Walker lab in the press


Aug. 22nd, 2022: Our successful CFI-MSI proposal is highlighted on CBC's All in a Day

The segment entitled "What does $5,845,254 get a mass spectrometer?" can be listened to here

June 15th, 2022: PI Walker successfully renews Canada Foundation for Innovation Major Scientific Initiatives grant for the AEL-AMS Lab!

We are delighted to have led André E. Lalonde AMS facilities next Major Scientific Initiatives proposal. The funding will be used for operation and maintenance of the facility through 2029. PI Walker will act as the Scientific Leader of the facility during this time. It's been a long road, with the proposal originally submitted in Fall 2021 and defended in a 3 day oral session with International AMS experts. What a wonderful result!

May 23rd, 2022: Congratulations Aislinn on publishing your Baffin Bay POM paper!

So excited for your first contribution of many. The article was recently published in Frontiers in Marine Science. It can be found here: Fox A and Walker BD (2022) Sources and Cycling of Particulate Organic Matter in Baffin Bay: A Multi-Isotope δ13C, δ15N, and Δ14C Approach. Front. Mar. Sci. 9:846025. doi: 10.3389/fmars.2022.846025

April 27th, 2022: Congratulations Sara on publishing your Baffin Bay DIC paper!

Sara's MSc thesis was publshed in Frontiers in Marine Science!
Zeidan S, Walker J, Else BGT, Miller LA, Azetsu-Scott K and Walker BD (2022) Using Radiocarbon Measurements of Dissolved Inorganic Carbon to Determine a Revised Residence Time for Deep Baffin Bay. Front. Mar. Sci. 9:845536. doi: 10.3389/fmars.2022.845536

January 25th, 2022: Our recent review paper on Marine Radiocarbon was published

The paper was led by the esteemed Dr. Ellen Druffel, so wonderful to collaborate on this with you!

Ellen R. M. Druffel, Steven R. Beaupré, Hendrik Grotheer, *Christian B. Lewis, Ann P. McNichol, Gesine Mollenhauer and Brett D. Walker. (2022) Marine Organic Carbon and Radiocarbon – Present and Future Challenges. Radiocarbon, 1-17. doi:10.1017/RDC.2021.105.

November 17th, 2021: Sara successfully defends her MSc thesis!

Congratulations to MSc Zeidan on your defense and best of luck starting your new job at Health Canada! It has been a pleasure working with you and you will be sorely missed in the Walker Lab. It was wonderful to get the team together in person for the first time to celebrate properly (with cake) on Saturday.

October 1-3, 2021: Walker Lab participates in the international WHOI/OCB Carbon Isotope Workshop

We were honored to participate in the WHOI/OCB dissolved inorganic carbon workshop this week. The focus on the event was to get the marine carbon isotope community together to communicate state of the art methods and to work towards developing community reference materials (CRMs) for standardizing DIC 13C and 14C measurements.

September 13th, 2021: A new (mini) AMS in town

The André E. Lalonde AMS lab recieved its Mini Carbon Dating System (MICADAS) today. The Walker Lab can't wait to measure it's ultra-small samples in-house!

September 7th, 2021: Team departs on 4338 nauthical mile journey through the Northwest Passage !

MSc students Kayla, Liam and Aislinn successfully completed a 4 week cruise in the Canadian Arctic, sampling all major carbon reservoirs for isotopic and chemical characterization. This was part of our NSERC funded shiptime application: Radiocarbon Distributions and Carbon Cycling between Baffin Bay and the Beaufort Sea (RadCARBBS).

August 4th, 2021: New toys! Walker lab recieves its Postnova Asymmetric Flow Field-Flow Fractionation System!

It's been a long road getting the new A4F system purchased and installed in the Walker Lab. We look forward to using this new tool to better constrain the size-age-composition and reactivity continuums of marine organic matter.

July 26th, 2021: Aislinn presents on Baffin Bay POM 14C cycling at the 3rd International Radiocarbon in the Environment Conference!

Congratulations Aislinn on your very first presentation. Your talk was very well recieved and it's wonderful to see what can come out of an honors BSc thesis! Her talk was entitled "Evaluating sources and cycling of particulate organic carbon in Baffin Bay: A 14C and 13C approach".

June 26th, 2021: Sara Zeidan presents her work at the 2021 ASLO Meeting

Congratulations Sara for presenting your first talk at an international conference: "Radiocarbon and stable carbon signatures of DIC in Baffin Bay Seawater".

May 25th, 2021: Dissolved Organic Radiocarbon in the Eastern Pacific and Southern Oceans published !

The Druffel Lab's DO14C work from the GO-SHIP P18 cruise was recently published in Geophysical Research Letters ! What a wonderful cruise this was; spanning >100° latitude from San Diego to Antarctica with a pit stop in Easter Island... wow. Find the full article here.

New to the Crew (clockwise from top left): Aislinn (MSc), Liam (MSc), Kayla (MSc), Lauren (BSc)

May 5th, 2021: The Walker Lab welcomes its new researchers !

