scholarly journals Temperature increase and its effects on fish stress physiology in the context of global warming

2020 ◽  
Author(s):  
Sébastien Alfonso ◽  
Manuel Gesto ◽  
Bastien Sadoul
Keyword(s):  
Global Warming ◽  
Temperature Increase ◽  
Stress Physiology

scholarly journals Increase in Air Temperature in The Region of South Sumatra Province as the Indicator of Global Warming and the Effect on Transpiration of Lansium domesticum Corr.

2019 ◽  
Author(s):  
Ari Sugiarto ◽  
Hanifa Marisa ◽  
Sarno
Keyword(s):  
Global Warming ◽  
Air Temperature ◽  
Transpiration Rate ◽  
Temperature Increase ◽  
Secondary Data ◽  
Temperature Data ◽  
Randomized Design ◽  
Maximum Air Temperature ◽  
Lansium Domesticum ◽  
Minimum Air Temperature

Abstract Global warming is one of biggest problems faced in the 21st century. One of the impacts of global warming is that it can affect the transpiration rate of plants that °Ccur. This study purpose to see how much increase in air temperature that occurred in the region of South Sumatra Province and to know the effect of increase in ari temperature in the region of South Sumatra Province on transpiration rate of Lansium domesticum Corr. This study used a complete randomized design with 9 treatments (22.9 °C, 23.6 °C, 24.6 °C, 26.3 °C, 27 °C, 27.8 °C, 31.7 °C, 32.5 °C, and 32.9 °C) and 3 replications. Air temperature data as secondary data obtained from the Meteorology, Climatology and Geophysics Agency (MCGA) Palembang Climatology Station in South Sumatra Province. The measurement of transpiration rate is done by modified potometer method with additional glass box. The data obtained are presented in the form of tables and graphs. Transpiration rate (mm3/g plant/hour) at temperture 22.9 °C = 4.37, 23.6 °C = 7.03, 24.6 °C = 8.03, 26.3 °C = 10.11, 27 °C = 13.13, 27.8 °C = 17.87, 31.7 °C = 23.21, 32.5 °C= 25.45 and 32.9 °C= 27.24. At the minimum air temperature in the region of South Sumatra Province there is increase in air temperature of 1.5 °C, average daily air temperature increase 1.3 °C and maximum air temperature increase 1.2 °C.

scholarly journals Pacific variability reconciles observed and modelled global mean temperature increase since 1950

2020 ◽  
Author(s):  
Martin B. Stolpe ◽  
Kevin Cowtan ◽  
Iselin Medhaug ◽  
Reto Knutti
Keyword(s):  
Global Warming ◽  
Temperature Change ◽  
Temperature Increase ◽  
Global Temperature ◽  
Global Mean Temperature ◽  
Mean Temperature ◽  
The Pacific ◽  
Global Warming Hiatus ◽  
Warming Hiatus ◽  
Global Mean

Abstract Global mean temperature change simulated by climate models deviates from the observed temperature increase during decadal-scale periods in the past. In particular, warming during the ‘global warming hiatus’ in the early twenty-first century appears overestimated in CMIP5 and CMIP6 multi-model means. We examine the role of equatorial Pacific variability in these divergences since 1950 by comparing 18 studies that quantify the Pacific contribution to the ‘hiatus’ and earlier periods and by investigating the reasons for differing results. During the ‘global warming hiatus’ from 1992 to 2012, the estimated contributions differ by a factor of five, with multiple linear regression approaches generally indicating a smaller contribution of Pacific variability to global temperature than climate model experiments where the simulated tropical Pacific sea surface temperature (SST) or wind stress anomalies are nudged towards observations. These so-called pacemaker experiments suggest that the ‘hiatus’ is fully explained and possibly over-explained by Pacific variability. Most of the spread across the studies can be attributed to two factors: neglecting the forced signal in tropical Pacific SST, which is often the case in multiple regression studies but not in pacemaker experiments, underestimates the Pacific contribution to global temperature change by a factor of two during the ‘hiatus’; the sensitivity with which the global temperature responds to Pacific variability varies by a factor of two between models on a decadal time scale, questioning the robustness of single model pacemaker experiments. Once we have accounted for these factors, the CMIP5 mean warming adjusted for Pacific variability reproduces the observed annual global mean temperature closely, with a correlation coefficient of 0.985 from 1950 to 2018. The CMIP6 ensemble performs less favourably but improves if the models with the highest transient climate response are omitted from the ensemble mean.

