Royal Netherlands Institute for Sea Research
Royal Netherlands
Institute for Sea Research
Phone number
+31 (0)222 369 569
Guest researcher
  • Paleoclimate reconstruction
  • Organic geochemistry
  • Lipid biomarker analysis (GC-FID; GC-MS(-MS); UHPLC-MS; GC-IRMS)
  • Analytical method development
  • (Compound specific) stable isotope analysis

Dr. Marijke de Bar

Guest researcher


The reconstruction of past marine (and continental) climates by means of organic lipid biomarkers, since future climatic conditions can be better assessed if we have knowledge of past oceanic responses to climate perturbations. One of my main goals is the reconstruction of past seawater temperature variations, as this is an important boundary condition for identifying processes responsible for climate change. As part of my project, I mainly focus on long chain alkyl diols - lipid molecules produced by certain algae - which we can extract from seawater and marine sediments, and which can be used as indicators for past climatic conditions, such as sea surface temperature, upwelling intensity and terrigenous input into the marine realm.


64PE393 (HCC); R/V Pelagia North Atlantic transect from Mindelo (Cape Verde) to Barbados, 2014.



Bachelor in Earth Sciences; Utrecht University; The Netherlands (2009 - 2012).
Master in Climate Reconstruction (cum laude); Utrecht University; The Netherlands (2012-2014).

KNAW Academy assistanship - laboratory/research trainee in organic geochemistry at Utrecht University (2011-2012).

12th Urbino Summer School in Paleoclimatology (2015).



de Bar, M.W.; Hopmans, E.C.; Verweij, M.; Dorhout, D.J.C.; Sinninghe Damsté, J.S.; Schouten, S. (2017). Development and comparison of chromatographic methods for the analysis of long chain diols and alkenones in biological materials and sediment. J. Chromatogr. A. 1521: 150-160.

Balzano, S.;Villanueva, L.; de Bar, M.W., Sinninghe Damsté, J.S.; Schouten, S. (2017). Impact of culturing conditions on the abundance and composition of long chain alkyl diols in species of the genus Nannochloropsis. Org. Geochem. 108: 9-17.

de Bar, M.W.; Dorhout, D.J.C.; Hopmans, E.C.; Rampen, S.W.; Sinninghe Damste, J.S.; Schouten, S. (2016). Constraints on the application of long chain diol proxies in the Iberian Atlantic margin. Org. Geochem. 10: 184–195.



From left to right: CTD deployment on board of the R/V Pelagia to collect seawater from different depths in the water column; collecting filters from in-situ pumps; filtering CTD water over different porosities; lipid extract separation by means of aluminium oxide column chromatography.



Linked news

Monday 20 May 2019
Langeketendiolen kunnen goede proxy’s zijn voor zeewateroppervlakte-temperatuur en opwelling
Het promotieonderzoek van Marijke de Bar toont aan dat langeketendiolen goede proxy’s zijn voor zeewateroppervlakte-temperatuur en opwelling. Echter, er zijn verschillende factoren die de toepassing van deze proxy’s beperken. Zo blijkt de proxy voor…

NIOZ publications