Spatio-temporal patterns of thermal anomalies and drought over tropical forests driven by recent extreme climatic anomalies

Jiménez, Juan Carlos; Barichivich, Jonathan; Mattar, Cristián; Takahashi, K.; Santamaría-Artigas, Andrés; Sobrino, José A.; Malhi, Yadvinder

doi:10.1098/rstb.2017.0300

Cited by 27 publications

(26 citation statements)

References 46 publications

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“…The marked increase in precipitation during the 20th century facilitated the agricultural expansion (especially soybean) in the arid Chaco lowlands, following the cutting of approximately 147,000 km 2 of dry forest for the year 2013 (Gasparri and Grau, 2009;Volante et al, 2016;Baumann et al, 2017). The precipitation in SESA region throughout most of the last century (e.g., Liebmann et al, 2004;Barros et al, 2008) induced a growth in agricultural production (Viglizzo and Frank, 2006) and a sustained increase in river flow (Genta et al, 1998). Finally, the temporal expression of PC2 October-March and PC3 October-March, which cumulatively explain 17.7% of total variability show not clear patterns trends in the long-term precipitation variability.…”

Section: Discussionmentioning

confidence: 99%

Interannual and Long-Term Precipitation Variability Along the Subtropical Mountains and Adjacent Chaco (22–29° S) in Argentina

Ferrero

Villalba

2019

Front. Earth Sci.

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Recent studies documenting climate variability in South America have provided valuable information for understanding current and past dynamics of the climate system. Long meteorological records represent an essential tool to properly characterize climate fluctuations from decadal to multi-decadal scales. Unfortunately, the scarcity of continuous and homogeneous instrumental records is a major constraint to determine long-term variations in South America. Our knowledge of the forcings modulating the hydrological variability in mountains is still limited, despite their importance as freshwater sources for people living in the adjacent piedmonts and lowlands. The objective of this work is to determine the spatial-temporal variability of precipitation in the humid subtropical Andes and the Chaco region in North Western Argentina (NWA). Thirtyfour rainfall records covering the common period 1934-1990, partially updated to 2016, were used to extend and identify the dominant patterns of seasonal to annual hydroclimatic variability based on principal components analysis. Intensity and frequency of droughts and pluvials (<5th and >95th percentiles, respectively) were determined for the dominant patterns of variability. Our results show a positive trend in precipitation since 1970s in all temporal patterns and sub-regions. In addition, precipitation variability (both positive and negative extremes) increases during these last decades. Correlation analysis with sea-surface temperatures and wind anomalies during summer, reveal Amazon moisture sources and large-scale oceanic controls on NWA precipitation. The extended precipitation series shows that the frequency of pluvials has increased since the 1970s interrupted by few extreme droughts. This record can be considered representative of precipitation variations across NWA, including different environments in the Chaco, sub-Andes, and Puna.

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Section: Discussionmentioning

confidence: 99%

Interannual and Long-Term Precipitation Variability Along the Subtropical Mountains and Adjacent Chaco (22–29° S) in Argentina

Ferrero

Villalba

2019

Front. Earth Sci.

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“…The northwestern/western epicenter of the drought of 2010 are attributed to AMO, whereas the southeastern one is related to a moderate to strong warming of the Pacific SST during a positive ENSO event [20]. This warming of Pacific SST induces changes in the west-east Walker circulation, reflecting dry conditions over Eastern Amazonia due to the subsidence that inhibits rainfall over the region [10,55]. According to our results, the 2010 drought was associated with reduced precipitation, humidity, and soil moisture and extreme temperatures over the west and southwest AB but also over the southeast sector.…”

Section: Discussionmentioning

confidence: 99%

Extreme Drought Events over the Amazon Basin: The Perspective from the Reconstruction of South American Hydroclimate

