Sentences with phrase «by terrestrial sources»

«This work highlights the fact that even with thoughtful and careful contamination control efforts, trace organics in extraterrestrial samples can be overwhelmed by terrestrial sources,» said Elsila.

Not exact matches

It also detected perchlorate, an energy source used by some terrestrial microbes.

It is possible to reconstruct past precipitation changes by measuring the stable hydrogen isotopic composition in terrestrial plant waxes because rainfall is the primary source of hydrogen stored in plant material.

Similarly, meerkats, Suricata suricatta, respond to aerial predator alarm calls by freezing, scanning and running for cover, and to terrestrial predator alarm calls by moving towards the sound source while scanning the area [3].

Lafferty started out believing from review of previous published literature that «infectious disease was preventing the recovery of sea otters, and the most likely source of infection of Toxoplasma gondii was terrestrial runoff containing oocysts defecated by cats,» but when he and colleagues tagged 135 California sea otters in 2009 and followed them for four years, they found that «Counter to expectations, sea otters from unpopulated stretches of coastline,» around Big Sur, are less healthy and more exposed to parasites than city - associated otters,» from the Monterey Bay area, who have more exposure to fecal matter from cats.

By 2100, the ocean uptake rate of 5 Gt C yr - 1 is balanced by the terrestrial carbon source, and atmospheric CO2 concentrations are 250 p.p.m.v. higher in our fully coupled simulation than in uncoupled carbon models2, resulting in a global - mean warming of 5.5 K, as compared to 4 K without the carbon - cycle feedbacBy 2100, the ocean uptake rate of 5 Gt C yr - 1 is balanced by the terrestrial carbon source, and atmospheric CO2 concentrations are 250 p.p.m.v. higher in our fully coupled simulation than in uncoupled carbon models2, resulting in a global - mean warming of 5.5 K, as compared to 4 K without the carbon - cycle feedbacby the terrestrial carbon source, and atmospheric CO2 concentrations are 250 p.p.m.v. higher in our fully coupled simulation than in uncoupled carbon models2, resulting in a global - mean warming of 5.5 K, as compared to 4 K without the carbon - cycle feedback.

In both scenarios the current global sink deteriorates after 2030, and by 2070 (ΔT ~ 2.5 °C over pre-industrial) the terrestrial biosphere becomes an increasing carbon source (Figure 4.2; see also Scholze et al., 2006) with the concomitant risk of positive feedback, developments that amplify climate change.

By contrast, in mid - to high latitudes on all continents, substantial shifts in forest structure toward more rain - green, summer - green or deciduous rather than evergreen forest, and forest and woodland decline, underlie the overall drop in global terrestrial carbon sequestration potential that occurs post-2030, and approaches a net source by about 2070 (Figure 4.2; 4.3By contrast, in mid - to high latitudes on all continents, substantial shifts in forest structure toward more rain - green, summer - green or deciduous rather than evergreen forest, and forest and woodland decline, underlie the overall drop in global terrestrial carbon sequestration potential that occurs post-2030, and approaches a net source by about 2070 (Figure 4.2; 4.3by about 2070 (Figure 4.2; 4.3).

Unlike other terrestrial and marine sources, which gradually release methane as it forms, the shelf is emitting methane that has accumulated in seabed deposits for hundreds of thousands of years and until now was restricted by permafrost, says Shakhova.