The EURONEAR Lightcurve Survey of Near Earth Asteroids 2017–2020     

Vaduvescu  O.  Aznar Macias  A.  Wilson  T. G.  Zegmott  T.  Pérez Toledo  F. M.  Predatu  M.  Gherase  R.  Pinter  V.  Pozo Nunez  F.  Ulaczyk  K.  Soszyński  I.  Mróz  P.  Wrona  M.  Iwanek  P.  Szymanski  M.  Udalski  A.  Char  F.  Salas Olave  H.  Aravena-Rojas  G.  Vergara  A. C.  Saez  C.  Unda-Sanzana  E.  Alcalde  B.  de Burgos  A.  Nespral  D.  Galera-Rosillo  R.  Amos  N. J.  Hibbert  J.  López-Comazzi  A.  Oey  J.  Serra-Ricart  M.  Licandro  J.  Popescu  M. 《Earth, Moon, and Planets》2022,126(2):1-26

Earth, Moon, and Planets - The Perseverance rover (Mars 2020) mission, the first step in NASA’s Mars Sample Return (MSR) program, will select samples for caching based on their potential to...  相似文献   

On the role of domain size and resolution in the simulations with the HIRHAM region climate model     

Morten A. D. Larsen  Peter Thejll  Jens H. Christensen  Jens C. Refsgaard  Karsten H. Jensen 《Climate Dynamics》2013,40(11-12):2903-2918

We investigate the simulated temperature and precipitation of the HIRHAM regional climate model using systematic variations in domain size, resolution and detailed location in a total of eight simulations. HIRHAM was forced by ERA-Interim boundary data and the simulations focused on higher resolutions in the range of 5.5–12 km. HIRHAM outputs of seasonal precipitation and temperature were assessed by calculating distributed model errors against a higher resolution data set covering Denmark and a 0.25° resolution data set covering Europe. Furthermore the simulations were statistically tested against the Danish data set using bootstrap statistics. The results from the distributed validation of precipitation showed lower errors for the winter (DJF) season compared to the spring (MAM), fall (SON) and, in particular, summer (JJA) seasons for both validation data sets. For temperature, the pattern was in the opposite direction, with the lowest errors occurring for the JJA season. These seasonal patterns between precipitation and temperature are seen in the bootstrap analysis. It also showed that using a 4,000 × 2,800 km simulation with an 11 km resolution produced the highest significance levels. Also, the temperature errors were more highly significant than precipitation. In similarly sized domains, 12 of 16 combinations of variables, observation validation data and seasons showed better results for the highest resolution domain, but generally the most significant improvements were seen when varying the domain size.  相似文献   

Progress towards single-grain optical dating of fossil mud-wasp nests and associated rock art in northern Australia     

《Quaternary Science Reviews》2003,22(10-13):1273-1278

Here we report on investigations into optical dating of fossil mud-wasp nests as a means of constraining the ages of overlying and underlying rock paintings in northern Australia. We describe the application of a ‘dual-signal’ regenerative-dose approach, using the easy-to-bleach (‘fast’) and hard-to-bleach (‘slow’) components of optically stimulated luminescence (OSL) emitted by individual sand-sized grains of quartz extracted from two nests: a modern nest (<2 yr old) and a nest dated by ¹⁴C to about 30,000 calendar years (∼30 ka). For the modern nest, most of the palaeodoses obtained from both the fast and slow components are consistent with a zero age, while the ¹⁴C-dated nest yielded an age of 27.1±1.5 ka from those grains that yielded concordant palaeodoses from the fast and slow components (as measured by linearly modulated OSL). Our findings indicate that a dual-signal approach permits grains that were fully bleached by sunlight at the time of nest construction, and that have since remained concealed in the light-safe ‘core’ of a nest, to be distinguished from (a) grains that were incompletely bleached before nest construction, and (b) grains embedded in the continuously light-exposed, exterior portion of a nest. We conclude that reliable optical ages for small mud-wasp nests associated with ancient rock art may be obtained using the dual-signal approach and the light-safe grains.  相似文献   

Degradation of carbon tetrachloride in a reducing groundwater environment: implications for natural attenuation     

《Applied Geochemistry》2003,18(4):503-525

Several laboratory experiments have demonstrated degradation of carbon tetrachloride (CT) in groundwater, but there appear to have been no corroborating long-term field studies. Investigations conducted in 1989 and 1999 at an industrial site constructed on an infilled estuarine environment in France provide data over a decade for which CT degradation could be evaluated. A Dense Non-Aqueous Phase Liquid (DNAPL) containing oil and >90% CT that was present in 1989 was absent in the extremely reducing site groundwater in both 1999 and 2000 (average Eh=−170 mV at pH 7, sulfide up to 21 mg l⁻¹, and Fe⁺² up to 3.2 mg l⁻¹). These conditions facilitated dechlorination of CT to chloroform (CF) present at up to 46 mg l⁻¹, and methylene chloride (up to 75 mg l⁻¹). Carbon disulfide (CS₂), a terminal degradation product in reducing environments in laboratory experiments, was present at a mass ratio averaging 2.4:1 CF:CS₂, indicative of abiotic degradation. The lack of detection of the separate phase CT, the ratio of CF:CS₂, the presence of low molecular weight organic acids (i.e., acetate ∼900 mg l⁻¹; citrate 360 mg l⁻¹; and propionate, up to 111 mg l⁻¹) and pyrite in conjunction with excess inorganic Cl in groundwater are all indicators of ongoing degradation of the chlorinated compounds. However, while natural attenuation of chloromethanes may be a viable adjunct to strategies designed to remediate CT in reducing groundwater, its efficacy is hard to quantify in complex field environments where upgradient sources are still present.  相似文献   

