Abrupt climate change and variability in the past four millennia of the southern Vancouver Island, Canada

2005 ◽  
Vol 32 (16) ◽  
Author(s):  
Qi-Bin Zhang
Keyword(s):  
Climate Change ◽  
Vancouver Island ◽  
Abrupt Climate Change ◽  
Climate Change And Variability ◽  
The Past

Use of productivity-defined indicators to assess exposure of grassland-based livestock systems to climate change and variability

2013 ◽  
Vol 64 (7) ◽  
pp. 641 ◽  
Author(s):  
Marion Sautier ◽  
Michel Duru ◽  
Roger Martin-Clouaire
Keyword(s):  
Climate Change ◽  
Production Systems ◽  
Weather Conditions ◽  
Climate Change Research ◽  
Climate Change And Variability ◽  
The Past ◽  
The Future ◽  
The Difference ◽  
Livestock Systems ◽  
Agricultural Production Systems

Climate change research that aims to accelerate the adaptation process of agricultural production systems first requires understanding their climatic vulnerability, which is in part characterised by their exposure. This paper’s approach moves beyond traditional metrics of climate variables and proposes specific indicators for grassland-based livestock systems. The indicators focus on the variation in seasonal boundaries and seasonal and yearly herbage productivity in response to weather conditions. The paper shows how statistical interpretations of these indicators over several sites and climatic years (past and future) enable the characterisation of classes of climatic years and seasons as well as their frequencies of occurrence and their variation from the past to the expected future. The frequency of occurrence and succession of seasonal extremes is also examined by analysing the difference between observed or predicted seasonal productivity and past mean productivity. The data analysis and corresponding statistical graphics used in our approach can help farmers, advisers, and scientists envision site-specific impacts of climate change on herbage production patterns. An illustrative analysis is performed on three sites in south-western France using a series of climatic years covering two 30-year periods in the past and the future. We found that the herbage production of several clusters of climatic years can be identified as ‘normal’ (i.e. frequent) and that the most frequent clusters in the past become less common in the future, although some clusters remain common. In addition, the year-to-year variability and the contrast between spring and summer–fall (autumn) herbage production are expected to increase.

scholarly journals Transition process of abrupt climate change based on global sea surface temperature over the past century

2016 ◽  
Vol 23 (3) ◽  
pp. 115-126 ◽  
Author(s):  
Pengcheng Yan ◽  
Wei Hou ◽  
Guolin Feng
Keyword(s):  
Climate Change ◽  
Climate Changes ◽  
Transition Process ◽  
Sea Surface ◽  
Abrupt Climate Change ◽  
Past Century ◽  
The Past ◽  
The Relationship ◽  
Global Sea Surface Temperature ◽  
State Moment

Abstract. A new detection method has been proposed to study the transition process of abrupt climate change. With this method, the climate system transiting from one stable state to another can be verified clearly. By applying this method to the global sea surface temperature over the past century, several climate changes and their processes are detected, including the start state (moment), persist time, and end state (moment). According to the spatial distribution, the locations of climate changes mainly have occurred in the Indian Ocean and western Pacific before the middle twentieth century, in the 1970s in the equatorial middle-eastern Pacific, and in the middle and southern Pacific since the end of the twentieth century. In addition, the quantitative relationship between the transition process parameters is verified in theory and practice: (1) the relationship between the rate and stability parameters is linear, and (2) the relationship between the rate and change amplitude parameters is quadratic.

scholarly journals Transition process of abrupt climate change based on global sea surface temperature over the past century

2016 ◽  
Author(s):  
Pengcheng Yan ◽  
Wei Hou ◽  
Guolin Feng
Keyword(s):  
Climate Change ◽  
Climate Changes ◽  
Transition Process ◽  
Sea Surface ◽  
Abrupt Climate Change ◽  
Past Century ◽  
The Past ◽  
The Relationship ◽  
Global Sea Surface Temperature ◽  
State Moment

Abstract. We propose a new concept of abrupt climate change transition and create a novel detection method to identify the transition process. With this method, how the climate system transits from one stable state to another could be verified clearly. By applying this method to the global sea surface temperature data over the past century, several climate change processes are detected, including their starting state (moment), persist time, and ending state (moment) etc. According to the spatial distributions, the locations of climate changes mainly occurred in Indian ocean and western Pacific before the middle twentieth century, while the climate changes in 1970s located in equatorial middle-eastern Pacific, and the climate changes happened in the middle and southern Pacific since the end twentieth century. In addition, an quantitative relationship among the transition process parameters has been exposed in theory and practice, which the relationship between the rate and stability parameters is linear, and the relationship between the rate and change amplitude parameters is quadratic.

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