نتایج جستجو برای: atmospheric indices

تعداد نتایج: 159612  

2009
STEFAN BRÖNNIMANN

We present an analysis of the large-scale atmospheric circulation variability since 1900 based on various circulation indices. They represent the main features of the zonal mean circulation in the northern hemisphere in boreal winter (such as the Hadley circulation, the subtropical jet, and the polar vortex in the lower stratosphere) as well as aspects of the regional and large-scale circulatio...

ژورنال: مرتع و آبخیزداری 2012

Assessment process of vegetation cover by remote-sensing images should be based on understanding of the vegetation indices. Vegetation indices are widely used for assessing and monitoring ecological variables such as vegetation cover, above-ground biomass and leaf area index. The aim of the present research was to study of the ASTER data capabilities to estimate the vegetation cover percentage ...

2003
Xiangming Xiao Bobby Braswell Qingyuan Zhang Stephen Boles Stephen Frolking Berrien Moore

Satellite observations play an important role in characterization of the interannual variation of vegetation. Here, we report anomalies of two vegetation indices for Northern Asia (40jN–75jN, and 45jE–179jE), using images from the SPOT-4 VEGETATION (VGT) sensor over the period of April 1, 1998 to November 20, 2001. The Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index ...

1998
Gerard Kiely John D Albertson Richard W Katz

The relationship between precipitation and large-scale measures of atmospheric circulation has received much attention in recent years (e.g. Bardossy & Caspary, 1990; Bardossy & Plate, 1992; Hughes et al., 1993; Woolhiser et al., 1993; Katz & Parlange, 1993). Some of the interest relates to quantifying the possible change in atmospheric circulation within the past two decades, with associated c...

2013
Yury Gurfinkel Tamara Breus Tatyana Zenchenko Vadim Ozheredov

Aim of this paper is to reveal whether the geomagnetic activity (GMA) and meteorological factors (MFs) affect vascular parameters of healthy volunteers. As a trial study we used new device “Tonocard,” and new vascular parameters for study—a pulse wave velocity (PWV) and an endothelial function (EnF) in addition to blood pressure measurements. These parameters never investigated before in such a...

Journal: :Earth’s Future 2021

Abstract Improved understanding of how our coasts will evolve over a range time scales (years‐decades) is critical for effective and sustainable management coastal infrastructure. A robust knowledge the spatial, directional temporal variability inshore wave climate required to predict future evolution hence vulnerability. However, has received little attention, an improved could drive developme...

Journal: : 2022

The paper studies the possibilities of using modern approaches to forecasting summer precipitation different intensity such as numerical modeling with WRF model and use atmospheric instability indices (CAPE, CIN, LI) calculated based on outputs for territory Urals. were determined both at location weather station (at nearest grid node) by calculating maximum average values in buffer zone a radi...

2008
Oli G. B. Sveinsson Jocelyn Gaudet Yochanan Kushnir Vincent Fortin

Results from diagnostic analyses to understand the seasonal evolution of the large-scale climatic state responsible for the development and melt of the winter snowpack, and spring–early summer precipitation in the Churchill Falls region on the QuébecLabrador Peninsula, Canada, are presented in the context of the development of an empirical model for seasonal to annual streamflow forecasting, wi...

2004
T. Morel G. Micela F. Favata D. Katz

We report the determination from high-resolution spectra of the atmospheric parameters and abundances of 13 chemical species (among which lithium) in 8 single-lined active binaries. These data are combined with our previous results for 6 other RS CVn systems to examine a possible relationship between the photospheric abundance patterns and the stellar activity level. The stars analyzed are gene...

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