نتایج جستجو برای: s hypoleuca
تعداد نتایج: 711282 فیلتر نتایج به سال:
Birds have been used as bioindicators of pollution, such as toxic metals. Levels of pollutants in eggs are especially interesting, as developing birds are more sensitive to detrimental effects of pollutants than adults. Only very few studies have monitored intraspecific, large-scale variation in metal pollution across a species' breeding range. We studied large-scale geographic variation in met...
ABSTRACT The star compass of birds, like the sun compass, is not innate. To possess either them, birds have to observe rotating sky and determine its centre rotation (in case compass) or sun's movement (for compass). Young are believed learn how use before their first migration, even though evidence this lacking. Here, we tested whether hand-raised Pied flycatchers (Ficedula hypoleuca) that had...
Salvia hypoleuca یکی از انواع گونه های بومی و متعلق به خانواده لابیاته است.سرشاخه گلدار این گونه معطر در اواخر خرداد از منطقه فشم- گرمابدر استان تهران جمع آوری و به روش تقطیر با بخار آب (steam distillation) اسانس گیری شد (R=0.05%) ، سپس با دستگاه گازکروماتوگراف تؤام شده با طیف سنج جرمی مورد تجزیه و شناسایی قرار گرفت. از میان 22 ترکیب شناسایی شده بتا-کاریوفیلین (45%) ، بتا- پی نن(11%) ،جرماکرن-D...
[1] The effect of the Madden-Julian Oscillation (MJO) on the Northern Hemisphere wintertime stratospheric polar vortex and major, mid-winter stratospheric sudden warmings (SSWs) is evaluated using a meteorological reanalysis dataset. The MJO influences the region in the tropospheric North Pacific sector that is most strongly associated with a SSW. Consistent with this, SSWs in the reanalysis re...
Dynamical understanding of the Madden-Julian Oscillation (MJO) has been elusive, and predictive capabilities therefore limited. New measurements of the ocean's response to the intense surface winds and cooling by two successive MJO pulses, separated by several weeks, show persistent ocean currents and subsurface mixing after pulse passage, thereby reducing ocean heat energy available for later ...
The behavior of convection and the Madden–Julian oscillation (MJO) is compared in two simulations from the same global climate model but with two very different treatments of convection: one has a conventional parameterization of moist processes and the other replaces the parameterization with a two-dimensional cloud-resolving model, the so-called superparameterization. The different behavior o...
Antarctica is one of the regions where the earth’s surface is warming most rapidly. The interdecadal warming trend over much of Antarctica during the austral winter is about 1 ◦C decade−1, which is almost twice that of the global mean. There is increasing observational and modeling evidence that high-latitude warming is linked to localized heating in the tropics. Here we show that interdecadal ...
The effect of clouds on climate remains the largest uncertainty in climate change predictions, due to the inability of global climate models (GCMs) to resolve essential small-scale cloud and convection processes. We compare preindustrial and quadrupled CO2 simulations between a conventional GCM in which convection is parameterized and a "superparameterized" model in which convection is explicit...
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