1,889 results match your criteria seasonal diurnal

The chronobiology of migraine: a systematic review.

J Headache Pain 2021 Jul 19;22(1):76. Epub 2021 Jul 19.

Danish Headache Center, Department of Neurology, Rigshospitalet Glostrup, Faculty of Health and Medical Sciences, University of Copenhagen, Valdemar Hansen Vej 5, DK-2600, Glostrup, Denmark.

Background: The paroxysmal nature of migraine is a hallmark of the disease. Some patients report increased attack frequency at certain seasons or towards the end of the week, while others experience diurnal variations of migraine attack onset. This systematic review investigates the chronobiology of migraine and its relation to the periodicity of attacks in existing literature to further understand the oscillating nature of migraine. Read More

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Long-term variation of boundary layer height and possible contribution factors: A global analysis.

Sci Total Environ 2021 Nov 10;796:148950. Epub 2021 Jul 10.

Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, Gansu, China.

Boundary layer height (BLH) plays an important role in regulating global weather/climate, as well as the dispersion and transportation of pollutants. Until now, however, the attribution and contributions of different controlling factors to BLH long-term variability and trends have not been quantified on a global scale. The long-term radiosonde dataset was used in this study to retrieve global BLH climatology; seasonal, diurnal, long-term variation and trends were analyzed over a 39-year period (1980-2018). Read More

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November 2021

How trees thrive in a dry climate: Diurnal and seasonal hydrology and water relations in a riparian cottonwood grove.

Tree Physiol 2021 Jul 14. Epub 2021 Jul 14.

Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge, Alberta T1K 3M4, Canada.

In semi-arid ecoregions trees are restricted to river valley floodplains where river water supplements the limited precipitation. To characterize the associated diurnal and seasonal dynamics in hydrology and water relations we studied narrowleaf cottonwoods (Populus angustifolia) along a prairie river in Canada. From June through August, the shallow soil moisture was depleted but moisture remained higher above the alluvial groundwater table, which dropped to 2. Read More

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The molecular clock gene cryptochrome 1 () and its role in cluster headache.

Cephalalgia 2021 Jul 13:3331024211024165. Epub 2021 Jul 13.

Department of Neuroscience, 27106Karolinska Institutet, Karolinska Institutet, Stockholm, Sweden.

Background: Cluster headache is a severe primary headache disorder commonly featuring a strikingly distinct circadian attack pattern. Therefore, the circadian system has been suggested to play a crucial role in the pathophysiology of cluster headache. Cryptochromes are key components of the molecular clock generating circadian rhythms and have previously been shown to be associated with several psychiatric disorders, including seasonal affective disorder, bipolar disorder, and depression. Read More

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Substantial shifts in flowering phenology of Sternbergia vernalis in the Himalaya: Supplementing decadal field records with historical and experimental evidences.

Sci Total Environ 2021 Nov 1;795:148811. Epub 2021 Jul 1.

Centre for Biodiversity & Taxonomy, Department of Botany, University of Kashmir, Srinagar 190 006, J&K, India. Electronic address:

In an age of anthropocene, shifting plant phenology is one of the most striking biological indicators of global environmental change. Majority of the studies reporting shifts in plant phenology are available from the North America and Europe and largely scarce from the developing world, including the Himalaya; and studies integrating multiple methodological approaches to investigate the climate-driven phenological shifts are too rare. Here, we report the shifts in spring flowering phenology of model plant species, Sternbergia vernalis in response to the changing climate in Kashmir Himalaya, by integrating decadal field observational records with long-term herbarium and dated-photograph data, and supported with experimental evidences. Read More

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November 2021

Enlightened: addressing circadian and seasonal changes in photoperiod in animal models of bipolar disorder.

Transl Psychiatry 2021 07 5;11(1):373. Epub 2021 Jul 5.

Department of Chemistry, Vanderbilt University, Nashville, TN, 37240, USA.

Bipolar disorders (BDs) exhibit high heritability and symptoms typically first occur during late adolescence or early adulthood. Affected individuals may experience alternating bouts of mania/hypomania and depression, with euthymic periods of varying lengths interspersed between these extremes of mood. Clinical research studies have consistently demonstrated that BD patients have disturbances in circadian and seasonal rhythms, even when they are free of symptoms. Read More

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Diurnal and seasonal molecular rhythms in the human brain and their relation to Alzheimer disease.

