Clarice Perryman

All Publications

• A global methane observation system to track climate feedbacks for verifiable climate impact. Science (New York, N.Y.) Watts, J. D., Ordway, E., Malone, S. L., Zhu, Q., Palmer, P. I., Patel-Tupper, D., Ciais, P., Li, F., Monteverde, D. R., Arndt, K. A., Bruhwiler, L., Buma, B., Cadillo-Quiroz, H., Euskirchen, E., Hoyt, A. M., Holgerson, M., Hugelius, G., Jackson, R. B., Jacob, D., Kuhn, M., Natali, S. M., Peng, S., Perryman, C. R., Poulter, B., Rey-Sánchez, C., Sagang, L. B., Schuur, E. A., Varner, R. K., Vargas, R. 2026; 391 (6792): 1324-1327

  Abstract

  Methane measurements, particularly of natural sources, need to be expanded considerably.

  View details for DOI 10.1126/science.aef0459

  View details for PubMedID 41886586

• Insights Into the Persistence and Vulnerability of Tropical Peat Carbon Stocks From a Long-Term Field Decomposition Experiment GLOBAL BIOGEOCHEMICAL CYCLES Perryman, C. R., Baysinger, M. R., Cobb, A. R., Gandois, L., Chanton, J. P., Evans, T., Chua, A., Eri, J., Bohari Bin Haji Idi, H., Incham, J., Pu, J. P., Teo, A., Zulkiflee, R., Harvey, C. F., Hoyt, A. M. 2026; 40 (1)

  View details for DOI 10.1029/2025GB008821

  View details for Web of Science ID 001704621000001

• The PeatPic project: predicting plot-scale green leaf phenology across peatlands ENVIRONMENTAL RESEARCH LETTERS Davidson, S. J., Malhotra, A., Jassey, V. E. J., Strack, M., Aitova, E., Anderson, R., Atkinson, L. J., Barel, J. M., Bird, M., Brehier, C., Donaldson-Selby, G., Duley, E., Eklof, J., de Eyto, E., Granath, G., Grant, A., Hartmann, A., Holland, A., Huth, V., Jones, C. P., Lee, S., Lopatin, J., Milner, A. M., Peacock, M., Peichl, M., Perez-Quezada, J. F., Perryman, C. R., Pickard, A., Rautakoski, H., Silvester, E., Virkkala, A., Wegener, E. 2025; 20 (11)

  View details for DOI 10.1088/1748-9326/ae0658

  View details for Web of Science ID 001590806900001

• Fate of methane in canals draining tropical peatlands. Nature communications Perryman, C. R., Bowen, J. C., Shahan, J., Silviani P A B, D., Dayanti, E., Andriyani, Y., Asyhari, A., Gangga, A., Novita, N., Anshari, G. Z., Hoyt, A. M. 2024; 15 (1): 9766

  Abstract

  Tropical wetlands and freshwaters are major contributors to the growing atmospheric methane (CH4) burden. Extensive peatland drainage has lowered CH4 emissions from peat soils in Southeast Asia, but the canals draining these peatlands may be hotspots of CH4 emissions. Alternatively, CH4 oxidation (consumption) by methanotrophic microorganisms may attenuate emissions. Here, we used laboratory experiments and a synoptic survey of the isotopic composition of CH4 in 34 canals across West Kalimantan, Indonesia to quantify the proportion of CH4 that is consumed and therefore not emitted to the atmosphere. We find that CH4 oxidation mitigates 76.4 ± 12.0% of potential canal emissions, reducing emissions by ~70 mg CH4 m-2 d-1. Methane consumption also significantly impacts the stable isotopic fingerprint of canal CH4 emissions. As canals drain over 65% of peatlands in Southeast Asia, our results suggest that CH4 oxidation significantly influences landscape-scale CH4 emissions from these ecosystems.