The 22nd Conference of the Baltic Oceanographers, 25–29 November 2001     

《Journal of Sea Research》2003,49(4):227-228

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Hold tight at The Hague     

《Climate Policy》2001,1(1):3-4

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Welcome to Climate Policy     

《Climate Policy》2001,1(1):1-2

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3.9 Aral Sea Basin: Rapporteur: Frits Verhoog. Participants: over 100     

《Water Policy》2001

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Geochronological constraints on Paleoproterozoic crustal evolution and regional correlations of the northern Outer Hebridean Lewisian complex,Scotland     

《Precambrian Research》2001,105(2-4):227-245

Ion-microprobe U–Th–Pb geochronological data are presented for four samples from Paleoproterozoic belts in the Lewisian of the northern Outer Hebrides, north-west Scotland. Two of these samples, a tonalite sheet associated with the South Harris igneous complex, and a psammite from the Leverburgh metasupracrustal belt, South Harris, yield zircons with a dominant ca. 1.87 Ga age. These are interpreted as the igneous crystallisation age for the tonalite and the source rock for the psammite, and their age concordance suggests that the latter was developed in an arc basin sequence, derived largely from contemporaneous igneous rocks, and buried during collision, which resulted in documented >1.83 Ga high-grade metamorphism. A diorite from the Paleoproterozoic shear zone at the northern tip of Lewis has a probable 2.7–2.8 Ga protolith age, although its zircons have strongly been affected by Pb-loss during later events culminating in development of low Th/U overgrowths at ca. 1.86 Ga. Zircons from a tonalite from Berneray in the Sound of Harris yield an Archean crystallisation age of ca. 2.83 Ga, with no indication of later disturbance, thus providing a southern limit to the region affected by Paleoproterozoic tectonothermal events. The Paleoproterozoic arc in South Harris represents a major tectonic boundary (active margin) in the Lewisian of the Outer Hebrides, possibly correlated with the Laxford or Gairloch shear zones of the mainland Lewisian. Contrasts in the flanking region geology and geochronology, possibly reflecting lateral heterogeneities, may be introduced by major thrusts and/or extensional faults (e.g. the Outer Isles fault) developed between the shear zones. On a broader regional scale, evidence for a magmatic arc in the Lewisian is consistent with the tectonic style of other ca. 1.9 Ga Paleoproterozoic collisional orogens throughout Laurentia–Fennoscandia, suggesting a reappraisal of the formerly proposed intracratonic evolution of the Lewisian at this time.  相似文献   

The petrogenesis of the Kangâmiut dyke swarm,W. Greenland     

《Precambrian Research》2001,105(2-4):183-203

Previous studies have shown that the 2.04 Ga Kangâmiut dyke swarm of SW Greenland was injected into an active tectonic environment associated with the formation of the Nagssugtoqidian orogenic belt. Major and trace element modelling of the swarm shows that its chemical evolution was controlled by simple clinopyroxene–plagioclase fractionation. However, such trends — although typical of continental flood basalts and mafic dyke swarms — are at variance with their mineralogy and petrography, which show that locally hornblende is the dominant primary ferromagnesian mineral. Modelling of intradyke fractionation alone shows that hornblende could locally have been an important crystallising phase within several dykes. Normal basaltic fractionation must have occurred before dyke injection at the exposed crustal levels, where the influx of water into the dykes is believed to be responsible for the transition from clinopyroxene–plagioclase (tholeiitic) to hornblende–plagioclase±oxides (calc–alkaline) crystallisation. Overall geochemical trends are dominated by tholeiitic fractionation because (1) hornblende fractionation tended to buffer chemical composition; (2) the presence of water in the surrounding country rocks may have resulted in the advection of heat away from the dyke and consequently resulted in rapid crystallisation, particularly in thin dykes. There is no evidence from trace element data, and particularly Pb isotopic ratios, of any significant assimilation of country rocks occurring during clinopyroxene–plagioclase fractionation, although this does not preclude contamination of the mantle source prior to magma generation. It is likely that the incompatible element enrichment within the dykes resulted from subduction-related mantle metasomatism. The Kangâmiut dyke swarm was both a syn-tectonic and thermal event, which triggered it may be linked to passage of a slab window underneath the metasomatised region, or a mantle plume ascending under a subduction zone.  相似文献