scholarly journals Estimating the near-surface permafrost-carbon feedback on global warming

2012 ◽  
Vol 9 (2) ◽  
pp. 649-665 ◽  
Author(s):  
T. Schneider von Deimling ◽  
M. Meinshausen ◽  
A. Levermann ◽  
V. Huber ◽  
K. Frieler ◽  
...  
Keyword(s):  
Global Warming ◽  
Carbon Cycle ◽  
Soil Carbon ◽  
Temperature Increase ◽  
Climate Model ◽  
Soil Layer ◽  
Permafrost Degradation ◽  
Near Surface ◽  
Uncertainty Range ◽  
Permafrost Thaw

Abstract. Thawing of permafrost and the associated release of carbon constitutes a positive feedback in the climate system, elevating the effect of anthropogenic GHG emissions on global-mean temperatures. Multiple factors have hindered the quantification of this feedback, which was not included in climate carbon-cycle models which participated in recent model intercomparisons (such as the Coupled Carbon Cycle Climate Model Intercomparison Project – C4MIP) . There are considerable uncertainties in the rate and extent of permafrost thaw, the hydrological and vegetation response to permafrost thaw, the decomposition timescales of freshly thawed organic material, the proportion of soil carbon that might be emitted as carbon dioxide via aerobic decomposition or as methane via anaerobic decomposition, and in the magnitude of the high latitude amplification of global warming that will drive permafrost degradation. Additionally, there are extensive and poorly characterized regional heterogeneities in soil properties, carbon content, and hydrology. Here, we couple a new permafrost module to a reduced complexity carbon-cycle climate model, which allows us to perform a large ensemble of simulations. The ensemble is designed to span the uncertainties listed above and thereby the results provide an estimate of the potential strength of the feedback from newly thawed permafrost carbon. For the high CO2 concentration scenario (RCP8.5), 33–114 GtC (giga tons of Carbon) are released by 2100 (68 % uncertainty range). This leads to an additional warming of 0.04–0.23 °C. Though projected 21st century permafrost carbon emissions are relatively modest, ongoing permafrost thaw and slow but steady soil carbon decomposition means that, by 2300, about half of the potentially vulnerable permafrost carbon stock in the upper 3 m of soil layer (600–1000 GtC) could be released as CO2, with an extra 1–4 % being released as methane. Our results also suggest that mitigation action in line with the lower scenario RCP3-PD could contain Arctic temperature increase sufficiently that thawing of the permafrost area is limited to 9–23 % and the permafrost-carbon induced temperature increase does not exceed 0.04–0.16 °C by 2300.

scholarly journals Estimating the permafrost-carbon feedback on global warming

2011 ◽  
Vol 8 (3) ◽  
pp. 4727-4761 ◽  
Author(s):  
T. Schneider von Deimling ◽  
M. Meinshausen ◽  
A. Levermann ◽  
V. Huber ◽  
K. Frieler ◽  
...  
Keyword(s):  
Global Warming ◽  
Carbon Cycle ◽  
Soil Carbon ◽  
Temperature Increase ◽  
Climate Model ◽  
Soil Layer ◽  
Ghg Emissions ◽  
Permafrost Degradation ◽  
Uncertainty Range ◽  
Permafrost Thaw

