Please login first
José Marengo   Dr.  Other 
Timeline See timeline
José Marengo published an article in October 2018.
Top co-authors See all
Ricardo M. Trigo

133 shared publications

Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisboa, Portugal

Raquel Nieto

96 shared publications

Environmental Physics Laboratory (EphysLab), Facultad de Ciencias, Universidade de Vigo, 32004 Ourense, Spain

Isabel F. Trigo

57 shared publications

Instituto Português do Mar e da Atmosfera Lisbon Portugal

Luis Gimeno

53 shared publications

Environmental Physics Laboratory (EphysLab), Facultad de Ciencias, Universidade de Vigo, 32004 Ourense, Spain

Alexandre M. Ramos

47 shared publications

Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal

Publication Record
Distribution of Articles published per year 
(2014 - 2018)
Total number of journals
published in
Publications See all
RAPID-COMMUNICATION 0 Reads 0 Citations Tools for Communicating Agricultural Drought over the Brazilian Semiarid Using the Soil Moisture Index Marcelo Zeri, Regina S. Alvalá, Rogério Carneiro, Gisleine C... Published: 11 October 2018
Water, doi: 10.3390/w10101421
DOI See at publisher website ABS Show/hide abstract
Soil moisture over the Brazilian semiarid region is presented in different visualizations that highlight spatial, temporal and short-term agricultural risk. The analysis used the Soil Moisture Index (SMI), which is based on a normalization of soil moisture by field capacity and wilting point. The index was used to characterize the actual soil moisture conditions into categories from severe drought to very wet. In addition, the temporal evolution of SMI was implemented to visualize recent trends in short-term drought and response to rainfall events at daily time steps, as new data are available. Finally, a visualization of drought risk was developed by considering a critical value of SMI (assumed as 0.4), below which water stress is expected to be triggered in plants. A novel index based on continuous exposure to critical SMI was developed to help bring awareness of real time risk of water stress over the region: the Index of Stress in Agriculture (ISA). The index was tested during a drought over the region and successfully identified locations under water stress for periods of three days or more. The monitoring tools presented here help to describe the real time conditions of drought over the region using daily observations. The information from those tools support decisions on agricultural management such as planting dates, triggering of irrigation, or harvesting.
BOOK-CHAPTER 0 Reads 0 Citations Increase Risk of Drought in the Semiarid Lands of Northeast Brazil Due to Regional Warming above 4 °C Jose A. Marengo, Ana Paula Cunha, Wagner R. Soares, Roger R.... Published: 26 September 2018
Climate Change Risks in Brazil, doi: 10.1007/978-3-319-92881-4_7
DOI See at publisher website
BOOK-CHAPTER 0 Reads 0 Citations Final Remarks and Recommendations Jose A. Marengo, Carlos A. Nobre, Wagner R. Soares, Ana P. S... Published: 26 September 2018
Climate Change Risks in Brazil, doi: 10.1007/978-3-319-92881-4_9
DOI See at publisher website
CONFERENCE-ARTICLE 16 Reads 0 Citations <strong>Drought and </strong><strong>wet episodes in Amazonia: the role of atmospheric moisture transport</strong> Rogert Sorí, José Marengo, Raquel Nieto, Anita Drumond, Luis... Published: 06 November 2017
First International Electronic Conference on the Hydrological Cycle, doi: 10.3390/CHyCle-2017-04846
DOI See at publisher website ABS Show/hide abstract

The Amazon River basin (ARB) in Sud-America contains the world largest rainforest and biodiversity and plays an important role in the regional and global hydrological cycle. It consist of several sub-basins as the Negro River basin (NRB) in the north and the Madeira River basin (MRB) to the south, both considered of utmost importance in the Amazonia for the Amazon River. The precipitation annual cycle in both basins experiences an opposite annual cycle and as a consequence their contributions to the Amazon River are lagged in time. Here we utilized the Standardized Precipitation Index (SPEI) to identify drought and wet conditions in the NRB and MRB along the period 1980-2016. This index has the advantages over other index because considers the effect of the Atmospheric Evaporation Demand (AED) on drought severity. Besides, the Lagrangian dispersion model FLEXPART v9.0 was used to track backward in time air masses residing over the basins and to calculate along the trajectories the budget of (E-P). This permitted to identify those regions from where air masses gain humidity (E-P>0) before arriving at the basins, what we consider as moisture sources. FLEXPART has been successfully utilized for the same goal in several studies. This allowed investigating the hydrological budget of (E-P) over the NRB and MRB as well as their role as sources of moisture for surrounded continental regions. This study examines the variability of moisture uptake by the basins from these sources during drought and wet episodes in the basins. We consider this a new approach to be a useful method for understanding the causes and variability of drought and wet events in other regions worldwide.

Article 0 Reads 5 Citations Climatic characteristics of the 2010-2016 drought in the semiarid Northeast Brazil region José A. Marengo, Lincoln M. Alves, Regina C.S Alvala, Ana Pa... Published: 14 August 2017
Anais da Academia Brasileira de Ciências, doi: 10.1590/0001-3765201720170206
DOI See at publisher website ABS Show/hide abstract
This study discusses the climatological aspects of the most severe drought ever recorded in the semiarid region Northeast Brazil. Droughts are recurrent in the region and while El Nino has driven some of these events others are more dependent on the tropical North Atlantic sea surface temperature fields. The drought affecting this region during the last 5 years shows an intensity and impact not seen in several decades in the regional economy and society. The analysis of this event using drought indicators as well as meteorological fields shows that since the middle 1990s to 2016, 16 out of 25 years experienced rainfall below normal. This suggests that the recent drought may have in fact started in the middle-late 1990s, with the intense droughts of 1993 and 1998, and then the sequence of dry years (interrupted by relatively wet years in 2007, 2008, 2009 and 2011) after that may have affected the levels of reservoirs in the region, leading to a real water crisis that was magnified by the negative rainfall anomalies since 2010. Key words: drought; Northeast Brazil; rainfall; water deficit; El Nino; vulnerability
Article 0 Reads 2 Citations Meteorological context of the onset and end of the rainy season in Central Amazonia during the GoAmazon2014/5 Jose A. Marengo, Gilberto F. Fisch, Lincoln M. Alves, Natana... Published: 26 June 2017
Atmospheric Chemistry and Physics Discussions, doi: 10.5194/acp-17-7671-2017
DOI See at publisher website ABS Show/hide abstract
The onset and demise of the rainy season in Amazonia are assessed in this study using meteorological data from the GoAmazon experiment, with a focus on the 2014–2015 rainy season. In addition, global reanalyses are also used to identify changes in circulation leading to the establishment of the rainy season in the region. Our results show that the onset occurred in January 2015, 2–3 pentads later than normal, and the rainy season during the austral summer of 2015 contained several periods with consecutive dry days in both Manacapuru and Manaus, which are not common for the wet season, and resulted in below-normal precipitation. The onset of the rainy season has been strongly associated with changes in large-scale weather conditions in the region due to the effect of the Madden–Julian Oscillation (MJO). Regional thermodynamic indices and the height of the boundary layer did not present a significant difference between the onset and demise of the wet season of 2015. This suggests that local changes, such as those in the regional thermodynamic characteristics, may not have influenced its onset. Thus, variability of the large-scale circulation was responsible for regional convection and rainfall changes in Amazonia during the austral summer of 2014–2015.