SNIP measures contextual citation impact by weighting citations based on the total number of citations in a subject field.
SJR is a prestige metric based on the idea that not all citations are the same. SJR uses a similar algorithm as the Google page rank; it provides a quantitative and a qualitative measure of the journal’s impact.
The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years.
© Thomson Reuters Journal Citation Reports 2015
To calculate the five year Impact Factor, citations are counted in 2014 to the previous five years and divided by the source items published in the previous five years.
© Journal Citation Reports 2015, Published by Thomson Reuters
An ever changing global system defines the scientific and social problems and issues of our time. The majority of these problems clearly cross traditional scientific boundaries.
The objective of the journal Global and Planetary Change is to achieve a multidisciplinary view of the causes, processes and limits of variability in planetary change. The journal focuses on the record of change in earth history and the analysis and prediction of recent and future changes. Topics include, but are not limited to, changes in the chemical composition of the oceans and atmosphere, climate change, sea level variations, human geography, global geophysics and tectonics, global ecology, biogeography, sustainability and resilience.
Key criteria for manuscripts are global scope or implications for global scale problems, significance beyond a single discipline and a focus on the causes, processes and limits of planetary change. Manuscripts can be submitted as either research contributions or as review articles. Extra effort should be directed towards presenting problems and results for a broad readership. Part of the intent of Global and Planetary Change is for new discoveries or progress in one discipline to foster advances, or act as a catalyst, in understanding the earth as a system.
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