A Comparison of Fuzzy AHP and Ideal Point Methods for Evaluating Land Suitability   总被引：2，自引：0，他引：2  

Mukhtar Elaalem  Alexis Comber  Pete Fisher 《Transactions in GIS》2011,15(3):329-346

This article compares two fuzzy approaches to land suitability evaluations, Analytical Hierarchy Process (AHP) and Ideal Point. The methods were evaluated using a case study which models the opportunities for wheat production under irrigation conditions in the north‐western region of Jeffara Plain, Libya. A number of relevant soil and landscape criteria were identified through a review of the literature and their weights specified as a result of discussions with local experts. The results of the Fuzzy AHP showed that the majority of the study area has membership values to the set of suitability between 0.40 and 0.50, while the results of the Ideal Point approach revealed most of the study area to have membership values between 0.30 and 0.40. While the Fuzzy AHP and Ideal Point approaches accommodate the continuous nature of many soil properties and produce more intuitive distributions of land suitabilities values, the Fuzzy AHP approach was found to be better than Fuzzy Ideal Point. This was due to the latter's tendency to be biased towards positive and negative ideal values.  相似文献   

The δ18O stratigraphy of the Hoxnian lacustrine sequence at Marks Tey,Essex, UK: implications for the climatic structure of MIS 11 in Britain          下载免费PDF全文

G. J. Tye  J. Sherriff  I. Candy  P. Coxon  A. Palmer  E. L. McClymont  D. C. Schreve 《第四纪科学杂志》2016,31(2):75-92

Marine Isotope Stage 11 (MIS 11) is considered one of the best analogues for the Holocene. In the UK the long lacustrine sequence at Marks Tey, Essex, spans the entirety of the Hoxnian interglacial, the British correlative of MIS 11c. We present multiproxy evidence from a new 18.5‐m core from this sequence. Lithostratigraphy, pollen stratigraphy and biomarker evidence indicate that these sediments span the pre‐, early and late temperate intervals of this interglacial as well as cold climate sediments that post‐date the Hoxnian. The δ¹⁸O signal of endogenic carbonate from this sequence produces several clear patterns that are interpreted as reflecting the climatic structure of the interglacial. As well as providing evidence for long‐term climate stability during the interglacial and a major post‐Hoxnian stadial/interstadial oscillation the δ¹⁸O signal provides strong evidence for abrupt cooling events during the interglacial itself. One of these isotopic events occurs in association with a short‐lived increase in non‐arboreal pollen (the NAP phase). The results presented here are discussed in the context of other MIS 11 records from Europe and the North Atlantic, particularly with respect to our understanding of the occurrence of abrupt climatic events in pre‐Holocene interglacials. Copyright © 2016 The Authors. Journal of Quaternary Science Published by John Wiley & Sons Ltd.  相似文献   

Natural Climate Solutions for China:The Last Mile to Carbon Neutrality     

Zhangcai QIN  Xi DENG  Bronson GRISCOM  Yao HUANG  Tingting LI  Pete SMITH  Wenping YUAN  Wen ZHANG 《大气科学进展》2021,38(6):889-895

正"I call on all leaders worldwide to declare a State of Climate Emergency in their own countries until carbon neutrality is reached."–António GUTERRES(United Nations Secretary General), 12 December, 2020 There is no shortcut to a carbon neutral society; solutions are urgently required from both energy industrial sectors and global ecosystems.  相似文献   

Compositional variations of zirconolite from the Evate apatite deposit (Mozambique) as an indicator of magmatic-hydrothermal conditions during post-orogenic collapse of Gondwana     

Hurai  Vratislav  Huraiová  Monika  Gajdošová  Michaela  Konečný  Patrik  Slobodník  Marek  Siegfried  Pete R. 《Mineralogy and Petrology》2018,112(3):279-296

Mineralogy and Petrology - Zirconolite is documented from the Evate apatite-magnetite-carbonate deposit in the circular Monapo Klippe (eastern Mozambique)—a relic of Neoproterozoic nappe...  相似文献   

A tephra-based correlation of marine and terrestrial records of MIS 11c from Britain and the North Atlantic     

Ian Candy  Gareth Tye  Peter Coxon  Mark Hardiman  Ian Matthews  Adrian Palmer 《第四纪科学杂志》2021,36(7):1149-1161

Resolving marine and terrestrial records of glacial and interglacial stages has long been a challenge for Quaternary studies. We present a tephra-based correlation for MIS 11c of a North Atlantic marine core and a British terrestrial record (Marks Tey). A varved chronology is presented for the annually laminated lake sequence at Marks Tey and the proxy data from this site are plotted on an annual timescale for the first time. This record shows clear evidence for an abrupt cold event and corresponding ecological and landscape response. Varve counting shows that the abrupt event lasted for ca 185 a but the impact on the landscape persisted for ca 560 a. The co-occurrence of a single tephra layer in Marks Tey and ODP 980 allows these two records to be correlated. Furthermore, this synchronisation shows that the abrupt cold event in Marks Tey was coincident with a centennial-scale cold event in ODP 980, as evidenced by an increase in Neogloboquadrina pachyderma (s) percentage. In both ODP 980 and Marks Tey the age of this abrupt event was ca 414 500 a indicating that, at this point in MIS 11c, a widespread cold event occurred in the northeastern Atlantic and the British Isles.  相似文献   

