Avaliação Da Influência Das Condições Meteorológicas Em Dias Com Altas Concentrações De Material Particulado Na Região Metropolitana Do Rio De Janeiro

In the Metropolitan Area of Rio de Janeiro, high levels of particulate matter concentrations (PM10) with violations of the limits established by CONAMA Resolution 03/90 are routinely recorded. Analyzing data recorded between 1998 and 2008, 146 days with concentrations above these values were identified. In those days, it was possible to verify the influence of South Atlantic Subtropical Anticyclone, the lack of precipitation and temperature inversions in the lower troposphere, which confirm the strong relationship between high PM10 concentration and the atmospheric conditions in region. © 2016, ABES - Associacao Brasileira de Engenharia Sanitaria e Ambiental. All rights reserved.21230731

Phase transitions between tropical, subtropical, and extratropical cyclones: A review from IWTC-10

This review, which was adapted from a Tenth International Workshop on Tropical Cyclones (IWTC-10) report, discusses research findings and operational practices relevant to cyclone types and phase transitions (extratropical, subtropical, and tropical). The cyclone phase space (CPS) method is widely used in both historical investigations and real-time evaluation of cyclone type and transition; however, CPS parameter values depend on input data resolution, and universal thresholds do not currently exist to delineate when a cyclone transitions from one type to another. Assessments of phase transitions in a changing climate highlight potential latitude shifts in extratropical transition and increased potential for tropical transition, but realistic projections of future trends likely require high-resolution simulations that can capture the cyclone warm core. Operational meteorological centers apply varied approaches to cyclone classification via CPS parameters and other criteria, some of which depend on the tropical basin, yet these approaches cannot fully address challenges in operational classification and subsequently in communicating risks associated with these phase transitions. We recommend a multivariate historical assessment of tropical and subtropical cyclones across all basins in which they occur, including the South Atlantic Ocean and the Mediterranean Sea, to identify the potential for a more universal cyclone classification approach that meets operational needs. © 2023 The Shanghai Typhoon Institute of China Meteorological AdministrationOpen access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Ciclones em Superfície nas Latitudes Austrais: Parte I - Revisão Bibliográfica

Resumo Com o objetivo de organizar o conhecimento sinótico sobre ciclones em superfície em latitudes austrais, este trabalho (o primeiro de um conjunto de dois) apresenta uma síntese das principais características de quatro tipos de ciclones: extratropical do tipo Bjerknes e Solberg, extratropical do tipo Shapiro e Keyser, tropical e subtropical. Ao longo do texto são apresentados modelos conceituais bem como os mecanismos de ciclogênese, intensificação e ciclólise de cada tipo de ciclone. As principais diferenças entre os quatros tipos de ciclones em superfície estão nas estruturas horizontais e verticais dos campos de temperatura e vorticidade relativa