نتایج جستجو برای: hemisphere surface
تعداد نتایج: 656590 فیلتر نتایج به سال:
Holocene variations of tropical moisture balance have been ascribed to orbitally forced changes in solar insolation. If this model is correct, millennial-scale climate evolution should be antiphased between the northern and southern hemispheres, producing humid intervals in one hemisphere matched to aridity in the other. Here we show that Holocene climate trends were largely synchronous and in ...
[1] Observational analysis and model experiments show that the sea surface temperature anomaly associated with the Indian Ocean Basin mode (IOBM), which persists from spring to summer, can generate significant circumglobal teleconnection (CGT) in the Northern Hemisphere summer midlatitude atmosphere. A warm IOBM can induce a new atmospheric heating source in the south Asia through a positive fe...
Experimental Cerebral Infarction. II. Clinicopathological Model of Deep Cerebral Infarction • Injection of silicone rubber cylinders into the internal carotid system permits selective occlusion of the proximal middle cerebral artery segment in the dog. Occlusions of this segment obstruct the mouths of the lenticulostriate arteries and result in deep cerebral hemisphere infarctions. Surface vess...
[1] The sensitivity of the tropospheric extratropical circulation to thermal perturbations of the polar stratosphere is examined in a dry primitive equation general circulationmodel with zonally symmetric forcing and boundary conditions. For sufficiently strong cooling of the polar winter stratosphere, the winter-hemisphere tropospheric jet shifts polewards and strengthens markedly at the surfa...
Observed atmospheric concentrations of CO(2) and data on the partial pressures of CO(2) in surface ocean waters are combined to identify globally significant sources and sinks of CO(2). The atmospheric data are compared with boundary layer concentrations calculated with the transport fields generated by a general circulation model (GCM) for specified source-sink distributions. In the model the ...
Eighteen profiles of ∼N-S-trending topography from the Mars Orbiter Laser Altimeter (MOLA) are used to analyze the shape of Mars’ northern hemisphere. MOLA observations show smaller northern hemisphere flattening than previously thought. The hypsometric distribution is narrowly peaked with > 20% of the surface lying within 200 m of the mean elevation. Low elevation correlates with low surface r...
We present the results of an initial effort to statistically map the fluxes of planetary ions on a closed surface around Mars. Choosing a spherical shell ~1000 km above the planet, we map both outgoing and incoming ion fluxes (with energies >25 eV) over a 4month period. The results show net escape of planetary ions behind Mars and strong fluxes of escaping ions from the northern hemisphere with...
obtain a uniform di stribution of peri aps i s longitudes over the surface of Mars, and both Sand Xband data were used where possible to elimi nate charged part i c l e effects. I nc lu sion of-the Vik ing data arcs altered the Mart i an geoid features, as defined by previous short-arc analysis techniques of Mariner 9 data, by about 80 meters in the Southern Hemisphere 1 and about 140 meters i ...
[1] Observations of the column-averaged dry molar mixing ratio of CO2 above both Park Falls, Wisconsin and Kitt Peak, Arizona, together with partial columns derived from aircraft profiles over Eurasia and North America are used to estimate the seasonal integral of net ecosystem exchange (NEE) between the atmosphere and the terrestrial biosphere in the Northern Hemisphere. We find that NEE is 25...
The problem of the closest packing of N equal nonoverlapping circles on a sphere has been of interest in geometry, chemistry, biology, engineering and optimization. The problem of packing N equal nonoverlapping circles on a hemisphere is a different problem of the same type and is also of interest in various fields such as detecting signals in a multisource neighbourhood and measuring solar rad...
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