Identification

Title

ICARUS Chamber Experiment: Caltech Atmospheric Chamber_20150130_METHACROLEIN/Methyl nitrite/10102-44-0_Hydroxyl radical_Ammonium sulfate_RH40%

Abstract

Goals: This experiment was done to study the Methacrolein high NO2 photoxidation in the presence of wet ammonium sulfate (AS) seeds at RH 40%, since the other experiments were done at low RH and without seed particles. The hypothesis is that particle liquid water will decrease SOA formation because water will hydrolyze HMML instead of allowing it to oligomerize on the particle surface. This liquid water is also hypothesized to liberate 2-methylgycleric acid (2MGA) from the aerosol to the gas phase. Summary: Interestingly, gas-phase 2MGA is not significantly enhanced and aerosol mass is not significantly decreased in the 40% RH experiment (Exp. #12) compared to the dry experiments. It is possible that the liquid water content under these conditions (?30 vol%) is not high enough to dominate the reaction with HMML or there is a barrier to 2MGA volatilization. We do see the hypothesis confirmed in the fully deliquesced particle in the 85% RH experiment (150208) Organization: Caltech Atmospheric Chamber Lab Affiliation: California Institute of Technology, Pasadena, CA Chamber: Near/Far Bag 2012-2015 (Tran) Experiment Category: Gas phase chemical reaction, Aerosol formation Oxidant: Hydroxyl radical Reactants: METHACROLEIN, Methyl nitrite, 10102-44-0 Reaction Type: Photooxidation Relative Humidity: 40 Temperature: 25 Seed Name: Ammonium sulfate Pressure: 750 Torr

Resource type

dataset

Resource locator

https://gdex.ucar.edu/dataset/id/242f2a86-eb0a-4191-9f0f-e4aced70689f.html

protocol: https

applicationProfile: browser

name: ICARUS Chamber Experiment: Caltech Atmospheric Chamber_20150130_METHACROLEIN/Methyl nitrite/10102-44-0_Hydroxyl radical_Ammonium sulfate_RH40%

description: Metadata Link

function: download

Unique resource identifier

code

codeSpace

Dataset language

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

Keywords

Keyword set

keyword value

Dataset

originating controlled vocabulary

title

reference date

date type

revision

effective date

2014-10-16

Keyword set

keyword value

EARTH SCIENCE > ATMOSPHERE > AEROSOLS

EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > TRACE GASES/TRACE SPECIES

originating controlled vocabulary

title

reference date

date type

revision

effective date

2018-03-15

Keyword set

keyword value

In Situ/Laboratory Instruments > Chemical Meters/Analyzers

originating controlled vocabulary

title

reference date

date type

revision

effective date

2018-03-15

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

2015-01-30

End position

2015-01-30

Dataset reference date

date type

publication

effective date

2023-08-23

date type

modified

effective date

2023-08-23

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

Compressed Archive File (application/zip)

version of format

Constraints related to access and use

Constraint set

Use constraints

Creative Commons Attribution 4.0 International License.

Limitations on public access

These data are openly accessible by all registered users. Accounts are available free of charge following the registration of user information with a valid email address.

Responsible organisations

Responsible party

organisation name

Caltech Atmospheric Chamber

email address

wkong@caltech.edu

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

UCAR/NCAR - GDEX

email address

gdex@ucar.edu

responsible party role

pointOfContact

Metadata date

2023-08-23T02:25:51-06:00

Metadata language