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Lidar Studies of Atmospheric Structure, Dynamics and Climatology

Entry ID: lidar

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Summary

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.

Related URL

Link: VIEW PROJECT HOME PAGE

Description: Public information for ASAC project 737

Geographic Coverage

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Spatial coordinates

	N: -68.56	S: -68.58	E: 77.97	W: 77.95
Min Altitude: 0 KM Max Altitude: 100 KM

Temporal Coverage

Start Date: 2001-02-07

Location Keywords

CONTINENT > ANTARCTICA > Davis

GEOGRAPHIC REGION > POLAR

Data Resolution

Latitude Resolution: 0
Longitude Resolution: 0
Vertical Resolution: 18.7 m
Temporal Resolution: 60 seconds

Science Keywords

ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD FREQUENCY

ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD HEIGHT

ATMOSPHERE > CLOUDS

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Platform

AQUA > Earth Observing System, AQUA

Instrument

MODIS > Moderate-Resolution Imaging Spectroradiometer

Project

EOS > Earth Observing System

EOSDIS > Earth Observing System Data Information System

ESIP > Earth Science Information Partners Program

AQUA > Earth Observing System (EOS), AQUA

Quality The following web site provides quality information on the MYD35_L2 product:

http://modis-atmos.gsfc.nasa.gov/MOD35_L2/qa.html

Access Constraints Public (Beta Version)

Available to public to gain familiarity with the data format and
parameters.

Use Constraints The following web site provides information on MYD35_L2 constraints:

http://modis-atmos.gsfc.nasa.gov/MOD35_L2/qa.html

Ancillary Keywords

cloud fraction

sun-glint

Data Set Progress

IN WORK

Data Center

L1 and Atmosphere Archive and Distribution System,Biospheric Information Systems Branch, Hydrospheric and Biospheric Sciences Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

Data Center URL: http://ladsweb.nascom.nasa.gov/
Dataset ID: MYD35_L2 Collection 004 and 005

Data Center Personnel
Name: LAADS USER SUPPORT TEAM Phone: 301-731-2917, 1-866-506-6347 (toll-free - US only) Fax: 301-577-6622 Email: modapsuso at sigmaspace.com Contact Address: LAADS User Support Team 4801 Forbes Boulevard City: Lanham Province or State: MD Postal Code: 20706 Country: USA

Distribution

Distribution Media: FTP

Distribution Size: 15 GB

Distribution Format: HDF

Fees: None

Personnel

PAUL, DR. MENZEL

Role: INVESTIGATOR

Phone: 608-264-5325

Fax: 608-262-5974

Email: paulm at ssec.wisc.edu

Contact Address:

NOAA/NESDIS

Space Science and Engineering Center

University of Wisconsin-Madison

1225 W. Dayton St.

City: Madison

Province or State: WI

Postal Code: 53706

Country: USA

Publications/References

Ackerman,S. K. Strabala, P. Menzel, R. Frey, C. Moeller, L. Gumley,
B. Baum, C. Schaaf, and G. Riggs,1998: Discriminating Clear Sky from
Clouds (Cloud Mask Retrieval Algorithm) Theoretical Basis
Document. ATBD-MOD-06, NASA Goddard Space Flight Center, 32 pp.

Ackerman,S. K. ...

Extended Metadata Properties

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Creation and Review Dates

DIF Creation Date: 2007-05-04

Last DIF Revision Date: 2011-05-09

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