Future seagrass beds: Can increased productivity lead to increased carbon storage?     

Bayden D. Russell  Sean D. Connell  Sven Uthicke  Nancy Muehllehner  Katharina E. Fabricius  Jason M. Hall-Spencer 《Marine pollution bulletin》2013

While carbon capture and storage (CCS) is increasingly recognised as technologically possible, recent evidence from deep-sea CCS activities suggests that leakage from reservoirs may result in highly CO₂ impacted biological communities. In contrast, shallow marine waters have higher primary productivity which may partially mitigate this leakage. We used natural CO₂ seeps in shallow marine waters to assess if increased benthic primary productivity could capture and store CO₂ leakage in areas targeted for CCS. We found that the productivity of seagrass communities (in situ, using natural CO₂ seeps) and two individual species (ex situ, Cymodocea serrulata and Halophila ovalis) increased with CO₂ concentration, but only species with dense belowground biomass increased in abundance (e.g. C. serrulata). Importantly, the ratio of below:above ground biomass of seagrass communities increased fivefold, making seagrass good candidates to partially mitigate CO₂ leakage from sub-seabed reservoirs, since they form carbon sinks that can be buried for millennia.  相似文献   

A multi-perspective examination of heat waves affecting Metro Vancouver: now into the future     

Ronald E. Stewart  Daniel Betancourt  James B. Davies  Deborah Harford  Yaheli Klein  Robert Lannigan  Linda Mortsch  Erin O’Connell  Kathy Tang  Paul H. Whitfield 《Natural Hazards》2017,87(2):791-815

Using studies of places where heat waves are common, projected changes in heat waves in Metro Vancouver are assessed from a multi-disciplinary perspective with respect to the potential impacts of the physical change on the people and infrastructure with the intention of being better prepared for future events. Trends in maximum temperature parameters for Metro Vancouver for the past 75 years are generally not statistically significant; however, projections for 2041–2060 and 2081–2100 suggest that the region will experience such events more frequently in the future due to climate change. While Metro Vancouver, British Columbia (BC) generally does not typically experience heat waves it was strongly affected by a major heat event in July 2009, with temperature records being broken at Vancouver (≥31 °C) on the coast and at Abbotsford (≥36 °C) 65-km inland. A lack of sea breeze during this event meant that there was no cooling effect, and land surface temperatures over the downtown area approached 40 °C and excess deaths occurred. Many victims were either in the 65–74 age category, the vulnerable poor, or people with mental health issues. Because these events are rare, many buildings lack air-conditioning, and residents of Metro Vancouver under-anticipate their vulnerability. The costs of health-related impacts outweighed those related to higher electricity usage.  相似文献   

Coupled flow and geomechanical processes during enhanced coal seam methane recovery through CO2 sequestration     

L.D. Connell  C. Detournay 《International Journal of Coal Geology》2009,77(1-2):222-233

The sensitivity of coal permeability to the effective stress means that changes in stress as well as pore pressure within a coal seam lead to changes in permeability. In addition coal swells with gas adsorption and shrinks with desorption; these sorption strains impact on the coal stress state and thus the permeability. Therefore the consideration of gas migration in coal requires an appreciation of the coupled geomechanical behaviour. A number of approaches to representing coal permeability incorporate the geomechanical response and have found widespread use in reservoir simulation. However these approaches are based on two simplifying assumptions; uniaxial strain (i.e. zero strain in the horizontal plane) and constant vertical stress. This paper investigates the accuracy of these assumptions for reservoir simulation of enhanced coalbed methane through CO₂ sequestration. A coupled simulation approach is used where the coalbed methane simulator SIMED II is coupled with the geomechanical model FLAC3D. This model is applied to three simulation case studies assembled from information presented in the literature. Two of these are for 100% CO₂ injection, while the final example is where a flue gas (12.5% CO₂ and 87.5% N₂) is injected. It was found that the horizontal contrast in sorption strain within the coal seam caused by spatial differences in the total gas content leads to vertical stress variation. Thus the permeability calculated from the coupled simulation and that using an existing coal permeability model, the Shi–Durucan model, are significantly different; for the region in the vicinity of the production well the coupled permeability is greater than the Shi–Durucan model. In the vicinity of the injection well the permeability is less than that calculated using the Shi–Durucan model. This response is a function of the magnitude of the strain contrast within the seam and dissipates as these contrasts diminish.  相似文献   

Environmental distribution of chlorohydrocarbon contaminants associated with Sydney sewage discharges     

Munro R. Mortimer  Des W. Connell 《Marine pollution bulletin》1996,33(7-12):160-167

A steady-state nonequilibrium fugacity model incorporating the oceanographic dimensions of the environment receiving a sewage discharge from Sydney, Australia was used to predict the environmental fate of a range of chlorohydrocarbon contaminants. The model showed advection in water to be the dominant removal process, accounting for all except 1–2% of the contaminants discharged. With the exception of the more water soluble dieldrin, the major portion of contaminant present in the area was held in the sediments. Bioconcentration and sediment sorption models were used with levels detected in the biota and sediments to calculate the ambient water concentrations of the chlorohydrocarbon contaminants. The ambient water concentrations calculated using these models were in general agreement within a factor of about 2 in all but one case, and that was in agreement within an order of magnitude. The fugacity model was also used to estimate the rates of discharge of each of the contaminants. These were chlordane 83–640, DDT 150, dieldrin 1400–1500, hexachlorobenzene 360–400 and PCBs 55–96 g day⁻¹. Comparisons of the calculated ambient concentrations of each compound in the water and in fish in waters adjacent to the discharge point before and after its relocation from a cliff-face to a deepwater site indicated that relocation should result in an order of magnitude reduction.  相似文献   

