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Have you ever wondered how the SMAP satellite, with an altitude of 685 km (425 miles) above the Earth, can take measurements as precise as the amount of water in the Earth's soil? The quick answer is that it requires precisely calibrated instruments, along with a technological marvel in satellite design. SMAP was designed to use a combination of two precise instruments, one with high resolution, one with high accuracy. THE INSTRUMENTS: Active (High Resolution): SMAP’s radar was designed accurately measure the echoes of very short radio frequency (RF) pulses that bounce (“backscatter”)...

Узнать больше О How Does the SMAP Satellite Mission Take Measurements All the Way from Space? »

Posted in: Curriculum: Science and Math Technology Field Campaigns: SMAP GLOBE Science Topics: Earth System Science Investigation Areas: Pedosphere (Soil) Primary Audience: Trainers Teachers Students Partners Scientists Alumni Country Coordinators

Most trees obtain water through their massive root systems, but did you know that some trees can absorb water through their leaves as well? This ability is called foliar uptake. Scientists recently discovered that trees in cloud forests use foliar uptake to obtain water. A cloud forest is a forest that has persistent or seasonally persistent fog or low-level cloud cover. Cloud forests are usually in the tropics or subtropics, have evergreen trees (trees that don’t lose their leaves) and tend to have a lot of mosses and vegetation in the understory of the trees. Cloud Forest located...

Узнать больше О Cloud forests and how trees get water »

Posted in: GLOBE Science Topics: Earth System Science Investigation Areas: Earth As a System Biosphere

GLOBE’s Earth as a System investigation area cultivates students’ awareness of an intricate web of global connections. Similar to real world scientists, students explore life science concepts, learning that “organisms can only survive where their needs are met.”  The Earth as a System investigation area encourages students to observe patterns and connections, such as through phenology. Phenology is the study of how living organisms respond to seasonal changes in their environment. Only through observing and measuring can we notice if changes are occurring and how they occur. For...

Узнать больше О Hummingbird populations – How GLOBE students can help »

Posted in: GLOBE Science Topics: Earth System Science Investigation Areas: Earth As a System Biosphere » Ruby-Throated Hummingbirds

All over the United States, spring flowers such as daffodils and crocuses began blooming nearly a month ago due to an unseasonably warm winter.  Some of my friends from many parts of the country have been mentioning how beautiful their gardens are and enjoying the warm weather.  Even my family and friends from the Mid-Atlantic region have been sending photos showing off their beautiful home gardens. Daffodils in bloom in late February Many think it’s really nice to see green grass, budding trees, and flowers in bloom in late February, as it’s a spirit lift after a...

Узнать больше О Mild winters and early springs - trend or rarity? »

Posted in: GLOBE Science Topics: Backyard Science Climate Earth System Science

From January 22 to 26, 2012, scientists from around the world gathered for the American Meteorological Society annual meeting, which was held in New Orleans, Louisiana.  Scientists from the GLOBE Program stayed next to the beautiful Mississippi River. The Mississippi River in New Orleans (photo courtesy of Dr. Donna Charlevoix) The Mississippi River is the lifeblood of New Orleans and has so impacted the city that the city was actually developed around it. The first buildings were constructed around the river edge, which has the highest ground, and now gives the city a...

Узнать больше О The Mississippi River and Aquatic Dead Zones »

Posted in: GLOBE Science Topics: Earth System Science GLOBE Protocols Investigation Areas: Hydrosphere Primary Audience: Students
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