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Consider the rain gauge used in GLOBE, CoCoRaHS, and other citizen science programs. Just four pieces plus 2 mounting screws – an inner graduated cylinder, an outer cylinder, a cap/funnel, and a mounting bracket. The area of the outer tube is exactly 10 times the areas of the inner tube and the cap/funnel, so the graduations on the inner cylinder can be spaced ten times further apart. Thus, 0.2 mm of rain fills the inner tube to a depth of 2.0 mm, which one can read. In addition, if heavy rainfall fills the inner cylinder, the rest of the rainfall overflows into the outer cylinder,...


Posted in: Curriculum: STEM Field Campaigns: El Niño GPM GLOBE Science Topics: Backyard Science GLOBE Protocols Investigation Areas: Atmosphere Primary Audience: Alumni Students Teachers

In most scientific research an important test is whether the results of an experiment can be repeated, typically repeated by another lab and research group. A result that cannot be confirmed in this way is generally viewed as invalid. This is a great test for controlled experiments where virtually identical experimental conditions may be achieved. In Earth science research involving observations of the natural world, experimental conditions cannot be reproduced. For environmental research the standard must switch for repeatable to intercomparable – capable of being compared. Research...


Posted in: GLOBE Science Topics: Backyard Science General Science GLOBE Protocols Earth System Science Investigation Areas: Atmosphere Hydrosphere Pedosphere (Soil) Biosphere Primary Audience: Alumni Scientists Students Teachers Trainers
By Dixon Matlock Butler, posted 10/20/16 12:00 PM

Yesterday, I visited Bell Multicultural High School and Lincoln Middle School, which share a campus near my home. It was inspiring, and I saw good science teaching with students doing research experiments dealing with bioremediation of soils. In discussions, I found myself talking about GLOBE and the many aspects of what the Program offers. Students were experimenting with plant uptake of soil contaminants and were planning to take water samples from the Anacostia River bordering the area where they had collected soil samples. Their insight into the soil could be greatly expanded...


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A heat lamp and reflector socket with a spring clamp may be purchased on-line for as little as $26. The amount of time required to dry samples depends on many things including the wetness of the initial sample, the soil characteristics, the relative humidity, and the temperature to which the sample is heated. GLOBE protocols specify that samples are not to be heated above 105 o C. In using a heat lamp, the temperature to which the sample is heated depends on the wattage of the bulb and the distance between the heat lamp and the sample bag. I have tried drying a sample using this...


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GLOBE students measure the current values of many environmental properties, but the Precipitation Protocol measures the total amounts and the Max/Min Atmosphere and Soil Temperature protocols measure the extremes that have occurred during the previous 24 hours. At the beginning of GLOBE, the time of day for these daily measurements was chosen as within one hour of local solar noon. The thought was that the middle of the school day would be an easy time to have students go outside and take data. Today in GLOBE, the air and soil temperatures can be measured with the digital multi-day...


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