Climatologies at high resolution for the earth’s land surface areas

Karger, Dirk Nikolaus; Conrad, Olaf; Böhner, Jürgen; Kawohl, Tobias; Kreft, Holger; Soria-Auza, Rodrigo W.; Zimmermann, Niklaus E.; Linder, H. Peter; Kessler, Michael

doi:10.1038/sdata.2017.122

Cited by 2,866 publications

(2,734 citation statements)

References 60 publications

Supporting

Mentioning

2,457

Contrasting

Unclassified

Order By: Relevance

“…Climatic data sets for the earth land surface area were downloaded from CHELSA (Karger et al 2017). Using the R package ''raster'' version 2.5-8 (Hijmans and van Etten 2012), all 19 bioclimatic variable data (BIO1 to BIO19) were extracted for the period 1979-2013 for each accession according to the GPS coordinates of the original collection site (Table S1).…”

Section: Climate Datamentioning

confidence: 99%

Exploring the natural variation for reproductive thermotolerance in wild tomato species

et al. 2018

View full text Add to dashboard Cite

Climate change has become a serious threat for crop productivity worldwide. The increased frequency of heat waves strongly affects reproductive success and thus yield for many crop species, implying that breeding for thermotolerant cultivars is critical for food security. Insight into the genetic architecture of reproductive heat tolerance contributes to our fundamental understanding of the stress sensitivity of this process and at the same time may have applied value. In the case of tomato (Solanum lycopersicum), germplasm screenings for thermotolerance have often used yield as the main measured trait. However, due to the complex nature of yield and the relatively narrow genetic variation present in the cultivated germplasm screened, there has been limited progress in understanding the genetic basis of reproductive heat tolerance. Extending the screening to wild accessions of related species that cover a range of climatic conditions might be an effective approach to find novel, more tolerant genetic resources. The purpose of this study was to provide insight into the sensitivity of individual reproductive key traits (i.e. the number of pollen per flower, pollen viability and style protrusion) to heat-wave like long-term mild heat (LTMH), and determine the extent to which genetic variation exists for these traits among wild tomato species. We found that these traits were highly variable among the screened accessions. Although no overall thermotolerant species were identified, several S. pimpinellifolium individuals outperformed the best performing cultivar in terms of pollen viability under LTMH. Furthermore, we reveal that there has been local adaptation of reproductive heat tolerance, as accessions from lower elevations and higher annual temperature are more likely to show high pollen viability under LTMH.

show abstract

Section: Climate Datamentioning

confidence: 99%

Exploring the natural variation for reproductive thermotolerance in wild tomato species

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Karger et al (2017) reconstructed the dynamics of the westerlies in the Ili Basin, proposing a rain belt which seasonally migrates towards the south and north in autumn and summer, respectively. A strengthened Siberian High would push the mid-latitude westerlies pathways further to the south, resulting in comparably drier conditions in northeastern Central Asia (e.g., Tian Shan) and conversely, wetter conditions in southwestern Central Asia (Pamir) (Lei et al, 2014;Wolff et al, 2017).…”

mentioning

confidence: 99%

Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin

Song

Fitzsimmons

et al. 2018

Clim. Past

View full text Add to dashboard Cite

Abstract. The extensive loess deposits of the Eurasian midlatitudes provide important terrestrial archives of Quaternary climatic change. As yet, however, loess records in Central Asia are poorly understood. Here we investigate the grain size and magnetic characteristics of loess from the Nilka (NLK) section in the Ili Basin of eastern Central Asia. Weak pedogenesis suggested by frequency-dependent magnetic susceptibility (χ fd %) and magnetic susceptibility (MS) peaks in primary loess suggest that MS is more strongly influenced by allogenetic magnetic minerals than pedogenesis, and may therefore be used to indicate wind strength. This is supported by the close correlation between variations in MS and proportions of the sand-sized fraction. To further explore the temporal variability in dust transport patterns, we identified three grain size end-members (EM1, mode size 47.5 µm; EM2, 33.6 µm; EM3, 18.9 µm) which represent distinct aerodynamic environments. EM1 and EM2 are inferred to represent grain size fractions transported from proximal sources in short-term, near-surface suspension during dust outbreaks. EM3 appears to represent a continuous background dust fraction under non-dust storm conditions. Of the three end-members, EM1 is most likely the most sensitive recorder of wind strength. We compare our EM1 proportions with mean grain size from the Jingyuan section in the Chinese loess plateau, and assess these in the context of modern and Holocene climate data. Our research suggests that the Siberian High pressure system is the dominant influence on wind dynamics, resulting in loess deposition in the eastern Ili Basin. Six millennial-scale cooling (Heinrich) events can be identified in the NLK loess records. Our grain size data support the hypothesis that the Siberian High acts as teleconnection between the climatic systems of the North Atlantic and East Asia in the high northern latitudes, but not for the mid-latitude westerlies.

show abstract

“…Commonly used climatic datasets with a comparable spatial resolution are WorldClim (http://worldclim.org/, [49]), and CHELSA (http://chelsa-climate.org/, [50]). These datasets, however, provide long-term statistics for past time periods such as the average for the years 1970-2000 for average monthly temperatures and not up-to-date time series with, e.g., monthly average temperature for the year 2016, not to mention daily temperature time series.…”

Section: Discussionmentioning

confidence: 99%

A New Fully Gap-Free Time Series of Land Surface Temperature from MODIS LST Data

2017

View full text Add to dashboard Cite

Temperature time series with high spatial and temporal resolutions are important for several applications. The new MODIS Land Surface Temperature (LST) collection 6 provides numerous improvements compared to collection 5. However, being remotely sensed data in the thermal range, LST shows gaps in cloud-covered areas. We present a novel method to fully reconstruct MODIS daily LST products for central Europe at 1 km resolution and globally, at 3 arc-min. We combined temporal and spatial interpolation, using emissivity and elevation as covariates for the spatial interpolation. The reconstructed MODIS LST for central Europe was calibrated to air temperature data through linear models that yielded R 2 values around 0.8 and RMSE of 0.5 K. This new method proves to scale well for both local and global reconstruction. We show examples for the identification of extreme events to demonstrate the ability of these new LST products to capture and represent spatial and temporal details. A time series of global monthly average, minimum and maximum LST data and long-term averages is freely available for download.

show abstract

Climatologies at high resolution for the earth’s land surface areas

Cited by 2,866 publications

References 60 publications

Exploring the natural variation for reproductive thermotolerance in wild tomato species

Exploring the natural variation for reproductive thermotolerance in wild tomato species

Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin

A New Fully Gap-Free Time Series of Land Surface Temperature from MODIS LST Data

Contact Info

Product

Resources

About