Share on FacebookShare on TwitterShare on LinkedinShare via Email Share via Shortlink Message* hamptons-weeklyLuxury ListingsResidential Real EstateThe Hamptons David Walentas and 199 Coopers Neck Lane (Getty, Tim Davis)What started as a weekend project turned into a more extensive undertaking for Two Trees Management founder David Walentas.The developer, who built up much of Brooklyn’s Dumbo neighborhood, recently listed a Southampton estate for $35 million after two years of renovations, the Wall Street Journal reported.Walentas bought the century-old home with his late wife Jane in 2019 for $11.6 million, intending to fix the place up and sell it once renovations were complete. After his son Jed took over day-to-day operations at Two Trees, David Walentas used the extra time to work on the 17,000-square-foot property.Read moreFirst Hamptons passive house on market asks $4.5M Buyers hunt Hamptons, North Fork homes — often in vain Luba Marks’ Southampton home, asking $37M, in contract Email Address* Full Name* Tags Share via Shortlink Some highlights of the renovations include higher ceilings, larger windows and a four-car garage. Walentas also added a pool house, solarium and greenhouse, per the report.“This is a brand new house in an old shell,” Walentas told the publication.The renovations have taken roughly two years and are set to be completed in the summertime. The cost for all the changes are about $10 million, the publication reported.Christopher Burnside of Brown Harris Stevens is the listing agent.[WSJ] — Cordilia JamesContact Cordilia James
Citifluor, a photofading retardant for epifluorescence studies, was evaluated as a mountant for enhancing algal autofluorescence and Acridine Orange (AO) fluorescence of bacteria and fungi in mineral soils from Antarctic fellfields. It accentuated the colour contrast between red-fluorescing eukaryotic algae, gold-fluorescing cyanobacteria, and green-fluorescing AO-stained bacteria. Photofading was retarded for up to an hour. The technique was applied successfully to microbial enumeration of soil smears, direct examination of intact soil microbial crusts and carborundum paper colonized by meltwater microbes in the field, and for the observation of aerobiological strips from Rotorod samplers. Whilst extending the scope of algal autofluorescence studies, Citifluor made AO technically and economically preferable to FITC, and gave similar bacterial counts.
1 The carbon and nitrogen dynamics in a maritime Antarctic lake outflow stream were investigated. The stream and the algal communities could be split into two zones: a semi-aquatic margin consisting of a perennial cyanobacteria/diatom mat and a flowing channel with a similar perennial mat that was overgrown by annual filamentous chlorophytes during the course of the summer.2 Neither algal community was limited by nutrient availability. Major nutrients were always available in the stream water. There were slight differences in the atomic ratios of the mats, the N:P ratios in the channel mat being lower than those in the marginal mat. However, both these and the total dissolved N:P ratio in the stream water were all close to those that indicate a balanced supply.3 There was no net carbon or nitrogen accumulation by the marginal mat suggesting that uptake processes were balanced by loss processes.4 Maximum rates of carbon fixation (0.1–0.5mgCg−1 dry weight h−1) were similar to those of other perennial Antarctic algal mats. Productivity appeared to be limited by physical factors, but the effects of irradiance and temperature could not be separated.5 There were no heterocystous cyanobacteria in the mat communities and rates of atmospheric nitrogen fixation were very low (0–10ngNmg−1 mat Nh−1). Fixation accounted for only 0.3% of the nitrogen accumulation of the channel mats, but was higher in the marginal mat where uptake of other sources of nitrogen was also low.6 Nitrogen accumulation by the channel mat averaged 0.34gNm−2 day−1. Only 0.05gNm−2 day−1 was accounted for by the uptake of dissolved inorganic nitrogen (nitrate plus ammonium). The major (80%) source of nitrogen appeared to be dissolved organic nitrogen. Recycling of nitrogen within the stream ecosystem may also be important.
Surface snow samples have been analysed for the heavy metals Cd, Cu, Pb and Zn to investigate the spatial scale of local sources of pollution in Antarctica. Samples from around an isolated petrol generator showed vastly increased levels (up to 800,000 times background) directly under the exhaust. Concentrations fell sharply with distance from the exhaust, reaching background levels at 40 m, even in the downwind direction. Snow was also collected at various distances from a manned scientific station. The data are more difficult to interpret, but the influence of the station could not be detected beyond 10 km. These findings indicate the areas that are influenced by local emissions, and that are therefore unsuitable for air and snow sampling intended to study larger-scale pollution input.
The eastern Palmer Land shear zone: a new terrane accretion model for the Mesozoic development of the Antarctic Peninsula
A major ductile fault zone, the eastern Palmer Land shear zone, has been identified east of the spine of the southern Antarctic Peninsula. This shear zone separates newly identified geological domains, and indicates that during Late Jurassic terrane accretion and collision, two and possibly three separate terranes collided, resulting in the Palmer Land orogeny. The orogeny is best developed in eastern Palmer Land and eastern Ellsworth Land. There, shallow-marine sedimentary rocks of the Latady Formation, and a metamorphic and igneous basement complex of possible Lower Palaeozoic to pre-Early Jurassic age, are thrust and folded. This forms an arcuate, east-directed, foreland, fold and thrust belt up to 100 km wide and 750 km long, parallel to the axis of the Antarctic Peninsula. The newly identified Antarctic Peninsula domains include: (1) a parautochthonous Eastern Domain that represents part of the margin of the Gondwana continent, comparable to the Western Province of New Zealand, the Ross Province superterrane of Marie Byrd Land, the Eastern Series of south-central Chile, the Pampa de Agnía and Tepuel rocks of north Patagonia, and the Cordillera Darwin rocks of Tierra del Fuego, (2) a suspect Central Domain that represents an allochthonous, microcontinental, magmatic arc terrane, comparable to the Median Tectonic Zone of New Zealand, the Amundsen Province superterrane of Marie Byrd Land, and Coastal Cordillera of north Chile and (3) a suspect Western Domain, with strong similarities to the Eastern Province of New Zealand, Western Series of south-central Chile, and Chonos metamorphic complex of north Patagonia, that represents either a subduction–accretion complex to the Central Domain, or another separate crustal fragment. Although an allochthonous terrane hypothesis for the Antarctic Peninsula remains to be fully tested, this has much in common with models for the New Zealand and South American parts of the Pacific margin of Gondwana. The identification of a potential allochthonous terrane–continent collision zone allows us to define the edge of the Gondwana continent in the Antarctic Peninsula sector of the supercontinent margin, which has implications for Mesozoic reconstructions of Gondwana.
