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A weathering hypothesis for glaciation at high atmospheric pCO2 during the Late Ordovician
New paired carbonate and organic-carbon isotope analyses from Nevada, USA, together with a consideration of the effects of mountain-building and ice-sheet coverage of the continents on atmosphericExpand
Permian Phytogeographic Patterns and Climate Data/Model Comparisons
The most recent global “icehouse‐hothouse” climate transition in earth history began during the Permian. Warmer polar conditions, relative to today, then persisted through the Mesozoic and into theExpand
Simulations of Permian Climate and Comparisons with Climate‐Sensitive Sediments
We use a climate model to simulate two intervals of Permian climate: the Sakmarian (ca. 280 Ma), at the end of the major Permo‐Carboniferous glaciation, and the Wordian (ca. 265 Ma). We explore theExpand
Ecosystem-based fisheries management requires a change to the selective fishing philosophy
It is argued here that a “balanced exploitation” approach might alleviate many of the ecological effects of fishing by avoiding intensive removal of particular components of the ecosystem, while still supporting sustainable fisheries. Expand
Maintenance of Near-Surface Stratification in Doubtful Sound, a New Zealand Fjord
Abstract The surface waters of Doubtful Sound, a glacially carved fjord in south-western New Zealand, feature a quasi-permanent low-salinity-layer (LSL). The LSL is maintained year round by theExpand
Sustainability performance indicators for suspended bivalve aquaculture activities
Abstract Investigations into interactions between suspended bivalve farms and the marine environment generally focus on effects to the seafloor beneath farms. This is appropriate in situations whereExpand
Global chemical erosion during the Last Glacial Maximum and the present: Sensitivity to changes in lithology and hydrology
Geographically based calculations for 18,000 years ago (18 ka) and today were made to examine the potential effects on terrestrial chemical erosion of changes in lithology and hydrology onExpand
Aspects of the structure and variability of the low‐salinity‐layer in Doubtful Sound, a New Zealand fiord
Analysis of data from moored quantum PAR sensors revealed the important influence of the LSL on the subsurface light field and hourly salinity and temperature data acquired from four sites within Doubtful Sound show that the major source of variability in the L SL lies in the weather bands although the surface temperatures also exhibited a seasonal component. Expand
Global chemical erosion over the last 250 MY: Variations due to changes in paleogeography, paleoclimate, and paleogeology
We utilize predictions of runoff from two series of GENESIS (version 1.02) climate model experiments to calculate chemical erosion rates for 12 time slices that span the Mesozoic and Cenozoic. A setExpand
Permian climates: Evaluating model predictions using global paleobotanical data
The most recent global icehouse‐hothouse climate transition in Earth history occurred in the Permian. Warmer polar conditions relative to today existed from the middle Permian through the MesozoicExpand