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"Smith, K"
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Vertical eddy iron fluxes support primary production in the open Southern Ocean
The primary productivity of the Southern Ocean ecosystem is limited by iron availability. Away from benthic and aeolian sources, iron reaches phytoplankton primarily when iron-rich subsurface waters enter the euphotic zone. Here, eddy-resolving physical/biogeochemical simulations of a seasonally-forced, open-Southern-Ocean ecosystem reveal that mesoscale and submesoscale isopycnal stirring effects a cross-mixed-layer-base transport of iron that sustains primary productivity. The eddy-driven iron supply and consequently productivity increase with model resolution. We show the eddy flux can be represented by specific well-tuned eddy parametrizations. Since eddy mixing rates are sensitive to wind forcing and large-scale hydrographic changes, these findings suggest a new mechanism for modulating the Southern Ocean biological pump on climate timescales.
The Southern Ocean is an important sink of carbon via the biological pump. Here authors run high-resolution physical/biogeochemical simulations of an open-Southern Ocean ecosystem forced with a realistic seasonal cycle and confirm that (sub)mesoscale iron transport across the mixing-layer base sustains primary productivity.
Journal Article
The role of submesoscale currents in structuring marine ecosystems
From microbes to large predators, there is increasing evidence that marine life is shaped by short-lived submesoscales currents that are difficult to observe, model, and explain theoretically. Whether and how these intense three-dimensional currents structure the productivity and diversity of marine ecosystems is a subject of active debate. Our synthesis of observations and models suggests that the shallow penetration of submesoscale vertical currents might limit their impact on productivity, though ecological interactions at the submesoscale may be important in structuring oceanic biodiversity.
Short-lived three-dimensional submesoscale currents, responsible for swirling ocean color chlorophyll filaments, have long been thought to affect productivity. Current research suggests they may not be effective in enhancing phytoplankton growth, but may have important contributions to biodiversity.
Journal Article
Ordinary light : a memoir
\"In 'Ordinary light,' Pulitzer Prize-winning poet Tracy K. Smith explores her coming-of-age and the meaning of home against a complex backdrop of race, faith, and the unbreakable bond between a mother and daughter\"--Back cover.
Book
Bowing before Dual Gods
Organizations increasingly grapple with hybridity—the combination of identities, forms, logics, or other core elements that would conventionally not go together. Drawing on in-depth longitudinal data from the first ten years of a successful social enterprise—Digital Divide Data, founded in Cambodia—we induce an empirically grounded model of sustaining hybridity over time through structured flexibility: the interaction of stable organizational features and adaptive enactment processes. We identify two stable features—paradoxical frames, involving leaders’ cognitive understandings of the two sides of a hybrid as both contradictory and interdependent, and guardrails, consisting of formal structures, leadership expertise, and stakeholder relationships associated with each side—that together facilitate ongoing adaptation in the meanings and practices of dual elements, sustaining both elements over time. Our structured flexibility model reorients research away from focusing on either stable or adaptive approaches to sustaining hybridity toward understanding their interaction, with implications for scholarship on hybridity, duality, and adaptation more broadly.
Journal Article
Observed increasing water constraint on vegetation growth over the last three decades
Despite the growing interest in predicting global and regional trends in vegetation productivity in response to a changing climate, changes in water constraint on vegetation productivity (i.e., water limitations on vegetation growth) remain poorly understood. Here we conduct a comprehensive evaluation of changes in water constraint on vegetation growth in the extratropical Northern Hemisphere between 1982 and 2015. We document a significant increase in vegetation water constraint over this period. Remarkably divergent trends were found with vegetation water deficit areas significantly expanding, and water surplus areas significantly shrinking. The increase in water constraints associated with water deficit was also consistent with a decreasing response time to water scarcity, suggesting a stronger susceptibility of vegetation to drought. We also observed shortened water surplus period for water surplus areas, suggesting a shortened exposure to water surplus associated with humid conditions. These observed changes were found to be attributable to trends in temperature, solar radiation, precipitation, and atmospheric CO
2
. Our findings highlight the need for a more explicit consideration of the influence of water constraints on regional and global vegetation under a warming climate.
Jiao et al. conducted a comprehensive evaluation of changes in water constraint on vegetation growth in the extratropical Northern Hemisphere between 1982 and 2015. They document a significant increase in vegetation water constraint over the last three decades.
Journal Article
The psychology of school bullying
\"The Psychology of Bullying provides a highly accessible overview about the nature of bullying, what is known about it, its possible effects, and what can be done about it. It focuses on bullying at school with special attention given to the development of cyberbullying, and a final chapter looks at bullying in other contexts. Illustrated with examples and case studies, it examines who bullies and who gets bullied, what is known about effective coping strategies, and what friends, peers and the school can do to help. It will be essential reading for students, teachers and parents looking for psychological insights into what bullying is\"-- Provided by publisher.
Book
Increasing impact of warm droughts on northern ecosystem productivity over recent decades
Climate extremes such as droughts and heatwaves have a large impact on terrestrial carbon uptake by reducing gross primary production (GPP). While the evidence for increasing frequency and intensity of climate extremes over the last decades is growing, potential systematic adverse shifts in GPP have not been assessed. Using observationally-constrained and process-based model data, we estimate that particularly northern midlatitude ecosystems experienced a +10.6% increase in negative GPP extremes in the period 2000–2016 compared to 1982–1998. We attribute this increase predominantly to a greater impact of warm droughts, in particular over northern temperate grasslands (+95.0% corresponding mean increase) and croplands (+84.0%), in and after the peak growing season. These results highlight the growing vulnerability of ecosystem productivity to warm droughts, implying increased adverse impacts of these climate extremes on terrestrial carbon sinks as well as a rising pressure on global food security.The authors show increased negative extremes in gross primary productivity in northern midlatitude ecosystems, particularly over grasslands and croplands, attributed to impacts of warm droughts. This highlights the vulnerability of terrestrial carbon sinks and food security to increasing extreme events.
Journal Article