Technical FAQs

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What does RP mean?

RP stands for “Release Point”. In the IT-OSRA method, we address the widest range of spill scenarios occurred off the coastline of interest and the simulated spills are originated at the pre-set RPs.

What is the unit of measure of the Oil Spill Hazard maps?

As the reader will realize, GLAMOR is a website under construction, especially due to the large computational time necessary to perform the full experiment. The growing dataset is constantly bringing us new insights and our methods for evaluating the outputs are evolving with time.

We have observed that beached oil concentrations can be described, no matter which part of the Atlantic you are interested in, by a Weibull distribution. The Weibull distribution (W) can be described by:

where η and β are the Weibull scale and shape parameters, and x is the beached oil concentration (in tons/km).

For now, the Oil Spill Hazard (OSH) index is being computed as the probability of observing beaching events above a certain concentration of interest xcut. The OSH index has been therefore summarized into the following equation:

where cdf(xcut) is the Cumulative Distribution Function for the Weibull distribution at concentration xcut. The equation can be reworked into:

where, again, η and β and are the Weibull scale and shape parameters. For now, the minimum concentration of interest (xcut) has been defined as 25 tons/km. The threshold has been proposed by the ITOPF Technical Information paper on Recognition of oil on shorelines (http://www.itopf.com/knowledge-resources/documents-guides/document/tip-6-recognition-of-oil-on- shorelines/) as an indicator of heavy oiling events.

How were the ensemble members defined?

The ensemble members configuration was based on the available literature, trying to cover the uncertainties typically observed in oil spill events (see Sepp Neves et al., 2015 and 2016). Further information can be found in the description of our scientific methodology.

Can I use the GLAMOR results to have a reliable estimate of the hazard at my beach?

No. GLAMOR was thought and executed focused on giving a general picture of the oil spill hazard in the Atlantic basin at the national level. In other words, our experiment is focused on describing the bigger picture and the results may not be applicable in the fine scale. We should always bear in mind that the ocean fields used have a 1/12-degree spatial resolution and do not fully reproduce the circulation in the scale of hundreds of meters (i.e. one beach).