Andrew S P Lim

Handb Clin Neurol 2021 ;179:271-284

Division of Neurology, Department of Medicine, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON, Canada. Electronic address:

Diurnal and seasonal rhythms influence many aspects of human physiology including brain function. Moreover, altered diurnal and seasonal behavioral and physiological rhythms have been linked to Alzheimer's disease and related dementias (ADRD). Understanding the molecular basis for these links may lead to identification of novel targets to mitigate the negative impact of normal and abnormal diurnal and seasonal rhythms on ADRD or to alleviate the adverse consequences of ADRD on normal diurnal and seasonal rhythms. Read More

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Hydrologic gradient changes of soil respiration in typical steppes of Eurasia.

Sci Total Environ 2021 Nov 27;794:148684. Epub 2021 Jun 27.

State Key Laboratory of Fydroscience and Engineering, Department of Hydraulic Engineering Tsinghua University, Beijing 100084, China.

Soil respiration (R) is affected by many factors and shows significant diurnal and seasonal changes at different spatial and temporal scales. However, in a semi-arid steppe, the mechanism of the dynamic influence of environmental factors on R is not clear, and the effect of subtle changes of soil water on R under drought stress is yet to be explored. Therefore, Xilin River Basin, was the study area and a hydrological gradient on the four ecosystems for R and hydrometeorological monitoring was selected. Read More

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November 2021

Mass absorption cross-section and absorption enhancement from long term black and elemental carbon measurements: A rural background station in Central Europe.

Sci Total Environ 2021 Nov 16;794:148365. Epub 2021 Jun 16.

Global Change Research Institute of the CAS, Brno 603 00, Czech Republic; RECETOX, Masaryk University, Brno 625 00, Czech Republic.

Black carbon (BC) is a dominant aerosol light absorber, and its brown carbon (BrC) coating can enhance absorption and lead to uncertainties concerning the radiative forcing estimation. This study investigates the mass absorption cross-section of equivalent BC (MAC) during a long-term field measurement (2013-2017) at a rural Central European site. The MAC enhancement factor (E) and the contribution of BrC coatings to the absorption coefficient (B) were estimated by combining different approaches. Read More

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November 2021

Spatiotemporal patterns in the natural and anthropogenic additions to the soundscape in parts of the Salish Sea, British Columbia, 2018-2020.

Mar Pollut Bull 2021 Sep 24;170:112647. Epub 2021 Jun 24.

Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, British Columbia, V8L 4B2, Canada.

Passive acoustic recorders were deployed over two years (February 2018-March 2020) in the Salish Sea to monitor the underwater soundscape. Seasonal cycles and differences between the open Strait of Juan de Fuca and protected inner waterways were pervasive during this period. A comparison between natural and human-derived noise demonstrated the impact of anthropogenic activities on the sound field. Read More

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September 2021

Fathering behavior, attachment, and engagement in childcare predict testosterone and cortisol.

Dev Psychobiol 2021 Sep 26;63(6):e22149. Epub 2021 Jun 26.

University of Vienna, Vienna, Austria.

The present study examined testosterone (T) and cortisol (Cort) in fathers engaged with caregiving. We collected saliva samples in the mornings and evenings of two consecutive days in 150 fathers of 1- to 5-year-old children. Fathers completed questionnaires on socioeconomic status, family structure and life, sleep characteristics and body mass index (BMI), and reported on their engagement in childcare. Read More

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September 2021

Development of season-dependent land use regression models to estimate BC and PM exposure.

Sci Total Environ 2021 Nov 19;793:148540. Epub 2021 Jun 19.

School of Energy and Environmental Engineering, University of Science and Technology of Beijing, Beijing 100083, China. Electronic address:

Reliable estimation of exposure to black carbon (BC) and sub-micrometer particles (PM) within a city is challenging because of limited monitoring data as well as the lack of models suitable for assessing the intra-urban environment. In this study, to estimate exposure levels in the inner-city area, we developed land use regression (LUR) models for BC and PM based on specially designed mobile monitoring surveys conducted in 2019 and 2020 for three seasons. The daytime and nighttime LUR models were developed separately to capture additional details on the variation in pollutants. Read More

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November 2021

PERSIANN Dynamic Infrared-Rain Rate (PDIR-Now): A Near-Real-Time, Quasi-Global Satellite Precipitation Dataset.

J Hydrometeorol 2020 Dec 25;21(12):2893-2906. Epub 2020 Nov 25.

