نتایج جستجو برای: 2001 droughts

تعداد نتایج: 124280  

2017
Scott A. Mensing Larry Benson Michaele Kashgarian Steve Lund Larry V. Benson

Pollen and algae microfossils preserved in sediments from Pyramid Lake, Nevada, provide evidence for periods of persistent drought during the Holocene age. We analyzed one hundred nineteen 1-cm-thick samples for pollen and algae from a set of cores that span the past 7630 years. The early middle Holocene, 7600 to 6300 cal yr B.P., was found to be the driest period, although it included one shor...

2014
Jianhua Wang Dong Jiang Yaohuan Huang Hao Wang

The Haihe river basin (HRB) in the North China has been experiencing prolonged, severe droughts in recent years that are accompanied by precipitation deficits and vegetation wilting. This paper analyzed the water deficits related to spatiotemporal variability of three variables of the gravity recovery and climate experiment (GRACE) derived terrestrial water storage (TWS) data, precipitation, an...

Journal: :Environmental Earth Sciences 2022

Drought is a hidden natural hazard that involves complex climatic systems and has significant environmental social consequences. Due to the current state of catastrophic occurrences, there been an increased interest in monitoring droughts recent years. This study conducted meteorological drought analysis for five stations Great Man-Made River region located Libya. The Standardized Precipitation...

Journal: :جغرافیا و مخاطرات محیطی 0
محمود خسروی اکبر زهرایی حسین حیدری سارا بنی نعیمه

introduction drought is a climatic hazard that occurs in the vast areas throughout the world. it causes physical suffering, economic losses, and environmental instability. drought is a slowly developing very which is phenomenon, and it is very difficult to determine when a dry spell becomes a drought or when a severe drought becomes an exceptional drought. it is usually starting with less drama...

Journal: :Synthese 1999
Mark A. Changizi

Vagueness is not undecidability, but undecidability does enter into an explanation of why there is vagueness. My theory, called the Undecidability Theory of Vagueness, explains vagueness largely as a result of the fact that we are computationally bound.1 Vagueness is not due to any particularly human weakness, but due to a weakness that any computationally bound agent possesses; even HAL from 2...

2016
Glenn Shafer

When measured over decades in countries that have been relatively stable, returns from stocks have been substantially better than returns from bonds. This is often attributed to investors’ risk aversion: stocks are thought to be riskier than bonds, and so investors will pay less for an expected return from stocks than for the same expected return from bonds. The game-theoretic probability-free ...

2013
Richa Ojha D. Nagesh Kumar R. Mehrotra

General circulation models (GCMs) are routinely used to simulate future climatic conditions. However, rainfall outputs from GCMs are highly uncertain in preserving temporal correlations, frequencies, and intensity distributions, which limits their direct application for downscaling and hydrological modeling studies. To address these limitations, raw outputs of GCMs or regional climate models ar...

2017
Terence Epule Epule James D. Ford Shuaib Lwasa Laurent Lepage Athanasios Loukas

Climate projections in Sub-Saharan Africa (SSA) forecast an increase in the intensity and frequency of droughts with implications for maize production. While studies have examined how maize might be affected at the continental level, there have been few national or sub-national studies of vulnerability. We develop a vulnerability index that combines sensitivity, exposure and adaptive capacity a...

2014
Korbinian P. Freier Manfred Finckh Uwe A. Schneider

In a modeling study we examine vulnerability of income from mobile (transhumant) pastoralism and sedentary pastoralism to reduced mean annual precipitation (MAP) and droughts. The study is based on empirical data of a 3410 km research region in southern, semi-arid Morocco. The land use decision model integrates a meta-model of the Environmental Policy Integrated Climate (EPIC) simulator to depi...

Journal: :Trends in ecology & evolution 2004
David A Lytle N Leroy Poff

Floods and droughts are important features of most running water ecosystems, but the alteration of natural flow regimes by recent human activities, such as dam building, raises questions related to both evolution and conservation. Among organisms inhabiting running waters, what adaptations exist for surviving floods and droughts? How will the alteration of the frequency, timing and duration of ...

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