DSpace Angular :: Browsing by Author "Lambert, Fabrice"

Browsing by Author "Lambert, Fabrice"

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A model-data assessment of the role of Southern Ocean processes in the last glacial termination
(2016) Eichinger, Roland; Shaffer, Gary; Albarrán, Nelsón; Maisa Rojas; Lambert, Fabrice
A review of the bipolar see-saw from synchronized and high resolution ice core water stable isotope records from Greenland and East Antarctica
(2015) Landais, A.; Masson Delmotte, V.; Stenni, B.; Selmo, E.; Roche, D. M.; Jouzel, J.; Lambert, Fabrice; Guillevic, M.; Bazin, L.; Arzel, O.; Vinther, B.; Gkinis, V.; Popp, T.
An improved land biosphere module for use in reduced complexity Earth System Models with application to the last glacial
(2017) Eichinger, Roland; Shaffer, Gary; Albarran, Nelson; Rojas, Maisa; Lambert, Fabrice
An improved land biosphere module for use in reduced complexity Earth System Models with application to the last glacial termination
(2017) Eichinger, Roland; Shaffer, Gary; Nelson Albarrán; Rojas, Maisa; Lambert, Fabrice
This supplement provides additional material to the article “An improved land biosphere module for use in reduced complexity ESMs with application to the last glacial termination”. We provide a detailed description of our treatment of the new vegetation dependent albedo, the dust radiative forcing and high latitude ocean iron-limitation and present an example case for the snow 5 and ice line parameterisation that interacts with the new biosphere scheme. Next, we give the mathematical description of the ocean vertical diffusion profile function in the high latitude model ocean that is applied for generating Last Glacial Maximum (LGM) conditions in the DCESS model and the formulation of the resumption of deep ocean mixing. Furthermore, we present some additional information on the generation of model LGM conditions in atmosphere and ocean, a literature review on the Mystery Interval (MI) and an overview for model and proxy data changes during the MI. The Supplement ends with additional information on the various 14 10 C production rate time series that were applied in the model simulations, an analysis of the DCESS model calculated 14C production rate time series and the isotope ratio definitions.
An improved land biosphere module for use in the DCESS Earth system model (version 1.1) with application to the last glacial termination
(2017) Eichinger, Roland; Shaffer, Gary; Albarran, Nelson; Rojas, Maisa; Lambert, Fabrice
Anthropogenic drying in central-southern Chile evidenced by long-term observations and climate model simulations
(2018) Boisier, Juan P.; Álvarez Garretón, Camila; Cordero, Raúl R.; Damiani, Alessandro; Gallardo, Laura; Garreaud, René D.; Lambert, Fabrice
Anthropogenic Perturbations to the Atmospheric Molybdenum Cycle
(2021) Wong, Michelle Y.; Rathod, Sagar D.; Marino, Roxanne; Li, Longlei; Lambert, Fabrice; Howarth, Robert W.; Alastuey, Andres; Alaimo,Maria Grazia; Barraza, Francisco; Castro Carneiro, Manuel
Assessing the Effect of Glacier Runoff Changes on Basin Runoff and Agricultural Production in the Indus, Amu Darya, and Tarim Interior Basins
(2025) Calvo Gallardo, Rubén Ignacio; Lambert, Fabrice; Álamos Correa, Nicolás; Urquiza, Anahí
Climate change is leading to a substantial reduction in glacier mass, and it is anticipated that during this century, the peak water contribution of glaciers to runoff will occur in major glacierized basins around the world. Glacier runoff is a crucial source of water in mountain basins, and a decrease in its contribution can affect agricultural production. In this study, we modeled the agricultural sector's response to changes in glacier runoff in the Asian basins of Amu Darya, Tarim Interior, and Indus, using the Global Change Analysis Model, which was driven by surface runoff derived from the Xanthos hydrological model and the Open Global Glacier Model. Our findings indicate that under SSP5-8.5, there is an increase in accessible water during the Peak-Water Glacier Runoff compared to the Historical Glacier Runoff scenario. However, accessible water under SSP58.5 falls below the Historical Glacier Runoff scenario in the last decades of the 21st century. The initial increase in accessible water drives the GCAM agricultural model to increase the production of oil crops, root tubers, sugar crops, and fruits, but only temporarily until peak glacier runoff occurrence. In Pakistan, we observe the adaptive response of neighboring basins (increased production) to a reduction in crop production in the Amu Darya and Indus and vice versa. Our results support the argument that policymakers should implement a holistic long-term perspective, in which the apparent positive economic effect of the temporary increase in accessible water is balanced with the threat to intergenerational access to freshwater and ecosystem conservation.
