Cooperative Institute for Research in Environmental Sciences



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Atmospheric Chemistry Program Seminar

Atmospheric Chemistry Program Seminar

Measurements of Positive Ambient Ions as Part of HISCALE II Field Campaign by Aroob Abdelhamid, CU Boulder, ANYL 1st year

"Atmospheric ions control the electrical properties of the atmosphere, influence chemical composition via ion-molecule and/or ion-catalyzed reactions, and affect new particle formation. Understanding the role of ions in these processes requires knowledge of ionic chemical composition. Due to the low concentration of ions, chemical composition measurements have historically been challenging. Recent advances in mass spectrometry, such as the atmospheric pressure interface time-of- flight mass spectrometer (APi-TOF), are now making these measurements more feasible. Here, we present measurements of ambient cations during the HISCALE II field campaign (August- September 2016) in Lamont, OK. We discuss how the chemical composition of cations varies over the course of the campaign including before, during, and after new particle formation events. We specifically focus on the composition of organic nitrogen ions due to the potential importance of these compounds in atmospheric nucleation. We compare our results to measurements of neutral organic nitrogen compounds in order to gain insight into how organic nitrogen is chemically transformed in the atmosphere and how this influences new particle formation"

date

Monday, December 4, 2017
11:00am to 12:00pm

location

Ekeley S274

Event Type

Seminar

contact

Anne.Handschy@Colorado.EDU
2017-12-04
 
 
Cryospheric and Polar Processes Seminar

Cryospheric and Polar Processes Seminar

The glacier inventory and surge-type glacier study in China by Wanqin Guo, Associate Professor, Visiting Scholar from State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environmental and Resources, Chinese Academy of Science, Lanzhou, China.
 
Abstract:
 
The compilation of the first Chinese glacier inventory (CGI-1) was completely finished in 2002. It mainly used topographical maps made from aerial photographs taken during 1950s-1980s. The second Chinese glacier inventory (CGI-2) has been compiled since 2008 based on remote sensing and GIS techniques, and by using Landsat images acquired primarily during 2007-2010. Intensive manual work was involved to ensure the precise location of the glaciers' outlines. The first version of CGI-2 was formally released in 2014, and was then merged into the GLIMS database and the RGI dataset. The updates of the new version of CGI-2 (V2.0) come to an end this year. This version focused on the compilation of the latest glacier inventory of hte southeast Tibetan Plateau, where good quality satellite images can rarely be found during 2005-2011. Thus, glacier outlines of this region in CGI-2 V1.0 were replaced by a newly digitized CGI-1 dataset.
 
The frequent occurrences of glacier surge events and related glacial hazards in recent years have drawn a lot of attention. Many collaborative works have been done to study these glacier surge events, which reveal the stimulating impacts of climate change on the occurrences of such events. Anyemaqen Mountain is a key monitoring center on surge-type glaciers on the northeastern edge of Tibetan Plateau, with 10 surge-type glaciers (4 of them are in active phase right now). Another undergoing work is the detailed investigation of a surge-type glacier over high mountain Asia aimed at building their catalogue, and evaluate the probabilities of their recent surge as well as the possible disasters that may be induced.
 
To join by ZOOM: 
From a computer: https://cuboulder.zoom.us/j/5409618610
Or iPhone one-tap :
US: +16465588656,,5409618610#
Or Telephone, Dial(for higher quality, dial a number based on your current location):
US: 1-646-558-8656 
Meeting ID: 540 961 8610
International numbers available: https://cuboulder.zoom.us/zoomconference?m=n9ouFAK_Rco_IPQABq0Xs3hCfONRRvVt
 

date

Wednesday, December 6, 2017
11:00am to 12:00pm

location

East Campus, RL-2, Room 155

contact

Mistia.Zuckerman@colorado.edu
2017-12-06
 
ESOC Weekly Coffee

ESOC Weekly Coffee

ESOC Reading Room

date

Thursday, December 7, 2017
9:00am to 10:00am

location

ESOC Reading Room

contact

Ashley.Olson@colorado.edu
2017-12-07
 
 
 
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ESOC Weekly Coffee

ESOC Weekly Coffee

ESOC Reading Room

date

Thursday, December 14, 2017
9:00am

location

ESOC Reading Room

contact

Ashley.Olson@colorado.edu
2017-12-14
 
 
 
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ESOC Weekly Coffee

ESOC Weekly Coffee

ESOC Reading room

date

Thursday, December 21, 2017
9:00am to 10:00am

location

ESOC Reading Room

contact

Ashley.Olson@colorado.edu
2017-12-21
 
 
 
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