Directory

News and Events

Sources and Characteristics of...

Hydraulic Jump-like Dynamics Above...

Assessing Global Biogeochemical...

Upcoming Seminar

Sources and Characteristics of Particulate Matter in an Urban/Agricultural/Desert Setting

Wed, Jan 27, 2021

270 Seminar

Speaker: Roya Bahreini

Institution: UC Riverside

Abstract:

The Imperial Valley is the second largest agricultural region in California and is home to the Salton Sea, the largest endorheic lake west of the Mississippi. The Imperial County communities surrounding the Salton Sea suffer from extreme levels of air pollution, especially aerosol particles. This has led to negative health outcomes and low socioeconomic factors. Due to the high input of agricultural runoffs in the lake over the past decades, its salinity has been increasing to twice as much as ocean water. Additionally, concentrations of selenium (Se) in the water and sediments are high and increasing. Recent water management practices in the region have led to a sharp decrease in the Salton Sea water levels, worsening its water quality, and exposing the playa along its shores. Primary dust emissions from the recently exposed playa mobilize trace pollutants to the atmosphere and contribute to the region’s PM2.5 and PM10 (aerosols ≤ 2.5 mm and 10 mm in aerodynamic size, respectively) concentrations.

In this talk, I present results on mineral and ionic composition of suspended and depositing aerosols in Imperial Valley to determine sources of airborne dust particles and quantify the influence of the exposed playa vs. the local arid lands in controlling dust emissions. I will also examine the spatial and temporal patterns of aerosol components using data from passive samplers deployed at five sites, spanning from the remote/background to urban and shoreline locations in IV. Enrichment factors and positive matrix factorization (PMF) results were used to identify and to estimate the contribution of various dust sources in the region. The PMF resolved the data from these samplers with seven factors, six of which have anthropogenic influences, contributing to 55-80% of the collected aerosol mass. Additionally, we determined that playa emissions were most intense during late spring/early summer. Minerology of the collected samples during an intense dust event suggest that evaporite minerals of playa, particularly magnesium and sulfate, are important for playa emissivity. In our first study at the Salton Sea, we observed strong seasonal variations in Se concentrations with higher enrichments on fine aerosols, suggesting a seasonal cycle of Se volatilization from the playa and/or the sediments and formation of secondary aerosols through condensation. I will conclude the seminar with results from our laboratory-based experiments examining the potential for atmospheric oxidation of organoselenium compounds to contribute to Se-enrichment in ambient aerosols.

