Identification

Title

Numerical modeling of cloud chemistry effects on isocyanic acid (HNCO)

Abstract

Isocyanic acid (HNCO), a product of some combustion processes, can potentially have negative human health effects. While gas phase HNCO loss processes are slow, HNCO loss in the aqueous phase is much faster. The fate of HNCO is studied for different cloud chemistry conditions using a zero-dimensional chemical box model. Exposure to clouds reduces HNCO concentrations substantially under typical cumulus cloud conditions, resulting in the chemical lifetime of HNCO dropping to ~2 h compared to clear-sky conditions of several years. The effect of clouds on HNCO is strongly dependent on the pH and temperature, with more HNCO hydrolyzed at lower pH (more acidic drops) and higher temperatures. Thus, HNCO is most efficiently removed by fog or low-level stratus clouds and least efficiently removed under middle to upper troposphere conditions where cumulonimbus and pyrocumulus clouds reside. Deliquesced aerosols may be highly efficient at reducing HNCO concentrations.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d77h1kfq

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2013-08-16T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact