Identification

Title

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

Alternative title(s)

d789109

Abstract

<p>Goals:<br/> This experiment was done to study the Methacrolein high NO2 photooxidation 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.</p> <p>Summary:<br/> Interestingly, gas-phase 2MGA is not significantly enhanced and aerosol mass is not significantly decreased in the 40% RH experiment (Experiment #12) compared to the dry experiments. It is possible that the liquid water content under these conditions (30% by volume) 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)</p> <p>Organization: Caltech Atmospheric Chamber<br/> Lab Affiliation: California Institute of Technology, Pasadena, CA<br/> Chamber: Near/Far Bag 2012-2015 (Tran)</p> <p>Experiment Category: Gas phase chemical reaction, Aerosol formation<br/> Oxidant: Hydroxyl radical<br/> Reactants: METHACROLEIN, Methyl nitrite, 10102-44-0<br/> Reaction Type: Photooxidation<br/> Relative Humidity: 40<br/> Temperature: 25<br/> Seed Name: Ammonium sulfate<br/> Pressure: 750 Torr</p>

Resource type

dataset

Resource locator

https://gdex.ucar.edu/datasets/d789109/

protocol: https

name: Dataset Description

description: Related Link

function: information

https://gdex.ucar.edu/datasets/d789109/dataaccess/

protocol: https

name: Data Access

description: Related 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

environment

Keywords

Keyword set

keyword value

dataset

originating controlled vocabulary

title

reference date

date type

revision

effective date

2021-03-30

Keyword set

keyword value

LABORATORY > LABORATORY

originating controlled vocabulary

title

reference date

date type

revision

effective date

2025-10-03

Keyword set

keyword value

ICARUS > Integrated Chamber Atmospheric data Repository for Unified Science

originating controlled vocabulary

title

reference date

date type

revision

effective date

2025-10-03

Keyword set

keyword value

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

originating controlled vocabulary

title

reference date

date type

revision

effective date

2025-10-03

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

Frequency of update

notPlanned

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Creative Commons Attribution 4.0 International License

Limitations on public access

None

Responsible organisations

Responsible party

organisation name

email address

datahelp@ucar.edu

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

NSF NCAR Geoscience Data Exchange

email address

datahelp@ucar.edu

web address

https://gdex.ucar.edu

name: NSF NCAR Geoscience Data Exchange

description: The Geoscience Data Exchange (GDEX), managed by the Computational and Information Systems Laboratory (CISL) at NSF NCAR, contains a large collection of meteorological, atmospheric composition, and oceanographic observations, and operational and reanalysis model outputs, integrated with NSF NCAR High Performance Compute services to support atmospheric and geosciences research.

function: download

responsible party role

pointOfContact

Metadata date

2025-10-09T01:35:38Z

Metadata language