Dehydration in the northern hemisphere mid-latitude tropopause region observed during STREAM 1998     

FARAHNAZ KHOSRAWI  ROLF MÜLLER  JÜRGEN BEUERMANN  PAUL KONOPKA  CORNELIUS SCHILLER 《Tellus. Series B, Chemical and physical meteorology》2006,58(3):206-217

  相似文献   

ENHANCING THE DECONVOLUTION OF NOISY CHROMATOGRAPHIC DATA BY JANSSON''S METHOD     

PAUL BENJAMIN CRILLY Department of Electrical  Computer Engineering  Knoxville  TN -  U.S.A. 《地理学报(英文版)》1990,(1)

In previous papers Jansson's method was found to be successful at deconvolving severely overlapped gaschromatographic peaks.In the most recent paper the method was evaluated with respect to quantitativeaceuracy,peak area and retention time repeatability.The problems associated with deconvolving noisydata and some alternatives which can improve the ability of Jansson's method to deconvolve noisy dataare discussed.These alternatives include presmoothing the data with a nine-point,third-order polynomialfilter and data reblurring.This paper will test these methods on peaks with various degrees of resolutionand signal-to-noise ratios.  相似文献   

MIXTURE ANALYSIS USING FACTOR ANALYSIS.Ⅱ:SELF-MODELING CURVE RESOLUTION     

J.CRAIG HAMILTON Shared Research Resource Laboratories  School of Medicine  East Carolina University  Greenville  NC  U.S.A.PAUL J.GEMPERLINE Department of Chemistry  East Carolina University  Greenville  NC  U.S.A. 《地理学报(英文版)》1990,(1)

One of the major applications of factor analysis in the chemical literature,self-modeling curve resolution(SMCR),is covered in this review,including a historical account of the inethods derived from Lawtonand Sylvestre's original method.Papers treating the theory or applications of SMCR are included.Qualitative and quantitative applications are described where appropriate.  相似文献   

SOUTH AFRICA: THE IMPACT OF PAST GEOGRAPHIES. A. J. Christopher     

PAUL WELLINGS 《New Zealand geographer》1987,43(1):47-48

  相似文献   

Regional differences in the effects of El Niño and La Niña on low flows and floods     

M. PAUL MOSLEY 《水文科学杂志》2013,58(2):249-267

Abstract

The response of monthly 7-day low flow, monthly instantaneous peak flow, and monthly frequency of flood events to El Niño and La Niña episodes is investigated for 18 rivers that represent a diverse range of climatic types throughout New Zealand. A significant positive or negative deviation from the long-term average was observed in over half the possible combinations of river, streamflow index, and type of ENSO episode; significant deviations were most frequent in the case of low flow, especially during La Niña episodes. Patterns of streamflow response differ widely between rivers, and the response of a given river to individual ENSO episodes is very variable. The patterns of streamflow response to ENSO are consistent to some extent with the climatic effects of ENSO already identified by meteorologists. Two core regions can be defined in which streamflow tends to respond in the same way. These are in the northeast of the North Island, and in the axial ranges of the South Island, where there are significant effects of ENSO on the frequency and duration of rain-bearing northeasterly and westerly winds respectively. The patterns of response strongly reflect topography, and the exposure of catchments to predominant air masses.  相似文献   

New lessons for technology policy and climate change: investment for innovation     

JONATHAN KÖHLER  TERRY BARKER  HAORAN PAN  PAOLO AGNOLUCCI  PAUL EKINS  TIM FOXON 《Climate Policy》2013,13(2):156-161

The direction of UK energy policy requires a renewed impetus if the goal of climate change stabilization is to be met. Cost is not the main issue: a transformation to a low-carbon energy system may be no more expensive than meeting future energy demands with fossil fuels. Institutional barriers are preventing the large-scale adoption of the necessary technologies. New institutions to promote low-carbon technologies have not yet led to investment on the necessary scale. Further changes to the operation of the UK electricity markets to create a ‘level playing field’ for small-scale and intermittent generation are necessary. UK policy can contribute to international agreements following on from the Kyoto Accord, which also need to address the institutional barriers to energy technology development and transfer.  相似文献   

