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Airborne in situ measurements of cir...

Davis, Sean Michael.

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Airborne in situ measurements of cirrus cloud total water using a laser hygrometer and intercomparisons with satellite observations.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Airborne in situ measurements of cirrus cloud total water using a laser hygrometer and intercomparisons with satellite observations./
Author:	Davis, Sean Michael.
Description:	298 p.
Notes:	Adviser: Sean M. Davis.
Contained By:	Dissertation Abstracts International68-11B.
Subject:	Atmospheric Sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3284463
ISBN:	9780549315162

Airborne in situ measurements of cirrus cloud total water using a laser hygrometer and intercomparisons with satellite observations.
Davis, Sean Michael.

Airborne in situ measurements of cirrus cloud total water using a laser hygrometer and intercomparisons with satellite observations. - 298 p.

Adviser: Sean M. Davis.

Thesis (Ph.D.)--University of Colorado at Boulder, 2007.

Clouds have an enormous impact on the cycling of mass, energy, and chemical constituents within the atmosphere, yet they remain one of the least understood aspects of Earth's climate. Within this context, high altitude cirrus clouds are important because of their potential effects on radiative forcing, water vapor distributions, and ozone chemistry. Accurate measurements of microphysical and radiative properties from both aircraft and satellite platforms are essential for improving the understanding of cirrus.

ISBN: 9780549315162Subjects--Topical Terms:

1019179
Atmospheric Sciences.

Airborne in situ measurements of cirrus cloud total water using a laser hygrometer and intercomparisons with satellite observations.
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020 $a 9780549315162
035 $a (UMI)AAI3284463
035 $a AAI3284463
040 $a UMI $c UMI
100 1 $a Davis, Sean Michael. $3 1266262
245 1 0 $a Airborne in situ measurements of cirrus cloud total water using a laser hygrometer and intercomparisons with satellite observations.
300 $a 298 p.
500 $a Adviser: Sean M. Davis.
500 $a Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7187.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2007.
520 $a Clouds have an enormous impact on the cycling of mass, energy, and chemical constituents within the atmosphere, yet they remain one of the least understood aspects of Earth's climate. Within this context, high altitude cirrus clouds are important because of their potential effects on radiative forcing, water vapor distributions, and ozone chemistry. Accurate measurements of microphysical and radiative properties from both aircraft and satellite platforms are essential for improving the understanding of cirrus.
520 $a In recent years, the University of Colorado closed-path laser hygrometer (CLH) was coupled to a subisokinetic inlet system for measuring the "enhanced" total water content of cirrus clouds from aboard the NASA WB-57 high altitude research aircraft. The CLH enhanced total water content is used, with auxiliary measurements, to determine the cirrus ice water content (IWC). The CLH water vapor measurement, IWC determination process, and instrument accuracy are assessed in this thesis. IWC derived from CLH observations from the Midlatitude Cirrus Experiment (MidCiX) is compared to IWC from two independent instruments to assess their level of agreement. These comparisons show that cirrus IWC values generally agree to within the stated instrumental uncertainties, and that aircraft-based IWC measurements can, in principle, provide a constraint to the values retrieved from satellite measurements.
520 $a During MidCiX, the WB-57 aircraft sampled cirrus concurrently with overpasses from the NASA Terra and Aqua satellites. Retrievals of cirrus cloud optical thickness and ice water path from the MODIS and AIRS satellite instruments are compared with values calculated from in situ measurements. These examples highlight both the general limitations of satellite-aircraft intercomparisons and the specific limitations of the satellite and aircraft measurements. It is shown that the MODIS operational retrieval of cirrus is biased by the presence of lower lying cloud layers, and that in some cases the discrepancies with aircraft data are consistent with the contamination of aircraft probe observations by shattered particles. These findings have implications not only for the quality of satellite and aircraft-based measurements, but also for estimates of cirrus radiative forcing derived from such data.
590 $a School code: 0051.
650 4 $a Atmospheric Sciences. $3 1019179
690 $a 0725
710 2 $a University of Colorado at Boulder. $b Program in Atmospheric and Oceanic Sciences. $3 1019555
773 0 $t Dissertation Abstracts International $g 68-11B.
790 $a 0051
790 1 0 $a Avallone, Linnea M. $e committee member
790 1 0 $a Davis, Sean M., $e advisor
790 1 0 $a Heymsfield, Andrew J. $e committee member
790 1 0 $a Jensen, Eric J. $e committee member
790 1 0 $a Pilewskie, Peter $e committee member
790 1 0 $a Toohey, Darin W. $e committee member
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3284463