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The Earth and life sciences are replete with portmanteau (blended) words and neologisms. Researchers at the interfaces between the traditional disciplines within the Earth and life sciences have coined dual titles for ‘new’ disciplines, such as geobiology/biogeology and ecohydrology/hydroecology. An upsurge in such coinage over the last few decades reflects a healthy willingness of many researchers to cross traditional disciplinary boundaries and to include the human sphere within their domains. However, some of the titles cause confusion because their meanings are not self-evident; rather, they sometimes demand extra research to reveal their meanings, thus rendering science less ‘open’ at a time when Open Science is being vigorously encouraged. After discussing the question of disciplinary neologisms, the paper probes the interchangeability of 15 dual ‘new’ discipline titles and concludes that six are more-or-less synonymous, three are nonsynonymous, and six are indeterminate for varying reasons. We question the usefulness of some, but by no means all, disciplinary neologisms, given that their meanings are not immediately apparent. Looking beyond portmanteau titles and other neologisms, the paper discusses the rise of interdisciplinary and transdisciplinary research, as seen in the concepts of the Critical Zone, multifunctional landscapes, and Earth System Science, the last of which supports a conceptual model of the planet as an interdependent set of spheres from global to local scales that has the advantages of combining the biotic, abiotic, and human spheres. [ABSTRACT FROM AUTHOR]

ESA's Next Generation Gravity Mission (NGGM) is a candidate Mission of Opportunity for ESA–NASA cooperation in the frame of the Mass Change and Geosciences International Constellation (MAGIC). The mission aims at enabling long-term monitoring of the temporal variations of Earth's gravity field at relatively high temporal (down to 3 days) and increased spatial resolutions (up to 100 km) at longer time intervals. This implies also that time series of GRACE and GRACE-FO can be extended towards a climate series. Such variations carry information about mass change induced by the water cycle and the related mass exchange among atmosphere, oceans, cryosphere, land and solid Earth and will complete our picture of global and climate change. The main observable is the variation of the distance between two satellites measured by a ranging instrument. This is complemented by accelerometers that measure the nongravitational accelerations, which need to be reduced from ranging measurements to obtain the gravity signal. The preferred satellite constellation comprises one satellite pair in a near-polar and another in an inclined circular orbit. The paper focuses on the orbit selection methods for optimizing the spatial sampling for multiple temporal resolutions and then on the methodology for deriving the engineering requirements for the space segment, together with a discussion on the main mission parameters. [ABSTRACT FROM AUTHOR]