Evaluation of the Holocene environmental changes of the southwest coast, India: A palaeopalynological approach     

B AJAYKUMAR  K SREEDHARAN  MAHESH MOHAN  JOBY PAUL  A P THOMAS  P K K NAIR 《Journal of Earth System Science》2012,121(4):1093-1103

The climatic variability and the influence of temperature and sea level fluctuations on the earth??s surface configuration during the Holocene are being discussed all over the world. The present study evaluates the palaeo-environmental conditions of western coast of India during this epoch through the analysis of pollen grains embedded in a carbonaceous clay formation (? 0.4?C0.6?m) found sandwiched within the palaeodeposit of sand of Meenachil River basin. The carbon dating revealed that the clay formation has an age of 5786 ± 94 ¹⁴C yr BP, while the embedded wood samples have the age varying in between 2888 ± 78 and 5780 ± 95 ¹⁴C yr BP. The overall analysis suggests that the southwestern margin of India had experienced high intensity rainfall during the earlier part of the Atlantic chronozone due to then strengthened Asiatic monsoon, while water stagnation and hydrological modifications were observed during the later part. The dominance of weeds and lesser number of tree elements suggested a drier climate during the end of the Atlantic period. Besides, the morphometric rearrangement of the Meenachil River contemporaneous to the geomorphological modifications of the southwestern coast of India shall be classified into three categories: (1) Pre-Vembanad Lake formation, (2) Contemporaneous to lake formation and (3) Post-Lake formation.  相似文献   

WEST AFRICAN ENVIRONMENTAL NARRATIVES AND DEVELOPMENT‐VOLUNTEER PRAXIS*     

WILLIAM G. MOSELEY  PAUL LARIS 《Geographical review》2008,98(1):59-81

ABSTRACT. Environmental narratives in Africa have been examined in a flurry of publications since the mid‐1990s. In this article we seek to offer insights into the role and motivations of volunteer development workers in perpetuating environmental narratives. We examine the factors that led to the questioning or nonquestioning of environment‐development discourses and their influence, if any, on the actual work undertaken by volunteers. As former development volunteers, we also explore the role that the development‐volunteer experience subsequently played in shaping our own research as academics. Our analysis is based largely on our tenure as U.S. Peace Corps volunteers in Mali from 1987 until 1989 and our later experiences as academics. We draw on our memories, interviews with former colleagues, and training materials to describe how volunteers were introduced to, and encouraged to act on, environmental problems in the West African Sudano‐Sahel. We adopt a reflexive approach to explore briefly how our experiences as volunteers influenced our research and writing as academics.  相似文献   

HOBBY RANCHING AND CHILE'S LAND‐REFORM LEGACY*     

PETER KEEPEIS  PAUL LARIS 《Geographical review》2008,98(3):372-394

ABSTRACT. Twentieth‐century land reform in Chile reflects familiar themes. The state subdivided large land monopolies, ostensibly for social justice reasons: to provide opportunities for campesinos to earn a living from agriculture. In southern Chile's Tierra del Fuego a combination of social justice, nationalism, and geopolitical concerns stimulated land reform between 1924 and 1978. The effort succeeded in creating a new material landscape oriented around smaller ranches but failed to meet its socioeconomic goals. In a scenario that resonates with reforms elsewhere in Latin America, an elitist cultural landscape dominated by large‐holding corporations was replaced with another elitist landscape, though in a different form. Politically well‐connected and essentially absentee landholders acquired subdivided land and began to practice “hobby ranching.” The history of land reform in Tierra del Fuego demonstrates how new socioeconomic conditions created over the course of many decades have left their imprint on land use and the biophysical landscape. It also contributes to larger regional debates about the role of land degradation in stocking‐rate decline.  相似文献   

GEOGRAPHIES OF THE HOLOCAUST     

WAITMAN BEORN  TIM COLE  SIMONE GIGLIOTTI  ALBERTO GIORDANO  ANNA HOLIAN  PAUL B. JASKOT  ANNE KELLY KNOWLES  MARC MASUROVSKY  ERIK B. STEINER 《Geographical review》2009,99(4):563-574

  相似文献