scholarly journals Trends in Indices for Extremes in Daily Precipitation over Idaho - USA (Tendências nos Índices Extremos de Precipitação Diária sobre Idaho - USA)

2012 ◽  
Vol 5 (4) ◽  
pp. 852 ◽  
Author(s):  
Carlos Antonio Costa dos Santos ◽  
Leydson Galvincio Dantas ◽  
Maria M. M. S. Melo ◽  
Elder G. dos Santos
Keyword(s):  
Global Warming ◽  
Environmental Impact ◽  
Spatial Variability ◽  
Daily Precipitation ◽  
High Quality ◽  
The Past ◽  
Precipitation Indices ◽  
Extreme Indices

The objective of this study was to analyze the trends in seven annual extreme indices of precipitation for Idaho, USA. The analyses were conducted for 35 meteorological stations, during the period from 1970 to 2006, a high quality and a fairly long-term dataset. The analyses of precipitation indices presented large spatial variability and few statistically significant trends. Thus it is not possible to conclude that significant changes in precipitation have occurred in this region during the past few decades.Keywords:Climate change, global warming, environmental impact Tendências nos Índices Extremos de Precipitação Diária sobre Idaho - USA  RESUMO O objetivo deste estudo foi analisar as tendências em sete índices anuais extremos de precipitação para Idaho, EUA. As análises foram conduzidas para 35 estações meteorológicas, durante o período de 1970 a 2006, com dados de alta qualidade e longo prazo. As análises dos índices de precipitação apresentaram alta variabilidade espacial e poucas tendências estatisticamente significativas. Logo, não é possível concluir que ocorreram mudanças significativas na precipitação nesta região durante as últimas décadas. Palavras - chave: Mudanças climáticas, aquecimento global, impacto ambiental

scholarly journals Trend in Extreme Precipitation Indices Based on Long Term In Situ Precipitation Records over Pakistan

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 797 ◽  
Author(s):  
Asher Samuel Bhatti ◽  
Guojie Wang ◽  
Waheed Ullah ◽  
Safi Ullah ◽  
Daniel Fiifi Tawia Hagan ◽  
...  
Keyword(s):  
Extreme Precipitation ◽  
Temporal Trend ◽  
Daily Precipitation ◽  
Heavy Precipitation ◽  
Precipitation Extremes ◽  
Study Region ◽  
Extreme Precipitation Indices ◽  
Precipitation Indices ◽  
Extreme Indices

Assessing the long-term precipitation changes is of utmost importance for understanding the impact of climate change. This study investigated the variability of extreme precipitation events over Pakistan on the basis of daily precipitation data from 51 weather stations from 1980-2016. The non-parametric Mann–Kendall, Sen’s slope estimator, least squares method, and two-tailed simple t-test methods were used to assess the trend in eight precipitation extreme indices. These indices were wet days (R1 ≥1 mm), heavy precipitation days (R10 ≥ 10 mm), very heavy precipitation days (R20 ≥ 20 mm), severe precipitation (R50 ≥ 50 mm), very wet days (R95p) defining daily precipitation ≥ 95 percentile, extremely wet days (R99p) defining daily precipitation ≥ 99 percentile, annual total precipitation in wet days (PRCPTOT), and mean precipitation amount on wet days as simple daily intensity index (SDII). The study is unique in terms of using high stations’ density, extended temporal coverage, advanced statistical techniques, and additional extreme indices. Furthermore, this study is the first of its kind to detect abrupt changes in the temporal trend of precipitation extremes over Pakistan. The results showed that the spatial distribution of trends in different precipitation extreme indices over the study region increased as a whole; however, the monsoon and westerlies humid regions experienced a decreasing trend of extreme precipitation indices during the study period. The results of the sequential Mann–Kendall (SqMK) test showed that all precipitation extremes exhibited abrupt dynamic changes in temporal trend during the study period; however, the most frequent mutation points with increasing tendency were observed during 2011 and onward. The results further illustrated that the linear trend of all extreme indices showed an increasing tendency from 1980- 2016. Similarly, for elevation, most of the precipitation extremes showed an inverse relationship, suggesting a decrease of precipitation along the latitudinal extent of the country. The spatiotemporal variations in precipitation extremes give a possible indication of the ongoing phenomena of climate change and variability that modified the precipitation regime of Pakistan. On the basis of the current findings, the study recommends that future studies focus on underlying physical and natural drivers of precipitation variability over the study region.

