All GHRC Micro Articles

All event micro articles

Micro Article Title Preview Posted Last updated
Lake Effect Snow Event during GCPEx Field Campaign Lake effect snow is generated when cold air moves over warm lake waters such that narrow bands of snow clouds develop. The warmer lake waters heat the lower portions of air causing it to become less dense and begin to rise. As this moisture-laden, warmer air rises it begins to cool leading to condensation and the formation of clouds that can become rather tall enabling the growth of very large snowflakes. Lake effect snow bands can produce snowfall rates exceeding 5 inches an hour, especially if the wind is directed along the largest width of the lake so that a great deal of moisture is continually supplied to the clouds. Wednesday, June 01, 2016 Friday, October 19, 2018
Snow Microphysics Event during GCPEx Field Campaign What is the 3-D structure of falling snow and how does its variability affect remotely sensed retrievals? Thursday, June 16, 2016 Friday, October 19, 2018
Assessing Wind and Rain in Hurricane Ingrid during Hurricane and Severe Storm Sentinel (HS3) Field Campaign Can areas of heavy rain and wind be identified within Ingrid ahead of landfall? Thursday, January 19, 2017 Thursday, November 15, 2018

All instrument micro articles

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Earth Observations: Lightning Imaging Sensor (LIS) The Lightning Imaging Sensor (LIS) detects total lightning (i.e. cloud-to-cloud, cloud-to-ground, and intra-cloud flashes) from a space-based platform. The LIS is based on digital imaging technology and built around a 128 x 128 charged coupled device (CCD) array that is used to extract only the optical emissions of lightning through Earth's atmosphere for both day and night backgrounds. Tuesday, September 13, 2016 Friday, October 19, 2018
Earth Observations: Optical Transient Detector (OTD) The Optical Transient Detector (OTD), a space-based lightning imager on the Orbview-1 satellite, operated during April 1995 to March 2000 as a Lightning Imaging Sensor (LIS) prototype. OTD detected total lightning (cloud-to-cloud, cloud-to-ground, and intracloud flashes) between +/- 75 degrees latitude, but could not distinguish between lightning types. The OTD was essentially a wide field-of-view telescope that captured 500 Earth surface snapshots per second. The supporting electronics monitored these videos for the rapid pulses of light produced by lightning. The pulses were used to detect lightning at any time of day and determine the optical properties such as lightning location, radiant energy, and number of illuminated pixels. Detection efficiency varied between 0.37 (noon) and 0.52 (~6pm), changing with sensor threshold settings, time, location, and storm structure. Detection efficiency was much less in the South Atlantic Anomaly where high radiation levels interfered with instrument measurement. If a storm had optically thick clouds, reflection off middle cloud layers, or low flash altitudes, the lightning signal was difficult to detect. Tuesday, March 21, 2017 Friday, October 19, 2018
Instrument: 2DVD Disdrometer A disdrometer is an optical device situated on a stationary ground station platform that measures properties of different hydrometeor (precipitation) types such as raindrops, snowflakes, and hail. The Two-Dimensional Video Disdrometer (2DVD) uses two high speed line scan cameras to provide continuous measurements of size distribution, shape, and fall velocities of all precipitation particles and types. Two light planes, provided by two internal lamps, cut across the approximate 10x10 cm virtual measurement area and are projected onto two high speed line-scan cameras. Hydrometeors that fall through the light planes cast a shadow that is recorded by the two cameras nested within the instrument. The light planes are separated by a calibrated distance between which the velocity of a falling particle can be measured. The line scan cameras sample each plane every 18 microseconds; therefore, as a hydrometeor falls through the measurement area, several line scans of each image are recorded from two sides and two different heights allowing precise measurements to be made. Thursday, March 08, 2018 Friday, October 19, 2018

All phenomena micro articles

Micro Article Title Preview Posted Last updated
Lightning Description of what lightning is, why and where it occurs on Earth and how it is measured. GHRC instruments, data, and lightning research and applications areas are also introduced. Thursday, May 25, 2017 Friday, October 19, 2018
Lake Effect Snow Learn more about Lake Effect Snow Tuesday, November 21, 2017 Friday, October 19, 2018
Hurricane Description of what a hurricane is, why and where it occurs on Earth and how it is measured. Wednesday, March 07, 2018 Friday, October 19, 2018

All publication micro articles

Micro Article Title Preview Posted Last updated
Highlights from Cecil et. al.'s 'Gridded lightning climatology from TRMM-LIS and OTD: Dataset description' publication Presentation of the highlights and key findings of Cecil et. al.’s publication that utilized LIS/OTD data. Monday, August 15, 2016 Friday, October 19, 2018
Highlights From Peterson et. al.'s 'The Properties of Optical Lightning Flashes and the Clouds They Illuminate' Publication Summary and description of Peterson et. al.’s publication utilizing TRMM LIS data available from GHRC. Thursday, March 23, 2017 Friday, October 19, 2018
Highlights from Albrecht et. al's 'Where Are the Lightning Hotspots on Earth?’ publication Sixteen years of observations from the Lightning Imaging Sensor (LIS) have been reprocessed using a new analysis technique. Thursday, May 25, 2017 Friday, October 19, 2018

All field campaign micro articles

Micro Article Title Preview Posted Last updated
Field Campaign: Hurricane and Severe Storm Sentinel (HS3) Description of the HS3 Field Campaign objectives, findings and instruments. Thursday, May 31, 2018 Thursday, November 15, 2018
Olympic Mountains Experiment (OLYMPEX) Description of the OLYMPEX Field Campaign objectives, findings and instruments. Thursday, September 20, 2018 Thursday, November 15, 2018
Integrated Precipitation and Hydrology Experiment (IPHEx) Description of the IPHEx Field Campaign objectives, findings and instruments. Thursday, November 08, 2018 Thursday, November 15, 2018

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