@InProceedings{ZeriMoBeOlSiZe:2023:DrMoBr,
               author = "Zeri, Marcelo and Moura, Magna S. B. and Bezerra, Bergson Gueders 
                         and Oliveira, Pablo Eli Soares and Silva, Cl{\'a}udio Mois{\'e}s 
                         Santos and Zeri, Gisleine da Silva Cunha",
          affiliation = "{Centro Nacional de Monitoramento e Alertas de Desastres Naturais 
                         (Cemaden)} and Embrapa and {Universidade Federal do Rio Grande do 
                         Norte (UFRN)} and {Universidade Federal do Rio Grande do Norte 
                         (UFRN)} and {Universidade Federal do Rio Grande do Norte (UFRN)} 
                         and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Drought monitoring for Brazil's semi-arid region using flux towers 
                         measurements and remote sensing products",
            booktitle = "Proceedings...",
                 year = "2023",
         organization = "AGU FAll Meeting",
            publisher = "AGU",
             abstract = "Drought monitoring can be carried out using in-situ 
                         instrumentation, such as flux towers, and remote sensing products. 
                         Flux towers include measurements of air temperature, solar 
                         radiation, soil moisture, rainfall, and evapotranspiration, among 
                         other variables. Remote sensing products include datasets of 
                         rainfall, soil moisture, evapotranspiration and vegetation 
                         indices. The resolutions in space and time of remote sensing 
                         products have become increasingly compatible with measurements 
                         made with flux towers. Remote sensing products for rainfall, soil 
                         moisture and vegetation indices are available in spatial 
                         resolutions of few kilometers, which is close to an eddy flux 
                         tower footprint. Regarding the temporal resolution, some remote 
                         sensing products can be obtained at daily and weekly scales, which 
                         is compatible with the sub-daily measurements from eddy covariance 
                         towers. The semi-arid climate region of northeastern Brazil is the 
                         one with the greatest vulnerability to drought events due to 
                         family farming practices and dependence on rainfed agriculture. 
                         The monitoring of droughts in the region is essential to 
                         objectively determine its impact and evolution over time, in 
                         addition to support the formulation of public policies and 
                         stakeholders actions on mitigation and adaptation efforts. In this 
                         work we present preliminary results from drought monitoring over 
                         two contrasting ecosystems over the Brazilian semiarid. One is a 
                         degraded agricultural site soon to be converted to grass and the 
                         other is over a Caatinga preserved site, the typical biome in the 
                         region characterized by short and thorny tree species adapted to 
                         dry environments. The towers were established in mid 2023 with 
                         measurements of carbon dioxide and evapotranspiration fluxes, in 
                         addition to meteorological and soil measurements. Initial results 
                         show contrasting daily cycles of fluxes, with higher 
                         evapotranspiration and net uptake of CO2 over the Caatinga site. 
                         Future analyses include the comparison of long-term time series of 
                         fluxes with remote sensing products, especially vegetation indices 
                         and soil moisture estimates. Flux towers measurements have a great 
                         potential to be used to validate and test the sensibility of 
                         remote sensing products to drought intensity and propagation.",
  conference-location = "San Francisco, CA",
      conference-year = "11-15 Dec. 2023",
             language = "en",
        urlaccessdate = "13 maio 2024"
}