A5037665769- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Climate change and permafrost
- Toxic Organic Pollutants Impact
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Marine and coastal ecosystems
- Arctic and Antarctic ice dynamics
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Isotope Analysis in Ecology
- Microbial bioremediation and biosurfactants
- Hydrocarbon exploration and reservoir analysis
- Groundwater and Isotope Geochemistry
- Groundwater flow and contamination studies
- Ocean Acidification Effects and Responses
- Mercury impact and mitigation studies
- Heavy metals in environment
- Radioactive contamination and transfer
- Arctic and Russian Policy Studies
- Oceanographic and Atmospheric Processes
- Geochemistry and Elemental Analysis
- Microbial Community Ecology and Physiology
Stockholm University
2016-2025
Bolin Centre for Climate Research
2016-2025
Baylor University
2010
Swedish Museum of Natural History
1998-2009
Umeå University
2006-2009
Maldives National University
2009
Indian Institute of Tropical Meteorology
2009
American Geophysical Union
2009
Washington Center
2009
V.I. Il'ichev Pacific Oceanological Institute
2009
Evidence is accumulating that sorption of organic chemicals to soils and sediments can be described by "dual-mode sorption": absorption in amorphous matter (AOM) adsorption carbonaceous materials such as black carbon (BC), coal, kerogen, collectively termed "carbonaceous geosorbents" (CG). Median BC contents a fraction total are 9% for (number sediments, n ≈ 300) 4% (n = 90). Adsorption compounds CG nonlinear generally exceeds AOM factor 10−100. Sorption particularly extensive attain more...
Existing field data indicate that soot may significantly affect the environmental speciation of polycyclic aromatic hydrocarbons (PAHs). To expand hydrophobic partition models to include partitioning, we need quantify fsc, fraction solid matrix, and Ksc, soot-carbon-normalized coefficient. this end, have developed a method allows quantification carbon in dilute complex sedimentary matrices. Non-soot organic is removed by thermal oxidation, inorganic carbonates are acidification, fol lowed...
Black carbon (BC), the product of incomplete combustion fossil fuels and biomass (called elemental (EC) in atmospheric sciences), was quantified 12 different materials by 17 laboratories from disciplines, using seven methods. The were divided into three classes: (1) potentially interfering materials, (2) laboratory‐produced BC‐rich (3) BC‐containing environmental matrices (from soil, water, sediment, atmosphere). This is first comprehensive intercomparison this type (multimethod, multilab,...
Carbonaceous aerosols cause strong atmospheric heating and large surface cooling that is as important to South Asian climate forcing greenhouse gases, yet the aerosol sources are poorly understood. Emission inventory models suggest biofuel burning accounts for 50 90% of emissions, whereas elemental composition ambient points fossil fuel combustion. We used radiocarbon measurements winter monsoon from western India Indian Ocean determine biomass combustion produced two-thirds bulk...
Bubble, Warming and Trouble Vast quantities of methane are stored in ocean sediments, mostly the form clathrates, but is also trapped submerged terrestrial permafrost that was flooded during last deglaciation. There thus concern climate warming could warm waters enough to release cryogenically beneath seabed, causing even more warming. Shakova et al. (p. 1246 ; see Perspective by Heimann ) report than 80% bottom water, 50% surface over East Siberian Arctic Shelf, indeed supersaturated with...
This review provides an assessment of sediment trap accuracy issues by gathering data to address hydrodynamics, the problem zooplankton "swimmers," and solubilization material after collection.For each topic, is identified, its magnitude causes reviewed using selected examples, update on methods correct for potential bias or minimize new technologies presented.To hydrodynamic biases due flow over mouth, use neutrally buoyant traps encouraged.The influence swimmers best minimized that limit...
Abstract Combustion-derived black carbon (BC) aerosols accelerate glacier melting in the Himalayas and Tibet (the Third Pole (TP)), thereby limiting sustainable freshwater supplies for billions of people. However, sources BC reaching TP remain uncertain, hindering both process understanding efficient mitigation. Here we present source-diagnostic Δ 14 C/δ 13 C compositions isolated from aerosol snowpit samples TP. For Himalayas, found equal contributions fossil fuel (46±11%) biomass (54±11%)...
Formation of highly condensed black carbon (BC) from vegetation fires and wood fuel combustion presumably transfers otherwise rapidly cycling the atmosphere‐biosphere cycle into a much slower geological form. Recently reported BC fractions total organic (TOC) in surficial marine sediments span wide range (2‐90%), leaving it presently unclear whether this variation reflects natural processes or is largely due to method differences. In order elucidate importance burial specificity applied...
