Search Results - "Vachula, Richard S"

The timing of fireworks-caused wildfire ignitions during the 4th of July holiday season by Vachula, Richard S., Nelson, Jake R., Hall, Anthony G.

“…Although anthropogenic climate change is causing increased wildfire activity in the United States (US), humans are also an important ignition source. Humans…”
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Pre‐Industrial (1750–1850 CE) Cold Season Warmth in Northeastern China by Yao, Yuan, Wang, Lu, Huang, Yongsong, Liang, Jie, Vachula, Richard S., Cai, Yanjun, Cheng, Hai

“…Contrary to global warming projections, northern mid‐latitude continents have suffered from an increased frequency of unusually cold winters during the last…”
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Fire in Feces: Bats Reliably Record Fire History in Their Guano by Tsalickis, Alexandra, Vachula, Richard S., Welch, J. Conner, Campbell, Joshua W., Waters, Matthew N.

“…New approaches are needed to resolve persistent geographic gaps and biases in paleofire research. Most sedimentary paleofire research relies on lake and peat…”
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Electron probe microanalysis of the elemental composition of phytoliths from woody bamboo species by Tan, Shuhui, Li, Rencheng, Vachula, Richard S, Tao, Xinyue, Wen, Mengdan, Liu, Yizhi, Dong, Haiyan, Zhou, Lintong

“…Electron probe microanalysis (EPMA) is promising for accurately determining elemental components in micro-areas of individual phytolith particles, interpreting…”
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Climate exceeded human management as the dominant control of fire at the regional scale in California's Sierra Nevada by Vachula, Richard S, Russell, James M, Huang, Yongsong

“…The societal impacts of recent, severe fires in California highlight the need to understand the long-term effectiveness of human fire management. The relative…”
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A Meta‐Analysis of Studies Attributing Significance to Solar Irradiance by Vachula, Richard S., Cheung, Anson H.

“…The relationship between solar irradiance and climate is greatly debated. This inferred relationship is often characterized via the statistical analysis of…”
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Unexpected cold season warming during the Little Ice Age on the northeastern Tibetan Plateau by Yao, Yuan, Wang, Lu, Li, Xiangzhong, Cheng, Hai, Cai, Yanjun, Vachula, Richard S., Liang, Jie, Li, Hanying, Liu, Guangxin, Zhao, Jingyao, Zhang, Haiwei, Li, Qiang

“…Abstract There is a general agreement that Northern Hemisphere temperatures have cooled over the past two millennia, culminating in the Little Ice Age…”
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A usage-based size classification scheme for sedimentary charcoal by Vachula, Richard S

“…Terms referring to charcoal particle size classifications are inconsistent in the paleofire literature. Inconsistencies of terminology prevent effective…”
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Modeled dispersal patterns for wood and grass charcoal are different: Implications for paleofire reconstruction by Vachula, Richard S, Rehn, Emma

“…Sedimentary charcoal records provide useful perspectives on the long-term controls and behavior of fire in the Earth System. However, a comprehensive…”
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Informing sedimentary charcoal-based fire reconstructions with a kinematic transport model by Vachula, Richard S, Richter, Nora

“…Recent changes in global fire activity and future projections can be attributed to a combination of direct human impacts and indirect effects of anthropogenic…”
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The DiSCPersal model: A simple model for the small-scale atmospheric transport of spheroidal carbonaceous particles (SCPs) by Vachula, Richard S., Ojeda, Ann Sullivan, Henderson, Emma D., Inoue, Jun

“…Spheroidal carbonaceous particles (SCPs) are atmospherically mobile by-products of anthropogenic, high-temperature fossil fuel combustion. Since they are…”
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Evidence of Ice Age humans in eastern Beringia suggests early migration to North America by Vachula, Richard S., Huang, Yongsong, Longo, William M., Dee, Sylvia G., Daniels, William C., Russell, James M.

“…Our understanding of the timing and pathway of human arrival to the Americas remains an important and polarizing topic of debate in archaeology and…”
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Systematic chemotaxonomic profiling and novel paleotemperature indices based on alkenones and alkenoates: Potential for disentangling mixed species input by Zheng, Yinsui, Heng, Patrick, Conte, Maureen H., Vachula, Richard S., Huang, Yongsong

“…•Reexamination of alkenones and alkenoates in Isochrysidales using novel methods.•Comprehensive analysis of up to 32 alkenones and alkenoates in batch…”
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Phylogeny, alkenone profiles and ecology of Isochrysidales subclades in saline lakes: Implications for paleosalinity and paleotemperature reconstructions by Yao, Yuan, Zhao, Jiaju, Vachula, Richard S., Liao, Sian, Li, Gaoyuan, Pearson, Emma J., Huang, Yongsong

“…Long-chain alkenones (LCAs) produced by phylogenetically classified Groups 1 and 3 Isochrysidales are increasingly used for paleotemperature and/or…”
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Charcoal morphologies and morphometrics of a Eurasian grass-dominated system for robust interpretation of past fuel and fire type by Feurdean, Angelica, Vachula, Richard S, Hanganu, Diana, Stobbe, Astrid, Gumnior, Maren

“…Recent developments in morphological and morphometric analyses of charcoal particles have improved our ability to discern characteristics of burnt plant fuel…”
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Phytolith‐occluded carbon in leaves of Dendrocalamus Ronganensis influenced by drought during growing season by Li, Rencheng, Chen, Xiaofang, Wen, Mengdan, Vachula, Richard S., Tan, Shuhui, Dong, Haiyan, Zhou, Lintong, Gu, Zhitao, Xu, Mengtong

“…Being an important carbon (C) sink, phytolith‐occluded carbon (PhytOC) has been investigated in various soil–plant systems. However, the effects of…”
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Abrupt Freshening Since the Early Little Ice Age in Lake Sayram of Arid Central Asia Inferred From an Alkenone Isomer Proxy by Yao, Yuan, Lan, Jianghu, Zhao, Jiaju, Vachula, Richard S., Xu, Hai, Cai, Yanjun, Cheng, Hai, Huang, Yongsong

“…Hydroclimatic variations of arid central Asia (ACA) significantly impact regional ecosystems and human civilizations. Here we present a lake water salinity…”
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Morphometric characteristics of charcoal produced from plants native to the southeastern United States of America (USA) by Vachula, Richard S, Cullen, Thomas M, Galinger, Matthew R, Welch, J Conner, Battaglia, Jeremiah, Smith, Dallyn, Waters, Matthew N

“…Charcoal shape variations provide insight into past fuel types burned, with charcoal length:width (L:W) being the most popular means of distinguishing fuel…”
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Burned phytoliths absorbing black carbon as a potential proxy for paleofire by Dong, Haiyan, Wei, Xiaobei, Li, Rencheng, Vachula, Richard S, Tan, Shuhui, Zhou, Lintong, Gan, Tianxi

“…Developing and refining fire proxies is paramount for reliable reconstructions and the inferences that they gain about fire in the Earth System. Burned…”
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Trends in sedimentary charcoal shapes correspond with broad-scale land-use changes: insights gained from a 300-year lake sediment record from eastern Virginia, USA by Frank-DePue, Lee, Vachula, Richard S., Balascio, Nicholas L., Cahoon, Kayla, Kaste, James M.

“…Sedimentary charcoal is a useful fire proxy. Recent advances in the morphological and morphometric analyses of individual charcoal particles have enabled more…”
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