Estimating the impact of a 2017 smoke plume on surface climate over northern Canada with a climate model, satellite retrievals, and weather forecasts

Authorea (Authorea), Год журнала: 2023, Номер unknown

Опубликована: Июнь 8, 2023

In August 2017, a smoke plume from wildfires in British Columbia and the Northwest Territories recirculated persisted over northern Canada for two weeks. We compared full-factorial set of NASA Goddard Institute Space Studies ModelE simulations to satellite retrievals aerosol optical depth carbon monoxide, finding that performance was dependent on model configuration, more so choice injection height approach, scheme biomass burning emissions estimates than horizontal winds nudging. particular, with free-tropospheric injection, mass-based high fire NOx led unrealistically depth. Using paired excluded, we estimated 16 days an 850 000 km2 region, decreased planetary boundary layer heights by between 253 m 547 m, downward shortwave radiation 52 Wm-2 172 Wm-2, surface temperature 1.5 oC 4.9 oC, latter spanning independent estimate operational weather forecasts 3.7 cooling. The strongest climate effects were configurations detailed microphysics stronger first indirect effect.

Язык: Английский

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Distinct urban-rural gradients of air NO2 and SO2 concentrations in response to emission reductions during 2015–2022 in Beijing, China

Environmental Pollution, Год журнала: 2023, Номер 333, С. 122021 - 122021

Опубликована: Июнь 18, 2023

Язык: Английский

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Identifying the Distribution and Frequency of Dust Storms in Iran Based on Long-Term Observations from over 400 Weather Stations

Sustainability, Год журнала: 2023, Номер 15(16), С. 12294 - 12294

Опубликована: Авг. 11, 2023

Middle Eastern countries suffer from dust events due to extended arid areas. Among them, Iran is a country experiencing high record of each year causing major environmental challenges. Although there are previous studies the present situations storm occurrences in Iran, most have analyzed meteorological dataset limited weather stations and areas Iran. To understand nationwide trends distributions frequencies events, comprehensive statistical evaluations based on different categories, required. Therefore, this study analyzes 12-year databases obtained at 427 clarify distribution occurrence recent decade by classifying into suspended dust, rising storm. The highest days belongs which surpassed 150 per year, followed with over 100 and, finally, storms frequency 30 as annual statistics events. In contrast, were some that recorded minimal during observation periods. prove spatial nonuniformity showed distinct concentration western regions country, while tended occur more frequently southern, eastern, central parts Accordingly, seasonal analyses indicate number occurred spring season, being greater than other seasons all three categories. Nonetheless, do not demonstrate any significant trends, only 2012 having across terms monthly analyses, increase late early summer These importance studying numerous station datasets long-term variations.

Язык: Английский

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Photochemical evolution of the molecular composition of dissolved organic carbon and dissolved brown carbon from wood smoldering

Environment International, Год журнала: 2024, Номер 186, С. 108629 - 108629

Опубликована: Апрель 1, 2024

Recently, extreme wildfires occur frequently around the world and emit substantial brown carbon (BrC) into atmosphere, whereas molecular compositions photochemical evolution of BrC remain poorly understood. In this work, primary smoke aerosols were generated from wood smoldering, secondary formed by OH radical photooxidation in an oxidation flow reactor, where both samples collected on filters. After solvent extraction filter samples, composition dissolved organic (DOC) was determined Fourier transform ion cyclotron resonance mass spectrometry (FTICR MS). The obtained based constraints DOC formulae. proportion fractions accounted for approximately 1/3–1/2 formulae DOC. characteristics showed higher levels state, double bond equivalents, modified aromaticity index than those DOC, indicating that a class structures with relatively unsaturated aromatic degree fractions. comparative analysis suggested aliphatic olefinic dominated (contributing to 70.1%-76.9%), while olefinic, aromatic, condensed 97.5%-99.9%). It is worth noting only contained carboxylic-rich alicyclic molecules (CRAMs)-like structures, hydrocarbons, highly oxygenated compounds. CRAMs-like most abundant species Nevertheless, specific varied subgroups after aging. results highlight similarities differences This work will provide insights understanding smoke.

Язык: Английский

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Mortality Burden from Wildfire Smoke Under Climate Change

SSRN Electronic Journal, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

Purchase - $5 NBER Subscribers Download Add Paper to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Язык: Английский

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