[Parameters: Topic='ATMOSPHERE', Term='ATMOSPHERIC PRESSURE', Variable_Level_1='GRAVITY WAVE']
Lidar Studies of Atmospheric Structure, Dynamics and ClimatologyEntry ID: lidar
Abstract: The lidar profiles density, temperature, wind velocity and aerosol loading from the lower troposphere to the upper mesosphere, depending on operating mode.
Two main measurement techniques are employed. Firstly, traditional Rayleigh backscatter analysis yields temperature profiles above the top of the stratospheric aerosol layer (greater than about 27km altitude). The temperatures are obtained ... from lidar-derived density profiles, calibrated with in-situ radiosonde data below 40km altitude, using the standard hydrostatically-constrained perfect gas law model. When available, hydroxyl-layer temperatures obtained locally by a Czerny-Turner spectrograph are used as an upper boundary condition on the temperature retrieval algorithm. Rayleigh backscatter can be detected from altitudes as high as 100km, although useful temperatures are normally limited to below 80km. Observations of rotational-vibrational Raman backscatter from molecular oxygen or nitrogen are used to extend the temperature profiles into the lower stratosphere and upper troposphere. Profiles of aerosol-loading are derived from standard scattering-ratio analysis, allowing identification of clouds in the upper troposphere, stratosphere (Polar Stratospheric Clouds) and mesosphere (Polar Mesospheric Clouds).
Secondly, spectral scans of laser backscatter are obtained with a high-resolution Fabry-Perot spectrometer. These are used to infer the line-of-sight wind speed and temperature by using the Doppler effect. Observations along 'cardinal point' lines-of-sight provide information on wind direction. In general, Doppler measurements are restricted to altitudes below about 70km based on signal detection considerations. Some information on aerosol loading is obtained from analysis of the spectral properties of the backscatter.
The lidar is capable of both day and night measurements covering a large altitude range, and in so doing will provide information for the study of climate change and a range of atmospheric phenomena on a variety of spatial and temporal scales.
Taken from the 2008-2009 Progress Report:
Progress against objectives:
At Davis, lidar measurements of temperature and aerosol properties were acquired for the troposphere, stratosphere and mesosphere. Additionally, ozone data were acquired for the troposphere and lower stratosphere.
Ongoing analyses of these data is providing new information on the composition, dynamics and climate of the polar atmosphere. During the reporting period, continued progress was achieved in international collaborative studies of Polar Stratospheric Cloud microphysics as part of the International Polar Year, and measurements of Polar Mesospheric Clouds for the Aeronomy of Ice in the Mesosphere (AIM) satellite mission. Both of these activities contribute to all 4 goals of the project.
Taken from the 2009-2010 Progress Report:
Progress against objectives:
New data were obtained for the study of the long-term climate in the Antarctic middle atmosphere (5-95km altitude), and atmospheric phenomena under extreme physical conditions. The highlights were: (1) Detailed measurements of ice clouds in the summer mesopause region for validation of climate models. (2) Further measurements of the properties and dynamics of Polar Stratospheric Clouds for research aimed at improving projections of the recovery of the Ozone Hole. (3) Initial measurements for a new study of the interactions between the troposphere and stratosphere which is aimed at improved knowledge of climate processes in the tropopause region.
(Click for Interactive Map)
Start Date: 2001-02-07
Latitude Resolution: 0
Longitude Resolution: 0
Vertical Resolution: 18.7 m
Temporal Resolution: 60 seconds
ATMOSPHERE > AEROSOLS > AEROSOL BACKSCATTER
ATMOSPHERE > AEROSOLS > AEROSOL EXTINCTION
ATMOSPHERE > AEROSOLS > AEROSOL OPTICAL DEPTH/THICKNESS
ATMOSPHERE > AEROSOLS > AEROSOL PARTICLE PROPERTIES
ATMOSPHERE > AEROSOLS > CLOUD CONDENSATION NUCLEI
ATMOSPHERE > ALTITUDE > GEOPOTENTIAL HEIGHT
ATMOSPHERE > ALTITUDE > STRATOPAUSE
ATMOSPHERE > ATMOSPHERIC PRESSURE > DIFFERENTIAL PRESSURE
ATMOSPHERE > ATMOSPHERIC PRESSURE > GRAVITY WAVE
ATMOSPHERE > ATMOSPHERIC TEMPERATURE > AIR TEMPERATURE
ATMOSPHERE > ATMOSPHERIC WINDS > UPPER LEVEL WINDS
ATMOSPHERE > ATMOSPHERIC WINDS > VERTICAL WIND MOTION
ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD HEIGHT
ATMOSPHERE > CLOUDS > CLOUD TYPES
ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD VERTICAL DISTRIBUTION
ATMOSPHERE > ATMOSPHERIC RADIATION > SCATTERING
ATMOSPHERE > ATMOSPHERIC RADIATION > TRANSMITTANCE
ATMOSPHERE > ATMOSPHERIC PRESSURE
ISO Topic Category
Quality ATTRIBUTE ACCURACY REPORT: Not provided
LOGICAL CONSISTENCY REPORT: Unknown
COMPLETENESS REPORT: Completeness information not available.
PROCESS DESCRIPTION: Unknown
PROCESS DATE: Unknown
Access Constraints ACCESS CONSTRAINTS: None
DISTRIBUTION LIABILITY: Every effort has been made to ensure that these data are accurate and reliable within the limits of current NOAA quality control procedures. NOAA can only certify that the data provided to its customers is an authentic copy of the records which were accepted for inclusion in NOAA archives. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Use Constraints None
Data Set Progress
Role: DIF AUTHOR
Email: ncdc.metadata at noaa.gov
151 Patton Avenue Room 468
Province or State: North Carolina
Postal Code: 28801-5001
Creation and Review Dates
DIF Creation Date: 2006-06-27
Last DIF Revision Date: 2009-04-20