Research

Current Projects

Inorganic and organic Hg cycling in ocean & atmosphere

I use the GEOS-Chem model to improve our understanding of mercury dynamics in the ocean and atmosphere with a focus on air-sea exchange.

I improved the representation of inorganic seawater mercury cycling in the GEOS-Chem mercury model. I am currently working on implementing methylated mercury cycling in the model. This is done with a focus on the Arctic and the possible effect of global change.

This work is done together with Elsie SunderlandDaniel JacobJenny FisherYanxu ZhangHelen Amos, and Hannah Horowitz.

Publications: Soerensen et al. 2010b; 2014b (in prep); Fisher et al. 2012; 2013

 

GEOS-Chem surface ocean conceptual Hg cycling

GEOS-Chem surface ocean conceptual Hg cycling

Seasonal, spatial, and decadal trends of Hg

I use Hg cruise data collected by myself and others to explore spatial, seasonal, and decadal trends in Hg in the surface ocean and marine boundary layer. This work is done together with Elsie SunderlandDaniel Jacob and Robert Mason

Publications: Soerensen et al. 20122013; 2014a; Witt et al. 2014


Future Projects

Mercury cycling and bioaccumulation in the Baltic Sea

In the summer 2014 I will relocate to ITM, Stockholm University, Sweden. I will work on mercury in the Baltic Sea with a focus on methylmercury cycling and bioaccumulation. The project will be a combination of experimental work and modeling. We want to get an understanding of the current status of Hg in the Baltic Sea and understand how changes in anthropogenic emissions and global warming affect trends of Hg in seawater and biota.

The work is done in collaboration with Ian Cousin and Emma Undeman at Stockholm University, Erik Bjorn at Umeå University, and Ulf Skyllberg at SLU.


Past Projects

The location of the Danish research stations Station Nord and Nuuk. Atmospheric Hg0 is continuously measured at Station Nord today.

The Danish research stations Station Nord and Nuuk. Atmospheric Hg(0) is continuously measured at Station Nord.

Hg and Br chemistry in DEHM (2011-2013)

I updated the Danish Eulerian Hemispheric Model (DEHM) with secondary Hg emissions (snow, biomass burning, and ocean evasion)  with a focus on the Arctic. Sissal Erenbjerg (MSc. student) continued this work and implemented halogen chemistry in the model. She looked at the effect on Hg and ozone. I co-supervised Sissal with Jesper Christensen (Aarhus University), Ole John Nielsen (University of Copenhagen).

 

Atmospheric Hg0 & HgII: a world wide cruise (2008-2011)

Cruise observations and GEOS-Chem model simulation of atmospheric Hg0 released from biomass burning in Australia (from PhD-thesis)

Observations and GEOS-Chem model simulation of atmospheric Hg(0) released from Australian biomass burning.

Part of my Ph.D. project was to analyze atmospheric Hg data from a worldwide cruise (Galathea 3 cruise). Hg(0) and Hg(II) were measured continuously with a Tekran 2537A mercury vapor analyzer equipped with a Tekran 1130 unit. Measurements were available for 114 days. My main Ph.D. supervisors were  Henrik Skov and Marianne Glasius (Aarhus University).

Publications: Soerensen et al., 2010a; 2010c

 

Long Range Transport of Nitrogen tn High Arctic Tundra (2006-2007)

Average yearly nitrogen deposition at Zackenberg as simulated by the DEHM model. Past, present and future scenarios are shown (from MSc thesis)

Average yearly nitrogen deposition at Zackenberg as simulated by the DEHM model (from MSc thesis)

I looked at the influence of anthropogenic nitrogen deposition on tundra ecosystems with a focus on Zackenberg, Greenland. The DEHM (Danish Eulerian Hemispheric Model) was used to look at the atmospheric transport to the area in past, present and future. Furthermore a nitrogen budget for two tundra types in the Zackenberg area was created. This work was done with Jesper Christensen (National Environmental Research Institute) and Helge Ro-Poulsen (Copenhagen University).


General research topics that have my interest

 

Leaving my computer for a short while to go into the field for the first time

Leaving my computer for a short while to go into the field for the first time

  • Air-sea exchange of soluble gasses
  • Spatial and temporal trends of pollutants
  • Persistent pollutants in the Arctic
  • Model development
  • Inorganic and organic mercury in the marine boundary layer and ocean