Relative vulnerability of the forests along southeastern African coasts to cyclones     

Pete Bettinger  Krista L. Merry 《Singapore journal of tropical geography》2012,33(3):320-334

The forests of southeastern Africa are vulnerable to damage imposed by tropical cyclones operating in the South Indian Ocean. We undertook a geographical analysis to determine the relative vulnerability of forests given tropical cyclones recorded during the 1959–2008 storm seasons. From this analysis, eastern coastal forests of Madagascar seem to be the most vulnerable, although return intervals for severe storms vary along the eastern coast, and are shorter (about 10 years) through the central portion of the country. Therefore, the central lowland to upper montane rainforests on the eastern coast seem to be more vulnerable to damage from tropical cyclones than others in the area. While not as extensive, western coastal forests of Madagascar are also as vulnerable in part due to the recurvature of storms in the Mozambique Channel. Though the coastal forests of Mozambique are all nearly equal in terms of vulnerability, the return interval for severe storms to this area is highly variable. The inland Miombo forests of southeast Africa are less vulnerable to damage from tropical cyclones; however, portions of western Mozambique and Zimbabwe have experienced strong tropical storms in the last 50 years. A number of caveats and limitations associated with the data and analyses are noted. Given the broad scale of the study, the relative vulnerability and the return intervals for severe storms should be considered general representations of these phenomena for the southeastern African coast and the island of Madagascar.  相似文献   

Sectoral approaches to improve regional carbon budgets     

Pete Smith  Gert-Jan Nabuurs  Ivan A. Janssens  Stefan Reis  Gregg Marland  Jean-François Soussana  Torben R. Christensen  Linda Heath  Mike Apps  Vlady Alexeyev  Jingyun Fang  Jean-Pierre Gattuso  Juan Pablo Guerschman  Yao Huang  Esteban Jobbagy  Daniel Murdiyarso  Jian Ni  Antonio Nobre  Changhui Peng  Adrian Walcroft  Shao Qiang Wang  Yude Pan  Guang Sheng Zhou 《Climatic change》2008,88(3-4):209-249

Humans utilise about 40% of the earth’s net primary production (NPP) but the products of this NPP are often managed by different sectors, with timber and forest products managed by the forestry sector and food and fibre products from croplands and grasslands managed by the agricultural sector. Other significant anthropogenic impacts on the global carbon cycle include human utilization of fossil fuels and impacts on less intensively managed systems such as peatlands, wetlands and permafrost. A great deal of knowledge, expertise and data is available within each sector. We describe the contribution of sectoral carbon budgets to our understanding of the global carbon cycle. Whilst many sectors exhibit similarities for carbon budgeting, some key differences arise due to differences in goods and services provided, ecology, management practices used, land-management personnel responsible, policies affecting land management, data types and availability, and the drivers of change. We review the methods and data sources available for assessing sectoral carbon budgets, and describe some of key data limitations and uncertainties for each sector in different regions of the world. We identify the main gaps in our knowledge/data, show that coverage is better for the developed world for most sectors, and suggest how sectoral carbon budgets could be improved in the future. Research priorities include the development of shared protocols through site networks, a move to full carbon accounting within sectors, and the assessment of full greenhouse gas budgets.  相似文献   

May the Force Be with You     

Evan K. Nyer  Gary Boettcher  Pete Jalajas 《Ground Water Monitoring & Remediation》1997,17(3):70-75

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The Search for Solar Gravity-Mode Oscillations in the Solar Wind Using it Ulysses Plasma Data     

Gary W. Hoogeveen  Pete Riley 《Solar physics》1998,179(1):167-177

A recent report that energetic particles measured in the solar wind may be influenced by solar gravity-mode ( -mode) oscillations motivated the search for -mode signatures in the Ulysses solar wind plasma data. Ulysses solar wind plasma data from 1 March 1992 through the 12 April 1996 were examined in this study for signs of possible solar oscillations. The multi-taper method for spectral analysis was used to look for significant spectral peaks in the entire four-year data set, as well as in the smaller, more heliographically homogenous data set over the solar poles. Several frequencies satisfying certain significance requirements were found in the -mode frequency range in both data sets that also agree with the previously published findings. However, these identifications are shown to be false detections, and hence the frequencies found cannot be identified as solar modes.  相似文献   

Hydrogeological aspects of bacterial contamination of some western Ireland karstic limestone aquifers     

R. H. Thorn  C. E. Coxon 《Environmental Geology》1992,20(1):65-72

The paper describes the results of a study of the relationship between the hydrogeology of some karstic aquifers and bacterial contamination. The study showed that even where the contaminant load is low the nature of the aquifers ensured that contamination was endemic. Although a close correlation between antecedent precipitation and contamination was demonstrated, it was a complex relationship and further investigation, particularly of flood pulses, would be necessary to elucidate the relationship.  相似文献