Real-time automatic interpolation of ambient gamma dose rates from the Dutch radioactivity monitoring network

Hiemstra, Paul H.; Pebesma, Edzer; Twenhöfel, C.; Heuvelink, G.B.M.

doi:10.1016/j.cageo.2008.10.011

Cited by 396 publications

(238 citation statements)

References 12 publications

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“…Kriging analysis was performed with the "gstat" package (Pebesma 2004). Variogram fitting for each variable was optimized using iterative re-weighted least squares using the "automap" package (Hiemstra et al 2009). Pairwise Wilcoxon Rank Sum Test was used to compare statistical differences between inflow and outflow nutrients, sediment and carbon loads.…”

Section: Discussionmentioning

confidence: 99%

Autochthonous and Allochthonous Carbon Cycling in a Eutrophic Flow-Through Wetland

2014

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Wetland environments are important sites for the cycling and retention of terrestrially derived organic matter and nutrients. Wetland treatment of agricultural runoff has been shown to improve water quality and promote carbon sequestration. However, the potential role of eutrophic wetlands as a source of algal loading contributing to downstream hypoxia has prompted interest in understanding algal productivity and export from these systems. This study, in the San Joaquin Valley, California, quantified a mass balance of carbon and nutrients within a seasonally-saturated constructed wetland receiving agricultural runoff, as well as quantifying autochthonous carbon production on four sampling dates during a year with minimal emergent vegetation. Results from this study show that the wetland was a net-sink for nutrients and particulate/dissolved organic carbon. Despite high concentrations of inflowing nutrients and high rates of primary productivity, high respiration rates limited net organic C production and export due to high heterotrophic activity. The addition of high C loads in inflowing water and moderate retention efficiencies, however, resulted in a positive C retention during most sampling dates. This study provides valuable insight into the connection between elevated carbon and nutrient inflows, their effects on autochthonous carbon production, and resulting carbon and nutrient outflows.

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Section: Discussionmentioning

confidence: 99%

Autochthonous and Allochthonous Carbon Cycling in a Eutrophic Flow-Through Wetland

2014

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“…the lag. More details on the automatic variogram fitting may be found in Hiemstra et al (2009). A station-gridpoint comparison was performed at seasonal scale to assess the quality of the interpolated data.…”

Section: Climate Observations and Interpolationmentioning

confidence: 99%

“…KED is the kriging with external drift method which is similar to regression kriging (Hengl et al, 2007). An automated interpolation based on the AUTOMAP R packages (R Core Team, 2016;Hiemstra et al, 2009) has been used in this study.…”

Section: Frost Stress Crop Model and Pea Parametersmentioning

confidence: 99%

Frost stress evolution and winter pea ideotype in the context of climate warming at a regional scale

Castel

Lecomte

Richard

et al. 2017

OCL

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-Pea (Pisum sativum L.) is an important crop in temperate regions for its high seed protein concentration that is particularly sensitive to abiotic stresses. The abrupt temperature increase known as the "1987/1988 temperature regime shift" that occurs over Europe is questioning how winter pea will perform in the changing climate. This study assessed the winter frost damage evolution along from 1961 to 2015 in Burgundy-Franche-Comté by using: (1) daily observed and gridded regional temperature data and (2) a validated crop winter frost stress model calibrated for pea. This study shows a global decrease of the frost stress nevertheless resulting from a subtle balance between the decrease in its intensity and the increase of the number of events. The frost stress evolution patterns with warming depend on both plant frost resistance level and acclimation rate and are still sensitive to winter climate fluctuations. This study provides relevant information for breeding performant winter crop ideotypes able to moderate detrimental effects of climate change and offering new cropping opportunities in temperate regions.

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“…Spatial grids.-Environmental variables were measured at each gill-net set (n = 24,756) and subsequently interpolated into raster grids using ordinary kriging (Saveliev et al 2007;Elith et al 2008; via the "autoKrige" function in the automap package in R (Hiemstra et al 2009). Environmental grids were developed for each month (April, May, June, September, October, and November) and year combination between 1980 and 2012 to permit spatially specific predictions during specific months and/or time periods.…”

Section: Froeschke and Froeschkementioning

confidence: 99%

Two‐Stage Boosted Regression Tree Model to Characterize Southern Flounder Distribution in Texas Estuaries at Varying Population Sizes

Froeschke

2016

Mar Coast Fish

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Linking trends in fish population abundance to environmental characteristics is often difficult because fish use a variety of habitats throughout their ontogeny and may exhibit large interannual fluctuations in abundance. We developed a two‐stage boosted regression tree model to investigate spatiotemporal patterns of Southern Flounder Paralichthys lethostigma abundance and distribution in Texas estuaries. We used a 36‐year fishery‐independent data set (1977–2012) to correlate distribution with environmental conditions and seasonal or long‐term changes in abundance. Adult Southern Flounder were sampled with gill nets using a random‐stratified design. Predictions of abundance were made to grids of environmental data to identify “hot spots” as well as seasonal or decadal shifts in distribution. Models were fit using cross validation, and variance was estimated using nonparametric bootstrapping. Depth, temperature, distance to a tidal inlet, and salinity were the primary environmental determinants of Southern Flounder distribution and abundance. Because distribution and response to environmental conditions can depend on population abundance, we also developed a standardized index of annual abundance using the same two‐stage boosted regression tree model. The index identifies a long‐term decline in abundance punctuated by recent recovery (possibly in response to management actions). Mapped results identify a coastwide decline in abundance between 1980–1984 and 2005–2009 but the magnitude varied substantially, suggesting disproportionate changes in abundance across the study area. Received April 10, 2015; accepted July 28, 2015

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Real-time automatic interpolation of ambient gamma dose rates from the Dutch radioactivity monitoring network

Cited by 396 publications

References 12 publications

Autochthonous and Allochthonous Carbon Cycling in a Eutrophic Flow-Through Wetland

Autochthonous and Allochthonous Carbon Cycling in a Eutrophic Flow-Through Wetland

Frost stress evolution and winter pea ideotype in the context of climate warming at a regional scale

Two‐Stage Boosted Regression Tree Model to Characterize Southern Flounder Distribution in Texas Estuaries at Varying Population Sizes

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