NASA's Aqua satellite flew over Choi-Wan on September 15 at 1:30 p.m. local time, and captured an infrared image of the storm using the Atmospheric Infrared Sounder (AIRS) instrument. The infrared instrument provides valuable data on a tropical cyclone's cloud top temperatures.
They're important because they tell forecasters how high thunderstorms are, and the higher the thunderstorm, the more powerful it is, and the data helped forecasters see Choi-Wan's cloud tops were as cold as or colder than minus 63 degrees Fahrenheit (F).
AIRS infrared images depict different cloud temperatures in purple and blue. Those cloud that appear in purple on AIRS imagery have temperatures as cold as or colder than 220 degrees Kelvin or minus 63 degrees Fahrenheit (F). The blue areas are around 240 degrees Kelvin, or minus 27F. The colder the clouds are, the higher they are, and the more powerful the thunderstorms are that make up the cyclone. Areas that are false colored as purple, are where meteorologists would also find the "hot tower" clouds that the TRMM and CloudSat satellites see. In fact, in Choi-Wan, CloudSat identified several hot towers.
A hot tower is a tropical cumulonimbus cloud that penetrates the tropopause, i.e. it reaches out of the lowest layer of the atmosphere, the troposphere, into the stratosphere. In the tropics, the tropopause typically lies at least 15 kilometers (over 9 miles high) above sea level. These towers are called "hot" because they rise high due to the large amount of latent heat released as water vapor condenses into liquid.
NASA's CloudSat satellite completed an eye overpass of Super Typhoon Choi-Wan in the Western Pacific Ocean on September 15, at 0352Z (Sept. 14 at 11:52 p.m.). The CloudSat overpass shows the vertical cross section right through the center of the storm. The eye center is free of cirrus clouds with eye wall edges sloping outwards towards the top of the storm and with hot towers on both sides.
Natalie D. Tourville, of the Atmospheric Science Department at Colorado State University Fort Collins, Colo. is a member of the CloudSat team. Tourville said, "The storm has a well developed, fully enclosed circular eye wall (red circle in the image) around the eye center with intense convection and precipitation (orange and red reflectivities) extending outwards. The Aqua Infrared (AIRS) depicts cloud cover throughout the overpass but the CloudSat image reveals moats (convection free areas) containing a thick cirrus canopy between the spiral rain bands."
This is one a few inner eye images CloudSat has managed to capture of a Category 5 tropical cyclone.
Data from TRMM over flights are used in making the rainfall analysis at NASA's Goddard Space Flight Center in Greenbelt Md. The rainfall analysis showed that Choi-Wan is a large and well-organized. TRMM's Microwave Imager and Precipitation Radar instruments revealed that Choi-Wan has bands of heavy rainfall.
NASA's TRMM satellite captured an image of Choi-Wan's rainfall on September 13, as it was approaching Super Typhoon status. Rainfall in some areas exceeded 50 mm/hr, that's almost 2 inches per hour!
NASA satellites provide daily information to the National Hurricane Center, the Central Pacific Hurricane Center, and the U.S. Navy's Joint Typhoon Warning Center, all of whom forecast tropical cyclones.
For more information and updates about Choi-Wan's intensity and status, please visit: http://www.nasa.gov/mission_pages/hurricanes/archives/2009/h2009_Choi-Wan.html.
Text credit: Rob Gutro, NASA/Goddard Space Flight Center
Rob Gutro | EurekAlert!
New Study Will Help Find the Best Locations for Thermal Power Stations in Iceland
19.01.2017 | University of Gothenburg
Water - as the underlying driver of the Earth’s carbon cycle
17.01.2017 | Max-Planck-Institut für Biogeochemie
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
20.01.2017 | Awards Funding
20.01.2017 | Materials Sciences
20.01.2017 | Life Sciences