CURRENT PROJECTS

Mercury in the Arctic Ocean

 

GEOTRACES 2015

 

In early Spring 2015, I agreed to analyze mercury and methylmercury samples from the Arctic at the brand new BGC lab. We prepared and shipped the bottles to Norway.

Lars-Eric Heimb├╝rger collected hundreds of snow, ice and melt-water samples on-board the German Ice Breaker Polarstern.

Polarstern is now traveling back to Bremen (Germany) with the precious load. The samples will be shipped back to Harvard for analysis.

 

This cruise made history! Find out how here

 

 

Update: The samples are at ESL and will be analyzed in January -February 2016

 

September 2016: All the samples have been analyzed we are preparing the manuscript!

Methylmercury in estuaries

 

 

 

 

 

 

 

 

 

                                                                                                                                                       Tekran 2600           Helen Amos         Record breaking MeHg calibration          Plankton

 

 

In August 2014, we collected samples along the Northeastern USA shore

 

Water and plankton were collected at 12 stations in 5 estuaries.

 

In May 2015, at the newly set up BGC lab, I measured total mercury and methylmercury (MeHg) in the water and plankton collected during the cruise.

 

Helen Amos helped in the lab and took nice shots of plankton samples.

 

The data is interesting and I look forward to presenting it at the ICMGP 2015.

 

Mercury and Methylmercury in Lake Melville, Labrador

 

Biogeochemistry Component

 

My goal is to establish a baseline for mercury cycling and methylmercury concentration in the system and fish consumed by the native Inuit population. Using  experimental work and geochemical modeling, I am  investigating how the damming of the main tributary will affect mercury cycling and fish concentration. The initial phase of the project (2012-2013) consisted of 2 sampling expeditions to measure mercury species (elemental, organic and inorganic) and ancillary data in the air, sediment and water of the estuary and its major tributaries.

 

This paper is out!

 

Human Component

 

We are collecting hair and diet information with the help of our partners on the ground.

A first batch of hair samples has arrived and is being analyzed for mercury by Amelia Valberg and Ryan Calder.

This paper is out!

Fish Component

 

Fish consumption  is the primary source of methylmercury to humans and marine mammals. I measure methylmercury  and mercury isotopes in Lake Melville fish , as well as several ancillary parameters to identify the origin of the methylmercury found in the fish.

 

Ultimately, the biota data will be incorporated into a bioaccumulation model for Lake Melville.

 

Update:

2014: I analyzed the 1st batch of fish

2015: 2nd batch has been received and is being analyzed by Miling Li.

This paper is out!