Center for Western Weather and Water Extremes, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California.

This study presents the Precipitation Estimation from Remotely Sensed Information Using Artificial Neural Networks-Dynamic Infrared Rain Rate (PDIR-Now) near-real-time precipitation dataset. This dataset provides hourly, quasi-global, infrared-based precipitation estimates at 0.04° × 0. Read More

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December 2020

Diurnal variation in serum concentrations of cortisol in captive African (Loxodonta africana) and Asian (Elephas maximus) elephants.

Zoo Biol 2021 Jun 20. Epub 2021 Jun 20.

William H. Darr College of Agriculture, Missouri State University, Springfield, Missouri, USA.

Cortisol is involved in a broad range of physiological processes and enables animals to adapt to new situations and challenges. Diurnal fluctuations in circulating cortisol concentrations in elephants have been demonstrated based on samples from urine and saliva. The aims of this study were to demonstrate diurnal cortisol fluctuations based on blood samples and compare concentrations between seasons, species, and changes in reproductive hormone concentrations. Read More

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On the phenology of protists: recurrent patterns reveal seasonal variation of protistan (Rhizaria: Cercozoa and Endomyxa) communities in tree canopies.

FEMS Microbiol Ecol 2021 06;97(7)

Institute of Zoology, Terrestrial Ecology, University of Cologne, Zülpicher Str. 47b, 50674 Köln, Germany.

Tree canopies are colonized by billions of highly specialized microorganisms that are well adapted to the highly variable microclimatic conditions, caused by diurnal fluctuations and seasonal changes. In this study, we investigated seasonality patterns of protists in the tree canopies of a temperate floodplain forest via high-throughput sequencing with group-specific primers for the phyla Cercozoa and Endomyxa. We observed consistent seasonality, and identified divergent spring and autumn taxa. Read More

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Diurnal and seasonal differences in cardiopulmonary response to exercise in morning and evening chronotypes.

Chronobiol Int 2021 Jun 15:1-12. Epub 2021 Jun 15.

Department of Physiology, Faculty of Science, Charles University, Prague, Czech Republic.

Circadian clocks regulate multiple physiological domains from molecular to behavioral levels and adjust bodily physiology to seasonal changes in day length. Circadian regulation of cellular bioenergy and immunity in the cardiovascular and muscle systems may underpin the individual diurnal differences in performance capacity during exercise. Several studies have shown diurnal differences in cardiopulmonary parameters at maximal and submaximal workloads in morning and evening circadian human phenotypes. Read More

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On the phenology of protists: recurrent patterns reveal seasonal variation of protistan (Rhizaria: Cercozoa and Endomyxa) communities in tree canopies.

FEMS Microbiol Ecol 2021 06;97(7)

Institute of Zoology, Terrestrial Ecology, University of Cologne, Zülpicher Str. 47b, 50674 Köln, Germany.

Tree canopies are colonized by billions of highly specialized microorganisms that are well adapted to the highly variable microclimatic conditions, caused by diurnal fluctuations and seasonal changes. In this study, we investigated seasonality patterns of protists in the tree canopies of a temperate floodplain forest via high-throughput sequencing with group-specific primers for the phyla Cercozoa and Endomyxa. We observed consistent seasonality, and identified divergent spring and autumn taxa. Read More

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Seasonal variation in neurohormones, mood and sleep in patients with primary open angle glaucoma - implications of the ipRGC-system.

Chronobiol Int 2021 Oct 10;38(10):1421-1431. Epub 2021 Jun 10.

Department of Ophthalmology, Rigshospitalet-Glostrup Hospital, Copenhagen, Denmark.

Primary open angle glaucoma is associated with an increased risk of mood and sleep disorders. These adversities have been suggested to relate to a disrupted function of the intrinsically photosensitive retinal ganglion cells (ipRGCs). The ipRGCs are key components in the nonvisual photoreceptive system that mediates light effects on mood, sleep and circadian rhythm. Read More

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October 2021

Prevalence of Allergic Sensitization in Childhood Asthma.

Cureus 2021 May 29;13(5):e15311. Epub 2021 May 29.

Pediatrics, Kalinga Institute of Medical Sciences, Bhubaneswar, IND.

Introduction The allergic sensitization in childhood asthma is common and the prevalence varies in different geographical locations. The data on allergen sensitization to guide clinicians on allergy avoidance is limited. Method This prospective observational study was conducted between October 2019 and April 2020 on children aged two to 14 years attending an outpatient clinic. Read More

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Evolution of Reproductive Life History in Mammals and the Associated Change of Functional Constraints.

