A Global Inventory of Ice‐Related Morphological Features on Dwarf Planet Ceres: Implications for the Evolution and Current State of the Cryosphere

We present a comprehensive global catalog of the geomorphological features with clear or potential relevance to subsurface ice identified during the Dawn spacecraft's primary and first extended missions at Ceres. We define eight broad feature classes and describe analyses supporting their genetic links to subsurface ice. These classes include relaxed craters; central pit craters; large domes; small mounds; lobate landslides and ejecta; pitted materials; depressions and scarps; and fractures, grooves, and channels. Features in all classes are widely distributed on the dwarf planet, consistent with multiple lines of observational evidence that ice is a key component of Ceres' crust. Independent analyses of multiple feature types suggest rheological and compositional layering may be common in the upper ~10 km of the crust. Clustering of features indicates that ice concentration is heterogeneous on nearly all length scales, from ~1 km to hundreds of kilometers. Impacts are likely the key driver of heterogeneity, causing progressive devolatilization of the low latitude and midlatitude crust on billion‐year timescales but also producing localized enhancements in near surface ice content via excavation of deep ice‐rich material and possible facilitation of cryomagmatic and cryovolcanic activity. Impacts and landslides may be the dominant mechanism for ice loss on modern Ceres. Our analysis suggests specific locations where future high‐resolution imaging can be used to probe (1) current volatile loss rates and (2) the history of putative cryomagmatic and cryovolcanic features. The Cerean cryosphere and its unique morphology promise to be a rich subject of ongoing research for years to come

Agregando forças, reunindo competências: parcerias para o desenvolvimento sustentável.

As parcerias multissetoriais, pelo potencial que apresentam para alavancar o desenvolvimento, receberam atenção especial no âmbito do Objetivo de Desenvolvimento Sustentável (ODS) 17, em que estão incluídas, entre as questões sistêmicas, duas metas especificamente dirigidas à celebração de parcerias: Meta 17.16 ? Reforçar a parceria global para o desenvolvimento sustentável, complementada por parcerias multissetoriais que mobilizem e compartilhem conhecimento, expertise, tecnologia e recursos financeiros, para apoiar a realização dos objetivos do desenvolvimento sustentável em todos os países, em particular nos países em desenvolvimento. Meta 17.17 ? Incentivar e promover parcerias públicas, público-privadas e com a sociedade civil eficazes, a partir da experiência de estratégias de mobilização de recursos dessas parcerias. Ainda que envolvam temas específicos distintos, ambas as metas têm como cerne a mobilização de recursos e o compartilhamento e uso de conhecimentos e experiências. Se, por um lado, os recursos são essenciais para a realização de quaisquer ações, por outro, é o compartilhamento e uso do estoque de conhecimentos e experiências que permitirá uma jornada mais eficaz rumo ao alcance dos ODS. Não se trata somente de replicar modelos bem-sucedidos de cooperação, mas de utilizar o conhecimento adquirido no dia a dia das parcerias para adaptar boas estratégias a novas demandas e geografias e, onde não for possível, ir além: criar modelos inovadores que guardem em si os elementos-chave de sucesso identificados nas experiências prévias. Neste capítulo, são apresentadas algumas parcerias multissetoriais em que a Empresa Brasileira de Pesquisa Agropecuária (Embrapa) participa. Não é intenção inventariar aqui todas as parcerias estabelecidas pela Empresa, tampouco descrever os muitos e relevantes resultados obtidos, mas sim destacar algumas estratégias de cooperação bem-sucedidas. Assim, procura-se indicar alguns caminhos e possibilidades que possam servir de inspiração e estímulo a instituições similares à Embrapa

A Global Inventory of Ice‐Related Morphological Features on Dwarf Planet Ceres: Implications for the Evolution and Current State of the Cryosphere