ABSTRACT The Tibetan Plateau and its surroundings are known as the Third Pole (TP). This region is noted for high rates of glacier melt associated hydrological shifts that affect water supplies in Asia. Atmospheric pollutants contribute to climatic cryospheric changes through their effects on solar radiation albedos snow ice surfaces; moreover, behavior fates within cryosphere environmental impacts topics increasing concern. In this review, we introduce a coordinated monitoring research...
Thick haze plagued northeastern China in January 2013, strongly affecting both regional climate and human respiratory health. Here, we present dual carbon isotope constrained (Δ14C δ13C) source apportionment for combustion-derived black aerosol (BC) three key hotspot regions (megacities): North Plain (NCP, Beijing), the Yangtze River Delta (YRD, Shanghai), Pearl (PRD, Guangzhou) 2013. BC, here quantified as elemental (EC), is one of most health-detrimental components PM2.5 a strong warming...
Abstract. High loadings of anthropogenic carbonaceous aerosols in Chinese air influence the quality for over one billion people and impact regional climate. A large fraction (17–80%) this aerosol carbon is water-soluble, promoting cloud formation thus climate cooling. Recent findings, however, suggest that water-soluble also absorb sunlight, bringing additional direct indirect warming effects, yet extent nature light absorption by "brown carbon" its relation to sources poorly understood....
Water-soluble organic carbon (WSOC) is a major constituent (~ 20–80%) of the total aerosol over Indian subcontinent during dry winter season. Due to its multiple primary and secondary formation pathways, sources WSOC are poorly characterized. In this study, we present radiocarbon constraints on biomass versus fossil in PM2.5 for 2010/2011 period megacity Delhi, situated northern part heavily polluted Indo-Gangetic Plain. The fuel contribution Delhi (21 ± 4%) similar that recently found at...
Mobilization of Arctic permafrost carbon is expected to increase with warming-induced thawing. However, this effect challenging assess due the diverse processes controlling release various organic (OC) pools from heterogeneous landscapes. Here, by radiocarbon dating terrestrial OC components in fluvially and coastally integrated estuarine sediments, we present a unique framework for deconvoluting contrasting mobilization mechanisms surface vs. deep (permafrost) across climosequence Eurasian...
Light-absorbing organic aerosols, known as brown carbon (BrC), counteract the overall cooling effect of aerosols on Earth's climate. The spatial and temporal dynamics their light-absorbing properties are poorly constrained unaccounted for in climate models, because limited ambient observations. We combine isotope forensics (δ13C) with measurements light absorption a conceptual aging model to constrain loss absorptivity (i.e., bleaching) water-soluble BrC (WS-BrC) one world's largest emission...
Climate warming is expected to mobilize northern permafrost and peat organic carbon (PP-C), yet magnitudes system specifics of even current releases are poorly constrained. While part the PP-C will degrade at point thaw CO2 CH4 directly amplify global warming, another enter fluvial network, potentially providing a window observe large-scale remobilization patterns. Here, we employ decade-long, high-temporal resolution record 14C in dissolved particulate (DOC POC, respectively) deconvolute...
Sustained release of methane (CH(4)) to the atmosphere from thawing Arctic permafrost may be a positive and significant feedback climate warming. Atmospheric venting CH(4) East Siberian Shelf (ESAS) was recently reported on par with flux tundra; however, future scale these releases remains unclear. Here, based results our latest observations, we show that emissions this shelf are likely determined by state subsea degradation. We observed two previously understudied areas ESAS: outer shelf,...
Abstract Organic aerosol (OA) constitutes a substantial fraction of fine particles and affects both human health climate. It is becoming clear that OA absorbs light substantially (hence termed Brown Carbon, BrC), adding uncertainties to global radiative forcing estimations. The few current radiative-transfer chemical-transport models include BrC primarily consider sources from biogenic biomass combustion. However, radiocarbon fingerprinting here clearly indicates light-absorbing organic...
The dual carbon isotope signatures and optical properties of carbonaceous aerosols have been investigated simultaneously for the first time in South Asian outflow during an intensive campaign at Maldives Climate Observatory on Hanimaadhoo (MCOH) (February March 2012). As one component Cloud Aerosol Radiative Forcing Dynamics Experiment, this paper reports sources atmospheric processing elemental (EC) water-soluble organic (WSOC) as examined by a approach. radiocarbon (Δ14C) data show that...