Abstract. Thawing of permafrost and the associated release of carbon constitutes a positive feedback in the climate system, elevating the effect of anthropogenic GHG emissions on global-mean temperatures. Multiple factors have hindered the quantification of this feedback, which was not included in the CMIP3 and C4MIP generation of AOGCMs and carbon cycle models. There are considerable uncertainties in the rate and extent of permafrost thaw, the hydrological and vegetation response to permafrost thaw, the decomposition timescales of freshly thawed organic material, the proportion of soil carbon that might be emitted as carbon dioxide via aerobic decomposition or as methane via anaerobic decomposition, and in the magnitude of the high latitude amplification of global warming that will drive permafrost degradation. Additionally, there are extensive and poorly characterized regional heterogeneities in soil properties, carbon content, and hydrology. Here, we couple a new permafrost module to a reduced complexity carbon-cycle climate model, which allows us to perform a large ensemble of simulations. The ensemble is designed to span the uncertainties listed above and thereby the results provide an estimate of the potential strength of the permafrost-carbon feedback. For the high CO2 concentration scenario (RCP8.5), 12–52 PgC, or an extra 3–11 % above projected net CO2 emissions from land carbon cycle feedbacks, are released by 2100 (68 % uncertainty range). This leads to an additional warming of 0.02–0.11 °C. Though projected 21st century emissions are relatively modest, ongoing permafrost thaw and slow but steady soil carbon decomposition means that, by 2300, more than half of the potentially vulnerable permafrost carbon stock in the upper 3m of soil layer (600–1000 PgC) could be released as CO2, with an extra 1–3 % being released as methane. Our results also suggest that mitigation action in line with the lower scenario RCP3-PD could contain Arctic temperature increase sufficiently that thawing of the permafrost area is limited to 15–30 % and the permafrost-carbon induced temperature increase does not exceed 0.01–0.07 °C by 2300.

scholarly journals Response of psychrophilic plant endosymbionts to experimental temperature increase

2020 ◽  
Vol 7 (12) ◽  
pp. 201405
Author(s):  
Carolina Seas ◽  
Priscila Chaverri
Keyword(s):  
Global Warming ◽  
Temperature Increase ◽  
Fungal Endophytes ◽  
Growth Curves ◽  
High Elevation ◽  
Trophic Levels ◽  
Initial Growth ◽  
Endemic Plant ◽  
Symbiotic Relationships ◽  
Microbial Symbionts

Countless uncertainties remain regarding the effects of global warming on biodiversity, including the ability of organisms to adapt and how that will affect obligate symbiotic relationships. The present study aimed to determine the consequences of temperature increase in the adaptation of plant endosymbionts (endophytes) that grow better at low temperatures (psychrophilic). We isolated fungal endophytes from a high-elevation (paramo) endemic plant, Chusquea subtessellata . Initial growth curves were constructed at different temperatures (4–25°C). Next, experiments were carried out in which only the psychrophilic isolates were subjected to repeated increments in temperature. After the experiments, the final growth curves showed significantly slower growth than the initial curves, and some isolates even ceased to grow. While most studies suggest that the distribution of microorganisms will expand as temperatures increase because most of these organisms grow better at 25°C, the results from our experiments demonstrate that psychrophilic fungi were negatively affected by temperature increases. These outcomes raise questions concerning the potential adaptation of beneficial endosymbiotic fungi in the already threatened high-elevation ecosystems. Assessing the consequences of global warming at all trophic levels is urgent because many species on Earth depend on their microbial symbionts for survival.

Global Warming, Climate Policy, and the Green Paradox

2015 ◽  
pp. 20-38
Author(s):  
Gheorghe H. Popescu ◽  
Elvira Nica
Keyword(s):  
Climate Change ◽  
Economic Growth ◽  
Global Warming ◽  
Climate Policy ◽  
Environmental Quality ◽  
Temperature Increase ◽  
Economic Aspects ◽  
Gas Emissions ◽  
Green Paradox

Scholarship about the role of managed systems when considering the impacts of climate change, the environmental problem arising from polluting-resource use, the economic aspects of strategies to slow climate change, and the connection between climate change and economic growth has increased and consolidated, especially in recent years. The main objective of this chapter is to explore and describe the effects of climate policy on greenhouse gas emissions, the societal aspects of climate change, the technology-based determinants of green growth, and the productivity impacts of environmental quality. The results of the current chapter converge with prior research on the harmful results of climate change, reduced use of polluting inputs as a consequence of environmental policy, the prevailing governmental policies for fighting global warming, and measures to mitigate the temperature increase by reducing CO2 emissions.

