[Parameters: Topic='ATMOSPHERE', Term='ATMOSPHERIC WINDS', Variable_Level_1='VORTICITY']
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The Stratosphere-Troposphere Exchange Project (STEP) Data on CD-ROM Entry ID: STEP87 |
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Summary
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Abstract:
This CD-ROM contains data collected from the Stratosphere-Troposphere Exchange Project (STEP) conducted onboard the NASA ER-2 aircraft in January and February, 1987 based in Darwin, Australia. This mission was the last of 6 STEP missions which started with the Variability and Global Tropospheric Experiment (GTE) Coop assignment in April 1984, based in Moffett Field, California. Altogether, 4 science missions and 2 intercalibration missions comprised STEP, with the science missions designed to investigate different aspects of stratosphere-troposphere exchange (in mass, trace gases, and aerosols), including cloud-free and cloud-dominated mechanisms in both the mid-latitudes and the tropics. STEP also observed the extreme dryness of the stratosphere. STEP was carried out under NASA and the National Oceanic Atmospheric Administration (NOAA). The Darwin, Australia phase of STEP utilized 15 instruments and accessed the world's highest, coldest tropopause as well as the largest penetrating cumulonimbus anvils. The flights were designed to test a dehydration mechanism proposed by Danielsen (1982), as well as to acquire sufficient data to test and develop other hypotheses. STEP's first mission was flown in April-May 1984 using six instruments on the NASA U-2 aircraft. The most striking result was the discovery in the stratosphere of highly laminated structures of ozone, water vapor, and condensation nuclei. The U-2 wind measurements indicated that the laminae are caused by waves that fold mixing ratio and potential vorticity surfaces. The folding process greatly increases the vertical gradients of the mixing ratios and the potentials for small-scale instabilities. The latter lead to irreversible mixing; thus a reversible wave-generated transport is rendered irreversible by small-scale instabilities. |
Related URL
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Link:
VIEW PROJECT HOME PAGE
Description: The Stratospheric-Troposphere Exchange Project (STEP) home page. |
Geographic Coverage
| N: 45.0 | S: -30.0 | E: -120.0 | W: 130.0 |
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Temporal Coverage
| Start Date: 1984-04-01 |
| Stop Date: 1987-02-28 |
Location Keywords
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OCEAN
> PACIFIC OCEAN
CONTINENT > AUSTRALIA/NEW ZEALAND > AUSTRALIA GEOGRAPHIC REGION > EQUATORIAL GEOGRAPHIC REGION > MID-LATITUDE VERTICAL LOCATION > STRATOSPHERE VERTICAL LOCATION > TROPOSPHERE |
Science Keywords
| ATMOSPHERE >AEROSOLS >AEROSOL EXTINCTION [Definition] |
| ATMOSPHERE >AEROSOLS >CLOUD CONDENSATION NUCLEI [Definition] |
| ATMOSPHERE >AIR QUALITY >CARBON MONOXIDE [Definition] |
| ATMOSPHERE >ATMOSPHERIC CHEMISTRY >TRACE GASES/TRACE SPECIES [Definition] |
| ATMOSPHERE >ATMOSPHERIC PRESSURE >ATMOSPHERIC PRESSURE MEASUREMENTS [Definition] |
| ATMOSPHERE >ATMOSPHERIC TEMPERATURE >AIR TEMPERATURE [Definition] |
| ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY [Definition] |
| ATMOSPHERE >ATMOSPHERIC WATER VAPOR >WATER VAPOR [Definition] |
| ATMOSPHERE >ATMOSPHERIC WINDS >SURFACE WINDS [Definition] |
| ATMOSPHERE >ATMOSPHERIC WINDS >UPPER LEVEL WINDS [Definition] |
| ATMOSPHERE >ATMOSPHERIC WINDS >VORTICITY [Definition] |
| ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD FREQUENCY [Definition] |
| ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD CONDENSATION NUCLEI [Definition] |
| ATMOSPHERE >CLOUDS >CLOUD TYPES [Definition] |
| ATMOSPHERE >ATMOSPHERIC RADIATION >SOLAR RADIATION [Definition] |
| ATMOSPHERE >ATMOSPHERIC CHEMISTRY >CARBON AND HYDROCARBON COMPOUNDS >CARBON DIOXIDE [Definition] |
| ATMOSPHERE >ATMOSPHERIC CHEMISTRY >CARBON AND HYDROCARBON COMPOUNDS >CARBON MONOXIDE [Definition] |
| ATMOSPHERE >ATMOSPHERIC CHEMISTRY >NITROGEN COMPOUNDS >MOLECULAR NITROGEN [Definition] |
| ATMOSPHERE >ATMOSPHERIC CHEMISTRY >OXYGEN COMPOUNDS >OZONE [Definition] |
ISO Topic Category
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CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ENVIRONMENT |
Platform
| NASA ER-2 >NASA Earth Resources-2 [Information] |
Instrument
| HYGROMETERS [Information] |
| MMS >Meteorological Measurement System [Information] |
| PROFILERS [Information] |
| PHOTOMETERS [Information] |
| TEMPERATURE PROFILERS [Information] |
| SPECTROMETERS [Information] |
Project
| STEP >Stratosphere-Troposphere Exchange Project [Information] |
Keywords
| AEROSOL |
| CD-ROM |
| CLIMATOLOGY |
| CLOUD |
| CONDENSATION NUCLEI |
| NASA ER-2 |
| POTENTIAL VORTICITY |
| STEP |
| UPPER AIR |
Originating Center
| ARC |
Data Center
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Earth Science Project Office, Earth Sciences Division, Ames Research Center, NASA
[Information]
Data Center URL: http://www.espo.nasa.gov/
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Distribution
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Distribution_Media:
CD-ROM
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Personnel
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EDWIN
F.
DANIELSEN Role: INVESTIGATOR Phone: (415) 604-5527 Phone: FTS 464-5527 Contact Address: NASA Ames Research Center MS 245-3 City: Moffett Field Province or State: CA Postal Code: 94035 Country: USA |
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SCOTT
A.
RITZ Role: DIF AUTHOR Phone: 301-614-5126 Fax: 301-614-5268 Email: Scott.A.Ritz at nasa.gov Contact Address: NASA Goddard Space Flight Center Global Change Master Directory City: Greenbelt Province or State: Maryland Postal Code: 20771 Country: USA |
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PHILIP
B.
RUSSELL Role: TECHNICAL CONTACT Phone: (415) 604-5404 Contact Address: NASA Ames Research Center MS 245-5 City: Moffett Field Province or State: CA Postal Code: 94035 Country: USA |
Creation and Review Dates
DIF Creation Date:
2001-10-02
Last DIF Revision Date:
2012-02-09
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