scholarly journals Holocene climate and environmental change in the Palliser Triangle: a geoscientific context for evaluation the impacts of climate change on the southern Canadian prairies

1999 ◽  
Author(s):  
D S Lemmen ◽  
R E Vance
Keyword(s):  
Climate Change ◽  
Environmental Change ◽  
Holocene Climate ◽  
Canadian Prairies ◽  
Climate And Environmental Change ◽  
Palliser Triangle ◽  
Impacts Of Climate Change

scholarly journals Complexity of diatom response to Lateglacial and Holocene climate and environmental change in ancient, deep and oligotrophic Lake Ohrid (Macedonia and Albania)

2016 ◽  
Vol 13 (4) ◽  
pp. 1351-1365 ◽  
Author(s):  
X. S. Zhang ◽  
J. M. Reed ◽  
J. H. Lacey ◽  
A. Francke ◽  
M. J. Leng ◽  
...  
Keyword(s):  
Environmental Change ◽  
Water Temperature ◽  
Nutrient Availability ◽  
Future Research ◽  
Lake Ohrid ◽  
Nutrient Input ◽  
Holocene Climate ◽  
Lake Productivity ◽  
Climate And Environmental Change ◽  
Response To Temperature

Abstract. Lake Ohrid (Macedonia and Albania) is a rare example of a deep, ancient Mediterranean lake and is a key site for palaeoclimate research in the northeastern Mediterranean region. This study conducts the analysis of diatoms as a proxy for Lateglacial and Holocene climate and environmental change in Lake Ohrid at a higher resolution than in previous studies. While Lake Ohrid has the potential to be sensitive to water temperature change, the data demonstrate a highly complex diatom response, probably comprising a direct response to temperature-induced lake productivity in some phases and an indirect response to temperature-related lake stratification or mixing and epilimnetic nutrient availability in others. The data also demonstrate the possible influence of physical limnological (e.g. the influence of wind stress on stratification or mixing) and chemical processes (e.g. the influence of catchment dynamics on nutrient input) in mediating the complex response of diatoms. During the Lateglacial (ca. 12 300–11 800 cal yr BP), the low-diversity dominance of hypolimnetic Cyclotella fottii indicates low lake productivity, linked to low water temperature. Although the subsequent slight increase in small, epilimnetic C. minuscula during the earliest Holocene (ca. 11 800–10 600 cal yr BP) suggests climate warming and enhanced stratification, diatom concentration remains as low as during the Lateglacial, suggesting that water temperature increase was muted across this major transition. The early Holocene (ca. 10 600–8200 cal yr BP) is characterised by a sustained increase in epilimnetic taxa, with mesotrophic C. ocellata indicating high water-temperature-induced productivity between ca. 10 600–10 200 cal yr BP and between ca. 9500–8200 cal yr BP and with C. minuscula in response to low nutrient availability in the epilimnion between ca. 10 200–9500 cal yr BP. During the middle Holocene (ca. 8200–2600 cal yr BP), when sedimentological and geochemical proxies provide evidence for maximum Holocene water temperature, anomalously low C. ocellata abundance is probably a response to epilimnetic nutrient limitation, almost mimicking the Lateglacial flora apart from the occurrence of mesotrophic Stephanodiscus transylvanicus in the hypolimnion. During the late Holocene (ca. 2600 cal yr BP–present), high abundance and fluctuating composition of epilimnetic taxa are probably a response more to enhanced anthropogenic nutrient input, particularly nitrogen enrichment, than to climate. Overall, the data indicate that previous assumptions concerning the linearity of diatom response in this deep, ancient lake are invalid, and multi-proxy analysis is essential to improve understanding of palaeolimnological dynamics in future research on the long, Quaternary sequence.

Education on Global Climate and Environmental Change in University of China

2013 ◽  
Vol 838-841 ◽  
pp. 3195-3198
Author(s):  
Jian Cheng Kang ◽  
Xiaochen Su
Keyword(s):  
Climate Change ◽  
Environmental Change ◽  
Environmental Changes ◽  
Global Climate ◽  
Earth System ◽  
Ecological Civilization ◽  
Environment Change ◽  
Climate And Environmental Change ◽  
The Earth ◽  
Normal University

Global Climate and Environmental Change is an international hot field. To enhance native awareness on climate change is one mission of "State Policy and Action on Climate Change 2009 in China". As an implement, a course on Global Climate and Environmental Change has been opened in Shanghai Normal University since 2005. The course includes three fields. In the first field, it is introduced on which problems and harms have been caused from Global Climate and Environmental Changes according to UNEP Year Books 2003~2013. In the second field, to introduce the Earth System and Climate-Environment Change. In the third part, the hot climate-environmental issues are analyzed and discussed. By joining this course, the students have understanding earth system science and global change. It helped students to set up the view of ecological civilization of the harmonious development between human and nature, inspire students responsibility to protect the earth. During past 8 year, there were 4 to 5 classes opening for different levels in Shanghai Normal University for each year, more than 1000 students joined the study in the course.

