Search results for "seasonal"

Climats tropicaux d'aujourd'hui à demain : variabilité et changements

2008

Present and future tropical climates : their climate variability and their climate changes The oriffttality of tropical climates is re-examined under the light of climate variability and climate change, both present and future . The interannual variability of rainfall is on average larger in the tropics than in the extra-tropics, but it is also spatially more contrasted. Human communities have often responded to this constraint through efficient coping strategies. The regions showing the most variable climate do not necessarily have lower population densities, an indication that in the long run variability is not decisive. However, the recent demographic growth of these regions is often low…

Étude climatique de la mousson vietnamienne et applications à la prévision saisonnière

2008

This thesis aims at documenting the physical and dynamic processes associated with the monsoon circulation of Vietnamese regional and synoptic scales, to explore the predictability of its key components and develop statistical and dynamical methods for forecasting the monsoon onset and seasonal. It is divided into two parts. The first part is, in fact, a climate study based on analysis of diagnostic data: - first, the monthly rainfall and temperature data station over the period 1960-2000 are used to analyze the cycle and the variability of these fields on the seven traditional climatic regions of Vietnam using the observed precipitation in various stations. Classifications and correlations…

Dynamics of carbohydrate storage in trees

2019

Endotyping allergic rhinitis in children: A machine learning approach.

2021

Introduction: The diversity of allergic rhinitis (AR) phenotypes is particularly evident in childhood, suggesting the need to analyze and identify new approaches to capture such clinical heterogeneity. Nasal cytology (NC) is a very useful diagnostic tool for identifying and quantifying nasal inflammation. Data-driven approaches such as latent class analysis (LCA) assign subjects to classes based on their characteristics. We hypothesized that LCA based on NC, including the assessment of neutrophils, eosinophils, and mast cells, may be helpful for identifying AR endotypes in children. Methods: A total of 168 children were enrolled. Sociodemographic characteristics and detailed medical history…

L'Oscillation de Madden-Julian et la variabilité pluviométrique régionale en Afrique Subsaharienne

2007

The role of the Madden-Julian Oscillation ("MJO") on rainfall variability in Sub-Saharan Africa is examined, based on daily rain-gauge records and the NCEP-DOE AMIP-II reanalyses. The convective and dynamical signal associated with the MJO is extracted using two differing methodologies, the BMRC daily indices (Wheeler & Hendon 2004) on the one hand, and a Local Mode Analysis ("LMA", Goulet & Duvel 2000) on the other hand. The temporal variability of the MJO (in terms of period, amplitude, seasonality and location of the convective anomalies) is first analysed. Though the overall amplitude of the signal is not related to El Niño, the oscillations occurring under El Niño (La Niña) conditions …

Physical Activity Levels in Preschool Children During Winter and Summer

2019

Source at https://fysioterapeuten.no/Tidsskrifter. Bakgrunn: Studier nasjonalt og internasjonalt indikerer at barn i alderen tre til fem år ikke oppnår retningslinjene for anbefalingene (2014) om minimum 60 minutter med moderat til høy fysisk aktivitet (MVPA) per dag. Studiens hovedmål var å undersøke fysisk aktivitetsnivå hos barnehagebarn i tre barnehager i alderen tre til fem år i en periode om vinteren og en periode om våren/sommeren. Metode: Fysisk aktivitet ble målt i barnehagetiden fra mandag til onsdag med aktivitetsmåleren Actigraph GT3X. Aktivitetsnivået ble kategorisert ut fra antall akselerometer- tellinger/min, hvor hovedvariabelen var tid i moderat til høy fysisk aktivitet (MV…

Edaphyc characteristics and floristic composition of the seasonally dry forest la menta and timbes, Piura Region, Peru

2011

Con el objetivo de contribuir al conocimiento de los ecosistemas naturales del país, se determinó las características edáficas y la composición florística del bosque estacionalmente seco (La Menta, 04º 43' 55" LS y 80º 04' 55" LO, provincia de Piura y Timbes, 04º 44' 58" LS y 80º 03' 33" LO, provincia de Ayabaca), ambos en la región Piura, Perú. El área de estudio abarcó una extensión aproximada de 6 000 hectáreas en un rango altitudinal entre 350 m a 1 350 m. En cada bosque se muestrearon 5 transectos de 10 x 50 m a intervalos de 20 m, sumando un total de 2 500 m². El análisis de suelo reveló niveles bajos de materia orgánica, nitrógeno y potasio y medios de fósforo asimilable. Estos suelo…

Gulf of Maine shells reveal changes in seawater temperature seasonality during the Medieval Climate Anomaly and the Little Ice Age

2011

article i nfo In this study, we use subannually resolved oxygen isotope values of fossil (dead-collected) and modern (live- caught) bivalve shells (Arctica islandica L.) from the northwestern Atlantic (Gulf of Maine, USA) to reconstruct past seasonal changes in seawater temperature. Our results indicate decreased seasonal temperature amplitude of about 1.6 °C (or ∼21%) during Medieval times (ca. AD 1033-1062) compared to shells from the early Little Ice Age (ca. AD 1321-1391) and during the late 19th century (AD 1864-1886). Additionally, seasonal oxygen isotope data suggest that summers were cooler and winters were warmer in the Gulf of Maine during the 11th century compared to summers and …

Mate fidelity and coloniality in waterbirds: a comparative analysis

1998

Increased opportunities for information are one potential benefit of sociality. We apply this idea to the advantages of colonial breeding in bird species that are typically monogamous within a breeding season but often form new pair-bonds in subsequent seasons. Individuals may benefit from nesting in colonies at high density by identifying good-quality potential alternative mates among their neighbours. The opportunities for finding a better mating option are likely to increase with colony size and density. We tested this prediction with a comparative analysis of the association between mate fidelity and coloniality in waterbirds (wading birds and seabirds), where there is wide variation in…

Myxosporea parasites in roach, Rutilus rutilus (Linnaeus), from four lakes in central Finland

1991

Ten myxosporean species belonging to three families were found in roach, Rutilus rutilus (Linnaeus), obtained in 1985 and 1986 from four lakes in central Finland which are connected to each other, but differ in water quality. One of the lakes is polluted by paper and pulp mill effluent, two are eutrophic and one is oligotrophic and still in its natural state. Eight species were found in all the lakes. The most common species were Myxidium rhodei Leger, 1905, Myxobolus muelleri Butschli, 1882 and Myxobolus pseudodispar Gorbunova, 1936 with prevalences varying between 66–80, 16–31 and 32–59%, respectively, in the four lakes. The largest difference in myxosporean prevalence between lakes was f…