Exploring potential drivers of European biomass burning over the Holocene: a data-model analysis

2013 ◽  
Vol 22 (12) ◽  
pp. 1248-1260 ◽  
Author(s):  
Chiara Molinari ◽  
Veiko Lehsten ◽  
Richard H. W. Bradshaw ◽  
Mitchell J. Power ◽  
Peter Harmand ◽  
...  
Keyword(s):  
Biomass Burning ◽  
Data Model ◽  
Model Analysis ◽  
The Holocene

Determinants of Efficiency of Contractors in Hong Kong and China: Panel Data Model Analysis

2013 ◽  
Vol 139 (9) ◽  
pp. 1211-1223 ◽  
Author(s):  
Jing Li ◽  
Yat Hung Chiang ◽  
Tracy N. Y. Choi ◽  
King Fai Man
Keyword(s):  
Hong Kong ◽  
Panel Data ◽  
Data Model ◽  
Model Analysis ◽  
Panel Data Model

Role of vegetation on fire behaviour in Fennoscandia forests during the Holocene

2020 ◽  
Author(s):  
Chiara Molinari ◽  
Richard H.W. Bradshaw ◽  
Christopher Carcaillet ◽  
Gina Hannon ◽  
Veiko Lehsten
Keyword(s):  
Biomass Burning ◽  
Large Scale ◽  
Fire Regime ◽  
Fire Disturbance ◽  
Forest Composition ◽  
Peat Bogs ◽  
Fuel Type ◽  
Strong Negative Correlation ◽  
The Holocene

<p>The relationship between Holocene changes in Fennoscandia biomass burning (reconstructed by means of sedimentary charcoal records from lake and peat bogs) and main forest composition (based on pollen reconstructions from the same sites) divided into three different fire sensitivity classes is explored based on the hypothesis that fire-prone species are more abundant during periods characterized by higher fire disturbance, while fire-intolerant species dominate when biomass burning is low.</p><p>The overall patterns found across Fennoscandia suggest that there was low but increasing fire activity during the early Holocene, while a low and decreasing trend characterized the middle Holocene. During the late Holocene biomass burning increased, with a peak around 500 cal yr BP. This maximum is then followed by a downturn during the last centuries.</p><p>Generally, fire-prone species are strongly positively correlated with multi-millennial variability of biomass burning in Fennoscandia forests. A positive - but much weaker - relationship also exists between fire-tolerant species and long-term fire trends. On the contrary, a quite strong negative correlation is detected between biomass burning and fire-intolerant species.</p><p>The results presented in this large-scale analysis demonstrate that biomass burning was highly linked to fuel type (according to different fire sensitivity classes) during the Holocene, underlying the fact that all past fire-climate studies must consider key functional interactions between fuel type and long-term changes in fire regime.</p>

scholarly journals A Holocene black carbon ice-core record of biomass burning in the Amazon Basin from Illimani, Bolivia

2018 ◽  
Author(s):  
Dimitri Osmont ◽  
Michael Sigl ◽  
Anja Eichler ◽  
Theo M. Jenk ◽  
Margit Schwikowski
Keyword(s):  
Black Carbon ◽  
Biomass Burning ◽  
Amazon Basin ◽  
Ice Core ◽  
Medieval Warm Period ◽  
Warm Period ◽  
The Holocene ◽  
Holocene Climatic Optimum ◽  
Ice Core Record ◽  
Climatic Optimum