Black carbon and other light-absorbing impurities in snow in the Chilean Andes
(2019) Rowe, Penny M.; Cordero, Raúl R.; Warren, Stephen G.; Stewart, Emily; Doherty, Sarah J.; Pankow, Alec; Schrempf, Michael; Casassa, Gino; Carrasco, Jorge; Lambert, Fabrice; Pizarro, Jaime; MacDonell, Shelley; Damiani, Alessandro; Rondanelli, Roberto; Huneeus, Nicolás; Fernandoy, Francisco; Neshyba, Steven
Characterizing the Atmospheric Mn Cycle and Its Impact on Terrestrial Biogeochemistry
(2024) Lu, Louis; Li, Longlei; Rathod, Sagar; Hess, Peter; Martinez, Carmen; Fernandez, Nicole; Goodale, Christine; Thies, Janice; Wong, Michelle Y.; Alaimo, Maria Grazia; Artaxo, Paulo; Barraza, Francisco; Barreto, Africa; Beddows, David; Chellam, Shankarararman; Chen, Ying; Chuang, Patrick; Cohen, David D.; Dongarra, Gaetano; Gaston, Cassandra; Gomez, Dario; Morera-Gomez, Yasser; Hakola, Hannele; Hand, Jenny; Harrison, Roy; Hopke, Philip; Hueglin, Christoph; Kuang, Yuan-Wen; Kylloenen, Katriina; Lambert, Fabrice; Maenhaut, Willy; Martin, Randall; Paytan, Adina; Prospero, Joseph; Gonzalez, Yenny; Rodriguez, Sergio; Smichowski, Patricia; Varrica, Daniela; Walsh, Brenna; Weagle, Crystal; Xiao, Yi-Hua; Mahowald, Natalie
The role of manganese (Mn) in ecosystem carbon (C) biogeochemical cycling is gaining increasing attention. While soil Mn is mainly derived from bedrock, atmospheric deposition could be a major source of Mn to surface soils, with implications for soil C cycling. However, quantification of the atmospheric Mn cycle, which comprises emissions from natural (desert dust, sea salts, volcanoes, primary biogenic particles, and wildfires) and anthropogenic sources (e.g., industrialization and land-use change due to agriculture), transport, and deposition, remains uncertain. Here, we use compiled emission data sets for each identified source to model and quantify the atmospheric Mn cycle by combining an atmospheric model and in situ atmospheric concentration measurements. We estimated global emissions of atmospheric Mn in aerosols (<10 mu m in aerodynamic diameter) to be 1,400 Gg Mn year(-1). Approximately 31% of the emissions come from anthropogenic sources. Deposition of the anthropogenic Mn shortened Mn "pseudo" turnover times in 1-m-thick surface soils (ranging from 1,000 to over 10,000,000 years) by 1-2 orders of magnitude in industrialized regions. Such anthropogenic Mn inputs boosted the Mn-to-N ratio of the atmospheric deposition in non-desert dominated regions (between 5 x 10(-5) and 0.02) across industrialized areas, but that was still lower than soil Mn-to-N ratio by 1-3 orders of magnitude. Correlation analysis revealed a negative relationship between Mn deposition and topsoil C density across temperate and (sub)tropical forests, consisting with atmospheric Mn deposition enhancing carbon respiration as seen in in situ biogeochemical studies.