Zoom: https://ucla.zoom.us/j/98770296517

Adeyemi Adebiyi	Postdoctoral Scholar	aadebiyi [at] ucla.edu
Fiaz Ahmed	Assistant Project Scientist
Blanca Alvarez	Graduate Student	balvarez [at] atmos.ucla.edu
Xin An	Postdoctoral Scholar	xinan [at] atmos.ucla.edu
Akio Arakawa	Distinguished Research Professor Emeritus	aar [at] atmos.ucla.edu	MSA 7141
Tersi Arias	Graduate Student	tersiarias [at] atmos.ucla.edu
Alex Arnold	Graduate Student
Homayon Aryan	Associate researcher	homayonaryan [at] atmos.ucla.edu
Cody Ashe-McNalley	Systems Administrator / Programmer	cody [at] atmos.ucla.edu	MSA 7101
Roy Bakan	Assistant Researcher
Catherine Banach		cbanach [at] atmos.ucla.edu
Benjamin Bass		benb0228 [at] g.ucla.edu
Marco Sandoval Belmar	Graduate Student	marcsandovalb [at] atmos.ucla.edu
Daniele Bianchi	Assistant Professor	dbianchi [at] atmos.ucla.edu	MSA 7949
Jacob Bortnik	Professor	jbortnik [at] atmos.ucla.edu	MSA 7228
Nathaniel Brockway	Graduate Student	nwbrock [at] atmos.ucla.edu
Zhijiong Cao	Graduate Student	czj9763 [at] g.ucla.edu
Maria Esther Capo Truyols		estheraula [at] gmail.com
Santiago Giraldo Cardenas	Graduate Student	santigiraldoc [at] atmos.ucla.edu
Marcelo Chamecki	Professor	chamecki [at] ucla.edu
Yi Chao	Adjunct Professor	ychao001 [at] gmail.com
Mickael D. Chekroun	Associate researcher	mchekroun [at] atmos.ucla.edu
Gang Chen	Professor	gchenpu [at] atmos.ucla.edu	MSA 7149
Di Chen	dichen@atmos.ucla.edu
Seth Claudepierre	Associate researcher	sethclaudepierre [at] atmos.ucla.edu
Daniel Clements	Graduate Student	dclements [at] atmos.ucla.edu
Santo Fedele Colosimo	Assistant Researcher	fedele [at] atmos.ucla.edu
Sol Cooperdock	Project Scientist	cooperdock [at] atmos.ucla.edu
Jackson Darke	Graduate Student	jdarke40 [at] atmos.ucla.edu
Daniel Dauhajre	Postdoctoral Scholar	ddauhajre [at] atmos.ucla.edu
Xiuyuan Ding	Graduate Student	dingxy [at] atmos.ucla.edu
Charles Dong	Research Professor	cdong [at] atmos.ucla.edu
Rob Eagle	Assistant Professor	robeagle [at] g.ucla.edu
Annmarie Eldering	Adjunct Assistant Professor	eldering [at] atmos.ucla.edu
Todd Emmenegger	Graduate Student	temmen [at] atmos.ucla.edu
Robert Fovell	Professor Emeritus	fovell [at] atmos.ucla.edu	MSA 7162
Randall Friedl	Adjunct Professor
Alyson Fritzmann		afritzmann [at] ucla.edu
Rong Fu	Professor / vice Chair	rfu [at] atmos.ucla.edu	MSA 7173
Bowen Ge		gebowen [at] ucla.edu
Michael Ghil	Distinguished Research Professor	ghil [at] atmos.ucla.edu	MSA 7236
Geoff Girard	Chief Administrative Officer	girard [at] atmos.ucla.edu	MS 7133
Harold Gonzalez-Mejia	Academic Personnel Coordinator	hsgonzal [at] atmos.ucla.edu	MS 7127
Sara Graves		saragraves [at] ucla.edu
Yu Gu	Adjunct Professor	gu [at] atmos.ucla.edu	GE 2645B
Jerome Guiet		jguiet [at] atmos.ucla.edu
Alex Hall	Professor	alexhall [at] atmos.ucla.edu	MSA 7955
Larry Harding	Adjunct Professor	lharding [at] atmos.ucla.edu	SH 5853
Michael Heisel		heisel [at] ucla.edu
Paige Hoel	Graduate Student	paigehoel [at] atmos.ucla.edu
Calvin Howes	Graduate Student	calvinhowes [at] atmos.ucla.edu
Yue Huang	Graduate Student	yhuang [at] atmos.ucla.edu
Delphine Hypolite	Postdoctoral Scholar
Arjun Jagannathan	Postdoctoral Scholar
Sarah Johnson	Graduate Student	sjohnson [at] atmos.ucla.edu
Ning Kang		nkang20 [at] atmos.ucla.edu
Heejeong Kim	Assistant Researcher	heekim [at] atmos.ucla.edu	MS 7115
Jasper Kok	Associate Professor	jfkok [at] ucla.edu	MSA 7142
Dmitri Kondrashov	Researcher	dkondras [at] atmos.ucla.edu	MS 7232
Yi-Hung Kuo	Graduate Student	yhkuo [at] atmos.ucla.edu
Grace Leon	Contract and Grants Manager	gleon [at] atmos.ucla.edu	MS 7127
Danny Leung	Graduate Student	dannymleung [at] g.ucla.edu
Jeffrey Lew	Lecturer	lew [at] atmos.ucla.edu	MSA 1963
Jinxing Li	Assistant Researcher	jli [at] atmos.ucla.edu
Wen Li	Associate researcher	moonli [at] atmos.ucla.edu	MS 7984
Jiawen Li	Graduate Student	jiawen0110 [at] atmos.ucla.edu
Qinbin Li	Professor	qli [at] atmos.ucla.edu	MSA 7220
Kuo-Nan Liou	Distinguished Professor	knliou [at] atmos.ucla.edu	MSA 7163
Bessie Liu	Graduate Student	bessieliu [at] ucla.edu
Denise Lopez	Student Affairs Officer	dlopez [at] atmos.ucla.edu	MS 7127
