Sentences with phrase «of hyperthermals»

Her main research interest is in exploring the links between extinction, carbon emission, global warming and the triggers of hyperthermals.

A growing body of evidence from the most prominent of the hyperthermals, the Paleocene Thermal Maximum (PETM; ~ 56 Ma), points toward a major mode shift in the intensity and patterns of precipitation.

Finally, we use the largest and best documented of the hyperthermals, the PETM, to test the reasonableness of the Russell state - dependent climate sensitivity.

The authors believe their research helps pin the cause of hyperthermals on long - term rhythms in the CO2 cycle for that 10 million year period.

Not exact matches

These features, they noted, are very similar to the geologic leftovers of the PETM and other hyperthermal events.

«I am so happy that more of these types of nanoparticle - based hyperthermal therapies are being developed to increase the arsenal of weapons against cancer.»

«No other terrestrial record exists with the density of fossils necessary to test faunal response to the later hyperthermals [climatic warming].

These so - called «modest hyperthermals» (meaning a rapid, pronounced period of global warming) had shorter durations and recoveries (about a 40,000 year cycle) and involved an exchange of carbon between surface reservoirs into the atmosphere and then into sediment.

The average rate of injection of carbon into the climate system during these hyperthermals was slower than the present human - made injection of fossil fuel carbon, yet it was faster than the time scale for removal of carbon from the surface reservoirs via the weathering process [3], [208], which is tens to hundreds of thousands of years.

Climate model studies and empirical analyses of paleoclimate data can provide estimates of the amplification of climate sensitivity caused by slow feedbacks, excluding the singular mechanisms that caused the hyperthermal events.

The discovery of other, smaller magnitude, rapid greenhouse warming events (called hyperthermals) in the millions of years following the PETM provides further opportunities to examine the response of organisms to global climate change.

The resort offers spacious beach strip, 1 km long and 20 m - 80 m wide, a calm sea with sandy bottom that gradually becomes deeper, a natural park with rare tree species and curative mineral waters springs with temperature of 45 ° С, low mineral content, hyperthermal, hydrocarbonic, with traces of calcium, sodium, magnesium, sulphides, chlorides.

Is methane, and the CO2 it produces, the most likely source of carbon for past hyperthermals?

It is the acidic nature of the oceans which is the tell - tale signal for a hyperthermal event.

In the case of the PETM and other Cenozoic hyperthermals, the CO2 may be the initial cause, so it would be treated as a forcing rather than a feedback.

This CO2 - driven acidification of the oceans is already under way in our own epoch of global warming - and that same oceanic response in the past coincides with massive rises in temperature - the hyperthermal.

They are called hyperthermals - periods of intense and sudden rises in temperature, lasting tens of thousands of years.

Starting 50 million years ago, these hyperthermal events seem to have been triggered every 400,000 years, and involved temperature rises of 3 F to 5 F (2 C to 3 C) that lasted up to 40,000 years.

The current thinking is that the PETM is not likely an orbitally forced event even if some of the subsequent hyperthermals may have been.

We also include in the category of slow feedbacks the global warming spikes, or «hyperthermals», that have occurred a number of times in Earth's history during the course of slower global warming trends.

Climate model studies and empirical analyses of paleoclimate data can provide estimates of the amplification of climate sensitivity caused by slow feedbacks, excluding the singular mechanisms that caused the hyperthermal events.

The mechanisms behind these hyperthermals are poorly understood, as discussed below, but they are characterized by the injection into the surface climate system of a large amount of carbon in the form of CH4 and / or CO2 on the time scale of a millennium [205]--[207].

Regardless of the carbon source (s), it has been shown that the hyperthermals were astronomically paced, spurred by coincident maxima in the Earth's orbit eccentricity and spin axis tilt [17], which increased high - latitude insolation and warming.

Superimposed on the long - term trends are occasional global warming spikes, «hyperthermals», most prominently the Palaeocene — Eocene Thermal Maximum (PETM) at approximately 56 Myr BP [12] and the Mid-Eocene Climatic Optimum at approximately 42 Myr BP [13], coincident with large temporary increases of atmospheric CO2.

Here we combine new and published geochronological data for tectonic - magmatic events recorded along the Greenland continental rifted margin to test the hypothesis that the origin of the main Cenozoic hyperthermals, including the PETM, is rooted in plate tectonic, metamorphic and volcanic processes in the North Atlantic region.

This presentation will show evidence that the non-PETM hyperthermals were triggered by orbital pacing of the regular processes that readily redistribute carbon between reservoirs at Earth's surface.

The climate history of the early Cenozoic is distinguished by multiple short - lived warming events (hyperthermals) that followed large - scale addition of C - based greenhouse gases into the ocean - atmosphere system.

The similarities of these other hyperthermals with the PETM were taken as being suggestive of a common mechanism (s) giving rise to them all.

The role of proxies in further refining our ability extract further insights from early Cenozoic hyperthermals and other warm climates will be emphasized.

The breakup of Pangaea was accompanied by biogeochemical disturbances including the largest magnitude perturbation of the carbon - cycle in the last 200 Myr, coeval with the now well - characterised hyperthermal, the Toarcian Oceanic Anoxic Event (T - OAE).

We still do not know what processes triggered hyperthermals, the source (s) of carbon released, and their wider Earth system impacts.

The Oceanic Anoxic Events (OAEs) of the Cretaceous represent one of the largest climatic perturbations of the Phanerozoic and share characteristics with the Cenozoic hyperthermals.

Through the Integrated Early Jurassic Timescale and Earth System project (JET), a multi-faceted, international programme of research on the functioning of the Earth system, new data from the old Mochras core will be combined with data from a new core to provide an understanding of global change and quantify the roles of tectonic, palaeoceanographic, and astronomical forcing on hyperthermal (and hypothermal) events at this key juncture in Earth history.

It will be valuable for future studies to understand the magnitude, rate, and relative temporal phasing of redox changes as they are expressed in spatially diverse locations, in order to provide constraints on the heterogeneity of climatically important feedback processes operating during the PETM, and other hyperthermals.

These controls are extremely similar to those highlighted as critical drivers of anoxia during the Mesozoic Oceanic Anoxic Events, suggesting that the PETM should be considered in a similar vein to these older hyperthermals.

The early Eocene hyperthermals, a series of transient global warming events (2 to 5 °C, provide a unique opportunity to assess the sensitivity of the hydrologic cycle to the scale of greenhouse forcing expected over the next several centuries.

It's not clear boreal feedbacks are even necessary to lighting off tropical biomass (fire once again), but they'll certainly speed the process way up; if that does happen in turn we're on our way to a hyperthermal (with some lag since the oceans have to warm enough to trigger a self - sustaining loss of shallow methane hydrates).