Sentences with phrase «dust deposition in»

Subsequently, the underlying trend towards increasing brain size in Homo is most strongly correlated with both decreases in lake presence and high levels of dust deposition in the Mediterranean ODP967 record (Table 3), indicating drier conditions in East Africa [43].

Here we show that the presence of these lakes is associated with low levels of dust deposition in both West African and Mediterranean records, but is not associated with long - term global cooling and aridification of East Africa.

Schultz says the streaks could prove useful in establishing rates of erosion and dust deposition in areas where the streaks are found.

Not exact matches

The results showed no significant change in the quantity of black carbon deposited for the past 60 years or the quantity and mineralogical makeup of dust compared to the last 12,000 years, meaning that deposition of these light absorbing impurities is not a primary cause of reflectivity reduction or surface melting in the dry snow zone.

Glaser et al. show that dust deposition mediated by frequent tropical storms was an important source of nutrients for the Everglades until about 2800 years ago, when a climatic shift in the tropical Atlantic and Gulf of Mexico led to weather patterns that sharply decreased the level of dust inputs and led to a drier climate and a gradual loss of soil phosphorus, carbon, and nitrogen.

It can attach to dust particles and rain out of the sky, in a process called atmospheric deposition.

A peat bog in Romania provides a new insight into our knowledge of when the Sahara began to transform from grassland into the desert we know today, and the impact this had on dust deposition within Eastern Europe.

«Some of the observed features included ancient river beds, craters, massive extinct volcanoes, canyons, layered polar deposits, evidence of wind - driven deposition and erosion of sediments, weather fronts, ice clouds, localized dust storms, morning fogs and more,» NASA wrote in a summary of the mission.

I guess I am surprised that with better understanding of the importance of water vapor feedback, sulfate aerosols, black carbon aerosols, more rapid than expected declines in sea ice and attendant decreases in albedo, effects of the deposition of soot and dust on snow and ice decreasing albedo, and a recognition of the importance of GHGs that were probably not considered 30 years ago, that the sensitivity has changed so little over time.

Possible mechanisms include (iv) fertilization of phytoplankton growth in the Southern Ocean by increased deposition of iron - containing dust from the atmosphere after being carried by winds from colder, drier continental areas, and a subsequent redistribution of limiting nutrients; (v) an increase in the whole ocean nutrient content (e.g., through input of material exposed on shelves or nitrogen fixation); and (vi) an increase in the ratio between carbon and other nutrients assimilated in organic material, resulting in a higher carbon export per unit of limiting nutrient exported.

I guess I am surprised that with better understanding of the importance of water vapor feedback, sulfate aerosols, black carbon aerosols, more rapid than expected declines in sea ice and attendant decreases in albedo, effects of the deposition of soot and dust on snow and ice decreasing albedo, and a recognition of the importance of GHGs that were probably not considered 30 years ago, that the sensitivity has changed so little over time.

In the Ross Sea, bioavailable iron enters the area through snow melt and dust deposition.

«Recently, the deposition rates have been boosted by the resuspension of radionuclides in deposited particles, the 239,240 Pu content of which may originate from dusts from the East Asian continent deserts and arid areas.

For the current climate, we calculate the reduction in wet deposition by dust radiative forcing and find that the aerosol burden is increased only modestly.

But changes in dust deposition are not the primary culprit.

This Aeolian dust contains 3 — 5 % iron and its deposition has fallen nearly 25 % in recent decades.

However, studies of sediment cores have shown that natural dust deposition has been in decline.

The decline in dust deposition means the plankton has fewer nutrients to grow and thrive.

In a separate talk today, glaciologist Lonnie Thompson showed a new ice core data * from Huascarán in Peru, the highest tropical mountain, with a huge spike in dust deposition around this timIn a separate talk today, glaciologist Lonnie Thompson showed a new ice core data * from Huascarán in Peru, the highest tropical mountain, with a huge spike in dust deposition around this timin Peru, the highest tropical mountain, with a huge spike in dust deposition around this timin dust deposition around this time.

They showed the evidence to 77 domain experts (i.e., atmospheric chemists with expertise in condensation trails, and geochemists working on atmospheric deposition of dust and pollution), and asked about each of the claims made by «SLAP theorists.»

To help minimize potential issues with time scale mismatches, data uncertainty, and uneven data distribution across temperature ranges, we collected the dust deposition data points for each data set combination in Fig. 3 into four bins.

Scatter plots of dust deposition flux versus temperature for SH and NH records plotted in Fig. 2.

We use the above dust deposition − temperature relationships to derive climate dependencies of dust radiative and iron fertilization forcing under the assumption that both forcings vary in proportion to the dust deposition, and can therefore be expressed in the same form as Eq.

The dust − temperature relationships for the Southern Ocean and Chinese Loess are shown in Fig. 3 B and C. To further minimize possible issues connected with time scales, data uncertainty, and uneven data distribution across temperature ranges, we collect the dust deposition − temperature data points for each data set combination in Fig. 3 into four bins (see Materials and Methods).

Glacial / interglacial changes in mineral dust and sea - salt records in polar ice cores: Sources, transport, and deposition

Deposition of mineral dust plays an important role in the biogeochemical cycle of the oceans, by providing the nutrient iron, which affects ocean biogeochemistry with feedbacks to climate and dust production (Jickells et al., 2005; Section 7.3.4.4).

The blue points in B are LGM / HOL ratios for the individual dust deposition time series considered in Fig. 2.

2) That Planktos will be mitigating that shortfall by replenishing marine iron micronutrients in concentrations similar to dust storm deposition is also a fact.

In a 2010 study researcher, scientists found that in heavy dust years, the Colorado River's flow on average peaked three weeks earlier than in years without heavy dust depositioIn a 2010 study researcher, scientists found that in heavy dust years, the Colorado River's flow on average peaked three weeks earlier than in years without heavy dust depositioin heavy dust years, the Colorado River's flow on average peaked three weeks earlier than in years without heavy dust depositioin years without heavy dust deposition.

Because of their large spatial coverage, satellite data have proven useful in evaluating dust sources, transport and deposition in global models.

The recent demonstration that an inadequate supply of iron limits primary production in this region supports earlier speculation that, in the past, fluctuations in the atmospheric deposition of iron - bearing dust may have driven large changes in productivity.