Place,exile and identity: the contemporary experience of Palestinians in Sydney     

Jeremy Cox  John Connell 《The Australian geographer》2003,34(3):329-343

Statelessness, displacement and exile, far from being particular moments in history, continue to affect the lives of Palestinians living in Sydney, in the maintenance of national identity and community formation. The impacts that displacement and subsequent ‘statelessness’ have had on the ways in which Palestinians maintain a sense of national identity have similarities with those of other ‘displaced’ peoples. Without the recognition of national boundaries to secure national sovereignty (Palestine) and accommodate the continuation of a shared and inherited history, the most significant element through which Palestinian identity is kept ‘alive’ is the one thing that all Palestinians share: a communal sense of injustice which involves being denied the right to live in, or return to, their homeland. Statelessness, nationalism and the now ‘imagined community’ of Palestine are more crucial for Palestinians living in Sydney than more primordial elements of identity, such as language or local community. Statelessness and exile in Australia have constructed a particular sense of Palestinian nationalism. The continuity of Palestinian identity as a primarily political phenomenon is a situation analogous to that of other diasporic refugee communities.  相似文献   

The End Ever Nigh: Contemporary population change on Pitcairn island     

Dr. John Connell 《GeoJournal》1988,16(2):193-200

Approximately 50,000 ha of native ‘ōhi’a (Metrosideros polymorpha) rain forest on the windward side of the island of Hawaii experienced a pronounced dieback of the tree canopy during the 1960s and early 1970's. The forests affected were located between 600 and 1,500 m elevation where the median annual rainfall was greater than 25000mm. Dieback stands were found on a variety of different substrates ranging from 500–10,000 years in age. Most of the stands that experiencel dieback had canopy cover greater than 60% prior to 1960. In 1976 and 1977 we established 43 relevés in dieback and non-dieback forest stands to assess canopy tree vigor, composition and structure of the vegetation, and to describe substrate characteristics.Metrosideros population structure and tree vigor were resampled for 25 of these relevés in 1982 and 1985–1986. The results of air photo analysis and ground sampling showed that dieback has not expanded very much within the study area since 1977. However, 5 of the relevés sampled in 1977 continued to decline in tree canopy vigor between 1977 and 1982 while 2 others showed a slight recovery in vigor over this same period. Seedling and sapling regeneration has been extremely vigorous in most of the sites that experienced a breakdown of the canopy while, in stands with an intact, dense tree canopy no such regeneration occurred. It appears that most of the stands which experienced canopy dieback have the potential to become closed forest communities again, dominated byMetrosideros. The natural recovery process may be disrupted in some areas due to additional competition for light and nutrients from invading populations of both native and alien plant species that have become established following canopy dieback.  相似文献   

‘The Best Island on the Globe’: constantly constructing tourism on Niue     

John Connell 《The Australian geographer》2007,38(1):1-13

Though islands have some comparative advantages for tourism, developing a tourist industry has often been hampered by isolation, poor connections and limited marketing. Despite a series of plans and promotions, tourism in the small Polynesian island of Niue has never reached its frequently anticipated potential because of poor airline connectivity and capacity and limited local attractions. Nevertheless the permanently ‘infant industry’ plays a key role in contributing to the fiction of developing a private sector to escape from aid dependence and hint at a sustainable future. Tourism has, however, remained significantly, even increasingly, influenced by the public sector, as Niue increasingly becomes a ‘government island’.  相似文献   

Bermuda subtropical storms     

M. P. Guishard  E. A. Nelson  J. L. Evans  R. E. Hart  D. G. O’Connell 《Meteorology and Atmospheric Physics》2007,97(1-4):239-253

Summary This investigation focuses on North Atlantic subtropical cyclones which tracked within 100 nautical miles (185 km) of Bermuda from 1957 to 2005, identified through subtropical structural characteristics distinguished using Cyclone Phase Space, from the European Centre for Medium-Range Weather Forecasts 45-year reanalyses. The study assesses the characteristics of these hybrid storms that affect the Island, in order to aid the local forecaster. Reanalysis charts, surface analyses, local observations, HURDAT tracks, and satellite pictures, where available, were examined. This data shows that subtropical cyclones affecting Bermuda usually form in close proximity, to the south-southwest, over water of an average of 26 °C, under moderate vertical wind shear, with an upper trough lying to the west-north-west. They then move in a north-northeastward direction, intensifying quickly, but not often reaching a peak intensity of more than 26 m s⁻¹. They generally have their beginnings along old baroclinic zones. September is the peak month of occurrence. A direct hit by a severe subtropical cyclone, producing locally observed winds of over 26 m s⁻¹, appears to be a rare event. However, these storms are certainly a threat to the Island, particularly due to their lack of predictability, and conditions conducive to an incipient subtropical cyclone with potential to affect the Island should always be closely monitored.  相似文献   

Graeme John Hugo, 1946–2015     

John Connell 《The Australian geographer》2015,46(2):271-279

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Limited infaunal response to experimental trawling in previously untrawled areas   总被引：2，自引：2，他引：2  

Drabsch  Sharon L.; Tanner  Jason E.; Connell  Sean D. 《ICES Journal of Marine Science》2001,58(6):1261-1271

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