  View details for DOI 10.1038/s41467-024-54063-x

  View details for PubMedID 39528506

  View details for PubMedCentralID 9540782

• Strong climate mitigation potential of rewetting oil palm plantations on tropical peatlands. The Science of the total environment Novita, N., Asyhari, A., Ritonga, R. P., Gangga, A., Anshari, G. Z., Jupesta, J., Bowen, J. C., Lestari, N. S., Kauffman, J. B., Hoyt, A. M., Perryman, C. R., Albar, I., Putra, C. A., Adiugroho, W. C., Winarno, B., Castro, M., Yeo, S., Budiarna, T., Yuono, E., Sianipar, V. C. 2024: 175829

  Abstract

  For decades, tropical peatlands in Indonesia have been deforested and converted to other land uses, mainly oil palm plantations which now cover one-fourth of the degraded peatland area. Given that the capacity for peatland ecosystems to store carbon depends largely on hydrology, there is a growing interest in rewetting degraded peatlands to shift them back to a carbon sink. Recent estimates suggest that peatland rewetting may contribute up to 13 % of Indonesia's total mitigation potential from natural climate solutions. In this study, we measured CO2 and CH4 fluxes, soil temperature, and water table level (WTL) for drained oil palm plantations, rewetted oil palm plantations, and secondary forests located in the Mempawah and Kubu Raya Regencies of West Kalimantan, Indonesia. We found that peatland rewetting significantly reduced peat CO2 emissions, though CH4 uptake was not significantly different in rewetted peatland compared to drained peatland. Rewetting drained peatlands on oil palm plantations reduced heterotrophic respiration by 34 % and total respiration by 20 %. Our results suggest that rewetting drained oil palm plantations will not achieve low CO2 emissions as observed in secondary forests due to differences in vegetation or land management. However, extrapolating our results to the areas of degraded oil palm plantations in West Kalimantan suggests that successful peatland rewetting could still reduce emissions by 3.9 MtCO2 yr-1. This result confirms that rewetting oil palm plantations in tropical peatlands is an effective natural climate solution for achieving national emission reduction targets.

  View details for DOI 10.1016/j.scitotenv.2024.175829

  View details for PubMedID 39197784

• Controls on Stable Methane Isotope Values in Northern Peatlands and Potential Shifts in Values Under Permafrost Thaw Scenarios JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES Kuhn, M. A., Varner, R. K., McCalley, C. K., Perryman, C. R., Aurela, M., Burke, S. A., Chanton, J. P., Crill, P. M., DelGreco, J., Deng, J., Heffernan, L., Herrick, C., Hodgkins, S. B., Jones, C. P., Juutinen, S., Kane, E. S., Lamit, L. J., Larmola, T., Lilleskov, E., Olefeldt, D., Palace, M. W., Rich, V. I., Schulze, C., Shorter, J. H., Sullivan, F. B., Sonnentag, O., Turetsky, M. R., Waldrop, M. P. 2024; 129 (7)

  View details for DOI 10.1029/2023JG007837

  View details for Web of Science ID 001265389700001

• Quantifying the fluxes of carbon loss from an undrained tropical peatland ecosystem in Indonesia. Scientific reports Asyhari, A., Gangga, A., Putra, C. A., Ritonga, R. P., Candra, R. A., Anshari, G. Z., Bowen, J. C., Perryman, C. R., Novita, N. 2024; 14 (1): 11459

  Abstract

  Conservation of undrained tropical peatland ecosystems is critical for climate change mitigation as they store a tremendous amount of soil carbon that is preserved under anoxic water-logged conditions. Unfortunately, there are too few measurements of carbon fluxes from these ecosystems to estimate the climate change mitigation potential from such conservation efforts. Here, we measured carbon dioxide (CO2) and methane (CH4) fluxes as well as fluvial organic carbon export over the peat swamp forest within an undrained tropical peatland landscape in East Kalimantan, Indonesia. Our measurements throughout one year (Oct 2022-Sep 2023) showed that despite its water-logged condition, peat and water overlying the swamp forest on average emits 11.02 ± 0.49 MgCO2 ha-1 yr-1 of CO2 and 0.58 ± 0.04 MgCO2e ha-1 yr-1 of CH4. Further, the fluvial organic carbon export contributes to additional carbon loss of 1.68 ± 0.06 MgCO2e ha-1 yr-1. Our results help improve the accuracy of carbon accounting from undrained tropical peatlands, where we estimated a total carbon loss of 13.28 ± 0.50 MgCO2e ha-1 yr-1. Nevertheless, the total carbon loss reported from our sites is about half than what is reported from the drained peatland landscapes in the region and resulted in a larger onsite carbon sink potential estimate compared to other undrained peat swamp forests. Together, these findings indicate that conserving the remaining undrained peatland ecosystems in Indonesia from drainage and degradation is a promising natural climate solution strategy that avoids significant carbon emissions.

