Mineral Element Stocks in the Yedoma Domain: A Novel Method Applied to Ice-Rich Permafrost Regions


Contact
Jens.Strauss [ at ] awi.de

Abstract

With permafrost thaw, significant amounts of organic carbon (OC) previously stored in frozen deposits are unlocked and become potentially available for microbial mineralization. This is particularly the case in ice-rich regions such as the Yedoma domain. Excess ground ice degradation exposes deep sediments and their OC stocks, but also mineral elements, to biogeochemical processes. Interactions of mineral elements and OC play a crucial role for OC stabilization and the fate of OC upon thaw, and thus regulate carbon dioxide and methane emissions. In addition, some mineral elements are limiting nutrients for plant growth or microbial metabolic activity. A large ongoing effort is to quantify OC stocks and their lability in permafrost regions, but the influence of mineral elements on the fate of OC or on biogeochemical nutrient cycles has received less attention and there is an overall lack of mineral element content analyses for permafrost sediments. Here, we combine portable X-ray fluorescence (pXRF) with a bootstrapping technique to provide i) the first large-scale Yedoma domain Mineral Concentrations Assessment (YMCA) dataset, and ii) estimates of mineral element stocks in never thawed (since deposition) ice-rich Yedoma permafrost and previously thawed and partly refrozen Alas deposits. The pXRF method for mineral element quantification is non-destructive and offers a complement to the classical dissolution and measurement by optical emission spectrometry (ICP-OES) in solution. Using this method, mineral element concentrations (Si, Al, Fe, Ca, K, Ti, Mn, Zn, Sr and Zr) were assessed on 1,292 sediment samples from the Yedoma domain with lower analytical effort and lower costs relative to the ICP-OES method. The pXRF measured concentrations were calibrated using alkaline fusion and ICP-OES measurements on a subset of 144 samples (R2 from 0.725 to 0.996). The results highlight that i) the mineral element stock in sediments of the Yedoma domain (1,387,000 km2) is higher for Si, followed by Al, Fe, K, Ca, Ti, Mn, Zr, Sr, and Zn, and that ii) the stock in Al and Fe (598 ± 213 and 288 ± 104 Gt) is in the same order of magnitude as the OC stock (327–466 Gt).



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Helmholtz Cross Cutting Activity (2021-2027)
N/A
Peer revision
Peer-reviewed, Web of Science / Scopus
Publication Status
Published
Eprint ID
54552
DOI 10.3389/feart.2021.703304

Cite as
Monhonval, A. , Mauclet, E. , Pereira, B. , Vandeuren, A. , Strauss, J. , Grosse, G. , Schirrmeister, L. , Fuchs, M. , Kuhry, P. and Opfergelt, S. (2021): Mineral Element Stocks in the Yedoma Domain: A Novel Method Applied to Ice-Rich Permafrost Regions , Frontiers in Earth Science, 9 . doi: 10.3389/feart.2021.703304


Download
[thumbnail of feart-09-703304.pdf]
Preview
PDF
feart-09-703304.pdf

Download (2MB) | Preview

Share


Citation

Geographical region

Research Platforms

Campaigns
Arctic Land Expeditions > AK-Land_2016_NWAlaska
Arctic Land Expeditions > RU-Land_2015_CentralYakutia_Yukechi
Arctic Land Expeditions > RU-Land_2015_Lena
Arctic Land Expeditions > RU-Land_2017_Lena_Bykovsky
Arctic Land Expeditions > RU-Land_2008_Kolyma

Funded by
info:eu-repo/grantAgreement/EC/FP7/338335


Actions
Edit Item Edit Item