Holocene climate and environmental change in central New York (USA)

2011 ◽  
Vol 45 (2) ◽  
pp. 243-256 ◽  
Author(s):  
Henry T. Mullins ◽  
William P. Patterson ◽  
Mark A. Teece ◽  
Adam W. Burnett
Keyword(s):  
New York ◽  
Environmental Change ◽  
Holocene Climate ◽  
Climate And Environmental Change ◽  
Central New York

A paleolimnological record of Holocene climate and environmental change in the Temagami region, northeastern Ontario

2005 ◽  
Vol 33 (4) ◽  
pp. 445-461 ◽  
Author(s):  
Robert E. A. Boudreau ◽  
Jennifer M. Galloway ◽  
R. Timothy Patterson ◽  
Arun Kumar ◽  
Frederick A. Michel
Keyword(s):  
Environmental Change ◽  
Holocene Climate ◽  
Climate And Environmental Change

scholarly journals Projected Impacts of Climate Change on the Physical and Biogeochemical Environment in Southeast Asian Seas

2021 ◽  
Author(s):  
Susan Kay ◽  
Arlene L. Avillanosa ◽  
Victoria V. Cheung ◽  
Ngoc Hung Dao ◽  
Benjamin J. Gonzales ◽  
...  
Keyword(s):  
Climate Change ◽  
Environmental Change ◽  
21St Century ◽  
Regional Scale ◽  
Coastal Communities ◽  
Small Scale ◽  
Biogeochemical Model ◽  
Temperature Changes ◽  
Natural Systems ◽  
Impacts Of Climate Change

Abstract The seas of Southeast Asia are home to some of the world’s most diverse ecosystems and resources that support the livelihoods and wellbeing of millions of people. Climate change will bring temperature changes, acidification and other environmental change, with uncertain consequences for human and natural systems in the region. We present the first regional-scale projections of change in the marine environment up to the end of 21st century. A coupled physical-biogeochemical model with a resolution of 0.1° (approximately 11 km) was used to create projections of future environmental conditions under two greenhouse gas scenarios, RCP4.5 and RCP8.5. These show a sea that is warming by 1.1–2.9°C through the 21st century, with surface pH falling by up to 0.02 and dissolved oxygen decreasing by 5 to 13 mmol m− 3. Changes for different parts of the region, including four sensitive coastal sites, are presented. The changes reach all parts of the water column and many places are projected to experience conditions well outside the range seen at the start of the century. Altered species distribution and damage to coral reefs resulting from this environmental change would have consequences for biodiversity, for the livelihoods of small-scale fishers and for the food security of coastal communities across the region. Projections of this type are a key tool for communities planning how they will adapt to the challenge of climate change.

scholarly journals Contribution of orbital forcing and Deccan volcanism to global climatic and biotic changes across the Cretaceous-Paleogene boundary at Zumaia, Spain

Geology ◽  
2021 ◽  
Author(s):  
Vicente Gilabert ◽  
Sietske J. Batenburg ◽  
Ignacio Arenillas ◽  
José A. Arz
Keyword(s):  
Climate Change ◽  
Environmental Change ◽  
Orbital Forcing ◽  
Deccan Volcanism ◽  
Climate And Environmental Change ◽  
Temporal Relationships ◽  
Age Model ◽  
Chicxulub Impact ◽  
Age Constraints

Untangling the timing of the environmental effects of Deccan volcanism with respect to the Chicxulub impact is instrumental to fully assessing the contributions of both to climate change over the Cretaceous-Paleogene boundary (KPB) interval. Despite recent improvements in radiometric age calibrations, the accuracy of age constraints and correlations is insufficient to resolve the exact mechanisms leading to environmental and climate change in the 1 m.y. across the KPB. We present new high-resolution planktic foraminiferal, geochemical, and geophysical data from the Zumaia section (Spain), calibrated to an updated orbitally tuned age model. We provide a revised chronology for the major carbon isotope excursions (CIEs) and planktic foraminiferal events and test temporal relationships with different models of the eruptive phases of the Deccan Traps. Our data show that the major CIEs near the KPB, i.e., the late Maastrichtian warming event (66.25–66.10 Ma) and the Dan-C2 event (65.8–65.7 Ma), are synchronous with the last and the first 405 k.y. eccentricity maximum of the Maastrichtian and the Danian, respectively, and that the minor Lower C29n event (65.48–65.41 Ma) is well constrained to a short eccentricity maximum. Conversely, we obtained evidence of abrupt environmental change likely related to Deccan volcanism at ca. 65.9 Ma, based on a bloom of opportunistic triserial guembelitriids (Chiloguembelitria). The orbital, isotopic, and paleobiological temporal relationships with Deccan volcanism established here provide new insights into the role of Deccan volcanism in climate and environmental change in the 1 m.y. across the KPB.

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