scholarly journals Combat the Global Warming by Generating Renewable Sources of Energy

2019 ◽  
pp. 1-4
Author(s):  
PN Darde Mish ◽  
Keyword(s):  
Carbon Dioxide ◽  
Global Warming ◽  
Water Vapor ◽  
Greenhouse Gases ◽  
Temperature Increase ◽  
Renewable Sources ◽  
Average Temperature ◽  
Renewable Sources Of Energy

Global warming is the increase in average temperature of thetheearth’s surface air and oceans. Most of the observed temperature increase is caused by increased concentration of greenhouse gases. Major gases are water vapor (36-70%), carbon dioxide (9-26 %), Methane (4- 9 %) and Ozone (3- 7 %).

scholarly journals Impact of global warming on the distribution of Anastrepha grandis (Diptera: Tephritidae) in Brazil

2020 ◽  
Vol 87 ◽  
Author(s):  
Heitor Lisbôa ◽  
Anderson Dionei Grutzmacher ◽  
Marcos Silveira Wrege ◽  
Flávio Roberto Mello Garcia ◽  
Dori Edson Nava
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Central America ◽  
Temperature Increase ◽  
Southeastern Brazil ◽  
Climate Scenarios ◽  
Intergovernmental Panel ◽  
Climatic Variations ◽  
Pessimistic Scenario ◽  
The Impact

ABSTRACT: Anastrepha grandis is one of the main pests related to Cucurbitaceae in South and Central America. This study discusses the impact of temperature increase on the number of generations of A. grandis, whose distribution could be aggravated due to temperature increase. Climatic variations were analyzed for reference scenarios obtained from 1961‒1990 and of A2 and B1 climatic change scenarios of the Intergovernmental Panel on Climate Change, in which a less pessimistic scenario (B1) and a more pessimistic scenario (A2) were found. In relation to the reference scenarios, in colder seasons, the southern and southeastern regions are inadequate for the development of A. grandis, presenting one generation at most. In other regions of Brazil, where temperatures are higher throughout the year, the number of generations is at least two, and there is no variation from one climatic season to another. When analyzing the temperature increase, in a more pessimistic scenario (A2), there is a considerable variation in the number of generations, if we take into account three future climate scenarios in which A. grandis practically doubles the number of generations. In relation to a less pessimistic scenario (B1), there is a smaller variation in the number of generations, mainly in the southern region of the country. This variation is more accentuated in southeastern Brazil due to the temperature increase, in which the pest’s number of generations doubles even in colder seasons.

scholarly journals Drowning of the Miocene Billund delta, Jylland: land–sea fluctuations during a global warming event

1969 ◽  
Vol 28 ◽  
pp. 9-12 ◽  
Author(s):  
Erik Skovbjerg Rasmussen ◽  
Torsten Utescher ◽  
Karen Dybkjær
Keyword(s):  
Global Warming ◽  
Temperature Increase ◽  
Depositional Environments ◽  
Local Temperature ◽  
Spores And Pollen ◽  
Lower Miocene ◽  
Delta System ◽  
Climatic Record ◽  
Natural Laboratory ◽  
Local Temperature Increase

Lower Miocene strata from boreholes and, in particular, at outcrops in the Lillebælt and Limfjorden areas of Jylland provide a natural laboratory for studying the drowning of a major delta system during a period of global warming. Detailed studies of sedimentary structures, fossil algae, spores and pollen give information about depositional environments, local temperatures and precipitation. By comparing with the global climatic record from the same period, a detailed reconstruction of the flooding of a low-relief delta system can be made, with emphasis on the global warming after the glacial event Mi1a. The local temperature increase following the Mi1a event is estimated to be c. 5°C.

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