Genes (Basel) 2021 05 14;12(5). Epub 2021 May 14.

Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo Ward, Tokyo 113-8657, Japan.

Phylogenetic trees based on multiple genomic loci enable us to estimate the evolution of functional constraints that operate on genes based on lineage-specific fluctuation of the evolutionary rate at particular gene loci, "gene-branch interactions". Using this information as predictors, our previous work inferred that the common ancestor of placental mammals was nocturnal, insectivorous, solitary, and bred seasonally. Here, we added seven new continuous traits including lifespan, bodyweight, and five reproduction-related traits and inferred the coevolution network of 14 core life history traits for 89 mammals. Read More

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Interactive effects of groundwater level and salinity on soil respiration in coastal wetlands of a Chinese delta.

Environ Pollut 2021 Oct 19;286:117400. Epub 2021 May 19.

State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.

Coastal wetland soils serve as a great C sink or source, which highly depends on soil carbon flux affected by complex hydrology in relation to salinity. We conducted a field experiment to investigate soil respiration of three coastal wetlands with different land covers (BL: bare land; SS: Suaeda salsa; PL: Phragmites australis) from May to October in 2012 and 2013 under three groundwater tables (deeper, medium, and shallower water tables) in the Yellow River Delta of China, and to characterize the spatial and temporal changes and the primary environmental drivers of soil respiration in coastal wetlands. Our results showed that the elevated groundwater table decreased soil CO emissions, and the soil respiration rates at each groundwater table exhibited seasonal and diurnal dynamics, where significant differences were observed among coastal wetlands with different groundwater tables (p < 0. Read More

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October 2021

Source attribution of air pollution using a generalized additive model and particle trajectory clusters.

Sci Total Environ 2021 Aug 23;780:146458. Epub 2021 Mar 23.

University of Wisconsin - Madison, Environmental Chemistry and Technology Program, Madison, WI, USA; Wisconsin State Laboratory of Hygiene, Madison, WI, USA.

Speciated hourly measurements of fine aerosols were made for more than two years at an urban, an industrial and a port site in Busan, Korea. A Generalized Additive Model (GAM) was designed to deconvolve factors contributing to the pollutant concentrations at multiple scales. The model yields estimates of source contributions to pollution by separately identifying the signals in the time series due to meteorology, vertical mixing, horizontal wind transport and temporal variations such as diurnal, weekly, seasonal and annual trends. Read More

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Association between meteorological factors and daily new cases of COVID-19 in 188 countries: A time series analysis.

Sci Total Environ 2021 Aug 23;780:146538. Epub 2021 Mar 23.

Department of Epidemiology and Biostatics, School of Public Health, Peking University, No. 38, Xueyuan Road, Haidian District, Beijing 100191, China. Electronic address:

By 31 December 2020, Coronavirus disease 2019 (COVID-19) had been prevalent worldwide for one year, and most countries had experienced a complete seasonal cycle. The role of the climate and environment are essential factors to consider in transmission. We explored the association between global meteorological conditions (including mean temperature, wind speed, relative humidity and diurnal temperature range) and new cases of COVID-19 in the whole past year. Read More

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Ebullition Controls on CH Emissions in an Urban, Eutrophic River: A Potential Time-Scale Bias in Determining the Aquatic CH Flux.

Environ Sci Technol 2021 06 18;55(11):7287-7298. Epub 2021 May 18.

Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China.

Rivers and streams contribute significant quantities of methane (CH) to the atmosphere. However, there is a lack of CH flux and ebullitive (bubble) emission data from urban rivers, which might lead to large underestimations of global aquatic CH emissions. Here, we conducted high-frequency surveys using the boundary layer model (BLM) supplemented with floating chambers (FCs) and bubble traps to investigate the seasonal and diurnal variability in CH emissions in a eutrophic urban river and to evaluate whether the contribution of bubbles is important. Read More

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A small neighborhood well-organized: seasonal and daily activity patterns of the community of large and mid-sized mammals around waterholes in the Gobi Desert, Mongolia.

Front Zool 2021 May 17;18(1):25. Epub 2021 May 17.

School of Arts and Sciences, National University of Mongolia, Ulaanbaatar, Mongolia.