Towards high-quality net-zero targets

2021 ◽  
Author(s):  
Joeri Rogelj ◽  
Andy Reisinger ◽  
Annette Cowie ◽  
Oliver Geden
Keyword(s):  
Global Warming ◽  
Greenhouse Gas ◽  
Paris Agreement ◽  
Emissions Reduction ◽  
Special Report ◽  
High Quality ◽  
Net Zero ◽  
The World ◽  
Global Goal

<p>With the adoption of the Paris Agreement in 2015 the world has decided that warming should be kept well below 2°C while pursuing a limit of 1.5°C above preindustrial levels. The Paris Agreement also sets a net emissions reduction goal: in the second half of the century, the balance of global anthropogenic greenhouse gas emissions and removals should become net zero. Since 2018, in response to the publication of the IPCC Special Report on Global Warming of 1.5°C, a flurry of net zero target announcements has ensued. Many countries, cities, regions, companies, or other organisations have come forward with targets to reach net zero, or become carbon or climate neutral. These labels describe a wide variety of targets, and rarely detailed. Lack of transparency renders it impossible to understand their ultimate contribution towards the global goal. Here we present a set of key criteria that high-quality net zero targets should address. These nine criteria cover emissions, removals, timing, fairness and a long-term vision. Unless net zero targets provide clarity on these nine criteria, we may not know until it is too late whether the collective promise of net zero targets is adequate to meet the global goal of the Paris Agreement.</p>

scholarly journals Flow Batteries - Storing Energy on the Grid

2016 ◽  
Vol 9 (1) ◽  
Author(s):  
V.K. Gattu
Keyword(s):  
Carbon Sequestration ◽  
Environmental Impact ◽  
Driving Force ◽  
Clean Energy ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
The Past ◽  
Current Trends ◽  
Flow Batteries

The demand for electricity produced from renewable sources, such as wind and solar has considerably increased in the past decade, largely owing to the need for clean energy with no environmental impact and carbon sequestration. The energy generated from intermittent sources: wind and solar is dependent upon various climatic and geographical conditions, serves as the driving force for storing energy on grid in suitable energy packing systems to be utilized at peak hours. Consequently, the capacity to store vast amounts of energy is rising. Flow batteries have gained significant importance during the recent years owing to the performance and ability to store vast amounts of energy. This paper reviews popular types of flow batteries, current trends, and future measures to optimize the performance for long-term durability of these flow based energy storage devices.

scholarly journals Changes in Observed Daily Precipitation over Global Land Areas since 1950

2021 ◽  
Vol 34 (1) ◽  
pp. 3-19
Author(s):  
Steefan Contractor ◽  
Markus G. Donat ◽  
Lisa V. Alexander
Keyword(s):  
Daily Precipitation ◽  
The United States ◽  
Climatic Changes ◽  
High Quality ◽  
Precipitation Frequency ◽  
Uncertainty Estimates ◽  
Global Land ◽  
Intensity Changes ◽  
Entire Distribution