  View details for DOI 10.1038/s41598-024-62233-6

  View details for PubMedID 38769331

  View details for PubMedCentralID 5495247

• Effect of Drought and Heavy Precipitation on CH4 Emissions and delta C-13-CH4 in a Northern Temperate Peatland ECOSYSTEMS Perryman, C. R. R., McCalley, C. K. K., Shorter, J. H. H., Perry, A. L. L., White, N., Dziurzynski, A., Varner, R. K. K. 2023

  View details for DOI 10.1007/s10021-023-00868-8

  View details for Web of Science ID 001044847900001

• Microtopography Matters: Belowground CH4 Cycling Regulated by Differing Microbial Processes in Peatland Hummocks and Lawns JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES Perryman, C. R., McCalley, C. K., Ernakovich, J. G., Lamit, L. J., Shorter, J. H., Lilleskov, E., Varner, R. K. 2022; 127 (8)

  View details for DOI 10.1029/2022JG006948

  View details for Web of Science ID 000842404400001

• Dominance of Diffusive Methane Emissions From Lowland Headwater Streams Promotes Oxidation and Isotopic Enrichment FRONTIERS IN ENVIRONMENTAL SCIENCE Robison, A. L., Wollheim, W. M., Perryman, C. R., Cotter, A. R., Mackay, J. E., Varner, R. K., Clarizia, P., Ernakovich, J. G. 2022; 9

  View details for DOI 10.3389/fenvs.2021.791305

  View details for Web of Science ID 000758703300001

• Heavy metals in the Arctic: Distribution and enrichment of five metals in Alaskan soils PLOS ONE Perryman, C. R., Wirsing, J., Bennett, K. A., Brennick, O., Perry, A. L., Williamson, N., Ernakovich, J. G. 2020; 15 (6): e0233297

  Abstract

  Metal contamination of food and water resources is a known public health issue in Arctic and sub-Arctic communities due to the proximity of many communities to mining and drilling sites. In addition, permafrost thaw may release heavy metals sequestered in previously frozen soils, potentially contaminating food and water resources by increasing the concentration of metals in freshwater, plants, and wildlife. Here we assess the enrichment of selected heavy metals in Alaskan soils by synthesizing publicly available data of soil metal concentrations. We analyzed data of soil concentrations of arsenic, chromium, mercury, nickel, and lead from over 1,000 samples available through the USGS Alaskan Geochemical Database to evaluate 1) the spatial distribution of sampling locations for soil metal analysis, 2) metal concentrations in soils from different land cover types and depths, and 3) the occurrence of soils in Alaska with elevated metal concentrations relative to other soils. We found substantial clustering of sample sites in the southwestern portion of Alaska in discontinuous and sporadic permafrost, while the continuous permafrost zone in Northern Alaska and the more populous Interior are severely understudied. Metal concentration varied by land cover type but lacked consistent patterns. Concentrations of chromium, mercury, and lead were higher in soils below 10 cm depth, however these deeper soils are under-sampled. Arsenic, chromium, mercury, nickel and lead concentrations exceeded average values for US soils by one standard deviation or more in 3.7% to 18.7% of the samples in this dataset. Our analysis highlights critical gaps that impede understanding of how heavy metals in thawing permafrost soils may become mobilized and increase exposure risk for Arctic communities.

  View details for DOI 10.1371/journal.pone.0233297

  View details for Web of Science ID 000539293000052

  View details for PubMedID 32492035

  View details for PubMedCentralID PMC7269202

• Thaw Transitions and Redox Conditions Drive Methane Oxidation in a Permafrost Peatland JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES Perryman, C. R., Mccalley, C. K., Malhotra, A., Fahnestock, M., Kashi, N. N., Bryce, J. G., Giesler, R., Varner, R. K. 2020; 125 (3)

  View details for DOI 10.1029/2019JG005526

  View details for Web of Science ID 000522353000019