Garcia¹,

Libonati²,

Nunes³

2018

Water

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The Amazon basin has experienced severe drought events for centuries, mainly associated with climate variability connected to tropical North Atlantic and Pacific sea surface temperature anomalous warming. Recently, these events are becoming more frequent, more intense and widespread. Because of the Amazon droughts environmental and socioeconomic impacts, there is an increased demand for understanding the characteristics of such extreme events in the region. In that regard, regional models instead of the general circulation models provide a promising strategy to generate more detailed climate information of extreme events, seeking better representation of physical processes. Due to uneven spatial distribution and gaps found in station data in tropical South America, and the need of more refined climate assessment in those regions, satellite-enhanced regional downscaling for applied studies (SRDAS) is used in the reconstruction of South American hydroclimate, with hourly to monthly outputs from January 1998. Accordingly, this research focuses on the analyses of recent extreme drought events in the years of 2005 and 2010 in the Amazon Basin, using the SRDAS monthly means of near-surface temperature and relative humidity, precipitation and vertically integrated soil moisture fields. Results from this analysis corroborate spatial and temporal patterns found in previous studies on extreme drought events in the region, displaying the distinctive features of the 2005 and 2010 drought events. 4 of 16 moisture, and relative humidity, and with the highest temperature anomalies, considering the lag between the responses of the atmosphere and the surface conditions. Water 2017, 9, x FOR PEER REVIEW 4 of 16 drought-patterns along, taking into special attention the droughts of 2005 and 2010, with the spatial distribution of the anomalies computed from the monthly means over the Amazon basin. We only analyze the months with the lowest anomalies in precipitation, soil moisture, and relative humidity, and with the highest temperature anomalies, considering the lag between the responses of the atmosphere and the surface conditions.

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“…Barkhordarian et al (2017) attributed an increase of daily maximum and minimum temperatures, especially during the December-January-February (DJF) over the north tropical Andes (North of 8 • S), to anthropogenic activity. In addition, over the Amazon rainforest, warming trends have reached values of 0.6-0.7 • C over the last 40 years, suggesting 2016 as the warmest year in the region since at least 1950 (Jimenez-Muñoz et al, 2018;Marengo et al, 2018a).…”

Section: Air Surface Temperature Trends In the Andesmentioning

confidence: 99%

Observed and Projected Hydroclimate Changes in the Andes

et al. 2020

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The Andes is the most biodiverse region across the globe. In addition, some of the largest urban areas in South America are located within this region. Therefore, ecosystems and human population are affected by hydroclimate changes reported at global, regional and local scales. This paper summarizes progress of knowledge about long-term trends observed during the last two millennia over the entire Andes, with more detail for the period since the second half of the 20th century, and presents a synthesis of climate change projections by the end of the 21st century. In particular, this paper focuses on temperature, precipitation and surface runoff in the Andes. Changes in the Andean cryosphere are not included here since this particular topic is discussed in other paper in this Frontiers special issue, and elsewhere (e.g. IPCC, 2019b). While previous works have reviewed the hydroclimate of South America and particular sectors (i.e., Amazon and La Plata basins, the Altiplano, Northern South America, etc.) this review includes for the first time the entire Andes region, considering all latitudinal ranges: tropical (North of 27 • S), subtropical (27 • S−37 • S) and extratropical (South of 37 • S). This paper provides a comprehensive view of past and recent changes, as well as available climate change projections, over the entire Andean range. From this review, the main knowledge gaps are highlighted and urgent research necessities in order to provide more mechanistic understanding of hydroclimate changes in the Andes and more confident projections of its possible changes in association with global climate change. Keywords: hydroclimate of the Andes, global change in the Andes, hydroclimate trends in the Andes, hydroclimate projections of the Andes, climate change in the Andes, climate change scenarios for the Andes

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Spatio-temporal patterns of thermal anomalies and drought over tropical forests driven by recent extreme climatic anomalies

Abstract: 2018 Spatio-temporal patterns of thermal anomalies and drought over tropical forests driven by recent extreme climatic anomalies. Phil. Trans. R. Soc. B 373: 20170300. http://dx.

Cited by 27 publications

References 46 publications

Interannual and Long-Term Precipitation Variability Along the Subtropical Mountains and Adjacent Chaco (22–29° S) in Argentina

Interannual and Long-Term Precipitation Variability Along the Subtropical Mountains and Adjacent Chaco (22–29° S) in Argentina

Extreme Drought Events over the Amazon Basin: The Perspective from the Reconstruction of South American Hydroclimate

Observed and Projected Hydroclimate Changes in the Andes

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