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Articles 1 - 12 of 12
Full-Text Articles in Physical Sciences and Mathematics
A Drought Watch System For Southeast Spain, Ramon Garrido Abenza
A Drought Watch System For Southeast Spain, Ramon Garrido Abenza
Drought Network News (1994-2001)
One of the main climatological characteristics of the region of Murcia (11,300 km2), located almost entirely in the Segura Basin (in southeast Spain), is the great temporal and spatial irregularity of its precipitation. Average annual precipitation values range between 200 and 500 mm, and coefficients of variation (CV) are high, with some values about 50%. It is a semiarid region (including a small arid area), and agriculture plays a major role in its economy. Because of this, drought is one characteristic of the region’s climate that has far-reaching consequences, from unemployment to social conflicts.
It is important to define drought …
Drought Follows The Deluge In Vermont, Lesley-Ann Dupigny-Giroux
Drought Follows The Deluge In Vermont, Lesley-Ann Dupigny-Giroux
Drought Network News (1994-2001)
The incidence of both drought and flooding on the Vermont landscape within the same calendar year is not an uncommon occurrence. The year 1998 was no exception, in that the ice storm of January and statewide flooding of June/July finally gave way to drought conditions as the year drew to a close. These dry conditions continued into late June/early July 1999, when a series of convective and frontal systems brought steady rainfall amounts that were helpful in reducing the surface moisture deficits. Hydrologic deficits, however, still existed in mid-July.
With the exception of the most severe events, which can span …
Low Temperature And Cold Drought Risks In Crop Production In Temperate Kashmir, Badrul Hasan, Ashok Kumar, A. A. Khan
Low Temperature And Cold Drought Risks In Crop Production In Temperate Kashmir, Badrul Hasan, Ashok Kumar, A. A. Khan
Drought Network News (1994-2001)
Temperature plays a vital role in life processes and crop production. Physical and chemical processes within plants are temperature dependent; these processes in turn control biological reactions in crop plants. Temperature also plays a significant role in some aspects of crop physiological cycles: the diffusion rate of gases and liquids changes with temperature; the solubility of substances is temperature dependent; rapid progress occurs as a result of temperature increases; and the equilibrium and stability of various systems and compounds (including enzymes) is a function of temperature.
Air temperature at the screen level is one of the most important variables affecting …
From The Director: May-August 1999, Donald A. Wilhite
From The Director: May-August 1999, Donald A. Wilhite
Drought Network News (1994-2001)
With increased understanding of El Niño and La Niña events and growing awareness of the wide range of potential impacts, as well as the increased reliability of seasonal climate forecasts for some regions of the world, there is growing interest in the use of climate information to help reduce risk for some weather-sensitive industries, especially agriculture. The National Drought Mitigation Center (NDMC) is currently involved in a project sponsored by the UNDP Office to Combat Desertification and Drought (UNSO) and the World Meteorological Organization, with additional support from NOAA and USAID. The next phase of this project will be a …
Announcements: August 1999
Drought Network News (1994-2001)
Contents:
Disaster Management Workshops
National Workshop on Dynamic Crop Simulation Modeling
International Conference on Integrated Drought Management
15th Annual Conference on Contaminated Soils
2000 National Disaster Medical System Conference
Enso’S Impact On The Occurrence Of Autumnal Drought In Iran, M. J. Nazemosadat
Enso’S Impact On The Occurrence Of Autumnal Drought In Iran, M. J. Nazemosadat
Drought Network News (1994-2001)
Recent extreme rainfall events and the frequent occurrence of worldwide droughts and their associated natural disasters (i.e., devastating bushfires in Australia, Indonesia, and Italy during 1997; the current severe drought in Iran) have increased the scientific community’s interest in the broad characteristics of rainfall variation and the potential for rainfall prediction.
