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The relationship of ice water conten...

Luebke, Anna Elizabeth.

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The relationship of ice water content to atmospheric and microphysical properties in cirrus clouds based on in situ measurements.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The relationship of ice water content to atmospheric and microphysical properties in cirrus clouds based on in situ measurements./
作者:	Luebke, Anna Elizabeth.
面頁冊數:	163 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.
Contained By:	Dissertation Abstracts International75-09B(E).
標題:	Atmospheric sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3621373
ISBN:	9781303924163

The relationship of ice water content to atmospheric and microphysical properties in cirrus clouds based on in situ measurements.
Luebke, Anna Elizabeth.

The relationship of ice water content to atmospheric and microphysical properties in cirrus clouds based on in situ measurements. - 163 p.

Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.

Thesis (Ph.D.)--University of Colorado at Boulder, 2014.

This item must not be sold to any third party vendors.

Ice clouds are known to be major contributors to radiative forcing in the atmosphere, yet understanding and describing their microphysical properties remains challenging. The ice water content (IWC) of cirrus clouds is of particular interest because it can be directly related to a number of other radiatively important variables such as extinction and effective radius. This dissertation explores data obtained from numerous airborne research campaigns to elucidate the dominant factors that determine the IWC and crystal concentration (Ni) characterizing cirrus clouds.

ISBN: 9781303924163Subjects--Topical Terms:

3168354
Atmospheric sciences.

The relationship of ice water content to atmospheric and microphysical properties in cirrus clouds based on in situ measurements.
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245 1 4 $a The relationship of ice water content to atmospheric and microphysical properties in cirrus clouds based on in situ measurements.
300 $a 163 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.
500 $a Adviser: Linnea M. Avallone.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2014.
506 $a This item must not be sold to any third party vendors.
520 $a Ice clouds are known to be major contributors to radiative forcing in the atmosphere, yet understanding and describing their microphysical properties remains challenging. The ice water content (IWC) of cirrus clouds is of particular interest because it can be directly related to a number of other radiatively important variables such as extinction and effective radius. This dissertation explores data obtained from numerous airborne research campaigns to elucidate the dominant factors that determine the IWC and crystal concentration (Ni) characterizing cirrus clouds.
520 $a The first part of this study uses a new merged dataset to obtain a representation of the IWC-temperature relationship using probability distribution functions (PDFs), which allows for the variability of IWC within a temperature band to be visualized. The IWC-PDFs are observed to be bimodal over the whole cirrus temperature range. This bimodality is also found in Ni-PDFs and might be attributed to different cirrus formation mechanisms such as heterogeneous and homogeneous freezing.
520 $a Next, two midlatitude datasets (MACPEX and MidCiX) with differing IWC and Ni distributions are used to explore how cloud formation processes contribute to the resulting cirrus characteristics. Starting with large-scale processes, a case study analysis demonstrates the link between synoptic-scale dynamics and the differences observed between the MACPEX and MidCiX datasets. However, that link is not always clear, indicating that additional information is required to explain it. This is particularly evident when considering the Ni observations from MACPEX, which appear unaffected by factors such as vertical velocity. This result is unexpected considering the relationship between vertical velocity and nucleation processes.
520 $a The final component of this analysis explores the cirrus formation processes at the nucleation level, while continuing to examine why the data in MACPEX and MidCiX are different from each other. A comparison to model simulations reveals that heterogeneous nucleation and subsequent homogeneous nucleation suppression are responsible for the Ni distribution in MACPEX. Conversely, the MidCiX IWC and Ni datasets exhibit a compatibility with model results showing heterogeneous nucleation followed by a secondary homogeneous nucleation event. Thus, it is likely that the differences observed in MACPEX and MidCiX mostly stem from differences in ice nuclei concentrations.
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650 4 $a Atmospheric sciences. $3 3168354
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710 2 $a University of Colorado at Boulder. $b Atmospheric and Oceanic Sciences. $3 1677746
773 0 $t Dissertation Abstracts International $g 75-09B(E).
790 $a 0051
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3621373