AbstractEstimates of observed long-term changes in daily precipitation globally have been limited due to availability of high-quality observations. In this study, a new gridded dataset of daily precipitation, called Rainfall Estimates on a Gridded Network (REGEN) V1–2019, was used to perform an assessment of the climatic changes in precipitation at each global land location (except Antarctica). This study investigates changes in the number of wet days (≥1 mm) and the entire distribution of daily wet- and all-day records, in addition to trends in annual and seasonal totals from daily records, between 1950 and 2016. The main finding of this study is that precipitation has intensified across a majority of land areas globally throughout the wet-day distribution. This means that when it rains, light, moderate, or heavy wet-day precipitation has become more intense across most of the globe. Widespread increases in the frequency of wet days are observed across Asia and the United States, and widespread increases in the precipitation intensity are observed across Europe and Australia. Based on a comparison of spatial pattern of changes in frequency, intensity, and the distribution of daily totals, we propose that changes in light and moderate precipitation are characterized by changes in precipitation frequency, whereas changes in extreme precipitation are primarily characterized by intensity changes. Based on the uncertainty estimates from REGEN, this study highlights all results in the context of grids with high-quality observations.

scholarly journals Effects of Temperature Variability and Warming on the Timing of Snowmelt Events in Southern Finland during the Past 100 Years

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Masoud Irannezhad
Keyword(s):  
Arctic Oscillation ◽  
Daily Precipitation ◽  
Meteorological Station ◽  
The Arctic ◽  
Temperature Index ◽  
The Past ◽  
Hydrological Variable ◽  
Effects Of Temperature ◽  
The Arctic Oscillation

This study analyses the first and last days of snowmelt events and the number of days (duration) between those throughout a water year (September-August). The snowmelt duration (SD) as well as its first (SFD) and last (SLD) days were estimated using daily precipitation and temperature measurements at the Kaisaniemi meteorological station in southern Finland during 1909-2008 as input datasets to a temperature-index snowmelt model. As snowmelt is a sensitive hydrological variable to temperature, this study also evaluated historical variations and trends in November-May (SDt), November-January (SFDt), and March-May (SLDt) temperatures corresponding to SD, SFD, and SLD at Kaisaniemi. The trends in all these parameters as well as their correlations with the well-known climate teleconnections over Finland were investigated. Long-term average values indicated the longest SD was about 131 days between 15 December and 25 April at Kaisaniemi. The SD significantly (p<0.05) shortened by 0.37 (days/year) at Kaisaniemi during 1909-2008 mainly due to the earlier (0.32 days/year) SLD. Such trends in SD and SLD were principally associated with century-long significant warming trends (0.02 °C/year) in both SDt and SLDt. The Arctic Oscillation (AO) was the most influential climate teleconnection for historical variations in SD, SLD, SDt, SFDt, and SLDt at Kaisaniemi.

Technical Fixes, Technological Solutions

1997 ◽  
Author(s):  
Robert Pool
Keyword(s):  
Water Pollution ◽  
Global Warming ◽  
Hazardous Wastes ◽  
Technological Disaster ◽  
The Public ◽  
The Past ◽  
The World ◽  
Underlying Theme

The past couple of decades have been a confusing, frustrating period for engineers. With their creations making the world an ever richer, healthier, more comfortable place, it should have been a time of triumph and congratulation for them. Instead, it has been an era of discontent. Even as people have come to rely on technology more and more, they have liked it less. They distrust the machines that are supposedly their servants. Sometimes they fear them. And they worry about the sort of world they are leaving to their children. Engineers, too, have begun to wonder if something is wrong. It is not simply that the public doesn’t love them. They can live with that. But some of the long-term costs of technology have been higher than anyone expected: air and water pollution, hazardous wastes, the threat to the Earth’s ozone layer, the possibility of global warming. And the drumbeat of sudden technological disaster over the past twenty years is enough to give anyone pause: Three Mile Island, Bhopal, the Challenger, Chernobyl, the Exxon Valdez, the downing of a commercial airliner by a missile from the U.S.S. Vincennes. Is it time to rethink our approach to technology? Some engineers believe that it is. In one specialty after another, a few prophets have emerged who argue for doing things in a fundamentally new way. And surprisingly, although these visionaries have focused on problems and concerns unique to their own particular areas of engineering, a single underlying theme appears in their messages again and again: Engineers should pay more attention to the larger world in which their devices will function, and they should consciously take that world into account in their designs. Although this may sound like a simple, even a self-evident, bit of advice, it is actually quite a revolutionary one for engineering. Traditionally, engineers have aimed at perfecting their machines as machines. This can be seen in the traditional measures of machines: how fast they are, how much they can produce, the quality of their output, how easy they are to use, how much they cost, how long they last.

