Results 61 to 70 of about 20,430 (260)

Hidden Markov Quantile Models With Trends for Analysing Air Temperature Data

International Journal of Climatology, EarlyView.
There is the question of whether climate change, expressed by time‐trends in temperature, is of a heterogeneous nature or not. Here, the time‐trend heterogeneity argument has been investigated using Hidden Markov (HM) quantile time‐trends models in temperature time series.
Georgios Tsiotas, Athanassios Argiriou, Anna Mamara   +2 more
wiley   +1 more source

Phenological drivers of ungulate migration in South America: characterizing the movement and seasonal habitat use of guanacos

Movement Ecology, 2022
Background Migration is a widespread strategy among ungulates to cope with seasonality. Phenology, especially in seasonally snow-covered landscapes featuring “white waves” of snow accumulation and “green waves” of plant green-up, is a phenomenon that ...
Malena Candino, Emiliano Donadio, Jonathan N. Pauli   +2 more
doaj   +1 more source

Mapping Crop Cycles in China Using MODIS-EVI Time Series [PDF]

, 2014
As the Earth’s population continues to grow and demand for food increases, the need for improved and timely information related to the properties and dynamics of global agricultural systems is becoming increasingly important.
Friedl, Mark A, Frolking, Steve, Gray, Josh M, Li, Le, pan, Yaozhong, Xin, Qinchuan   +5 more
core   +3 more sources

A 20-Year MODIS-Based Snow Cover Dataset for Svalbard and Its Link to Phenological Timing and Sea Ice Variability [PDF]

Remote Sensing, 2020
The climate in Svalbard has been warming dramatically compared with the global average for the last few decades. Seasonal snow cover, which is sensitive to temperature and precipitation changes, is therefore expected to undergo both spatial and temporal changes in response to the changing climate in Svalbard.
Hannah Vickers, Stein Rune Karlsen, Eirik Malnes   +2 more
openaire   +3 more sources

Seasonal variation of leaf functional traits in sub‐Arctic plants

Oikos, EarlyView.
Leaf functional traits are informative of plant fitness and functions in ecosystems. These functional traits and their variation across geographic extents are much studied but less is known about their temporal variation over a growing season. Here, we provide an analysis of the seasonal variation in six leaf functional traits of 11 sub‐Arctic vascular
Pekka Niittynen, Marija Merkurjeva, Julia Kemppinen   +2 more
wiley   +1 more source

Semi-Automatic Fractional Snow Cover Monitoring from Near-Surface Remote Sensing in Grassland

Remote Sensing, 2021
Snow cover is an important variable in both climatological and hydrological studies because of its relationship to environmental energy and mass flux. However, variability in snow cover can confound satellite-based efforts to monitor vegetation phenology.
Anaí Caparó Bellido, Bradley C. Rundquist   +1 more
doaj   +1 more source

Bioclimatic, demographic and anthropogenic correlates of grizzly bear activity patterns in the Greater Yellowstone Ecosystem

Oikos, EarlyView.
Plasticity of diel activity rhythms may be a key element for adaptations of wildlife populations to changing environmental conditions. In the last decades, grizzly bears Ursus arctos in the Greater Yellowstone Ecosystem (GYE) have experienced notable environmental fluctuations, including changes in availability of food sources and severe droughts ...
Aurora Donatelli, Mark A. Haroldson, Justin G. Clapp, Paolo Ciucci, Frank T. van Manen   +4 more
wiley   +1 more source

Record phenological responses to climate change in three sympatric penguin species. [PDF]

J Anim Ecol
This paper is impressive because we managed to monitor extensively a really difficult place to reach and operate in. We deployed 77 cameras across Antarctica and the Sub Antarctic islands to monitor three different species of penguins. We found that they are the fastest advancing vertebrates with respect to their timing of breeding.
Juarez Martinez I, Kacelnik A, Jones FM, Hinke JT, Dunn MJ, Raya Rey A, Lynch HJ, Owen K, Hart T.   +8 more
europepmc   +2 more sources

Green-Down Protocol [PDF]

, 2003
The purpose of this resource is to observe plant green-down and report greendown data to help validate estimates of the end of the plant growing season. Students monitor the change in color of selected leaves of trees, shrubs or grasses.
The GLOBE Program, University Corporation for Atmospheric Research (UCAR)
core  

Changes in alpine plant growth under future climate conditions [PDF]

, 2010
Alpine shrub- and grasslands are shaped by extreme climatic conditions such as a long-lasting snow cover and a short vegetation period. Such ecosystems are expected to be highly sensitive to global environmental change.
A. Rammig, C. Rixen, N. E. Zimmermann, T. Jonas   +3 more
core   +2 more sources