Northern Hemisphere tilted toward the Sun at aphelion

Orbital variations that lead to variation in the amount of incoming solar radiation, including eccentricity, obliquity (tilt), and precession of the equinoxes the past two million years alone, Earth has seen the ice sheets advance and retreat approximately 20 times. The climate record as deduced from ice-core records from Greenland and isotopic tracer studies from deep ocean, lake, and cave sediments suggests that the ice builds up gradually over periods of about 100,000 years, then retreats...

IS there a drought iN Las Vegas

Island Heightmap

Much of the desert Southwest region of the United States was settled in the past century following a century of historically high rainfall. Towns and cities grew, and the Bureau of Land Management diverted water from melting snows, rivers, and underground aquifers to meet the needs of growing cities. Some of the country's largest and newest cities, including Phoenix, Tucson, Denver, Las Vegas, Los Angeles, San Diego, and Albuquerque, have grown out of the desert using water from the Colorado...

Major Volcanic Eruptions and Climate Change

Some of the larger, more explosive volcanic eruptions that the planet has witnessed in the past few hundred years have ejected large amounts of ash and finer particles called aerosols into the atmosphere and stratosphere, and it may take years for these particles to settle back down to Earth. They get distributed about the planet by high-level winds, and they have the effect of blocking out some of the Sun's rays, which lowers global temperatures. This happens because particles and aerosol...

Conclusion Of Solar Radiation

Global climate change is causing many deserts of the world to expand, exposing large populations of people to drought and famine conditions. Some of the largest deserts of the world, such as the Sahara, are expanding as the global atmospheric circulation patterns change, and hundreds of thousands of people have perished as crops have failed year after year in the sub-Saharan Sahel. The region has been plunged into civil unrest, partly resulting from drought. Areas in the Middle East have...

Examples of Expanding Deserts and Drought Disasters

Global climate change is causing many areas on the planet that were previously experiencing temperate climates to suffer drought conditions. Drought is very different from normal desert processes. A drought is a prolonged reduction in the amount of rainfall for a region. It is one of the slowest of all major natural disasters to affect people, but it is also among the most severe, causing more deaths, famine, and displacement than most other more spectacular disasters. Drought often presages...

Drought caused by changes in Global Atmospheric circulation

Drought Image Satellite Iran Map

Global oceanic and atmospheric circulation patterns undergo frequent shifts that affect large parts of the globe, particularly those arid and semiarid parts affected by Hadley Cell circulation. One of the better known variations in global circulation is known as the El Nino-Southern Oscillation. Fluctuations in global circulation can account for natural disasters, including the Dust Bowl days of the 1930s in the U.S. plains states. Similar global climate...

Thermohaline circulation and climate

Variations in formation and circulation of ocean water may cause some of the thousands of years to decadal scale variations in climate. Cold water forms in the Arctic and Weddell Seas. This cold salty water is denser than other water in the ocean, so it sinks to the bottom and gets ponded behind seafloor topographic ridges, periodically spilling over into other parts of the oceans. The formation and redistribution of North Atlantic cold bottom water accounts for about 30 percent of the solar...