Greenhouse effect ? Inorganic Carbon Chemistry Organic Carbon Biology ? Anthropogenic CO2 Acidification

  3. Scientific background: • Measurements of CT and AT during the WOCE program

  4. Concerning the MediterraneanSea … • Why the Med. Seaissointeresting? • 1) Because the Med. Seaischaracterized by a veryhighanthropogenic pressure; 2) the ventilation of the deep waters isvery intense; 3) Someconsequences of the climate change has been observed (EMT); 4) itisbelievedthat the level of Cant (and consequently the acidification level) is one of the highest in the world ocean; 5) The Med. Seaacts as a source of C for the Atlantic. • OverallObjective:is to build up a database of the carbonate system properties (CT, AT, pH, pCO2) for the whole Med. Sea in order to • 1) estimate Cant sequestrationefficiency; and 2) to estimate the level of acidification  the potential impact(s) on the biology. • A serious limitationcomesfrom a verypoor data coverage in thisregion! For instance, in the Medatlasdatabase : CT data are absent and there are large uncertainties on AT. • One objective of IMAGES is to gatheravailable data of good quality, to acquire new samples, and performaccuratemeasurements of the CO2/carbonate system.

  5. . . . . SARHYGOL Feb-Dec/2001 . BOUSSOLE/AOPEX Jul-Aug/2004 . METEOR 51/2 Oct-Nov 2001 (University of Kiel, Germany) .Cruises off Alger (ISMAL) 2006 . EMED-BIOPT Sept/2006 . SEMANE Jul/2002 .TSS DYFAMED & SOLA . RHOFI Jul/2003

  6. 2) Scientific objectives: I.To extend our knowledge on the distribution of the properties of the carbonate system using measurements of CT and AT II. To estimate Cant (TrOCA approach; Touratier et al., 2007) and acidification level (pH)  local estimation with lowered uncertainties, S AT  Cant pH O2 CT III. To estimate at the global Mediterranean scale Cant (TrOCA) and acidification using an interpolation procedure from S, , and O2 (Goyet and Davis, 1997) . CT = a + bS + c + dAOU; AT = f (S)

  7. EMED-BIOPT 2006 CT (µmol.kg-1) AT (µmol.kg-1) Cant (µmol.kg-1) pH

  8. 3) How to reachthese objectives: • Samples for AT and CT should be collected from surface to the bottom, but preferentially below the MLD, • In order to estimate Cant and pH, the O2 concentration should be measured in the same samples. 4) Specificneeds on board: • Space on board to store samples: •  number of samples must be first estimated • 20 samples/box  each box is 0.072 m3 • Ideal temperature for storage is 4°C but samples may support higher temperatures (5-25°C) for several weeks. • The room for storage should be situated close to the CTD deck • Each sample requires 1.5 litre of seawater and samples must be collected just after those for oxygen analysis to minimize CO2 exchanges.

More Related