Abstract. The Amazon Basin is one of the major contributors to global biomass burning emissions. However, regional paleofire trends remain partially unknown. Due to their proximity to the Amazon Basin, Andean ice cores are suitable to reconstruct paleofire trends in South America and improve our understanding of the complex linkages between fires, climate and humans. Here we present the first refractory black carbon (rBC) ice-core record from the Andes as a proxy for biomass burning emissions in the Amazon Basin, derived from an ice core drilled at 6300 m a.s.l. from Illimani glacier in the Bolivian Andes and spanning the entire Holocene back to the last deglaciation 13 000 years ago. The Illimani rBC record displays a strong seasonality with low values during the wet season and high values during the dry season due to the combination of enhanced biomass burning emissions in the Amazon Basin and less precipitation at the Illimani site. Significant positive (negative) correlations were found with reanalyzed temperature (precipitation) data, respectively, for regions in Eastern Bolivia and Western Brazil characterized by a substantial fire activity. rBC long-term trends indirectly reflect regional climatic variations through changing biomass burning emissions as they show higher (lower) concentrations during warm/dry (cold/wet) periods, respectively, in line with climate variations such as the Younger Dryas, the 8.2 ka event, the Holocene Climatic Optimum, the Medieval Warm Period or the Little Ice Age. The highest rBC concentrations of the entire record occurred during the Holocene Climatic Optimum between 7000 and 3000 BC, suggesting that this outstanding warm and dry period caused an exceptional biomass burning activity, unprecedented in the context of the past 13 000 years. Recent rBC levels, rising since 1730 AD in the context of increasing temperatures and deforestation, are similar to those of the Medieval Warm Period. No decrease was observed in the 20th century, in contradiction with the global picture (broken fire hockey stick hypothesis).

Improving the reliability of automation systems using data model analysis

2021 ◽  
Author(s):  
A. I. Baranchikov ◽  
I. I. Yakovlev ◽  
Yu. V. Redkin
Keyword(s):  
Data Model ◽  
Model Analysis ◽  
Automation Systems ◽  
Using Data

scholarly journals Nighttime Chemical Transformation in Biomass Burning Plumes: A Box Model Analysis Initialized with Aircraft Observations

2019 ◽  
Vol 53 (5) ◽  
pp. 2529-2538 ◽  
Author(s):  
Zachary C. J. Decker ◽  
Kyle J. Zarzana ◽  
Matthew Coggon ◽  
Kyung-Eun Min ◽  
Ilana Pollack ◽  
...  
Keyword(s):  
Chemical Transformation ◽  
Biomass Burning ◽  
Model Analysis ◽  
Box Model ◽  
Aircraft Observations

scholarly journals Nesting Effects of Climate and Local Drivers on Long-Term Subalpine Fires in the Alps

2021 ◽  
Author(s):  
Christopher Carcaillet ◽  
Benjamin Boulley ◽  
Frédérique Carcaillet
Keyword(s):  
Biomass Burning ◽  
Large Scale ◽  
Fire History ◽  
Fire Regime ◽  
Western Alps ◽  
Biomass Combustion ◽  
Human Society ◽  
The Holocene ◽  
Soil Charcoal

Abstract Background: The present article questions the relative importance of local- and large-scale processes on the long-term dynamics of fire in the subalpine belt in the western Alps. The study is based on soil charcoal dating and identification, several study sites in contrasting environmental conditions, and sampling of soil charcoal along the elevation gradient of each site. Based on local differences in biomass combustion, we hypothesize that local-scale processes have driven the fire history, while combustion homogeneity supports the hypothesis of the importance of large-scale processes, especially the climate. Results: The results show that biomass burning during the Holocene resulted from the nesting effects of climate, land use, and altitude, but was little influenced by topography (slope exposure: north versus south), soil (dryness, pH, depth), and vegetation. The mid-Holocene (6500–2700 cal BP) was an important period for climatic biomass burning in the subalpine ecosystems of the western Alps, while fires from about 2500 years ago appear much more episodic, prompting us to speculate that human society has played a vital role in their occurrence. Conclusion: Our working hypothesis assuming that the strength of mountain natural and local drivers should offset the effects of regional climate is not validated. The homogeneity of the fire regime between sites thus underscore that climate was the main driver during the Holocene of the western Alps. Long-term subalpine fires are controlled by climate at millennial scale. Local conditions count for little in determining variability at the century scale. The mid-Holocene was a chief period for climatic biomass burning in the subalpine zone, while fires during the late Holocene appear much more episodic, prompting the assumption that societal drivers has exercised key roles on their control.

Effects of atmospheric transformations of the organic fraction of biomass burning aerosol on the radiative forcing: a box model analysis

2021 ◽  
Author(s):  
Igor B. Konovalov ◽  
Nikolai A. Golovushkin ◽  
Tatyana B. Zhuravleva ◽  
Ilmir M. Nastrdinov ◽  
Daria A. Lvova ◽  
...  
Keyword(s):  
Biomass Burning ◽  
Radiative Forcing ◽  
Model Analysis ◽  
Box Model ◽  
Organic Fraction ◽  
Biomass Burning Aerosol
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