Background: Animal communities have complex patterns of ecological segregation at different levels according to food resources, habitats, behavior, and activity patterns. Understanding these patterns among the community is essential for the conservation of the whole ecosystem. However, these networks are difficult to study nowadays, due to anthropic disturbances and local extinctions, making it difficult to conclude if segregation patterns are natural or human-induced. Read More

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Interannual and seasonal variabilities in soil NO fluxes from a rainfed maize field in the Northeast China.

Environ Pollut 2021 Oct 5;286:117312. Epub 2021 May 5.

CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China; Key Laboratory of Isotope Techniques and Applications, Shenyang, 110016, China. Electronic address:

Nitric oxide (NO) plays a critical role in atmospheric chemistry and also is a precursor of nitrate, which affects particle matter formation and nitrogen deposition. Agricultural soil has been recognized as a main source of atmospheric NO. However, quantifying the NO fluxes emitted from croplands remains a challenge and in situ long-term measurements of NO are still limited. Read More

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October 2021

Quantitative estimation of meteorological impacts and the COVID-19 lockdown reductions on NO and PM over the Beijing area using Generalized Additive Models (GAM).

J Environ Manage 2021 Aug 4;291:112676. Epub 2021 May 4.

Institute of Urban Meteorology, China Meteorological Administration, Beijing, China.

Unprecedented travel restrictions due to the COVID-19 pandemic caused remarkable reductions in anthropogenic emissions, however, the Beijing area still experienced extreme haze pollution even under the strict COVID-19 controls. Generalized Additive Models (GAM) were developed with respect to inter-annual variations, seasonal cycles, holiday effects, diurnal profile, and the non-linear influences of meteorological factors to quantitatively differentiate the lockdown effects and meteorology impacts on concentrations of nitrogen dioxide (NO) and fine particulate matters (PM) at 34 sites in the Beijing area. The results revealed that lockdown measures caused large reductions while meteorology offset a large fraction of the decrease in surface concentrations. Read More

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Parameterized atmospheric oxidation capacity and speciated OH reactivity over a suburban site in the North China Plain: A comparative study between summer and winter.

Sci Total Environ 2021 Jun 23;773:145264. Epub 2021 Jan 23.

Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; University of the Chinese Academy of Sciences, Beijing 100049, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China. Electronic address:

The atmospheric oxidation capacity (AOC) and photochemical reactivity are of increasing concern owing to their roles in photochemical pollution. The AOC and OH reactivity were evaluated based on simultaneous measurements of volatile organic compounds (VOCs), trace gases and photolysis frequency during summer and winter campaigns at a suburban site in Xianghe. The AOC exhibited well-defined seasonal and diurnal patterns, with higher intensities during the summertime and daytime than during the wintertime and nighttime, respectively. Read More

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Time Series Forecasting of Univariate Agrometeorological Data: A Comparative Performance Evaluation via One-Step and Multi-Step Ahead Forecasting Strategies.

Sensors (Basel) 2021 Apr 1;21(7). Epub 2021 Apr 1.

Centre of Studies in Resources Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India.

High-frequency monitoring of agrometeorological parameters is quintessential in the domain of Precision Agriculture (PA), where timeliness of collected observations and the ability to generate ahead-of-time predictions can substantially impact the crop yield. In this context, state-of-the-art internet-of-things (IoT)-based sensing platforms are often employed to generate, pre-process and assimilate real-time data from heterogeneous sensors and streaming data sources. Simultaneously, Time-Series Forecasting Algorithms (TSFAs) are responsible for generating reliable forecasts with a pre-defined forecast horizon and confidence. Read More

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Identifying dominant environmental predictors of freshwater wetland methane fluxes across diurnal to seasonal time scales.

Glob Chang Biol 2021 08 29;27(15):3582-3604. Epub 2021 May 29.

Department of Earth System Science, Stanford University, Stanford, CA, USA.

While wetlands are the largest natural source of methane (CH ) to the atmosphere, they represent a large source of uncertainty in the global CH budget due to the complex biogeochemical controls on CH dynamics. Here we present, to our knowledge, the first multi-site synthesis of how predictors of CH fluxes (FCH4) in freshwater wetlands vary across wetland types at diel, multiday (synoptic), and seasonal time scales. We used several statistical approaches (correlation analysis, generalized additive modeling, mutual information, and random forests) in a wavelet-based multi-resolution framework to assess the importance of environmental predictors, nonlinearities and lags on FCH4 across 23 eddy covariance sites. Read More

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