2021 is going to be awesome. We are excited to welcome 2 new and 2 veteran researchers into our group for undergraduate and graduate study.

Aislinn and Kayla: Accomplished Oceanographers!

April 15th, 2021: Congatulations Honors BSc's Kayla McKee and Aislinn Fox !

Congratulations to Honors BSc students Kayla McKee and Aislinn Fox for completing their degrees and submitting excellent honors BSc theses.

Kayla's thesis work explored the molecular composition of total dissolved organic matter in Baffin Bay using a novel proton (1H) nuclear magnetic resonance (NMR) spectroscopy water suppression method. Aislinn's thesis work looked at sources and cycling of particulate organic carbon in Baffin Bay using Δ14C and δ13C.

We are thrilled that both Kayla and Aislinn will stay a little longer in our group for new MSc projects studying carbon cycling in the Canadian Arctic!

LowPhox I crew in Punta Arenas, Chile. From Left to Right: Drs. Walker, De Pol-Holz, Ulloa, Vargas.

March 11th, 2021: Walker lab helps explore cryptic carbon cycling within Anoxic Marine Zones (AMZs)

We are thrilled to be a part of a team exploring the impact of diverse bacterial and archeal metabolic pathways impacting the cycling of dissolved inorganic carbon (DIC) within the Chilean anoxic marine zone. Some of this work was recently published in Nature Communications! Find the full article here.

February 10th, 2021: A sealed-tube method for offline δ13C analysis of CO2

We have recently published a hot new method in Rapid Communications in Mass Spectrometry which transforms your Gas Bench into a ~100 port tube cracker IRMS. This method works great for samples that require offline extraction (think very small samples, or those that take days to prepare).

December 8th, 2020: Walker Lab presents Baffin Bay research at ArcticNet Meeting

Our group will be presenting two research projects highlighting the novel biogeochemical cycles of dissolved inorganic carbon (DIC) and dissolved organic matter (DOM) in Baffin Bay. What is the 14C-age of deep water in Baffin Bay? What is the molecular composition of DOM in this region? Tune in Tuesday to see presentations by students Zeidan and McKee to find out!

June 8th, 2020: A tale of two basins and the cycling of small but mighty DOM

Congratulations to Dr. Taylor Broek on his recently published article in Global Biogeochemical Cycles: "Low Molecular Weight Dissolved Organic Carbon: Aging, Compositional Changes, and Selective Utilization During Global Ocean Circulation". His work focused on directly isolating both large and small molecules for chemical and isotopic characterization, and provides evidence for these two pools of molecules having different compositions, isotopic properties, and cycling during deep ocean circulation. The article was also featured in EOS as a Research Spotlight. Keep up the good work Dr. T!

April 30th, 2020: National Academy of Science member Dr. Ellen Druffel gives us all something to celebrate !

It's not everyday you get to beat your photochemical UV reactor blank down to 0.7µM L-1. However, it is far more of an accomplishment to be nominated to the National Academy of Sciences! Congratulations Ellen!!! We are so proud of you and can't even begin to tell you how much you have impacted the lives of so many students, postdocs and early career scientists. You are an amazing advisor, mentor and friend. The Academy is lucky to have you! Thank you for giving us all something to celebrate in the COVID-era.

Please check out UC Irvine's press release here.

April 25th, 2020: Walker Lab is ready to Discover. Launch. Accelerate.

Ok, it has been one heck of an April! Our group's recent Discovery Grant proposal "Advanced Radiocarbon Dating and Molecular-Level Tools for Evaluating Marine Carbon Cycling in the Canadian Arctic" was awarded by the Natural Sciences and Engineering Research Council of Canada (NSERC). The award includes an 'Accelerator' and Early Career supplement. The success of this award will launch our Arctic carbon cycle research program over the next 5 years and officially cements our NSERC Ship time funding for a research cruise aboard the CCGS Amundsen icebreaker this Fall.

Know any students looking for Arctic research opportunities ??? Please have them contact us !

April 15th, 2020: Sara Zeidan's research is "deemed meritorious" !

Congratulations to MSc student Sara Zeidan on her successful NSERC Canada Graduate Scholarship to elucidate the mysteries of carbon cycling in deep Baffin Bay. Sara was previously awarded the Ontario Graduate Student Fellowship in 2019. The group is so proud of you Sara, you RO14CK !

April 2nd, 2020: NFRF FUNDED !! Microbes, Enzymes and DOM, OH MY!

Congratulations to lead PI Dr. Nagissa Mahmoudi (McGill) and Co-applicant Dr. Jolle Pelletier (Université de Montréal) on our successful New Frontiers in Research Fund – Exploration proposal "Resolving microbial carbon transformations in a warming world". This work will allow us to gain key insights into the roles marine microbes and extracellular enzymes play in the marine carbon cycle. Another special congratulations to Dr. Joelle Pelletier for her success in recent COVID-19 funding !

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