Larry Lyons	Distinguished Professor	larry [at] atmos.ucla.edu	MSA 7138
Qianli Ma	Assistant Researcher	qianlima [at] atmos.ucla.edu
Weiming Ma	Graduate Student	mawei [at] atmos.ucla.edu
Donglai Ma	Graduate Student	dma96 [at] atmos.ucla.edu
Gavin Madakumbura	Graduate Student	gavindayanga [at] atmos.ucla.edu
Daniel McCoy	Graduate Student	demccoy [at] atmos.ucla.edu
Matthew McKinney	Graduate Student	mmckinney [at] atmos.ucla.edu
Diana McWilliams	Administrative Specialist	dmcw [at] atmos.ucla.edu	MSA 7983
Jim McWilliams	Louis B. Slichter Professor of Earth Sciences	jcm [at] atmos.ucla.edu	MSA 7983
C. Roberto Mechoso	Distinguished Research Professor Emeritus	mechoso [at] atmos.ucla.edu	MSA 7173
Jonathan Mitchell	Associate Professor	mitch [at] atmos.ucla.edu	GE 4684
Jeroen Molemaker	Associate researcher	nmolem [at] atmos.ucla.edu
Allison Moreno		allimoreno [at] atmos.ucla.edu
Jordyn Moscoso	Graduate Student	jmoscoso [at] atmos.ucla.edu
James Murakami	Staff Meteorologist	tenki [at] atmos.ucla.edu	MS 7101
J. David Neelin	Professor	neelin [at] atmos.ucla.edu	MSA 7969
Yukitoshi Nishimura	Associate researcher	toshi [at] atmos.ucla.edu	MS 7115
Jesse Norris	Project Scientist	jessenorris [at] ucla.edu	MS 7235
Paul Northrop	Assistant Development Engineer	paulnorth [at] atmos.ucla.edu	MS 7127
Caitlyn Ongjoco	Admistrative Specialist	congjoco [at] atmos.ucla.edu	MS 7127
Suzanne Paulson	Professor / Chair	paulson [at] atmos.ucla.edu	MSA 7157
Zoe Pierrat	Graduate Student	zpierra [at] atmos.ucla.edu
Olga Pikelnaya	Assistant Researcher	olga [at] atmos.ucla.edu
Mingxin Qu	Graduate Student	mingxin23 [at] atmos.ucla.edu
Katharine Reich	Administrative Specialist	kreich [at] ioes.ucla.edu	MS 7127
Lionel Renault	Assistant Researcher
De'Marcus Robinson	Graduate Student	demarcu1.robinson [at] atmos.ucla.edu
Rodrigo Rodakoviski	Graduate Student	rodakoviski [at] atmos.ucla.edu
Pablo Saide	Assistant Professor	saide [at] atmos.ucla.edu	MSA 7234
Ulli Seibt	Associate Professor	ulli [at] atmos.ucla.edu	MSA 7975
Jiaqi Shen	Graduate Student	jqshen [at] ucla.edu
Zhan Shi		zhanshi1997 [at] gmail.com
Clara Si	Graduate Student	csi [at] atmos.cula.edu
Kaushik Srinivasan	Assistant Researcher	kaushiks [at] ucla.edu
Andrew Stewart	Assistant Professor	astewart [at] atmos.ucla.edu	MSA 7162
Dominique Stumbaugh		NSTUMBAUGH07 [at] GMAIL.COM
Jochen Stutz	Professor	jochen [at] atmos.ucla.edu	MSA 7172
Hui Su	Adjunct Professor	Hui.Su [at] jpl.nasa.gov
Chad Thackeray	Postdoctoral Scholar
Tina Treude	Professor	ttreude [at] g.ucla.edu	SH 5859
Aradhna Tripati	Affiliated Associate Professor	ripple [at] zephyr.ess.ucla.edu	GE 2659
Katie Tuite	Graduate Student	ktuite [at] atmos.ucla.edu
Richard Turco	Distinguished Professor Emeritus	turco [at] atmos.ucla.edu	MSA 7157
Francis Turney	Graduate Student	fturney [at] ucla.edu
Duane Waliser	Adjunct Professor	duane.waliser [at] jpl.nasa.gov	MSA 7969
Chih-Ping Wang	Researcher	cat [at] atmos.ucla.edu	MS 7115
Peng Wang	Postdoctoral Scholar
Sarah Worden	Graduate Student
Yongkang Xue	Affiliated Professor	yxue [at] geog.ucla.edu	Bunche 1255
Chao Yan	Postdoctoral Scholar	yanchao11 [at] tsinghua.org.cn
Luwei Yang		luweiy [at] atmos.ucla.edu
Simon Yang	Assistant Project Scientist	yangsi [at] ucla.edu
Xinxin Ye	Postdoctoral Scholar
Kyongwon (Kevin) Yoo	Graduate Student	kyongwonyoo93 [at] atmos.ucla.edu
Chao Yue	Assistant Researcher	yuechao [at] atmos.ucla.edu
Henry Zapata	User Support Specialist	henryz [at] atmos.ucla.edu	MS 7101
Pengfei Zhang	Postdoctoral Scholar	zpengfei [at] atmos.ucla.edu
Siyu Zhao		siyu_zhao [at] atmos.ucla.edu
Ken Zhao	Graduate Student	kzhao [at] atmos.ucla.edu
Zewen Zheng	Graduate Student	zewenzheng [at] atmos.ucla.edu
Kuilin Zhu		kuilin [at] g.ucla.edu
Yizhou Zhuang		zhuangyz [at] atmos.ucla.edu

45°

Chance of Showers

Campus Address

Mailing Address

Contact Information

Campus Address	Mailing Address	Contact Information
520 Portola Plaza	UCLA Atmospheric & Oceanic Sciences	Students Services Office: (310) 825-1954
Math Sciences Building 7127	Box 951565	Email: studentinfo@atmos.ucla.edu
Los Angeles, CA 90095	Los Angeles, CA 90095-1565	Phone: (310) 825-1217