TY - JOUR
T1 - The Dissolution of Olivine Added to Soil at 4°C
T2 - Implications for Enhanced Weathering in Cold Regions
AU - Pogge von Strandmann, Philip A. E.
AU - Tooley, Chloe
AU - Mulders, Josephina J. P. A.
AU - Renforth, Phil
N1 - Funding Information:
Birkbeck, University of London is thanked for the MSc of CT. Gary Tarbuck is thanked for assistance during concentration analyses. We thank two reviewers for their useful comments.
Publisher Copyright:
Copyright © 2022 Pogge von Strandmann, Tooley, Mulders and Renforth.
PY - 2022/2/10
Y1 - 2022/2/10
N2 - Crushed olivine was added to a soil core to mimic enhanced weathering, and water was continually dripped through for ~6 months. Our experiments were conducted at 4°C, and are compared to previously run identical experiments at 19°C. Olivine dissolution rates in both experiments start out similar, likely due to fines and sharp crystal corners. However, after >100 days of reaction, the dissolution rate at 4°C was two orders of magnitude lower than at 19°C. The accumulation of heavy metals, such as Ni and Cd, was low in both experiments, but soil retention of these elements was proportionally higher at higher temperatures, likely due to enhanced sorption and formation of clays. Overall, this study suggests that olivine dissolution rates in experiments that mimic natural settings are orders of magnitude slower than in normal laboratory experiments, and that enhanced weathering may be a considerably less efficient method of carbon dioxide removal at low climatic temperatures. Both of these conclusions have implications for the application of enhanced weathering as a CO2 removal method.
AB - Crushed olivine was added to a soil core to mimic enhanced weathering, and water was continually dripped through for ~6 months. Our experiments were conducted at 4°C, and are compared to previously run identical experiments at 19°C. Olivine dissolution rates in both experiments start out similar, likely due to fines and sharp crystal corners. However, after >100 days of reaction, the dissolution rate at 4°C was two orders of magnitude lower than at 19°C. The accumulation of heavy metals, such as Ni and Cd, was low in both experiments, but soil retention of these elements was proportionally higher at higher temperatures, likely due to enhanced sorption and formation of clays. Overall, this study suggests that olivine dissolution rates in experiments that mimic natural settings are orders of magnitude slower than in normal laboratory experiments, and that enhanced weathering may be a considerably less efficient method of carbon dioxide removal at low climatic temperatures. Both of these conclusions have implications for the application of enhanced weathering as a CO2 removal method.
KW - carbon sequestration
KW - enhanced weathering of minerals
KW - temperature effect on weathering
KW - weathering
KW - weathering experiment
UR - http://www.scopus.com/inward/record.url?scp=85125271557&partnerID=8YFLogxK
U2 - 10.3389/fclim.2022.827698
DO - 10.3389/fclim.2022.827698
M3 - Article
AN - SCOPUS:85125271557
SN - 2624-9553
VL - 4
JO - Frontiers in Climate
JF - Frontiers in Climate
M1 - 827698
ER -