Conducive circulation patterns and transport mechanisms for spring dust from Taklimakan Desert to the Tibetan Plateau

Environment International, Год журнала: 2025, Номер 197, С. 109356 - 109356

Опубликована: Март 1, 2025

Dust aerosols have an impact on both public health and environmental health. The Taklimakan Desert (TD) serves as a significant source of high-altitude airborne dust over the Tibetan Plateau (TP). However, systematic understanding its transport mechanism requires further exploration beyond isolated case studies. This study effectively identified atmospheric circulation patterns mechanisms that facilitate movement from TD to TP in spring, utilizing obliquely rotated principal component analysis alongside various reanalysis satellite datasets. findings indicate out five patterns, three - specifically northwest high-pressure (NWH), northern with warm anomaly (NH-W), cold (NH-C) favor occurrence storms TD. In NWH NH-W is transported northeastern northwestern central result interaction between dynamic, thermal, terrain factors. process features elevated boundary layer, increased temperature, steeper temperature lapse rate, more surface sensible heat flux contrast, NH-C pattern restricts due presence downdrafts along north slope TP, reduced layer stable stratification research provides valuable insights into crucial function transporting which beneficial for assessing condition cryosphere developing protection strategies.

Язык: Английский

Evaluation of near-surface atmospheric composition reanalysis data in the metropolis of São Paulo, Brazil

Journal of Southern Hemisphere Earth System Science, Год журнала: 2025, Номер 75(2)

Опубликована: Май 20, 2025

Air quality monitoring stations are unequally distributed worldwide despite the relevance of air pollution impacts. After validation, atmospheric composition reanalysis can fill information gaps in locations where observations absent. Reanalysis datasets based on global emission inventories, often overlooking regional characteristics. This underscores need for and local evaluation studies, which remain scarce South America. study presents first products Metropolitan Area São Paulo (MASP), Brazil. Two were evaluated: MERRA-2 (Modern-Era Retrospective Analysis Research Applications) CAMS (Copernicus Atmospheric Monitoring Service). Four pollutants assessed, considering monthly concentration time series between 2015 2019: ozone (O3), nitrogen dioxide (NO2), inhalable (PM10) fine particulate matter (PM2.5). Near-surface was compared with MASP. correctly reproduced seasonal interannual variability concentrations, significant Pearson correlation coefficients range 0.75–0.89. However, overestimated O3, PM2.5 PM10 by 136, 50 16% respectively. By contrast, failed to reproduce main features pollutant MASP, especially PM10. Based these findings, we conclude that adequately represents near-surface conditions although bias corrections required. means data may be used obtain about cities is absent, at least Brazilian near Further studies necessary investigate adequacy other regions.

Язык: Английский

Global aerosol models considering their spatial heterogeneities based on AERONET measurements

Atmospheric Research, Год журнала: 2024, Номер 308, С. 107521 - 107521

Опубликована: Июнь 13, 2024

Язык: Английский