ORCID Profile
0000-0002-8504-8470
Current Organisation
US Geological Survey
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Publisher: American Astronomical Society
Date: 02-04-2019
Publisher: American Geophysical Union (AGU)
Date: 04-2023
DOI: 10.1029/2023JF007184
Abstract: Fire has always been an important component of many ecosystems, but anthropogenic global climate change is now altering fire regimes over much of Earth's land surface, spurring a more urgent need to understand the physical, biological, and chemical processes associated with fire as well as its effects on human societies. In 2020, AGU launched a Special Collection that spanned 10 journals, soliciting papers under the theme “Fire in the Earth System” to encourage state‐of‐the‐art publications in fire‐related science. The completed Special Collection comprises more than 100 papers. Here, we summarize the articles published in this collection, considering them to be grouped into seven themes: paleofire and its ties to climate evolution of fire patterns in the recent past and the future, including the effects of ongoing climate change physical (atmospheric) and chemical processes associated with fire ecosystem effects, including on biogeochemical cycles physical landscape change after fire and its associated hazards fire effects on water quality, air quality, and human health and new methods and technologies applied to fire research.
Publisher: American Astronomical Society
Date: 03-08-2018
Publisher: American Astronomical Society
Date: 11-11-2016
Publisher: American Astronomical Society
Date: 07-08-2020
Publisher: American Astronomical Society
Date: 18-07-2017
Publisher: American Astronomical Society
Date: 29-11-2018
Publisher: Oxford University Press (OUP)
Date: 17-07-2019
Abstract: We report the discovery of SMSS J160540.18−144323.1, a new ultra metal-poor halo star discovered with the SkyMapper telescope. We measure $\\left[\\rm {Fe}/\\rm {H}\\right]= -6.2 \\pm 0.2$ (1D LTE), the lowest ever detected abundance of iron in a star. The star is strongly carbon-enhanced, $\\left[\\rm {C}/\\rm {Fe}\\right] = 3.9 \\pm 0.2$, while other abundances are compatible with an α-enhanced solar-like pattern with $\\left[\\rm {Ca}/\\rm {Fe}\\right] = 0.4 \\pm 0.2$, $\\left[\\rm {Mg}/\\rm {Fe}\\right] = 0.6 \\pm 0.2$, $\\left[\\rm {Ti}/\\rm {Fe}\\right] = 0.8 \\pm 0.2$, and no significant s- or r-process enrichment, $\\left[\\rm {Sr}/\\rm {Fe}\\right] \\lt 0.2$ and $\\left[\\rm {Ba}/\\rm {Fe}\\right] \\lt 1.0$ (3σ limits). Population III stars exploding as fallback supernovae may explain both the strong carbon enhancement and the apparent lack of enhancement of odd-Z and neutron-capture element abundances. Grids of supernova models computed for metal-free progenitor stars yield good matches for stars of about $10\\, \\rm M_\\odot$ imparting a low kinetic energy on the supernova ejecta, while models for stars more massive than roughly $20\\, \\rm M_\\odot$ are incompatible with the observed abundance pattern.
Publisher: American Astronomical Society
Date: 29-08-2018
Publisher: American Astronomical Society
Date: 12-10-2020
Location: United States of America
No related grants have been discovered for Rana Ezzeddine.