Climate Changes of the Recent Past in the South American Continent: Inferences Based on Analysis of Borehole Temperature Profiles

Hamza, Valiya M.; Vieira, None Fábio

doi:10.5772/23363

Cited by 5 publications

(6 citation statements)

References 39 publications

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“…In such a region with very low population density and without agriculture, changes in land use are insignificant and could not have generated a fake warming signal. Also, the amplitude of the inferred climate warming is in the range suggested by Huang et al (2000) for the South American continent (1.4 K) and comparable with the warming of ≈ 1.4-2.2 K starting in the late 19th century inferred for semiarid regions of South America (Hamza and Vieira, 2011). The timing of the warming in the latter study coincides with that of the Totoral site but it is much earlier than the very recent warming (past 40 years) at Inca de Oro, Vallenar, and for the entire north-central Chile region.…”

Section: Comparison With Other Borehole Temperature Studies In South supporting

confidence: 76%

“…We have selected some of these data to include in our analysis. Measurements were also made in Brazil (Vitorello et al, 1980) but some of the data are in publications of limited accessibility (Hamza et al, 1987). Despite the uneven sampling, Huang et al (2000) inferred a cumulative temperature increase of 1.4 K over the past 500 years in South America from their global reconstruction of GST variations in the continents.…”

Section: Introductionmentioning

confidence: 99%

“…Because this study relied on only 16 borehole temperature-depth profiles for South America, additional data are needed to confirm its conclusions. Hamza and Vieira (2011) selected and analyzed, in terms of GST variations, more than 30 temperaturedepth profiles deeper than 200 m from eastern Brazil, the Amazon region, the Cordilleran region of Colombia, and the Cordilleran region of Peru. They inferred a warming of 2-3.5 • C from the early 20th century to present and observed similar trends in tropical and subtropical zones.…”

Section: Introductionmentioning

confidence: 99%

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Recent climate variations in Chile: constraints from borehole temperature profiles

et al. 2018

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Abstract. We have compiled, collected, and analyzed 31 temperature–depth profiles from boreholes in the Atacama Desert in central and northern Chile. After screening these profiles, we found that only nine profiles at four different sites were suitable to invert for ground temperature history. For all the sites, no surface temperature variations could be resolved for the period 1500–1800. In the northern coastal region of Chile, there is no perceptible temperature variation at all from 1500 to present. In the northern central Chile region, between 26 and 28∘ S, the data suggest a cooling from ≈ 1850 to ≈ 1980 followed by a 1.9 K warming starting ≈ 20–40 years BP. This result is consistent with the ground surface temperature histories for Peru and the semiarid regions of South America. The duration of the cooling trend is poorly resolved and it may coincide with a marked short cooling interval in the 1960s that is found in meteorological records. The total warming is greater than that inferred from proxy climate reconstructions for central Chile and southern South America, and by the PMIP3-CMIP5 surface temperature simulations for the north-central Chile grid points. The differences among different climate reconstructions, meteorological records, and models are likely due to differences in spatial and temporal resolution among the various data sets and the models.

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Section: Comparison With Other Borehole Temperature Studies In South supporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent climate variations in Chile: constraints from borehole temperature profiles

et al. 2018

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“…In order to obtain the best adjustment to the measured data displayed in Figure 1, the Cermak (1971) temperature boundary condition was considered. As another confirmation of this behavior, Hamza and Vieira (2011) presented the same concave subsurface temperature behavior for the Southern Hemisphere site of Juazeiro, Brazil, with no convex subsurface temperature variation with depth (which would indicate a cooling effect).…”

Section: Methodssupporting

confidence: 62%

Subsurface temperature change attributed to climate change at the northern latitude site of Kapuskasing, Canada

Novara,

Berdichevsky,

Piacentini

2023

Atm.

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Subsurface temperatures have been measured in different regions of the world, usually near the surface up to a depth of about a hundred meters. In this work a forward model calculation for a Northern Hemisphere soil temperature site at Kapuskasing, Canada, is presented, employing the solution of the differential equation of heat conduction through a semi-infinite homogeneous solid, subject to surface boundary conditions determined by surface air temperature. In this way, a detailed analysis is made of the subsurface temperature as a function of ground depth and for the time interval ranging from 1970 to the future (including the next century), for different scenarios of climate change. From these results, it was possible to determine the following characteristic quantities: (a) the depth where the surface perturbation (practically) finishes (in the range of about 180-200 m); (b) the depth where the subsurface temperature changes its slope from negative to positive; (c) the temperature change at the surface for the years where data exist; (d) the thermal gradient at steady state in the starting year (1880); (e) the temperature differences extrapolated at surface and at a 20 m depth, this last value corresponding to the depth at which seasonal and diurnal temperature variations are negligible; (f) the heat flow at surface to the inner part of the soil attributed to climate change, and (g) the temperature changes at surface for the 100 years interval (1980-2080) and mainly for the next century (2080-2180), for each site and for each IPCC Representative Concentration Pathway (RCP) scenario. As an example, the impact of the change in mean annual soil temperature due to global warming in near-surface geothermal energy is described.

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“…Because this study relies only on 16 borehole temperature-depth profiles in South America, additional data are needed to confirm its conclusions. Hamza and Vieira (2011) In an attempt to enlarge the South American borehole temperature data set, we have collected 31 borehole temperature-depth profiles measured in 1994, 2012, and 2015 in northern Chile, a region that was void of data, and reconstructed the GST history 10 for the past 500 years. We compare these reconstructions with meteorological data for the region, past climate inferences based on proxy data, and model simulations for central Chile and southern South America to determine climate trends for northern Chile and assess their robustness.…”

mentioning

confidence: 99%

Recent climate variations in Chile: constraints from borehole temperature profiles

Pickler¹,

Fausto²,

Beltrami³

et al. 2017

Preprint

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Abstract. We have compiled, collected, and analyzed 31 temperature depth profiles from boreholes in the Atacama desert in central and northern Chile. After screening these profiles, we found that only 9 profiles at 4 different sites were suitable to invert for ground temperature history. For all the sites, no surface temperature variations could be resolved for the period 1500-1800. In the northern coastal region of Chile, there is no perceptible temperature variation at all from 1500 to present. In the northern central Chile region, between 26• S and 28• S, the data suggest a cooling from ∼1850 to ∼1980 followed by a 5 1.9 K warming starting ∼20-40 years BP. This result is consistent with the ground surface temperature histories for Peru and the semiarid regions of South America. The duration of the cooling trend is poorly resolved and it may coincide with a marked short cooling interval in the 1960s that is found in meteorological records. The total warming is greater than that inferred from proxy climate reconstructions for central Chile and southern South America, and by the PMIP3/CMIP5 surface temperature simulations for the north-central Chile grid points. The differences between different climate reconstructions, meteorological 10 records, and models are likely due to differences in spatial and temporal resolution between the various data sets and the models.

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Climate Changes of the Recent Past in the South American Continent: Inferences Based on Analysis of Borehole Temperature Profiles

Cited by 5 publications

References 39 publications

Recent climate variations in Chile: constraints from borehole temperature profiles

Recent climate variations in Chile: constraints from borehole temperature profiles

Subsurface temperature change attributed to climate change at the northern latitude site of Kapuskasing, Canada

Recent climate variations in Chile: constraints from borehole temperature profiles

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