We present a comprehensive global catalog of the geomorphological features with clear or potential relevance to subsurface ice identified during the Dawn spacecraft's primary and first extended missions at Ceres. We define eight broad feature classes and describe analyses supporting their genetic links to subsurface ice. These classes include relaxed craters; central pit craters; large domes; small mounds; lobate landslides and ejecta; pitted materials; depressions and scarps; and fractures, grooves, and channels. Features in all classes are widely distributed on the dwarf planet, consistent with multiple lines of observational evidence that ice is a key component of Ceres' crust. Independent analyses of multiple feature types suggest rheological and compositional layering may be common in the upper similar to 10 km of the crust. Clustering of features indicates that ice concentration is heterogeneous on nearly all length scales, from similar to 1 km to hundreds of kilometers. Impacts are likely the key driver of heterogeneity, causing progressive devolatilization of the low latitude and midlatitude crust on billion-year timescales but also producing localized enhancements in near surface ice content via excavation of deep ice-rich material and possible facilitation of cryomagmatic and cryovolcanic activity. Impacts and landslides may be the dominant mechanism for ice loss on modern Ceres. Our analysis suggests specific locations where future high-resolution imaging can be used to probe (1) current volatile loss rates and (2) the history of putative cryomagmatic and cryovolcanic features. The Cerean cryosphere and its unique morphology promise to be a rich subject of ongoing research for years to come.NASA's Dawn at Ceres Guest Investigator Program; NASA Discovery Program Office6 month embargo; published online: 2 July 2019This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

A Global Inventory of Ice-Related Morphological Features on Dwarf Planet Ceres: Implications for the evolution and current state of the cryosphere

We present a comprehensive global catalog of the geomorphological features with clear orpotential relevance to subsurface ice identified during the Dawn spacecraft’s primary and first extended missions at Ceres. We define eight broad feature classes and describe analyses supporting their genetic links to subsurface ice. These classes include relaxed craters; central pit craters; large domes; small mounds; lobate landslides and ejecta; pitted materials; depressions and scarps; and fractures, grooves, and channels. Features in all classes are widely distributed on the dwarf planet, consistent with multiple lines of observational evidence that ice is a key component of Ceres’ crust. Independent analyses of multiple feature types suggest rheological and compositional layering may be common in the upper ~10 km of the crust. Clustering of features indicates that ice concentration is heterogeneous on nearly all length scales, from ~1 km to hundreds of kilometers. Impacts are likely the key driver of heterogeneity, causing progressive devolatilization of the low latitude and midlatitude crust on billion-year timescales but also producing localized enhancements in near surface ice content via excavation of deep ice-rich material and possible facilitation of cryomagmatic and cryovolcanic activity. Impacts and landslides may be the dominant mechanism for ice loss on modern Ceres. Our analysis suggests specific locations where future high-resolution imaging can be used to probe (1) current volatile loss rates and (2) the history of putative cryomagmatic and cryovolcanic features. The Cerean cryosphere and its unique morphology promise to be a rich subject of ongoing research for years to come

Recent advances of marine ornamental fish larviculture: broodstock reproduction, live prey and feeding regimes, and comparison between demersal and pelagic spawners

Marine ornamental fish are a key component of the multimillion‐dollar marine aquarium trade industry, a controversial industry due to current heavy reliance on wild‐collected specimens. Aquaculture of marine ornamental fish is considered as a sustainable alternative, but it is still in the early stage of development. This review focuses on the current state of marine ornamental fish aquaculture, by covering topics on reef fish reproductive biology in captivity, traditional and novel live feeds, feeding regimes and visual environment in larviculture. Where possible, major differences between demersal and pelagic spawners are compared and discussed. Overall, for many ornamental fish species, natural spawning can be achieved in a captive environment without the use of hormone induction; however, sex identification and successful pairing for reef fish species could be a challenge. With the use of both traditional (rotifers and Artemia) and novel live feeds (e.g. marine copepods and ciliates), a range of breakthroughs in larval rearing of both demersal and pelagic spawning ornamental fish species have been achieved in recent years, although larval survival varies. To further improve the larval rearing success of marine ornamental fish, this review suggests that future research should focus on optimizing the use of live feed in terms of both quality and quantity, and establishment of well‐defined species‐specific larval feeding regime, as well as providing appropriate rearing condition through improved manipulation of light conditions and the 'greenwater' techniques in larval rearing