Organic carbon at marine interfaces

  • Glyoxal has been detected over the open ocean by MAX-DOAS and CE-DOAS instruments on ships.
  • It is a good tracer for the oxidative capacity in the marine boundary layer (MBL), as it is a sink for OH and tropospheric O3, which modifies the reactive chemistry and lifetime of climate active gases, e.g. CH4.
  • Flux measurements are made over the open ocean with the CE-DOAS instrument to determine if the ocean is a glyoxal source or sink. This data is also used to retrieve diurnal profiles of glyoxal over the ocean.

First detection of glyoxal over the remote ocean in the marine boundary layer during VOCALS-Rex/TAO 2008/2009.

Glyoxal flux measurements as a function of solar zenith angle (proxy for time) during TORERO.

Diurnal cycles of CHOCHO over the Eastern Pacific Ocean measured during TORERO.