Publications

2022

Potocki M, Dixon DA, Kurbatov A V., ..., Clifford H and Mayewski PA (2022) Trace metal emission history captured in a Chilean ice core. Atmos. Environ. 276(February), 119002.
link to article.

Potocki M, Mayewski PA, Matthews T, Perry LB,... Clifford HM, and Birkel SD (2022) Mt. Everest’s highest glacier is a sentinel for accelerating ice loss. npj Clim. Atmos. Sci.
link to article.

2021

Clifford, H. M., Potocki, M., Koch, I., Sherpa, T., Handley, M., Korotkikh, E., ... & Mayewski, P. A. (2021). A case study using 2019 pre-monsoon snow and stream chemistry in the Khumbu region, Nepal. Science of The Total Environment, 148006.
link to article.

Miner, K. R., Mayewski, P. A., Hubbard, M., Broad, K., Clifford, H.M., Napper, I., ... & Priscu, J. (2021). A Perspective of the Cumulative Risks from Climate Change on Mt. Everest: Findings from the 2019 Expedition. International Journal of Environmental Research and Public Health, 18(4), 1928.
link to article.
Miner, K. R., Clifford, H., Taruscio, T., Potocki, M., Solomon, G., Ritari, M., ... & Mayewski, P. A. (2021). Deposition of PFAS ‘forever chemicals’ on Mt. Everest. Science of the Total Environment, 759, 144421.
link to article.
In The News
"In their study, published in ScienceDirect, the researchers concluded that the PFAS particles were being shed by climbers and introduced into the local watershed. In essence, mountaineers were destroying the mountain—poisoning themselves, future hikers, and residents for hundreds of years to come. The culprit was their gear." -GQ

2020

Napper, I. E., Davies, B. F. R., Clifford, H.M., Elmore, A. C., Gajurel, A. P., & Thompson, R. C. (2020). Reaching New Heights in Plastic Pollution — Preliminary Findings of Microplastics on Mount Everest. One Earth, 3(5), 621–630. https://doi.org/10.1016/j.oneear.2020.10.020
link to article.
In The News
"The microplastics on Everest are largely made up of polyester, followed by acrylic, nylon, and polypropylene—materials all commonly used in outdoor gear. The plastics were also in greater concentration wherever humans most commonly camp." -National Geographic
More, A. F., Loveluck, C. P., Clifford, H.M., Handley, M. J., Korotkikh, E. V., Kurbatov, A. V., ... & Mayewski, P. A. (2020). The impact of a six‐year climate anomaly on the ‘Spanish Flu’Pandemic and WWI. GeoHealth, e2020GH000277.
link to article.
In The News
"The researchers found that spikes in deaths during the war usually followed cold temperatures and heavy rain. They said that the chilly temperatures could have contributed to co-infection with pneumonia, which made the death toll even higher." -Washington Post
Loveluck, C., More, A., Spaulding, N., Clifford, H.M., Handley, M., Hartman, L., . . . McCormick, M. (2020). Alpine ice and the annual political economy of the Angevin Empire, from the death of Thomas Becket to Magna Carta, c. AD 1170–1216. Antiquity, 1-18. doi:10.15184/aqy.2019.202
link to article.
Miner, K. R., Mayewski, P. A., Baidya, S. K., Broad, K., Clifford, H., Elmore, A., ... & Tuladhar, S. (2020). An overview of physical risks in the Mt. Everest region. One Earth, 3(5), 547-550.
link to article.

2019

Clifford, H.M., Spaulding, N., Kurbatov, A., More, A., Korotkikh, E., Sneed, S., ... & McCormick, M. (2019). A 2000 Year Saharan Dust Event Proxy Record from an Ice Core in the European Alps. Journal of Geophysical Research: Atmospheres.
link to article.
In The News
"Alpine ice cores covering the past two millennia suggests that Saharan dust has increased in the past 100 years. Also notable in the ice core record are the Saharan dust events between 1315 and 1365, a time that includes the Great Famine, when about 10% of Europe’s population perished, and the Black Death. This has led to speculation that poor air quality from Saharan dust may have contributed to a decline in human health and made the population more vulnerable." -The Guardian
Yan, Y., Bender, M., Brook, E., Clifford, H.M., Kemeny, P., Kurbatov, A., ... & Higgins, J. (2019). Two-million-year-old snapshots of atmospheric gases from Antarctic ice. Nature, 574(7780), 663-666.
link to article.
In The News
"In a paper published in the journal Nature, a group of scientists used air trapped in the bubbles in ice as old as 2 million years to reconstruct levels of carbon-dioxide and methane in Earth's atmosphere. This is the first time scientists were able to study an ice core that old." -Forbes
More, A., Spaulding, N., Clifford, H.M., Handley, M., Kurbatov, A., Korotkikh, E., ... & Mayewski, P. (2019). Present, Past and Future of Lead Pollution through the World’s Highest-Resolution Atmospheric Record from the European Alps and Historical Testimonies. Environmental Epidemiology, 3, 274-275.
link to article.