Constraining Present-Day Anthropogenic Total Iron Emissions Using Model and Observations
(2024) Rathod, Sagar D.; Hamilton, Douglas S.; Nino, Lance; Kreidenweis, Sonia M.; Bian, Qijing; Mahowald, Natalie M.; Alastuey, Andres; Querol, Xavier; Paytan, Adina; Artaxo, Paulo; Herut, Barak; Gaston, Cassandra; Prospero, Joseph; Chellam, Shankararaman; Hueglin, Christoph; Varrica, Daniela; Dongarra, Gaetano; Cohen, David D.; Smichowski, Patricia; Gomez, Dario; Lambert, Fabrice; Barraza, Francisco; Bergametti, Gilles; Rodriguez, Sergio; Gonzalez-Ramos, Yenny; Hand, Jenny; Kyllonen, Katriina; Hakola, Hannele; Chuang, Patrick; Hopke, Philip K.; Harrison, Roy M.; Martin, Randall V.; Walsh, Brenna; Weagle, Crystal; Maenhaut, Willy; Morera-Gomez, Yasser; Chen, Yu-Cheng; Pierce, Jeffrey R.; Bond, Tami C.
Iron emissions from human activities, such as oil combustion and smelting, affect the Earth's climate and marine ecosystems. These emissions are difficult to quantify accurately due to a lack of observations, particularly in remote ocean regions. In this study, we used long-term, near-source observations in areas with a dominance of anthropogenic iron emissions in various parts of the world to better estimate the total amount of anthropogenic iron emissions. We also used a statistical source apportionment method to identify the anthropogenic components and their sub-sources from bulk aerosol observations in the United States. We find that the estimates of anthropogenic iron emissions are within a factor of 3 in most regions compared to previous inventory estimates. Under- or overestimation varied by region and depended on the number of sites, interannual variability, and the statistical filter choice. Smelting-related iron emissions are overestimated by a factor of 1.5 in East Asia compared to previous estimates. More long-term iron observations and the consideration of the influence of dust and wildfires could help reduce the uncertainty in anthropogenic iron emissions estimates.
Contaminant emissions as indicators of chemical elements in the snow along a latitudinal gradient in southern Andes
(NATURE RESEARCH, 2021) Pizarro, Jaime; Vergara, Pablo M.; Cerda, Sergio; Cordero, Raul R.; Castillo, Ximena; Rowe, Penny M.; Casassa, Gino; Carrasco, Jorge; Damiani, Alessandro; Llanillo, Pedro J.; Lambert, Fabrice; Rondanelli, Roberto; Huneeus, Nicolas; Fernandoy, Francisco; Alfonso, Juan; Neshyba, Steven
The chemical composition of snow provides insights on atmospheric transport of anthropogenic contaminants at different spatial scales. In this study, we assess how human activities influence the concentration of elements in the Andean mountain snow along a latitudinal transect throughout Chile. The concentration of seven elements (Al, Cu, Fe, Li, Mg, Mn and Zn) was associated to gaseous and particulate contaminants emitted at different spatial scales. Our results indicate carbon monoxide (CO) averaged at 20 km and nitrogen oxide (NOx) at 40 km as the main indicators of the chemical elements analyzed. CO was found to be a significant predictor of most element concentrations while concentrations of Cu, Mn, Mg and Zn were positively associated to emissions of NOx. Emission of 2.5 mu m and 10 mu m particulate matter averaged at different spatial scales was positively associated to concentration of Li. Finally, the concentration of Zn was positively associated to volatile organic compounds (VOC) averaged at 40 km around sampling sites. The association between air contaminants and chemical composition of snow suggests that regions with intensive anthropogenic pollution face reduced quality of freshwater originated from glacier and snow melting.