scholarly journals Trends in indices for extremes in daily air temperature over Utah, USA

2011 ◽  
Vol 26 (1) ◽  
pp. 19-28 ◽  
Author(s):  
Carlos Antonio Costa dos Santos
Keyword(s):  
Climate Change ◽  
Air Temperature ◽  
Quality Data ◽  
High Quality ◽  
High Quality Data ◽  
Ongoing Research ◽  
United State ◽  
The World ◽  
Extreme Indices

The main objective of this study was to obtain analysis of the trends in eleven annual extreme indices of temperature for Utah, United State of America (USA). The analyses have been obtained for 28 meteorological stations, in general, for the period of 1930 to 2006, characterizing a long-term period and with high quality data. The software used to process the data was the RClimdex 1.0. The analysis has identified that the temperature increased in Utah during the last century, evidencing the importance of the ongoing research on climate change in many parts of the world.

scholarly journals Developing high-quality human resources in quang ngai province (Viet Nam) currently

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Nguyen Thi Quyet
Keyword(s):  
Human Resources ◽  
Industrial Clusters ◽  
Modern Technology ◽  
Oil Refinery ◽  
Highly Qualified ◽  
High Quality ◽  
The Past ◽  
Economic Zone ◽  
Day By Day

Currently, developing the high-quality human resources to meet the socio-economic development requirements of Vietnam in general and Quang Ngai province in particular is a very urgent need, is a very urgent need. This is a both fundamental and long-term issue  in order to realize the strong and happy national aspirations. Located in the central key economic region with Dung Quat economic zone whose core is Dung Quat oil refinery, Quang Ngai is developing day by day. Presently, Dung Quat economic zone together with industrial clusters of the province have been creating a huge value of industrial output, especially heavy industry - an important spearhead industry in the process of industrialization, modernization, creating momentum to promote the development of industry and service in the whole region, and play an important role in creating the driving force for the development of the central region. Due to the specific requirements of industries with modern technology, Quang Ngai is required to have highly qualified and skilled human resources. Being well aware of this, Quang Ngai province has paid great attention to the development of high-quality human resources and initially achieved certain achievements over the past time.

scholarly journals Long-term changes in precipitation phase in Czechia

Geografie ◽  
2019 ◽  
Vol 124 (1) ◽  
pp. 41-55
Author(s):  
Martin Hynčica ◽  
Radan Huth
Keyword(s):  
Air Temperature ◽  
Daily Precipitation ◽  
Sharp Decrease ◽  
Total Precipitation ◽  
Solid Precipitation ◽  
The Past ◽  
Air Temperatures ◽  
Long Term Changes ◽  
Precipitation Phase

Long-term changes in precipitation phase are investigated at ten stations in Czechia. Trends are calculated from 1983 to 2018 for the period between November and April. Daily SYNOP reports and daily precipitation totals are used at every station, where number and occurrence of specific codes in SYNOP report determine daily precipitation totals as solid, combined (which represents, to a large extent, category of mixed precipitation), or liquid. Thereafter, it is possible to calculate trends of all precipitation phases as well as the proportion of solid to total precipitation (S/P; in %). The average S/P trend over all Czech stations is significantly negative (−0.60%·year-1) and accompanied by a sharp decrease in solid precipitation (−1.66 mm·year-1) and an increase in combined precipitation (1.50 mm·year-1). Thus, our results show a ship of precipitation phase from solid to combined. Because of the dependence of S/P on air temperature, we suppose that the current S/P decline is a manifestation of rising air temperatures in the past decades.

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