2018

Loveluck, C. P., McCormick, M., Spaulding, N. E., Clifford, H.M., Handley, M. J., Hartman, L., ... & Sneed, S. B. (2018). Alpine ice-core evidence for the transformation of the European monetary system, AD 640–670. Antiquity, 92(366), 1571-1585
link to article.
In The News
"The study, published in Antiquity, analyzes glacial ice from the Swiss Alps for evidence of atmospheric change and its effect on the financial landscape of early Europe, confirming scientists’ understanding of the unfortunate circumstances of 536 and subsequent economic and social shifts." -TIME
Pales, A. R., Li, B., Clifford, H.M., Kupis, S., Edayilam, N., Montgomery, D., Liang, W.-Z., Dogan, M., Tharayil, N., Martinez, N., Moysey, S., Powell, B., & Darnault, C. J. (2018). Preferential flow systems amended with biogeochemical components: imaging of a two-dimensional study., Hydrol. Earth Syst. Sci., 22, 2487-2509.
link to article.
Li, B., Pales, A. R., Clifford, H.M., Kupis, S., Hennessy, S., Liang, W. Z., ... & Darnault, C. J. (2018). Preferential flow in the vadose zone and interface dynamics: Impact of microbial exudates. Journal of Hydrology, 558, 72-89.
link to article.

2017

Pales, A. R., Kinsey, E. N., Li, C., Mu, L., Bai, L., Clifford, H.M., & Darnault, C. J. (2017). Rheological properties of silica nanoparticles in brine and brine-surfactant systems. Journal of Nanofluids, 6(5), 795-803
link to article.

Works in Progress

Clifford, H. M., et. al. Sub-seasonal association of modern Central Andean high mountain atmospheric transport and deposition. For submission to Journal of Glaciology, Summer 2021.
Clifford, H. M., et. al. Ice core-based evidence of European heavy metal pollution over the past 2000 years. For submission to Scientific Reports, Fall 2021.

Conference Presentations

Clifford, H., Potocki, M., Koch, I., Sherpa, T. C., Handley, M., Korotkikh, E., ... & Mayewski, P. A. (2020, December). Natural and human contributions to pre-monsoon snow and stream chemistry in the Khumbu/Mt. Everest region, Nepal. In AGU Fall Meeting 2020. AGU.
Clifford, H., Korotkikh, E., Potocki, M., Rodda, C., Spaulding, N. E., Kurbatov, A., ... & Mayewski, P. A. (2019, December). Applications for Ultra-High Resolution Glaciochemical Records From High Altitude Mountain Glaciers. In AGU Fall Meeting Abstracts (Vol. 2019, pp. C11C-1301).
Clifford, H., Bohleber, P., Spaulding, N. E., Kurbatov, A., Korotkikh, E., Sneed, S. B., ... & Mayewski, P. A. (2018, December). A 2100 Year Ultra-High-Resolution Saharan Dust Record. In AGU Fall Meeting Abstracts (Vol. 2018, pp. C52A-08).
Clifford, H., Spaulding, N., Royer, M., Sneed, S., Korotkikh, E., Handley, M., ... & Mayewski, P. (2018, April). A New Approach for Ultra-High-Resolution Ice Core Data Processing. In EGU General Assembly Conference Abstracts (p. 11521).
Clifford, H., Mayewski, P. A., Higgins, J. A., Introne, D., Kurbatov, A., Sneed, S. B., ... & Yan, Y. (2016, December). An Ultra-High Resolution Investigation of 1 Ma Old Ice from Allan Hills Blue Ice Area, Antarctica. In AGU Fall Meeting Abstracts (Vol. 2016, pp. PP31B-2273).

Thesis

Master's Thesis: Clifford, H. (2019). A 2000 Year Saharan Dust Event Record From a European Alps Ice Core.
link to thesis.