Coupled European and Greenland last glacial dust activity driven by North Atlantic climate
(2017) Ujvari, G.; Stevens, T.; Molnar, M.; Demeny, A.; Lambert, Fabrice; Varga, G.; Jull, A.; Pall-Gergely, B.; Buylaert, J.; Kovacs, J.
Dust archives within polar ice cores
(Elsevier, 2024) Lambert, Fabrice
Mineral dust aerosols are pivotal components of Earth's atmosphere and significantly influence the climate system. Investigating their impacts through ice core records offers unique insights into paleoclimate dynamics. Various techniques, including direct and indirect measurements of concentrations and size distributions, unravel the complex story of dust provenance, transport, and deposition. Dust records correlate with temperature reconstructions, reflecting the interconnectedness of climatic processes. Enhanced characterization methods promise a deeper understanding of the role of dust in the Earth's history. The current state of knowledge on paleoclimatic mineral dust in ice cores is reviewed, including its measurement, hemispheric differences, and climatic interpretation.
Dust fluxes and iron fertilization in Holocene and Last Glacial Maximum climates
(2015) Lambert, Fabrice; Tagliabue, Alessandro; Shaffer, Gary; Lamy, Frank; Winckler, Gisela; Farias, Laura; Gallardo, Laura; De Pol-Holz, Ricardo
Elemental and mineralogical composition of the western andean snow (18°S–41°S)
(2019) Alfonso, Juan A.; Cordero, Raul R.; Rowe, Penny M.; Neshyba, Steven; Casassa, Gino; Carrasco, Jorge; MacDonell, Shelley; Lambert, Fabrice; Pizarro, Jaime; Fernandoy, Francisco; Feron, Sarah; Damiani, Alessandro; Llanillo, Pedro; Sepulveda, Edgardo; Jorquera, Jose; Garcia, Belkis; Carrera, Juan M.; Oyola, Pedro; Kang, Choong-Min
Emergence of robust precipitation changes across crop production areas in the 21st century
(2019) Rojas, Maisa; Lambert, Fabrice; Ramírez Villegas, Juián; Challinor, Andrew J,
Estimating coastal flood hazard of Tossa de Mar, Spain: a combined model - data interviews approach
(SPRINGER, 2021) Hernandez Mora, Marina; Meseguer Ruiz, Oliver; Karas, Cyrus; Lambert, Fabrice
Human settlements in coastal areas are highly vulnerable to extreme events, especially in the Mediterranean area, which houses a large number of tourists during the summer and autumn months. It is important to carry out hazard studies at local scale to improve our understanding of natural and anthropogenic processes involved in episodes of coastal flooding. We reconstruct and characterize an extreme weather event in Tossa de Mar (northeastern Spain) and the subsequent urban flooding that occurred in 2008. Our results show flood heights up to 1.27 m, with the maximum occurring between 24 and 64 h after the start of the event. This is broadly consistent with the reconstructions obtained through interviews and photographs. Based on model simulations, we produce a hazard map for the town based on hydrodynamic scenarios for different return periods. We show that the southern part of the town is more susceptible to flooding, whereas the northern part is relatively resilient to extreme events. We recommend the adaption of a currently existing dune by adding vegetation and slightly increasing its height. This low economic cost action would significantly reduce flooding and increase resilience in this area.
Evolution of air quality in Santiago : the role of mobility and lessons from the science-policy interface
(2018) Gallardo, Laura; Barraza, Francisco; Ceballos, Andrés; Galleguillos, Mauricio; Huneeus, Nicolás; Lambert, Fabrice; Ibarra, Cecilia; Munizaga, Marcela A.; O'Ryan, Raúl E.; Osses, Mauricio; Tolvett, Sebastián; Urquiza, Anahí; Véliz, Karina D.
History Matching of the Last Glacial Cycle Model for the Icelandic and Patagonian Ice Sheets
(European Geosciences Union (EGU), 2025) Goffin, Alexis; Tarasov, Lev; Benediktsson, Ívar Örn; Licciardi, Joseph; Rivera, Andrés; Lambert, Fabrice

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