Diving marine predators have been used to collect data on ocean temperature, but salinity measurements have not previously been incorporated into predator-borne data loggers. Here we present data on initial calibration and field trials of a new conductivity, temperature and depth (CTD) data logger used alongside a satellite-positioning transmitter to provide three-dimensional oceanographic information. This provides CTD data analogous to that collected by a ship-deployed undulating oceanographic recorder. Calibration tests of these units showed a near-field effect caused by the proximity of material to the tag, but demonstrate that the resulting data offset can be removed by post hoc calibration. Field tests of the system were conducted on 16 female Antarctic fur seals (Arctocephalus gazella) at Bird Island, South Georgia. These results matched those found by standard ship-based survey techniques, but suggest temporal variability in the structure and location of the two water masses found to the north of South Georgia. Overall, this initial proof-of-concept work is encouraging; future refinement of this technique is likely to provide an additional data source for both oceanographers and biologists.
Cyanobacteria are the dominant phototrophs in Antarctic biota where they form conspicuous microbial mats at the bottom of lakes and ponds. In the frame of the OSTC project LAQUAN (EV/12/1B), a polyphasic approach was used to study their geographic distribution and the diversity of such communities. Molecular techniques based on rRNA sequences were used to study the saline Lake Rauer2, located in the Rauer Islands, a region of the Eastern Antarctic coast. A clone library was constructed on the sample of Lake Rauer2 and the 57 sequences obtained were grouped into 5 phylotypes.
U-Pb zircon ion-microprobe geochronology, whole rock geochemistry and feldspar Pb and Sm-Nd isotopic analyses carried out on granitoid rocks along a transect across the Nabitah fault zone suggest that it separates two juvenile oceanic arc terranes which differ in age and geochemical character. The Tathlith–Malahah terrane situated to the east of the fault zone comprises the Tathlith arc which developed through an older volcanic and sedimentary succession. Plutonic rocks associated with the Tathlith arc formed between c. 700–670 Ma and are younger than those from the 750–720 Ma Tarib arc within the Al Qarah terrane, situated to the west of the fault zone. Intrusions from both the Tarib and Tathlith arcs have positive ɛNd values and feldspar Pb signatures that are consistent with juvenile crustal additions. A tectonic model is presented for the evolution of the Nabitah fault zone: the Tathlith arc developed on and through the Tarib fore arc as a consequence of subduction roll back. Back arc spreading, promoted by collision of a continental mass to the south, created a separate Tathlith–Malahah terrane. Continued convergence of the continent inverted the back arc basin and counter-clockwise rotation formed the Nabitah fault zone. The fault zone does not represent a major suture zone between the western juvenile arc terranes and the more evolved eastern arc and continental terranes, as had previously been speculated.
Boundary-layer measurements from the Brunt Ice Shelf, Antarctica are analyzed to determine flux–profile relationships. Dimensionless quantities are derived in the standard approach from estimates of wind shear, potential temperature gradient, Richardson number, eddy diffusivities for momentum and heat, Prandtl number, mixing length and turbulent kinetic energy. Nieuwstadt local scaling theory for the stable atmospheric boundary-layer appears to work well departing only slightly from expressions found in mid-latitudes. An E E – lm l m single-column model of the stable boundary layer is implemented based on local scaling arguments. Simulations based on the first GEWEX Atmospheric Boundary-Layer Study case study are validated against ensemble-averaged profiles for various stability classes. A stability-dependent function of the dimensionless turbulent kinetic energy allows a better fit to the ensemble profiles.
Seasonal and temporal variations of field-aligned currents and ground magnetic deflections during substorms
Field‐aligned currents (FACs), also known as Birkeland currents, are the agents by which energy and momentum are transferred to the ionosphere from the magnetosphere and solar wind. This coupling is enhanced at substorm onset through the formation of the substorm current wedge. Using FAC data from the Active Magnetosphere and Planetary Electrodynamics Response Experiment and substorm expansion phase onsets identified using the Substorm Onsets and Phases from Indices of the Electrojet technique, we examine the Northern Hemisphere FACs in all local time sectors with respect to substorm onset and subdivided by season. Our results show that while there is a strong seasonal dependence on the underlying FACs, the increase in FACs following substorm onset only varies by 10% with season, with substorms increasing the hemispheric FACs by 420 kA on average. Over an hour prior to substorm onset, the dayside currents in the postnoon quadrant increase linearly, whereas the nightside currents show a linear increase starting 20–30 min before onset. After onset, the nightside Region 1, Region 2, and nonlocally closed currents and the SuperMAG AL (SML) index follow the Weimer (1994, https://doi.org/10.1029/93JA02721) model with the same time constants in each season. These results contrast earlier contradictory studies that indicate that substorms are either longer in the summer or decay faster in the summer. Our results imply that, on average, substorm FACs do not change with season but that their relative impact on the coupled magnetosphere‐ionosphere system does due to the changes in the underlying currents.