A5016001350- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Marine and coastal ecosystems
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Oceanographic and Atmospheric Processes
- Heavy metals in environment
- Ocean Acidification Effects and Responses
- Air Quality Monitoring and Forecasting
- Indoor Air Quality and Microbial Exposure
- Plant responses to elevated CO2
- Radioactivity and Radon Measurements
- Oil Spill Detection and Mitigation
- Hydrocarbon exploration and reservoir analysis
- Isotope Analysis in Ecology
- Coastal and Marine Management
- Marine and fisheries research
- Auction Theory and Applications
- Toxic Organic Pollutants Impact
- Geochemistry and Geologic Mapping
- Aeolian processes and effects
- Groundwater and Isotope Geochemistry
- Soil and Water Nutrient Dynamics
- Aquatic Ecosystems and Phytoplankton Dynamics
Chubu University
2019-2024
National Institute of Oceanography
2021-2024
Reliance Industries (India)
2024
Hokkaido University
2014-2020
Physical Research Laboratory
2010-2020
Bolin Centre for Climate Research
2016-2020
Stockholm University
2016-2020
Kasugai Municipal Hospital
2020
Ahmedabad University
2019
Atmospheric deposition is a source of potentially bioavailable iron (Fe) and thus can partially control biological productivity in large parts the ocean. However, explanation observed high aerosol Fe solubility compared to that soil particles still controversial, as several hypotheses have been proposed explain this observation. Here, statistical analysis estimated from four models observations compiled multiple field campaigns suggests pyrogenic aerosols are main sources with at low...
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...
The first field measurements of light absorbing water-soluble organic carbon (WSOC), referred as brown (BrC), have been made in the marine atmospheric boundary layer (MABL) during continental outflow to Bay Bengal (BoB) and Arabian Sea (ARS). absorption signal measured at 365 nm aqueous extracts aerosols shows a systematic linear increase with WSOC concentration, suggesting significant contribution from BrC properties aerosols. mass coefficient (babs) an inverse hyperbolic relation...
Abstract. This work reports on the current status of global modeling iron (Fe) deposition fluxes and atmospheric concentrations analyses differences between models, as well models observations. A total four 3-D chemistry transport (CTMs) general circulation (GCMs) participated in this intercomparison, framework United Nations Joint Group Experts Scientific Aspects Marine Environmental Protection (GESAMP) Working 38, “The Atmospheric Input Chemicals to Ocean”. The Fe (TFe) emission strength...
Abstract Atmospheric dicarboxylic acids (DCA) are a ubiquitous water‐soluble component of secondary organic aerosols (SOA), which can act as cloud condensation nuclei (CCN), affecting the Earth's climate. Despite high abundances oxalic acid and related compounds in marine aerosols, there is no consensus on what controls their distributions over open ocean. Marine biological productivity could play role production DCA, but substantial evidence to support this hypothesis. Here we present...
Incomplete understanding of the sources secondary organic aerosol (SOA) leads to large uncertainty in both air quality management and climate change assessment. Chemical reactions occurring atmospheric aqueous phase represent an important source SOA mass, yet, effects anthropogenic emissions on (aqSOA) are not well constrained. Here we use compound-specific dual-carbon isotopic fingerprints (δ13C Δ14C) dominant aqSOA molecules, such as oxalic acid, track precursor formation mechanisms aqSOA....
A lack of consensus on the distributions and formation pathways secondary organic aerosols (SOA) over oceanic regions downwind pollution sources limits our ability to assess their climate impact globally. As a case study, we report here water-soluble SOA components such as dicarboxylic acids, oxocarboxylic α-dicarbonyls in continental outflows from Indo-Gangetic Plain (IGP) Southeast Asia (SEA) Bay Bengal. Oxalic acid (C2) is dominant species followed by succinic (C4) glyoxylic acids (ωC2)...
Abstract The Indo‐Gangetic Plain (IGP) in northern India, Pakistan, and Bangladesh is a major source of carbonaceous aerosols South Asia. However, poorly constrained seasonality their sources over the IGP leads to large uncertainty climate health effects. Here we present first data set for year‐round radiocarbon (Δ 14 C) stable carbon (δ 13 C)‐based apportionment total (TC) ambient PM 10 ( n = 17) collected from an urban site (Kanpur: 26.5°N, 80.3°E) during January 2007 2008. C‐based...
Black carbon (BC) aerosols perturb climate and impoverish air quality/human health—affecting ∼1.5 billion people in South Asia. However, the lack of source-diagnostic observations BC is hindering evaluation uncertain bottom-up emission inventories (EIs) thereby also models/policies. Here, we present dual-isotope-based (Δ14C/δ13C) fingerprinting wintertime at two receptor sites continental outflow. Our results show a remarkable similarity contributions biomass fossil combustion, both from...
In this paper, we synthesize the size distribution and optical properties of atmospheric water-soluble fraction light-absorbing organic carbon (brown carbon; BrC) in continental outflow from Indo-Gangetic Plain (IGP) South Asia to North Indian Ocean.
This study reports on stable carbon (δ13CTC) and nitrogen (δ15NTN) isotopic composition of total (TC TN) in the fine mode aerosols (PM2.5; N = 31) collected over Bay Bengal (BoB). The samples represent two distinct wind regimes during cruise (27 December 2008–28 January 2009); one from Indo-Gangetic Plain (referred as IGP-outflow) another Southeast Asia (SEA-outflow). PM2.5 IGP-outflow show higher δ13CTC (−25.0 to −22.8 ‰; −23.8±0.6 ‰) than those SEA-outflow (−27.4 −24.7 −25.3±0.9 ‰)....
Abstract The present study aims to assess the molecular distributions of water‐soluble dicarboxylic acids (diacids: C 2 –C 12 ), oxocarboxylic (C 9 and α ‐dicarbonyls (glyoxal methylglyoxal) in aerosols collected over western North Pacific (WNP) during a summer cruise (August September 2008). measured organics show pronounced latitudinal with higher concentrations region 30°N–45°N (average 63 ng m −3 ) than 10°N–30°N (18 ). Mass fraction oxalic acid total aliphatic diacids (ΣC showed values...