東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Regional aerosol radiative and hydro...

Howard University., Physics and Astronomy.

Linked to FindBook

Google Book

Amazon

博客來

Regional aerosol radiative and hydrological effects over the mid-Atlantic corridor.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Regional aerosol radiative and hydrological effects over the mid-Atlantic corridor./
Author:	Creekmore, Torreon N.
Description:	182 p.
Notes:	Adviser: Everette Joseph.
Contained By:	Dissertation Abstracts International70-04B.
Subject:	Atmospheric Sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3352389
ISBN:	9781109092653

Regional aerosol radiative and hydrological effects over the mid-Atlantic corridor.
Creekmore, Torreon N.

Regional aerosol radiative and hydrological effects over the mid-Atlantic corridor. - 182 p.

Adviser: Everette Joseph.

Thesis (Ph.D.)--Howard University, 2009.

A thorough assessment of direct, indirect, and semi-direct influences of aerosols on Earth's energy budget is required to better understand climate and estimate how it may change in the future. Clear-sky surface broadband (measured and modeled) irradiance, spectral aerosol optical depth, heating rate profiles, and non-radiative flux measurements were conducted at a state-of-the-art site, developed by the NOAA-Howard University Center for Atmospheric Sciences (NCAS) program, providing a best estimate of aerosol radiative atmosphere-surface interactions. Methods developed by the Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Program were applied to: (1) temporally quantify regional aerosol forcing, (2) to derive an empirical equation describing a relationship between aerosol optical depth and normalized diffuse ratio, (3) evaluate aerosol impacts on atmospheric heating, and (4) evaluate how aerosol forcing impacts may possibly reduce latent and sensible fluxes. Measurements were obtained during the period of May--September for the years of 2005, 2006, and 2007.

ISBN: 9781109092653Subjects--Topical Terms:

1019179
Atmospheric Sciences.

Regional aerosol radiative and hydrological effects over the mid-Atlantic corridor.
LDR:04971nam 2200337 a 45 001 853303
005 20100701
008 100701s2009 ||||||||||||||||| ||eng d
020 $a 9781109092653
035 $a (UMI)AAI3352389
035 $a AAI3352389
040 $a UMI $c UMI
100 1 $a Creekmore, Torreon N. $3 1019551
245 1 0 $a Regional aerosol radiative and hydrological effects over the mid-Atlantic corridor.
300 $a 182 p.
500 $a Adviser: Everette Joseph.
500 $a Source: Dissertation Abstracts International, Volume: 70-04, Section: B, page: .
502 $a Thesis (Ph.D.)--Howard University, 2009.
520 $a A thorough assessment of direct, indirect, and semi-direct influences of aerosols on Earth's energy budget is required to better understand climate and estimate how it may change in the future. Clear-sky surface broadband (measured and modeled) irradiance, spectral aerosol optical depth, heating rate profiles, and non-radiative flux measurements were conducted at a state-of-the-art site, developed by the NOAA-Howard University Center for Atmospheric Sciences (NCAS) program, providing a best estimate of aerosol radiative atmosphere-surface interactions. Methods developed by the Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Program were applied to: (1) temporally quantify regional aerosol forcing, (2) to derive an empirical equation describing a relationship between aerosol optical depth and normalized diffuse ratio, (3) evaluate aerosol impacts on atmospheric heating, and (4) evaluate how aerosol forcing impacts may possibly reduce latent and sensible fluxes. Measurements were obtained during the period of May--September for the years of 2005, 2006, and 2007.
520 $a Atmospheric aerosols are among the key uncertainties affecting the Earth's climate and atmospheric radiative processes. Present-day increases in aerosol concentrations directly, indirectly, and semi-directly impact the Earth's energy budget (i.e., cooling the surface and heating the atmosphere), thereby contributing to climate change. The Howard University Beltsville Site (HUBS) has experienced a greater loss in mean normalized aerosol radiative forcing with time, as observations show a decrease from --0.9 in 2005 to --3.1 and --3.4 W/m2 for 2006 and 2007 respectively, in mean net surface irradiance. The mean normalized aerosol radiative forcing estimated for the period considered was --2.5 W/m2. The reduction in surface solar insolation is due to increased scattering and absorption related to increased aerosol burdens v for the period, promoting surface cooling and atmospheric heating. Calculation of radiative flux and heating rates profiles, which are constrained by HUBS observations, were performed by the 1-D Fu-Liou radiative transfer model to investigate the effect of polluted and pristine aerosol conditions on the surface energy budget and hydrological cycle. For HUBS the surface forcing (--14.2 W/m2) and atmospheric forcing (9.9 W/m2) were significantly larger than the TOA (--4.3 W/m2) radiative forcing. Associated aerosol heating, as well as reduced surface insolation, may lead to increasing near surface static stability, and reduced vertical transport of moisture into the atmospheric boundary layer, and over time, a possible spin-down of the hydrological cycle.
520 $a It is shown that HUBS provides an ideal opportunity for improving measurements and datasets, thus allowing for both the study and understanding of aerosol impacts on the climate system. Further, results show that in order to provide reference quality data and constrain aerosol radiative effects over land, ground-based research sites must conform to HUBS standards of: (1) instrumentation (e.g. passive and active sensors); (2) operational protocols (e.g. calibration and routine cleaning); (3) rigorous cloud screening protocols; and (3) incorporation of ARM QC and modified FFA algorithms. HUBS surface measurements provides the reference quality data necessary and capability required to help enhance measurements and constrain current uncertainties in estimates of aerosol direct effects over land. Incorporating a combined technique of both active and passive instruments reduced the direct radiative forcing estimates by ~82 W/m 2. The analysis of aerosol effects over HUBS helps continue in bridging the gap of applying measurements for improvement of climate simulations by generating observational products, which describes aerosol and radiation field characteristics in detail.
590 $a School code: 0088.
650 4 $a Atmospheric Sciences. $3 1019179
690 $a 0725
710 2 $a Howard University. $b Physics and Astronomy. $3 1019550
773 0 $t Dissertation Abstracts International $g 70-04B.
790 $a 0088
790 1 0 $a Demoz, Belay $e committee member
790 1 0 $a Jenkins, Gregory $e committee member
790 1 0 $a Joseph, Everette, $e advisor
790 1 0 $a Nalli, Nicholas $e committee member
790 1 0 $a Stockwell, William $e committee member
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3352389