On the basis of the Koppen climate classification (Ahrens, 1998), the Islamic Republic of Iran (Figure 1) is categorized as generally having arid (BW) and semiarid (BS) climates. This signifies that the annual precipitation is less than the potential annual loss of water through evapotranspiration. The occurrence of rainfall …
Announcements: February 1999
Drought Network News (1994-2001)
Contents:
International Symposium on High Altitude and Sensitive Ecological Environmental Geotechnology
5th International Symposium on Environmental Geotechnology and Global Sustainable Development
10th Global Warming International Conference & Expo (GW10)
New Book
Rainfall Climatology Of Jammu And Kashmir State, India, Badrul Hasan
Rainfall Climatology Of Jammu And Kashmir State, India, Badrul Hasan
Drought Network News (1994-2001)
We have written a number of articles on various aspects of weather characterization and forecast verification under temperate environments of Jammu and Kashmir (India). We have also touched on some of the approaches that might help in solving climatically triggered problems (Hasan and Kanth 1997). Fortunately, we were lucky enough to make significant progress in some (if not all) of the approaches. The present article focuses on an analysis of rainfall/ precipitation in this state of the Indian Union under different agroclimatic zones, with an update on forecast verification analysis of temperate Kashmir (India) during 1997–98.
India is classified into …
Using The Spi To Analyze Spatial And Temporal Patterns Of Drought In Turkey, Ali Umran Komuscu
Using The Spi To Analyze Spatial And Temporal Patterns Of Drought In Turkey, Ali Umran Komuscu
Drought Network News (1994-2001)
Drought is a natural phenomenon that has significant economic, social, and environmental impacts. Drought differs from other natural hazards in that its onset and end are difficult to determine. It develops slowly, and its impacts may remain for years after termination of the event. No single definition of drought exists that applies to all circumstances, but most definitions of drought are based on an expression of deficiency of precipitation resulting in water shortage for some activity related to use of water (Wilhite and Glantz, 1985; Dracup et al., 1980). Water resources planners usually rely on quantitative indices to decide whether …
Heat Waves And Floods Across Asia: Was El Niño, Then La Niña The Cause?, R. H. Kripalani, Ashwini Kulkarni
Heat Waves And Floods Across Asia: Was El Niño, Then La Niña The Cause?, R. H. Kripalani, Ashwini Kulkarni
Drought Network News (1994-2001)
Unprecedented heat wave conditions occurred during May–June 1998 across Asia. Unusually high temperatures were recorded in western India, Pakistan, eastern China, Japan, and Southeast Asia. Even the United States, western Africa, eastern Canada, and western Australia experienced the blistering heat spell.
Some reports blame people for the global warming. The world is warming because of the burning of fossil fuels and deforestation, resulting in an increase in carbon dioxide in the atmosphere. The 1998 heat wave prompted the United Nations Environment Programme to issue an urgent warning and a wakeup call to limit the emission of global warming gases. The …
Severe Droughts Becoming Recurrent, More Persistent In Mexico, Israel Velasco
Severe Droughts Becoming Recurrent, More Persistent In Mexico, Israel Velasco
Drought Network News (1994-2001)
During recent years, severe and extreme droughts in Mexico and their consequent water deficits have become more recurrent and persistent, according to historic records and the experiences of those who have lived through these events.
In Mexico, agriculture consumes more than 85% of the available water. When the available water is insufficient to satisfy agricultural requirements, impacts can be acute. In extreme cases, lack of water has caused severe economic, social, and environmental crises, and recovery from these crises has taken much time and money.
The regions that are most affected by drought have some common characteristics: they are the …
From The Director: February 1999, Donald A. Wilhite
From The Director: February 1999, Donald A. Wilhite
Drought Network News (1994-2001)
Many of the readers of Drought Network News are familiar with the “hydro-illogical cycle” cartoon that I use frequently in presentations and publications. This illustration has been translated into many languages and serves as a constant reminder of the crisis management mentality often displayed in responding to drought emergencies and the proverbial “window of opportunity” following a drought when planning for the next event is of high priority. I hear comments routinely from government officials that recognize the need to plan, but they express hesitancy in moving forward now if water supply conditions are normal or above. The concern is …