Dr. Jennifer Clarke

Postdoctoral Researcher

Room: 12-322
Phone: +49-431 600 1295
E-Mail: jclarke (at) geomar.de
GEOMAR | Helmholtz Centre for Ocean Research Kiel
East shore campus
Wischhofstrasse 1-3
24148, Kiel


2015 : PhD, University of Southampton, Ocean and Earth Sciences

"Characterisation of pH and pCO2 optodes towards high resolution in situ ocean deployment"

2011: MChem, University of Southampton, Chemistry with Ocean and Earth Sciences

"Oxygen Microelectrodes: Improving the measurement technique" with Guy Denuault

Research Interests

I am interested developing and deploying in situ sensors to characterise ocean processes. My work is developing and deploying optodes for in situ pCO2 and pH measurements with the ultimate aim to get the systems on gliders and moorings in a variety of locations (both coastal and open ocean).

My recent and on-going research investigates:

  • Characterisation of pH and pCO2 optodes
  • The influence of freshwater on arctic and sub-arctic environments
  • Biogeochemistry of Eddies in the South Atlantic


Clarke, J. S. et al., 2015, Characterisation and deployment of an immobilised pH sensor spot towards surface ocean pH measurements, Analytica Chimica Acta, (897), 69-80

Tynan, E., Clarke, J. S. et al, 2016,  Physical and biogeochemical controls on the variability in surface pH and calcium carbonate saturation states in the Atlantic sectors of the Arctic and Southern Oceans, Deep Sea Research II,(127), 7-27

Clarke, J. S. et al., 2017, Developments in marine pCO2 measurement technology; towards sustained in situ observations, TrAC Trends in Analytical Chemistry (88), 53-61


  • 2016   RV 'Meteor' (M124), AtlantOS, South Atlantic
  • 2014  RRS James Clark Ross (JR302), RAGNARoCC and OSNAP, Subpolar North Atlantic
  • 2013   RRS James Cook (JC086), Extended Ellett Line, North Atlantic

  • 2013   RRS James Clark Ross (JR274), UK Ocean Acidification Research Cruise, Southern Ocean